 |
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,
Fuse F17 in Fuse box F3
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,
Fuse F23 in Fuse box F3
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,
Fuse F24 in Fuse box F3
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  11 and 23 or 24 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 24 Figures
2 - 9
|
A1,
3.2 |
| 3.2 |
|
Wires and connections and 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 |
| 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
HFM-SFI control module
(N3/4) or ME-SFI engine
control module (N3/10 or
N3/12)
with HFM-SFI:
with ME-SFI: |
18
(1)
W16
56
(1)
W16
|
|
7
(1)
N3/4
7
(1)
58
(1)
N3/10
or
N3/12
58
(1) |
Ignition: OFF
Disconnect N3/4 or N3/10 or N3/12 (Figures 11 to 14).
Connect signal generator (Figure 15) and make connection for rpm signal as follows:
HFM-SFI
First bridge N3/4 pin socket 18 to pin socket 7, then connect signal generator (pin 7 and ground)
ME-SFI
First bridge N3/10 or N3/12 pin socket 56 to pin socket 58, then connect signal generator
Set to a voltage amplitude of approx. 10 V.
Ignition: ON
Activate test mode 2.
|
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
- 9.6 >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 and 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 HFM-SFI:
with ME-SFI: |
W16
W16 |
|
N3/4
18
(1)
N3/10
or
N3/12
56
(1)
|
Disconnect plug on N3/4 (HFM-SFI) or N3/10 or N3/12 (ME-SFI) (Figures 11 to 14).
Connect signal generator and set to a voltage amplitude of approx. 10 V (Figure 15).
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 |
| 7.0 |
5 |
Low engine oil level
indicator lamp (A1e12) |
|
|
|
Oil level correct.
Engine: at Idle
Activate test mode 5.
|
Readout in odometer:
   Oil level OK, indicaor: OFF
 Oil level not OK, indicaor:
ON
|
Wiring,
Oil level switch (S43) |
| 8.0 |
|
Electronic speedo-
meter (A1p8)
Vehicles with ESP or vehicles with ASR or ETS
as of 9/95:
For left front axle VSS sensor (L6/1) output (feed signal to A1p8) from the Traction System control module (N47).
See D.M., Chassis and Drivetrain,
Vol. 3, 9.3 23
or
Vol. 3, 10.1 23 |
W16
|
|
N47
1
(1) |
Disconnect connector from N47 (Figure 11, or 12).
Connect signal generator and set to a voltage amplitude of approx. 10 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,
Volume 3 - 9.3 >23
N47-5
D.M., Chassis and Drivetrain,
Volume 3 - 10.1 > 23 |
| 9.0 |
|
Outside temperature
display (A1p4) |
9 |
X24
|
10
|
Disconnect 2-pole
connector X24 ( 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,
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) |
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,
A1
Values OK:
B13
|
| 11.0 |
|
Instrument cluster (A1)
Data line from traction system control module (N47)
ETS or ASR:
ESP: |
N47
7 (1)
9 (1) |
|
A1
14
(2)
14
(2) |
Remove A1
Disconnect connector 2 |
 5
|
Wiring,
Values OK:
N47,
D.M., Chassis and Drivetrain,
Vol. 3, 9.3 >23 or
D.M., Chassis and Drivetrain,
Vol. 3, 10.1 >23 |
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