Test step
|
Test
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: electronic circuit board |
| 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) |
| 3.0 |
1 |
Fuel level gauge (A1p2) |
|
|
|
Activate test mode 1 |
Analog fuel gauge reading  digital readout
|
A1p2,
3.1 |
| 3.1 |
6 - 9 |
Fuel level gauge (A1p2) |
|
|
|
Activate test modes 6 - 9 |
Figure 3 - 6 |
A1p2,
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:
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 |
| 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:
Reading on digital display only. The analog reading
shows  .
|
4.1 |
| 4.1 |
6 - 8 |
A1p10 |
|
|
|
Activate test modes
6 - 8 |
See Figures
3 - 5 |
A1p10,
4.2 ,
4.3
|
| 4.2 |
2 |
Fuel consumption signal from CFI control module (N3)
Engine 104, 119 CFI |
W16 |
|
N3
 8 |
Disconnect N3. Connect signal generator (Figure 9) and set to a voltage amplitude of approx. 10 V.
Ignition: ON
Activate test mode 2.
|
50 HZ = 5 l/h
100 HZ = 10 l/h
150 HZ = 15 l/h
200 HZ = 20 l/h
Note:
The readout is only visible on the digital display.
The analog reading
shows .
|
Wiring.
Note:
If no consumption (l/h) is indicated at idle speed and connected CFI control module (N3), replace the CFI control module (N3).
If no plausible values are indicated while driving, the speed signal is missing.
Replace electronic circuit board.
|
| 4.3 |
|
Fuel consumption signal from LH-SFI control module (N3/1 or N3/3)
Engine 119, 120 LH-SFI
Engine 104 HFM-SFI |
|
|
N3/1
or
N3/3 9
(1)
N3/4 7 (1)
|
Ignition: OFF
Remove N3/1, N3/3 or N3/4 (Figure 15, 16 and 17)
Connect signal generator and set to a voltage amplitude of approx. 10 V (Figure 18)
Ignition: ON
Activate test mode 2.
|
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 .
|
Wiring,
Electronic circuit board,
Values OK: N3/1, N3/3 or N3/4
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 functioning correctly, replace electronic circuit board. |
| 5.0 |
3 |
Oil pressure gauge with warning lamp (A1p3)
|
|
|
|
Engine: at Idle
Activate test mode 3.
Increase engine rpm |
Analog reading digital readout.
The oil pressure increases with increasing engine rpm.
|
A1p3,
5.1 |
| 5.1 |
6 - 7 |
Oil pressure gauge with warning lamp (A1p3) |
|
|
|
Activate test modes 6 - 7 |
See Figures 3
and 4 |
A1p3,
Electronic circuit board,
5.2
|
| 5.2 |
|
Wires and connections or oil pressure sensor (B5)
|
1 |
B5
|
2 |
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,
Electronic circuit board,
Values OK: check oil pressure (see SMS Engine, Mechanical),
B5. |
| 6.0 |
|
Oil pressure gauge with warning lamp (A1p3)
Oil pressure warning lamp function |
1 |
B5
|
2 |
If oil pressure is OK, disconnect connector at B5.
Connect resistance substitution unit.
Run engine at > 1200 rpm
Resistance substitution unit setting:
13 |
Display in
A1p3:
=0
Oil pressure warning lamp lights up.
|
5.2 ,
Electronic circuit board. |
| 7.0 |
4 |
Tachometer (A1p5)
|
|
|
|
Engine: at Idle
Activate test mode 4, increase engine rpm
|
Analog tachometer reading digital readout |
Wiring and connections,
TN - signal from ignition control module (N1/3),
A1p5,
Engine systems control
module (N16),
7.1 - 7.3
|
| 7.1 |
|
Tachometer (A1p5)
Engine 104 CFI |
W3 |
|
N1/3 4 (A) |
Disconnect plug A on N1/3
(Figure 1)
Connect signal generator and set to a voltage amplitude of approx. 10 V
Ignition: ON
|
Readout
50 HZ =
1000 rpm
194 HZ =
4000 rpm |
Wiring,
N16,
Values OK: N1/3.
|
| 7.2 |
|
Tachometer (A1p5)
Engine 119 CFI |
W3 |
|
N1/3 4 (A) |
Disconnect plug A on N1/3
(Figure 1).
Connect signal generator and set to a voltage amplitude of approx. 10 V.
Ignition: ON
|
Readout
70 Hz =
1000 rpm
270 Hz =
4000 rpm |
Wiring,
N16,
Values OK: N1/3. |
| 7.3 |
|
Tachometer (A1p5)
LH-SFI Engines
HFM-SFI Engines |
W16
W16 |
|
N16/1 13
N3/4 18 (1) |
Remove base module (N16/1) or engine control module (N3/4) (Figures 15, 16 and 17).
Connect signal generator and set to a voltage amplitude of approx. 10 V (Figure 18)
Ignition: ON |
Engine 119 LH-SFI
70 Hz =
1000 rpm
270 Hz =
4000 rpm
Engine 104 HFM-SFI , Engine 120 LH-SFI
50Hz =
1000 rpm
194Hz =
4000 rpm
|
Wiring,
Electronic circuit board,
Values OK on LH-SFI engines: N16/1,
DM, Chassis and Drivetrain,
Volume 1 - 1.1 23 ,
Values OK on HFM-SFI engines: N3/4. |
| 8.0 |
 |
Low engine oil level
indicator (A1e12) |
|
|
|
Oil level correct.
Engine: at Idle
Activate test mode 5.
|
Digital readout   = oil level indicator lamp OFF , oil level correct.
 = oil level indicator lamp ON , oil level incorrect
|
Wiring,
Oil level switch (S43). |
| 9.0 |
|
Electronic speedo-
meter (A1p8)
|
2
|
X26/12
 |
1
|
Disconnect 6-pole connector X26/12 (Figure 11)
Ignition: ON
Connect signal generator and set to a voltage amplitude of approx. 2 V. |
With increasing frequency the speed on the speedometer increases. |
Wiring,
Electronic circuit board,
A1p8,
If speedometer is OK, vehicle speed sensor (L2).
Note:
If the electronic speedometer and the fuel consumption indicator are not operating, the vehicle speed signal is missing.
|
| 10.0 |
|
Outside temperature
display (A1p4) |
1 |
X67
|
2 |
Disconnect 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 oC
= 0 oC
= + 50 oC |
Wiring,
A1p4,
Electronic circuit board,
Values OK: outside temperature sensor (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 oC
= 80 oC
= 100 oC
= 120 oC
|
Wiring,
A1p1,
Values OK: B13. |
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