Diagnostic Manual, Diesel Engines,
Volume 1.1
Diagnosis - Table of Trouble Code Description
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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 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 intake manifold absolute pressure is registered by the pressure sensor (B28) and transmitted to the IFI control module.
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Supply voltage
Supply voltage
Signal voltage
Signal voltage
Engine rpm
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The IFI control module 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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Test step/Remedy
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 23
 6.0
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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 IFI control module checks the voltage present at the IAT sensor for the threshold values. If the threshold is exceeded, the IFI control module replaces it with a substitude value.
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Signal voltage
Signal voltage
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The IFI control module checks the voltage values:
> 4.7 V longer than 2 seconds
< 0.2 V longer than 2 seconds
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Test step/Remedy
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23
5.0
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3
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ECT sensor B11/4
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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 IFI control module checks after starting the engine when engine rpm is once > 1000 rpm and the coolant temperature is not > 35oC after 20 minutes, the ECT sensor is recognized as faulty.
The IFI control module checks the voltage present at the ECT sensor for the threshold values. If the threshold is exceeded, the IFI control module replaces it with a substitude value.
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Signal voltage
Signal voltage
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The IFI control module 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 the coolant temperature must be > 35oC after at least 20 minutes.
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Test step/Remedy
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23
4.0
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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 IFI control module checks the voltage present at the fuel temperature sensor for the threshold values. If the threshold is exceeded, the IFI control module replaces it with a substitude value.
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Signal voltage
Signal voltage
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The IFI control module checks the voltage values:
< 0.2 V longer than 2 seconds
> 4.7 V longer than 2 seconds
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Test step/Remedy
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23
23.0
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5
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EGR, vacuum control, intake manifold pressure
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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 logic chain EGR is checked, if the following conditions are met simultaneously:
 Engine rpm approx. 1900 - 2600 rpm and constant
Engine coolant temperature > 60 oC
A negative control deviation is present, if the control module calculates a lift of nominal = 2 mm but the EGR lifting sender (B28/3) reports a lift of actual = 4 mm to the IFI control module (N3/7).
Control deviation 2 mm.
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Signal voltage
Signal voltage
Control deviation positive
Control deviation negative
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The IFI control module checks the electrical connection and permanent control deviation:
> 5.2 V longer than 2 seconds
0 V longer than 2 seconds
> 2.5 mm longer than 4 seconds
< 1.5 mm longer than 4 seconds
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Test step/Remedy
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23
31.0
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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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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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Signal voltage
Signal voltage
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The IFI control module checks the voltage values:
> 4.7 V longer than 2 seconds
< 2.2 V longer than 2 seconds
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Test step/Remedy
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N3/7
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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 IFI control module checks the voltage values
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Test step/Remedy
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23
8.0
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8
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IFI 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 accelerator pedal position sensor is activated > 20%, the idle speed contact display must be OFF, see HHT actual values.
As of < 1% the idle speed contact in the accelerator pedal position sensor must be actuated.
If the accelerator pedal position sensor is not actuated, the display on the HHT must be 0%, see HHT actual values.
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Supply voltage
Supply voltage
Signal voltage
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The IFI control module 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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Test step/Remedy
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23
10.0
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9
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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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Control deviations between fuel rack position sensor and fuel quantity actuator
see nominal - actual value comparison
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Signal voltage
Signal voltage
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The IFI control module checks the signal voltage:
> 4.8 V longer than 320 ms
< 0.35 V longer than 120 ms
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Test step/Remedy
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23
9.0
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10
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CKP sensor 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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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 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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Test step/Remedy
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23
7.0
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11
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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 IFI control module 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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Test step/Remedy
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23
30.0
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12
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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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The IFI control module (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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Engine coolant temperature
Positive control deviation
Negative control deviation
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> 60 oC, Engine speed approx. 2500 rpm, control deviation > 6 seconds
> 210 mbar longer than 6 seconds
> 75 mbar longer than 6 seconds
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Test step/Remedy
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23
32.0
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13
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Resonance intake line switchover valve Y22/7
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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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The IFI control module checks the activation. If problems occur longer than approx. 2 seconds, the control module recognizes a fault.
Monitoring the final stage for short and open circuit.
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Test step/Remedy
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23
26.0
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14
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Resonance intake manifold switchover valve Y22/6
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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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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 IFI control module checks the activation. If problems occur longer than approx. 2 seconds, the control module recognizes a fault.
Monitoring the final stage for short and open circuit.
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Test step/Remedy
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23
27.0
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15
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Preglow system
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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 IFI control module checks if at engine speeds > 500 rpm the preglow indicator lamp goes out.
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Ignition:
ON
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The preglow indicator lamp must light up and go out after maximum preglow time or engine speed > 500 rpm.
Preglow indicator lamp must go out while cranking engine.
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Test step/Remedy
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24
1.0
-4.0
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16
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IFI control module 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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Internal check of control module for over/under voltage.
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 Control module fault, replace control module.
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Test step/Remedy
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N3/7
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17
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IFI control module 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 control module with ignition
ON
, a fault is present.
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Supply voltage
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11 - 14 V
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Test step/Remedy
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23
2.0
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18
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IFI 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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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 after engine is turned off
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Control module fault, replace control module.
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Test step/Remedy
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N3/7
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19
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IFI control module, 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 of the control module during operation and after engine is turned off.
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Control module fault, replace control module.
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Test step/Remedy
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23
8.0
+ 9.0
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20
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IFI control module supply voltage
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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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Supply voltage is checked for over/under voltage
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Supply voltage
Battery voltage
Battery voltage
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11 - 14 V
> 17.5 V longer than 5 seconds
< 8 V longer than 5 seconds
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Test step/Remedy
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23
1.0
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21
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IFI control module or not correctly coded
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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 ignition
ON
and after engine is turned off.
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check version coding, correct
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Test step/Remedy
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see HHT "version coding" menu point 5
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22
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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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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 of final stage and test when turning off engine
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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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Test step/Remedy
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23
22.0
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Printable version
