 |
Mode |
Test scope |
Test connection |
Test condition |
Nominal value |
Possible cause/Remedy |
| 1.0 |
|
Instrument cluster (A1)
Voltage supply
circuit 30
|
11  (2) |
A1
 |
 12
(2) |
Remove A1,
Disconnect connector 2 |
11 - 14 V |
Wiring,
1.1 |
| 1.1 |
|
Voltage supply
Circuit 15, unfused |
10 (1) |
A1
|
1
(1) |
Remove A1,
Disconnect connector 1
Ignition: ON
|
11 - 14 V |
Wiring,
1.2 |
| 1.2 |
|
Voltage supply
Circuit 15, fused |
10
(1) |
A1
|
5
(1) |
Remove A1,
Disconnect connector 1
Ignition: ON
|
11 - 14 V |
Wiring,
Values OK:
A1 |
| 2.0 |
|
Instrument cluster (A1)
Illumination |
10
(1) |
A1
|
8
(1) |
Remove A1,
Disconnect connector 1
Ignition: ON
Turn on parking lights.
|
11 - 14 V |
Wiring,
Exterior lamp switch (S1),
Short circuit in circuit 58d (output from A1). |
| 3.0 |
1 |
Fuel level gauge (A1p2) |
|
|
|
Activate test mode 1
(see Figure 1).
|
Analog fuel gauge reading  digital readout |
A1,
3.1 |
| 3.1 |
6 - 9 |
Fuel level gauge (A1p2) |
|
|
|
Activate test modes 6 - 9
|
see Figures
2 - 9
|
A1,
3.2 |
| 3.2 |
|
Wires and connections or fuel level sensor (B4) |
1 |
B4
 |
2
|
Ignition: OFF
Disconnect connector at B4.
Connect resistance substitution unit.
Ignition: ON
Resistance substitution unit setting:
87 ± 2 
77 ± 1
68 ±3
48 ±3
27 ±3
7 ±2
Note:
Before changing each resistance value, the ignition must be turned off and then turned on again. |
Display in
A1p2:
0 1)
Res. 1)
1/4
1/2
3/4
1/1 |
Wiring,
Values OK:
B4 |
| 3.3 |
1 |
Programming fuel tank version in trip odometer |
|
|
|
Ignition: ON
Activate test mode 1 |
  = Standard fuel tank
 =Fuel tank with pass-through (non-U.S.)
|
Set fuel tank version to by depressing reset button for trip odometer. |
| 4.0 |
2 |
Fuel consumption
indicator (A1p10) |
|
|
|
Engine: at Idle
Activate test mode 2
Increase engine rpm |
With increasing rpm, the consumption in l/h increases.
Note:
The readout is only visible on the digital display.
The analog reading
shows 0.
|
4.1 |
| 4.1 |
6 - 8 |
A1p10 |
|
|
|
Activate test modes 6 - 8
|
see Figures
2 - 9 |
A1,
4.2 |
| 4.2 |
2 |
Fuel consumption signal from LH-SFI control module (N3/1 or N3/3) or HFM-SFI engine control module (N3/4) or EDS control module (N39)
|
LH-SFI
N16/1
13
(1)
W3/3
HFM-SFI
N3/4
18
(1)
W3/3
EDS
N16/1
13
(1)
W3/3 |
|
N3/1
or
N3/3
9
(1)
N3/1
or
N3/3
9
(1)
N3/4
7
(1)
N3/4
7
(1)
N39
13
(1)
N39
13
(1)
|
Ignition: OFF
Disconnect N3/1, N3/3, N3/4 or N39 (Figures 10, 11,15 and 16); for LH-SFI
and EDS: remove N16/1.
Connect signal generator (Figures 18, 19) and set to a voltage amplitude of
approx. 10 V.
Activate test mode 2.
Connect wire for rpm signal as follows:
LH-SFI
First bridge N16/1 socket 13 to N3/1 or N3/3 socket 9, then connect to signal generator (Figure 19).
HFM-SFI
First bridge N3/4 socket 18 to N3/4 socket 7 (Figure 16) then connect to signal generator.
EDS
First bridge N16/1 socket 13 to N39 socket 13 then connect to signal generator (Figure 18).
Ignition: ON
|
LH-SFI/
HFM-SFI
25 Hz 5
50 Hz 10
75 Hz 15
100 Hz 20
EDS
850 Hz 85
900 Hz 90
950 Hz 95
1000 Hz 100
Note:
The readout is only visible on the digital display.
The analog reading
shows 0. |
Wiring,
A1,
Values OK: N3/1, N3/3, N3/4, N16/1 (for LH-SFI or EDS) or N39
Engines, Volume 2 - 1.1 >23 or
- 3.1 >23 or
- 3.2 >23
Note:
If no plausible values are indicated while driving and the speedometer is in order: Check instrument cluster (A1)
|
| 5.0 |
3 |
Engine oil pressure
gauge (A1p3) |
|
|
|
Engine: at Idle
Activate test mode 3.
Increase engine rpm |
Analog reading digital readout.
The oil pressure increases with increasing engine rpm.
|
A1,
5.1 |
| 5.1 |
6 - 7 |
Oil pressure gauge (A1p3) |
|
|
|
Activate test modes 6 - 7
|
see Figures
2 - 9
|
A1,
5.2 |
| 5.2 |
|
Wires and connections or oil pressure sensor (B5) |
1 |
B5
|
2
|
Ignition: OFF
Disconnect connector at B5.
Connect resistance substitution unit.
Engine: at Idle
Resistance substitution unit setting:
13
40
90
150 |
Display in
A1p3:
0
1
2
3 |
Wiring,
A1,
Values OK: check oil pressure (see SMS Engine, Mechanical),
B5 |
| 6.0 |
4 |
Tachometer (A1p5) |
|
|
|
Engine: at Idle
Activate test mode 4, increase engine rpm |
Analog tachometer reading digital readout |
A1,
6.1 |
| 6.1 |
|
Tachometer (A1p5)
with LH-SFI or EDS:
with HFM-SFI: |
W3/3
W3/3 |
|
N16/1
13
N3/4
18
(1)
|
Disconnect plug on N16/1 or N3/4 (Figures 10, 11, 15 and 16).
Connect signal generator and set to a voltage amplitude of approx. 10 V (Figure 17).
Ignition: ON
|
Engine 104, 120
Readout:
50 Hz
1000 rpm
194 Hz
4000 rpm
Engine 119
Readout:
70 Hz
1000 rpm
270 Hz
4000 rpm
Engine 603
Readout:
2400 Hz
1000 rpm
9600 Hz
4000 rpm |
Wiring,
A1,
Values OK on LH-SFI or EDS engine: N16/1
D.M., Chassis and Drivetrain,
Volume 1 - 1.1 >23
Values OK on HFM-SFI engine: N3/4 |
| 7.0 |
5 |
Low engine oil level
indicator lamp (A1e12) |
|
|
|
Oil level correct.
Engine: at Idle
Activate test mode 5.
Refer to section  11
Readout in odometer: |
Digital readout:
   indicator lamp: OFF
Oil level OK
 indicator lamp: ON
Oil level not OK
|
Wiring,
Oil level switch (S43). |
| 8.0 |
|
Electronic speedo-
meter (A1p8)
Vehicles with ASR/SPS or ETS/SPS as of 06/94:
Left front axle VSS sensor (L6/1) connected to ASR/SPS or ETS/SPS control module (N47-1 or N47-2).
See D.M., Chassis and Drivetrain, Vol. 3, 9.1 23 |
ABS
W3/3
ABS/
ASR
W3/3
ASR/
SPS
or
ETS/
SPS
W3/3 |
|
N30
3
(1)
N30/1
36
(1)
N47-1
N47-2
|
Remove N30 or N30/1, N47-1 or N47-2 (Figure 10, 11 or 15).
Connect signal generator and set to a voltage amplitude of approx. 10 V (Figure 17).
Ignition: ON |
With increasing frequency the speed value on the speedometer increases. |
Wiring,
A1
Values OK: N30 or N30/1,
D.M., Chassis and Drivetrain,
Volume 2 - 5.2 >23 or
6.2 >23 .
N47-1 or N47-2,
D.M., Chassis and Drivetrain,
Volume 3 - 9.1 >23 |
| 9.0 |
|
Outside temperature
display (A1p4) |
9 |
X24
|
10
|
Disconnect 2-pole headlamp harness connector connector X24 ( Figure 12).
Connect resistance substitution unit.
Ignition: ON
Resistance substitution unit setting:
53 k
9.8 k
1 k
|
Display in
A1p4:
- 30 °C
0 °C
+ 50 °C |
Wiring,
A1,
9.1 |
| 9.1 |
6 |
Outside temperature indicator temperature sensor (B14) |
|
|
|
Ignition: ON
Activate test mode 6.
53 k
9.8 k
3.7 k
1.6 k |
Readout in odometer:
- 30 °C
0 °C
20 °C
40 °C |
B14 |
| 10.0 |
|
ECT gauge (A1p1) |
Gaso-line
engine
W11
Diesel
engine
W11 |
|
B13
B13
|
Disconnect plug on ECT gauge sensor (B13).
Connect resistance substitution unit.
Ignition: ON
Resistance substitution unit setting:
110
67
38
20 |
Display in
A1p1:
60 °C
80 °C
100 °C
120 °C |
Wiring,
A1,
Values OK:
B13 |
Printable version
