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,
Exterior lamp switch (S1).
|
| 3.0 |
|
Fuel level gauge (A1p2) |
|
|
|
Activate test mode 1
(see Figure 1). |
Analog fuel gauge reading  digital readout
|
A1p2,
3.1 |
| 3.1 |
6 - 9 |
A1p2 |
|
|
|
Activate test modes 6 - 9.
|
Figures 2 - 5 |
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
|
Wrong reference resistor installed,
check reference resistor,
 23 (Figures 7 and 8),
Wiring,
Values OK: B4. |
| 4.0 |
2 |
Fuel consumption
indicator (A1p10) |
|
|
|
Engine: at idle
Activate test mode 2, increase rpm. |
With increasing rpm the consumption in l/h increases.
Note:
The display can only be read on the digital display.
The analog reading
shows  .
|
4.1. |
| 4.1 |
6 - 8 |
|
|
|
|
Activate test modes 6 - 8.
|
See Figures
2 - 5 |
A1p10,
4.2.
|
| 4.2 |
|
Fuel consumption signal from: LH-SFI control module (N3/1, N3/3) or
Engine control module (N3/4) or
EDS control module (N39) |
W3/3
W3/3
W3/3 (1) |
LH-SFI control module
Engine control module
EDS control module
|
N3/1
or
N3/3 9 (1)
N3/4 7 (1)
N39 13
|
Ignition: OFF
Remove N3/1, N3/3, N3/4 or N39 (Figure 9, 10, 14 and 15).
Connect signal generator and set to a voltage amplitude of approx. 10 V (Figure 16).
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
EDS
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,
Electronic circuit board,
Values OK: N3/1, N3/3, N3/4 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 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. |
Oil pressure indicator
Analog reading digital readout.
The oil pressure increases with increasing engine rpm.
|
A1p3,
5.1
|
| 5.1 |
6 - 7 |
|
|
|
|
Activate diagnostic
tests 6 - 7 |
See
Figures 2 - 5 |
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 |
Check oil pressure.
If oil pressure is OK, disconnect connector at B5.
Connect resistance substitution unit.
Start engine, increase engine speed > 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.
Raise engine speed. |
Analog tachometer reading digital readout.
|
A1p5,
Electronic circuit board,
7.1 |
| 7.1 |
|
A1p5
at LH-SFI or diesel engine
at HFM-SFI engine |
W3/3
W3/3 |
|
N16/1 13 (1)
N3/4 18 (1) |
Remove N16/1 or N3/4 (Figures 9, 10, 14 and 15).
Connect signal generator and set to a voltage amplitude of approx. 10 V (Figure 16).
Ignition: ON |
Engine 104, 120
50 Hz =
1000 rpm.
194 Hz =
4000 rpm.
Engine 119
70 Hz =
1000 rpm.
270 Hz =
4000 rpm.
Engine 603
2400 Hz =
1000 rpm.
9600 Hz =
4000 rpm.
|
Wiring,
Electronic circuit board,
Values OK on LH-SFI or diesel engine: N16/1
DM, Chassis and Drivetrain,
Vol. 1 - 1.1 or 1.2 23 .
Values OK on HFM-SFI engine: N3/4 |
| 8.0 |
5 |
Low engine oil level indicator lamp (A1e12) |
|
|
|
Engine oil level OK (check with dipstick)
Engine: at idle
Activate test mode 5. |
Digital readout    = oil level indicator lamp OFF , oil level correct.
Digital readout
 = oil level indicator lamp ON , oil level incorrect.
|
Wiring,
Oil level switch (S43). |
| 9.0 |
|
Electronic speedo-
meter (A1p8) |
W3/3
W3/3 |
ABS only
ASR (with ABS)
|
N30 3 (1)
N30/1 36 (1)
|
Remove N30 or N30/1, (Figure 9 and 10).
Connect signal generator and set to a voltage amplitude of approx. 10 V (Figure 16).
Ignition: ON
|
With increasing frequency the speed on the speedometer must increase. |
Wiring,
Electronic circuit board.
Values OK: N30 or N30/1
DM, Chassis and Drivetrain,
Vol. 2 - 6.2 23 or
- 5.2 23 . |
| 10.0 |
|
Outside temperature
display (A1p4) |
9 |
X24
|
10 |
Disconnect headlamp harness connector
(X24, Figure 11).
Connect resistance substitution unit.
Ignition: ON
Resistance substitution unit setting:
53 k
9.8 k
1 k
|
Display in
A1p4:
= - 30oC
= 0oC
= + 50oC |
Wiring,
A1p4,
Electronic circuit board.
Values OK: Check outside temperature sensor (B14).
|
| 11.0 |
|
ECT gauge (A1p1) |
W11
W11 |
Gasoline engine
B13
Diesel engine
B13
|
|
Disconnect plug at
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.
|
Printable version
