 |
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,
Rotary light switch (S1),
Short circuit in circuit 58d (output from A1). |
| 3.0 |
|
Instrument cluster (A1)
Data line from traction system control module (N47)
ETS or ASR:
ESP: |
N47
7
9 |
|
A1
14
14 |
Remove A1,
Disconnect connector 2 |
 5 
|
Wiring,
Values OK:
N47,
D.M., Chassis and Drivetrain,
Vol. 3, 9.1 >23 or
D.M., Chassis and Drivetrain,
Vol. 3, 10.1 >23 |
| 4.0 |
1 |
Fuel level gauge (A1p2) |
|
|
|
Activate test mode 1
(see Figure 1)
|
Analog fuel gauge reading  digital readout
|
A1,
4.1 |
| 4.1 |
6 - 9 |
Fuel level gauge (A1p2) |
|
|
|
Activate test modes 6 - 9
|
see Figures
2 - 13
|
A1,
4.2 |
| 4.2 |
|
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:
70 ± 3
62 ± 1
53±2
37±2
21 ±2
5 ±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 |
| 5.0 |
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.
|
5.1 |
| 5.1 |
6 - 8 |
A1p10 |
|
|
|
Activate test modes 6 - 8
|
see Figures
2 - 13 |
A1,
5.2 |
| 5.2 |
2 |
Fuel consumption signal from HFM-SFI control module (N3/4) or ME-SFI engine control module (N3/10 or N3/12)
with HFM-SFI:
with ME-SFI: |
W16
W16 |
|
N3/4
7
(1)
N3/10 or
N3/12
58
(1)
|
Ignition: OFF
Disconnect HFM-SFI (N3/4) or ME-SFI (N3/10 or N3/12) control modules
(Figures 15 to 19).
Connect signal generator (Figure 20) and set to a voltage amplitude of
approx. 10 V.
Connect wire for rpm signal as follows:
HFM-SFI
N3/4 socket 7 to
socket 18.
ME-SFI
N3/10 or N3/12
socket 58 to socket 56
Ignition: ON
Activate test mode 2.
|
LH-SFI/
HFM-SFI
25 HZ 5 l/h
50 HZ 10 l/h
75 HZ 15 l/h
100 HZ 20 l/h
Note:
The readout is only visible on the digital display.
The analog reading
shows 0. |
Wiring,
A1,
Values OK: N3/4
Engines, Volume 2 - 1.1 >23
N3/10 or N3/12:
Engines, Volume 4 - 9.5 >23 or
- 9.6 >23
Note:
If no plausible values are indicated while driving and the speedometer is in order: A1
|
| 6.0 |
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
6.1 |
| 6.1 |
6 - 7 |
Oil pressure gauge (A1p3) |
|
|
|
Activate test modes 6 - 7
|
see Figures
2 and 7
|
A1,
6.2 |
| 6.2 |
|
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
Note:
Before changing each resistance value, the ignition must be turned off and then turned on again.
|
Display in
A1p3:
0
1
2
3 |
Wiring,
A1,
Values OK: check oil pressure (see SMS Engine, Mechanical),
B5 |
| 7.0 |
4 |
Tachometer (A1p5) |
|
|
|
Engine: at Idle
Activate test mode 4, increase engine rpm |
Analog tachometer reading digital readout |
A1,
7.1 |
| 7.1 |
|
Tachometer (A1p5)
with HFM-SFI:
with ME-SFI: |
W16
W16 |
|
N3/4
18
(1)
N3/10 or N31/12
56
(1)
|
Disconnect plug on HFM-SFI (N3/4) or ME-SFI (N3/10 or N3/12) (Figures 15 to 19).
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
|
Wiring,
A1,
Values OK on HFM-SFI engine: N3/4
Values OK on ME-SFI engine: N3/10 or N3/12 |
| 8.0 |
5 |
Low engine oil level
indicator lamp (A1e12) |
|
|
|
Oil level correct.
Engine: at Idle
Activate test mode 5.
Readout in odometer:
0
1 |
oil level OK
oil level not OK |
Wiring,
Oil level switch (S43) |
| 9.0 |
|
Electronic speedo-
meter (A1p8)
Vehicles with ESP and vehicles with ASR or ETS
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
or Vol. 3, 10.1 23
|
W16 |
|
N47
|
Disconnect connector from traction system control module (N47) (Figures 11, 12 or 13).
Connect signal generator and set to a voltage amplitude of approx. 2 V .
Ignition: ON |
With increasing frequency the speed on the speedometer increases. |
Wiring,
A1
Values OK: N47-1 or N47-2,
D.M., Chassis and Drivetrain,
Vol. 3 - 9.1 >23,
N47-5,
D.M., Chassis and Drivetrain,
Vol. 3 - 10.1 >23 |
| 10.0 |
|
Outside temperature
display (A1p4) |
1 |
X67
|
2
|
Disconnect 2-pole connector X67 (Figure 10).
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,
10.1 |
| 10.1 |
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 |
| 11.0 |
|
ECT gauge (A1p1) |
W11
|
|
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,
Values OK;
B13,
A1 |
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