 |
 |
Test scope |
Test connection |
Test condition |
Nominal value |
Possible cause/Remedy |
| 1.0 |
    |
Engine control
module (IFI) (N3/7)
Voltage supply
Circuit 87 |
19 
18 |
|
 37
55
|
Ignition: ON |
11 - 14 V
11 - 14 V |
1.1 ,
Wiring/connectors,
Passenger side fuse and relay module box (K40/4),
2.0 ,
W16/5, W16/6
|
| 1.1 |
|
Power harness ground,
electronic |
N3/7
18
19 |
|
X12/3
X12/3
|
Ignition: OFF
X12/3 (Figure 2). |
11 - 14 V
11 - 14 V |
Power ground, electronic |
| 2.0 |
|
Passenger side fuse and relay module box (K40/4)
Voltage supply
Terminal 30 |
 |
K40/4
 |
C
1 |
Ignition: OFF
Disconnect connector C from the passenger side fuse and relay module box (K40/4),
(Figure 1 and 17).
|
11 - 14 V |
Fuses,
Wiring/connectors,
Passenger side fuse and relay module box (K40/4).
|
| 3.0 |
  |
Drive authorization signal |
|
|
|
Ignition: ON
(see Menu: Actual values, Drive authorization).
Start release:
Vehicle locked: |
Yes
No
|
N3/7: Version code wrong,
CAN bus,
16.0 ,
Electronic ignition-starter switch (EIS) control module (N73). |
| 4.0 |
|
Engine control module
(IFI) (N3/7)
Holding relay activation
Terminal HRL |
N3/7
26
|
|
X12/3
|
Ignition: Engine at CTP (idle)
Engine : Shut off |
11 - 14 V
11 - 14 V for approx. 4 sec. then < 1 V
|
Check voltage supply,
1.0 ,
Wiring/connectors,
Passenger side fuse and relay module box (K40/4),
2.0 ,
Engine control module (IFI) (N3/7).
|
| 5.0 |
|
ECT sensor (B11)
Voltage |
4 |
N3/7
|
23 |
Ignition: ON |
oC V
20 3.7
30 3.4
40 3.0
50 2.6
60 2.1
70 1.8
80 1.5
90 1.2
± 10%
|
5.1 ,
Wiring/connectors,
Engine control module (IFI) (N3/7).
|
| 5.1 |
|
Resistance |
4 |
N3/7
 |
23 |
Ignition: OFF
Disconnect connector on engine control module (IFI) (N3/7),
(Figure 1). |
oC 
20 2500
30 1700
40 2600
50 830
60 600
70 435
80 325
90 245
± 10%
|
5.2
Wiring/connectors.
|
| 5.2 |
|
B11 |
1  |
B11
|
2 |
Ignition: OFF
Disconnect connector on B11 (Figure 4).
|
Nominal values:
see 5.1 |
B11
|
| 6.0 |
|
IAT sensor (B17)
Voltage |
4 |
N3/7
|
40 |
Engine: at idle |
oC V
20 3.8
30 3.3
40 2.9
± 5%
|
6.1 ,
Engine control module (IFI) (N3/7).
|
| 6.1 |
|
Resistance |
4 |
N3/7
|
40 |
Ignition: OFF
Disconnect plug on engine control module (IFI) (N3/7),
(Figure 1). |
oC
20 6060
30 3900
40 2600
± 5%
|
6.2 ,
Wiring/connectors.
|
| 6.2 |
|
B17 |
2 |
B17
|
1 |
Ignition: OFF
Disconnect plug on
IAT sensor (B17),
(Figure 5).
|
Nominal values see 6.1 |
B17 |
| 7.0 |
|
Pressure sensor (B28)
Voltage |
4 |
N3/7
|
22 |
Accelerate briefly to
2,500 rpm. |
Voltage:
Rises
Pressure:
Rises
|
7.1 ,
Pressure lines,
B28 (Figure 6).
|
| 7.1 |
|
B28
Voltage supply |
4 |
N3/7
|
45 |
Ignition: ON
|
4.8 - 5.2 V
|
Wiring/connectors,
Engine control module (IFI) (N3/7).
|
| 8.0 |
|
CKP sensor (L5/6) |
28
28 |
|
20
20 |
Engine: at idle
Test via oscilloscope.
Testing with Hermann Datascope is only possible during the start or shut-down phase. With DACE tester, testing is possible during idle, during which the time axis must be set to 25ms and the voltage to 40 V AC .
Engine: at idle
Test with multimeter only if oscilloscope is not available.
Start rpm > 200rpm |
Signal
(Figure 7)
> 0.8 V ~
rising rpm equals
rising voltage
> 0.3 V ~
|
Installation position of CKP sensor (L5/6),
Dirt on L5/6 (metal chips),
Segments on flywheel,
8.1 |
| 8.1 |
|
Resistance of sensor L5/6 |
28 |
N3/7
|
20 |
Ignition: OFF
Remove connector on engine control module (IFI) (N3/7)
|
610 - 1300 |
Connector L5/6x1 (Figure 7),
Wiring/connectors,
CKP sensor (L5/6).
|
| 9.0 |
|
Fuel quanity
actuator (Y23/1)
Adjustment solenoid |
36
54 |
|
37
37 |
Ignition: ON
|
> 4.0 V max. for 30 seconds
with a clearly audible clicks
|
9.1 ,
Wiring/connectors,
Engine control module (IFI) (N3/7).
|
| 9.1 |
|
Resistance |
36
54 |
|
37
37 |
Ignition: OFF
Remove connector on IFI control module (N3/7). |
1.0 ± 1.4
1.0 ± 1.4
|
Wiring/connectors,
Fuel quantity actuator connector (Y23/1x1) (Figure 13),
Fuel quantity actuator (Y23/1).
|
| 10.0 |
|
Fuel rack position sensor (Y23/1l1) |
19 19 |
|
9
10
|
Ignition: ON
|
2.2 - 2.7 V
2.2 - 2.7 V |
10.1 ,
Wiring/connectors.
|
| 10.1 |
|
Resistance |
46 10 |
|
9
9 |
Ignition: OFF
Remove connector on engine control module (IFI) (N3/7) |
20 - 25
40 - 50
|
Wiring/connectors,
Connector Y23/1x1 (Figure 13),
Fuel quantity actuator (Y23/1). |
| 11.0 |
|
IFI/DFI accelerator pedal
position sensor (R25/2)
Nominal value poteniometer |
6
|
N3/7
|
39
|
Ignition: ON
CTP (idle) position:
Full load position: |
0.2 ± 0.5 V
3.7 ± 4.8 V |
Wiring/connectors,
IFI/DFI accelerator pedal
position sensor (R25/2) (Figure 9),
Engine control module (IFI) (N3/7). |
| |
|
Actual value poteniometer |
18
15
15 |
|
|
CTP (idle) position:
Full load position:
CTP (idle) position:
Full load position:
CTP (idle) position:
Full load position: |
> 4.5 V
<0.5 V
<0.5 V
> 4.5 V
<0.5 V
> 4.5 V
|
|
| 12.0 |
|
CC switch (S40)
CC switch (S40)
Safety contact
|
|
|
|
Ignition: ON
Menu: Cruise control actual values
Position: DECELERATE
Position: ACCELERATE
Position: RESUME
Position: OFF
Switch not actuated
CC Switch not actuated:
Position:
DECELERATE, ACCELERATE, RESUME, OFF:
|
D
A
R
O
(No display)
OFF
ON
|
Wiring/connectors,
Engine control module (IFI) (N3/7),
CC switch (S40),
Electronic ignition-starter switch (EIS) control module (N73).
|
| 13.0 |
 
|
Boost pressure control/pressure control flap vacuum transducer (Y31/5)
Test connections:
Connect vacum/pressure tester with Y- fitting, between Y31/5 "OUT" outlet and boost pressure control valve. Intake manifold pressure can be observed as well using the HHT.
|
53 |
N3/7
|
37 |
Check vacuum at Y31/5 "OUT" outlet (Figures 8 and 10) Engine: at CTP (idle)
Accelerate briefly from 1,500 rpm to 3,500 rpm: |
> 4.0 V
>350 mbar
< 3 V
< 400 mbar
Intake manifold pressure rises.
|
 31 /1,
Vent filter dirty (Figure 12),
Vacuum lines,
Vacuum supply 13.2 ,
Wiring. |
| 13.1 |
|
Current draw |
18 |
N3/7
 |
53 |
Ignition: ON
|
0.8 - 1.2 A
|
Wiring/connectors,
Y31/5 (Figure 2). |
| 13.2 |
|
Vacuum supply
Test connections:
Connect vacum/pressure tester with Y- fitting between vacuum supply lines.
|
|
|
|
Engine: At CTP (idle)
|
>700 mbar |
Vacuum lines,
Vacuum pump. |
| 14.0 |
|
IFI electrohydraulic shut-off actuator (Y1/1)
Activation |
18 |
N3/7
|
43 |
Engine: at CTP (idle)
|
11 - 14 V |
14.1 ,
Wiring/connectors, |
| 14.1 |
|
Current draw |
N3/7
18 |
|
X12/3
|
Ignition: OFF
Disconnect connector at N3/7,
X12/3 (Figure 2).
|
1.4 - 1.6 A
Y1/1 clicks audibly.
|
Y31/1 (Figure 11).
|
| 14.2 |
|
Resistance |
2
|
Y1/1y1
|
3 |
Ignition: OFF
Disconnect connector at Y1/1
|
7.6 - 8.6
|
Y1/1
|
| 15.0 |
 |
Fuel temperature
sensor (Y1/1b1)
|
4 |
N3/7
|
40 |
Ignition: ON |
oC V
20 3.9
30 3.5
40 3.0
50 2.6
|
15.1 ,
Engine control module (IFI) (N3/7).
|
| 15.1 |
|
Resistance of Y1/1b1 |
4 |
N3/7
|
3 |
Ignition: OFF
Disconnect plug on engine control module (IFI) (N3/7),
(Figure 1). |
oC
20 2500
30 1700
40 1170
50 830
|
15.2 ,
Wiring/connectors.
|
| 15.2 |
|
Y1/1b1 |
1 |
Y1/1b1
|
4 |
Ignition: OFF
Remove connector at fuel temperature sensor (Y1/1)
|
Actual values
see 15.1
|
Fuel temperature sensor (Y1/1b1),
Replace IFI electrohydraulic shut-off actuator (Y1/1).
|
| 16.0 |
|
CAN-Data bus
Wiring resistance |
41 |
N3/7
|
5 |
Ignition: OFF |
58 - 62 |
Wiring/connectors,
X25/7,
CAN-bus,
DAS control module (N54/1),
Engine control module (IFI) (N3/7).
|
| 17.0 |
|
P/N signal from ETC control module (N15/3)
|
18 |
N3/7
|
27 |
Ignition: ON
Gear selector lever in position: P or N
YES
NO |
<0.5 V
> 9.0 V |
Wirng,
Ground, (electronics, right
footwell) (W15/1),
ETC control module (N15/3). |
| 18.0 |
|
Stop lamp switch (S9/1) |
|
|
|
Ignition: ON
Brake pedal position via CAN (Select actual values tests, engine tests,
page 3):
Brake pedal depressed:
Brake pedal released:
|
ON
OFF |
18.1
Wiring,
CAN-Bus
|
| 18.1 |
|
Resistance |
1
|
S9/1
|
4
|
Ignition: OFF
Disconnect stop lamp switch connector (S9/1x1):
Brake pedal depressed:
Brake pedal released:
|
< 1
>100 k
|
Stop lamp switch (S9/1),
(Figure 14).
|
| 19.0 |
|
Preglow control
Communication wire between engine control module (IFI) (N3/7) and preglow control module (N14/2)
Resistance
|
N3/7
33
|
|
N14/2x1
2
|
Ignition: OFF
Remove connector (N14/2x1) from preglow control module (N14/2) (Figures 1, 2 and 3),
Remove engine control module (IFI) (N3/7).
|
< 1 |
Wiring,
Preglow control module (N14/2). |
| 20.0 |
|
Preglow control module (N14/2)
Voltage supply
Circuit 30
|
|
|
N14/2x3
|
Ignition: OFF
|
11 - 14 V
|
20.1 ,
Preglow control module (N14/2)
(Figure 2). |
| 20.1 |
|
Ground, electronics output ground - right footwell (W15) |
|
|
N14/2x1
1 |
Ignition: OFF
Remove connector (N14/2x1) from preglow control module (N14/2) (Figure 3).
|
< 1 |
Ground (electronics output
ground - right footwell) (W15),
Wiring/connectors. |
| 21.0 |
|
Glow plug failure
Glow plug and harness test |
|
|
N14/2x2
1
(2.1)
2
(2.2)
3
(2.3)
4
(2.4)
5
(2.5)
6
(2.6)
|
Measure with DC current pickup.
Remove windshield washer reservoir, remove cable cover, loosen cable ties, pull back protective sleeve from cable,
for each measurement turn ignition key again to position 2. |
8 - 25 A
The current draw is dependent on the coolant temperature. |
Glow plugs,
Wiring,
Preglow output (N14/2). |
| 22.0 |
|
Test step for NON-USA vehicles only |
|
|
|
|
|
|
| 23.0 |
|
Circuit 15E |
18
|
N3/7
|
47
|
Ignition: ON
|
11 - 14 V
|
Voltage supply, see
1.0 ,
Wiring/connectors,
Electronic ignition-starter switch (EIS) control module (N73),
Passenger-side fuse and relay module box (K40/4) (Figure 1),
Starter relay (K40/4k2),
(Figure 17).
|
| 24.0 |
|
EGR valve pressure transducer (Y31/1)
|
|
|
|
Engine: at idle
Pressure regulation
(see Menu: Actual values, Engine test, page 3)
>1000 rpm
Accelerate briefly to 3,300 rpm: |
ON
OFF |
24.1 ,
Vent filter dirty (Figure 12),
Pressure lines,
Pressure supply, see 13.0 ,
Wiring,
EGR valve pressure transducer (Y31/1),
24.2
|
| 24.1 |
|
Current draw |
18 |
N3/7
|
35 |
Ignition: ON
|
0.8 - 1.2 A |
Wiring/connectors,
EGR valve pressure transducer (Y31/1) (Figure 11).
|
| 24.2 |
|
EGR valve
leak test |
|
|
|
Ignition: OFF
Remove vacuum line and connect pressure/vacuum tester, apply 400mbar to EGR valve
|
EGR valve closes audibly. |
EGR valve
|
| 25.0 |
|
EGR lifting sender (B28/3)
|
4 |
N3/7
|
21 |
Engine: at idle
at 2000 rpm |
< 1.5 V
> 3.0 V
|
25.1 ,
see 31 /1, (Figure 1). |
| 25.1 |
|
EGR lifting sender (B28/3)
Voltage supply |
4 |
N3/7
|
24 |
|
4.8 - 5.2 V |
Separation point (X35/63),
Wiring/connectors |
| 26.0 |
|
Hot film MAF sensor (B2/5)
Voltage from Hot Film |
|
|
|
Run engine btween 1,200 amd 2,500 rpm to check air mass
(see Menu: Actual values, Engine test, page 5)
|
Actual/nominal values comparison |
Unmetered air leak,
Wiring/connectors,
(B2/5), (see Figure 16). |
| 27.0 |
|
Starter control
Activate starter
relay (K40/4k2) |
17 |
N3/7
|
55
|
Engine: Start |
> 9.0 V,
During the start procedure. |
27.1 ,
Wiring/connectors,
Starter relay
(K40/4k2) (Figure 17),
Passenger-side fuse and relay module box (K40/4) (Figure 1),
Engine control module (IFI) (N3/7).
|
| 27.1 |
|
Circuit 50 of
Electronic ignition-starter switch (EIS) control module (N73) |
13 |
N3/7
|
55 |
Engine: Start |
< 1.0 V,
During the start procedure. |
Wiring/connectors,
Driver-side fuse and relay module box (K40/2),
Electronic ignition-starter switch (EIS) control module (N73),
Engine control module (IFI) (N3/7).
|
Printable version
