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1
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Pressure sensor (B28)
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System trouble code
OBD trouble code
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Storage of DTC and activation of
CHECK ENGINE MIL
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Immediately upon fault recognition
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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The intake manifold absolute pressure is registered by the pressure sensor (B28) and transmitted to the engine control module (IFI) (N3/7)
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Supply voltage
Supply voltage
Signal voltage
Signal voltage
Engine rpm
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The engine control module (IFI) checks the voltage values:
< 4.7 V longer than 2 seconds
> 5.0 V longer than 2 seconds
> 4.6 V longer than 2 seconds
< 0.4 V longer than 2 seconds
< 800 rpm and the difference between Intake manifold pressure - atmospheric pressure > 210 mbar longer than 6 seconds
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2
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IAT sensor (B17)
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System trouble code
OBD trouble code
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Storage of DTC and activation of
CHECK ENGINE MIL
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Two consecutive trips with fault
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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The engine control module (IFI) (N3/7) checks the voltage present at the IAT sensor for the threshold values. If the threshold is exceeded, the engine control module (IFI) replaces it with a substitude value.
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Signal voltage
Signal voltage
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The engine control module (IFI) checks the voltage values:
> 4.7 V longer than 2 seconds
< 0.2 V longer than 2 seconds
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3
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ECT sensor (B11)
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System trouble code
OBD trouble code
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Storage of DTC and activation of
CHECK ENGINE MIL
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Two consecutive trips with fault
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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After ignition:
ON,
a timing sequence starts in the engine control module. This time is at
Engine coolant temperature > 10oC 2 minutes
Engine coolant temperature -7oC 5 minutes
The internal timing sequence in the engine control module is interrupted if the engine speed is < 1000 rpm and the injection quantity is < 15 mg/stroke.
If the internal timing sequence is completed and the coolant temperature, since ignition
ON
, did not increase by at least 5oC or to 40oC, the ECT sensor (B11) is recognized as defective.
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Signal voltage
Signal voltage
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The engine control module (IFI) checks the voltage values:
< 0.2 V longer than 500 ms
>4.7 V longer than 500 ms
As of an engine speed > 1000 rpm and an injection quantity > 15 mg/stroke the coolant temperature must have increased after 2 - 5 minutes (depending on the coolant temperature at ignition ON) by at least 5oC or risen to > 40oC or a fault is entered into the DTC memory.
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4
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Fuel temperature sensor (Y1/1b1)
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System trouble code
OBD trouble code
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Storage of DTC and activation of
CHECK ENGINE MIL
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Two consecutive trips with fault
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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The engine control module (IFI) (N3/7) checks the voltage present at the fuel temperature sensor for the threshold values. If the threshold is exceeded, the engine control module (IFI) replaces it with a substitude value.
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Signal voltage
Signal voltage
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The engine control module (IFI) checks the voltage values:
< 0.2 V longer than 2 seconds
> 4.7 V longer than 2 seconds
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5
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CAN data bus
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System trouble code
OBD trouble code
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Storage of DTC and activation of
CHECK ENGINE MIL
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Two consecutive trips with fault
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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The instrument cluster (A1) transmits data to the engine control module(IFI) (N3/7) in a certain time cycle. The instrument cluster (A1) is recognized as defective, if these data are missing for longer than 1 second.
The CAN internal resistance in the engine control module (IFI) is monitored during operation.
Further more, the CAN element in the engine control module (IFI) is monitored.
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6
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Atmospheric pressure sensor in control module
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System trouble code
OBD trouble code
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Storage of DTC and activation of
CHECK ENGINE MIL
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Two consecutive trips with fault
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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Signal voltage
Signal voltage
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The engine control module (IFI) (N3/7) checks the voltage values:
> 4.7 V longer than 2 seconds
< 2.2 V longer than 2 seconds
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7
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Fuel quantity actuator (Y23/1)
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System trouble code
OBD trouble code
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Storage of DTC and activation of
CHECK ENGINE MIL
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Immediately after occurrence of fault
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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Control deviation between fuel rack position sensor and fuel quantity actuator
see nominal - actual value comparison
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The engine control module (IFI) (N3/7) checks the voltage values
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8
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CAN communication, ETC or ETS interrupted
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System trouble code
OBD trouble code
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Storage of DTC and activation of
CHECK ENGINE MIL
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Two consecutive trips with fault
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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The CAN communication from the transmission control module and the ETS/SPS control module is checked for existance and plausibility.
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9
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IFI/DFI accelerator pedal position sensor (R25/2)
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System trouble code
OBD trouble code
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Storage of DTC and activation of
CHECK ENGINE MIL
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Immediately after occurrence of fault
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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Checking the supply voltage.
If the IFI/DFI accelerator pedal position sensor (R25/2) is activated > 20%, the idle speed contact display must be OFF, see HHT actual values.
As of < 1% the idle speed contact in the IFI/DFI accelerator pedal position sensor must be actuated.
If the IFI/DFI accelerator pedal position sensor is not actuated, the display on the HHT must be 0%, see HHT actual values.
Note:
During the test it should be observed, that the EGR lifting sender (B28/3) and the IFI/DFI accelerator pedal position sensor (R25/2) receive the same supply voltage. Therefore, both parts should be tested.
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Supply voltage
Supply voltage
Signal voltage
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The engine control module(IFI) (N3/7) checks the voltage values:
> 5 V longer than 2 seconds
< 4.7 V longer than 2 seconds
> 4.7 V longer than 240 ms
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10
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Fuel rack position sensor (Y23/1l1)
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System trouble code
OBD trouble code
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Storage of DTC and activation of
CHECK ENGINE MIL
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Immediately after occurrence of fault
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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Checked signal or condition
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The engine control module (IFI) (N3/7) monitors the signal voltage and also monitors if the start and stop rest "stops" are reached, while the control module is in the after run mode.
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11
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CKP sensor (IFI/DFI) (L5/6)
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System trouble code
OBD trouble code
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Storage of DTC and activation of
CHECK ENGINE MIL
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Two consecutive trips with fault
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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Checking for dynamic plausibility, e.g. the time from one impulse to the next must not deviate by a specified time
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Engine is shut off
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12
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EGR lifting sender (B28/3)
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System trouble code
OBD trouble code
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Storage of DTC and activation of
CHECK ENGINE MIL
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Immediately after occurrence of fault
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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Monitoring of supply and signal voltage
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Signal voltage
Supply voltage
Supply voltage
Signal voltage, ignition
ON
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The engine control module (IFI) (N3/7) checks the voltage values:
> 4.7 V longer than 2 seconds
> 5 V longer than 2 seconds
<4.7 V longer than 2 seconds
>1.3 V longer than 2 seconds
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13
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EGR valve pressure tranducer (Y31/1)
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System trouble code
OBD trouble code
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Storage of DTC and activation of
CHECK ENGINE MIL
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Immediately after occurrence of fault
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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Positive or negative control deviation.
Positive control deviation
The desired value from the engine control module (IFI) (N3/7) (nominal value) was for an extended period of time (4 seconds) by more than 2.5 mm
below
specification.
Negative control deviation
The desired value from the engine control module (IFI) (N3/7) (nominal value) was for an extended period of time (4 seconds) was
exceeded
by more than 1.5 mm .
Explanation for control deviation: Nominal value
minus
actual value.
Short circuit or end stage idling.
Flow check
The following sequence is performed during the flow check:
- EGR valve closed
- Pressure control flap closed
- With the pressure control flap and the EGR valve closed, the intake manifold pressure is measured.
- EGR valve opened
- With the pressure control flap closed and the EGR valve opened the intake manifold pressure is measured.
- The difference between closed and opened EGR valve must be > 10 mbar otherwise a failure is set in the DTC memory.
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14
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Pressure control flap vacuum transducer (Y31/2)
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System trouble code
OBD trouble code
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Storage of DTC and activation of
CHECK ENGINE MIL
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Immediately after occurrence of fault
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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Nominal - actual value comparison
The engine control module (IFI) (N3/7) checks the electrical wiring and for permanent control deviations.
Monitoring for positive or negative control deviations.
Monitoring the final stage for short and open circuit.
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Positive control deviation
Negative control deviation
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Positive or negative control deviation.
Positive control deviation
The desired value from the IFI control module (nominal value) was for an extended period of time (6 seconds) by more than 210 mbar
below
specification.
Negative control deviation
The desired value from the IFI control module (nominal value) was for an extended period of time (6 seconds) was
exceeded
by more than 75 mbar.
Explanation for control deviation: Nominal value
minus
actual value.
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15
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Shifting induction pipe switchover valve (Y22/6)/resonance intake manifold flap
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System trouble code
OBD trouble code
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Storage of DTC and activation of
CHECK ENGINE MIL
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Two consecutive trips with fault
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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If the shifting induction pipe switchover valve Y22/6
is energized
, then this means that: the resonance intake manifold flap 99/4 is
not supplied
with vacuum and the resonance intake line switch (S35/1)
is not actuated
.
If the shifting induction pipe switchover valve Y22/6
is not energized
, then this means that: the resonance intake manifold flap 99/4
is supplied
with vacuum and the resonance intake line switch (S35/1)
is actuated
.
The engine control module (IFI) (N3/7) checks the activation. The engine control module (IFI) (N3/7) recognizes a failure, if the problems exist longer than approx. 2 seconds.
The monitoring of the switches takes place at an engine speed > 1000 rpm.
Monitoring the final stage for short and open circuit.
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16
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Resonance intake line switchover valve (Y22/7)/resonance intake line flap
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System trouble code
OBD trouble code
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Storage of DTC and activation of
CHECK ENGINE MIL
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Two consecutive trips with fault
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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If the switchover valve Y22/7
is energized
, then this means that: the resonance intake line flap 99/2 is
not supplied
with vacuum and the resonance intake line switch (S35/1)
is not actuated
.
If the switchover valve Y22/7
is not energized
, then this means that: the resonance intake line flap 99/2
is supplied
with vacuum and the resonance intake line switch S35/1
is actuated
.
The engine control module (IFI) (N3/7) checks the activation. The engine control module (IFI) (N3/7) recognizes a failure if the problems exist longer than approx. 2 seconds.
The monitoring of the switches takes place at an engine speed > 1000 rpm.
Monitoring the final stage for short and open circuit.
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17
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Preglow control
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System trouble code
OBD trouble code
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Storage of DTC and activation of
CHECK ENGINE MIL
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Immediately after occurrence of fault
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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The function of the preglow indicator lamp is checked.
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Ignition:
ON
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18
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Glow plug failure, cylinder 1 - 2
Glow plug failure, cylinder 3 - 4
Glow plug failure, cylinder 5 - 6
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System trouble code
OBD trouble code
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Storage of DTC and activation of
CHECK ENGINE MIL
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Two consecutive trips with fault
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Monitoring time and frequency of test
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During the preglow procedure
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Checked signal or condition
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Ignition:
ON
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| >
19
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Preglow control module (N14/2)
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System trouble code
OBD trouble code
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Storage of DTC and activation of
CHECK ENGINE MIL
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Two consecutive trips with fault
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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Ignition:
ON
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| >
20
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Voltage supply missing or relay module (K40)
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System trouble code
OBD trouble code
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Storage of DTC and activation of
CHECK ENGINE MIL
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Immediately after occurrence of fault
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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Ignition:
ON
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| >
21
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Engine control module (IFI) (N3/7)
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System trouble code
OBD trouble code
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Storage of DTC and activation of
CHECK ENGINE MIL
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Immediately after occurrence of fault
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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With code:
: Internal check of engine control module (IFI) (N3/7) for under/over voltage
With code:
: Internal check of engine control module (IFI) (N3/7) for after run
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 Control module fault: replace engine control module (IFI) (N3/7)
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| >
22
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Engine control module (IFI) (N3/7), circuit 15
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System trouble code
OBD trouble code
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Storage of DTC and activation of
CHECK ENGINE MIL
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Immediately after occurrence of fault
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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If no voltage supply via circuit 15 is supplied to the engine control module (IFI (N3/7) with ignition
ON
,
a fault is present.
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Supply voltage
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11 - 14 V
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23
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Engine control module (IFI) (N3/7) fuel metering actuator or fuel rack position sensor
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System trouble code
OBD trouble code
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Storage of DTC and activation of
CHECK ENGINE MIL
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Immediately after occurrence of fault
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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Internal check in control module during operation and after engine shut-off
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Engine control module or injection pump fault (based on fault type), be certain to check supplied fault code data (HHT freeze frame) as well
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24
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Engine control module (IFI) (N3/7) or not properly version coded
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System trouble code
OBD trouble code
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|
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Storage of DTC and activation of
CHECK ENGINE MIL
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Immediately after occurrence of fault
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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With ignition
ON
and during after running
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Check version coding and correct
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| >
25
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IFI electrohydraulic shut-off actuator (Y1/1)
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System trouble code
OBD trouble code
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|
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Storage of DTC and activation of
CHECK ENGINE MIL
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Immediately after occurrence of fault
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Monitoring time and frequency of test
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Continuously
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Checked signal or condition
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The final stage of the electrohydraulic shut-off actuator is checked for short circuit. In addition, a plausibility check is performed during engine control module after run:
Prerequisite Engine speed < 800 rpm
Vehicle speed < 3 km/h
During the electrohydraulic shut-off actuator test, the actuator is deenergized and the engine speed is monitored. If the engine speed does not drop below 500 rpm within 2 seconds a IFI electrohydraulic shut-off actuator (Y1/1) failure is recognized and the engine is turned off via the fuel metering
actuator (Y23/1k1).
Increases the engine speed to > 1300 rpm or by more than 740 rpm during the electrohydraulic shut-off actuator test, a shut-off actuator failure (Y1/1) is recognized also and the engine is turned off via the fuel metering actuator.(Y23/1k1).
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Signal voltage
Signal voltage
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The engine speed must drop within 2 seconds < 500 rpm after turning off engine.
Short circuit of electrohydraulic actuator against battery +
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Printable version
