 |
 |
Test scope |
Test connection
|
Test condition |
Nominal value |
Possible cause/Remedy |
| 1.0 |
     |
Diagnostic module (OBD II , N59/1)
Voltage supply
Circuit 30 |
25 
(1.25) |
N59/1
 |
 5
(1.5) |
Ignition: ON |
11 - 14 V |
Wiring,
1.1 ,
Model 129, 140: Base module (N16/1).
Model 210: Relay module (K40) |
| 1.1 |
|
Ground wire |
N59/1
25
(1.25) |
|
X11/4
3 |
Ignition: ON |
11 - 14 V |
Model 129: Ground, module box bracket (W27),
Model 140 to end of 1995: Electronic ground, right footwell (W15)
Model 140 as of 1996: Ground, right rear seat (W17)
Model 210 : Ground, left wheelhousing (W16/3) |
| 2.0 |
|
Diagnostic module (OBD II , N59/1)
Voltage supply
Circuit 87E |
31
(1.31) |
N59/1
|
26
(1.26)
|
Ignition: ON |
11 - 14 V |
Wiring,
2.1 ,
Model 129, 140: Base module (N16/1).
Model 210: Relay module (K40) |
| 2.1 |
|
Ground wire to engine control module (N3/4) |
31
(1.31) |
N59/1
|
5
(1.5) |
Ignition: ON |
11 - 14 V |
Wiring |
| 3.0 |
|
"CHECK ENGINE" MIL
Control
|
28
(1.28) |
N59/1
|
26
(1.26)
|
Ignition: ON |
11 - 14 V |
Diagnostic module (OBD II, N59/1) |
| 4.0 |
 
|
O2S 1 (before TWC) (G3/2)
Signal |
31
(1.31) |
N59/1
|
7
(1.7) |
Engine: at Idle
and at operating temperature >80 °C. Run engine at idle for at least 2 minutes.
|
oscillates between -0.2V and +1.0 V, by more than
0.3 V. |
Wiring,
G3/2. |
| 5.0 |
|
O2S 2 (after TWC) (G3/1)
Signal |
31
(1.31) |
N59/1
|
6
(1.6) |
Start engine at engine coolant temperature
>80 °C.
Increase and hold engine speed to 2000 - 3000 rpm for approx. 3 minutes until O2S 2 (after TWC) heater is switched on (see HHT).
Accelerate briefly.
|
450 mV
constant
Voltage changes
Voltage changes by
> 100 mV
|
Wiring,
G3/1 |
| 6.0 |
|
Engine speed signal
TNA |
31
(1.31)
31
(1.31) |
|
8
(1.8)
8
(1.8)
|
Engine: at Idle |
Signal see Figure 1
5.0 - 7.5 V |
Wiring,
Engine control module (N3/4).
|
| 7.0 |
|
Model 129, 140
CMP sensor (L5/1)
Model 210
Camshaft Hall-effect sensor (B6/1)
Output signal |
31
(1.31)
31
(1.31) |
|
3
(1.3)
3
(1.3)
|
Engine: at Idle |
Signal see Figure 2 and 3
9.5 - 11.0 V
voltage jumps |
Wiring,
CMP sensor (L5/1),
Camshaft Hall-effect
sensor (B6/1),
Engine control module (N3/4). |
| 8.0 |
|
Purge flow switchover
valve (Y27/6)
Current draw |
25
(1.25) |
N59/1
 |
10
(1.10)
|
Ignition: ON |
0.4 - 0.6 A |
Wiring,
Y27/6. |
| 9.0 |
|
Purge flow system
Logic chain |
25
(1.25) |
N59/1
 |
10
(1.10)
|
Connect vacuum tester to switchover valve (Y27/6) (see Figure 4)
Engine: Start and bring to operating temperature
(80 °C)
Engine speed approximately 2500 rpm |
Purge switchover valve (Y58/1) noticeably cycles.
Vacuum tester needle oscillates by approx. 5 mbar vacuum with cycle frequency of the purge control valve (Y58/1)
|
Regeneration line,
Purge switchover valve (Y58/1),
Y27/6. |
| 10.0 |
|
Purge flow switchover
valve (Y27/6)
Logic chain vacuum switchover |
25
(1.25) |
N59/1
|
10
(1.10) |
Connect vacuum tester to switchover valve (Y27/6).
Disconnect 2-pole connector from purge control valve (Y58/1).
Engine: at Idle
Remove bridge from socket box tester
|
approx. 0 mbar vacuum
> 500 mbar vacuum |
Vacuum line,
Y27/6. |
| 11.0 |
|
DM pressure sensor (B5/2)
Voltage |
2
(1.2) |
N59/1
|
17
(1.17)
|
Coonect vacuum tester to pressure sensor (B5/2) using Y-fitting (Figure 4).
Igmition: ON
Engine: at Idle |
> 3.5 V
< 2 V and pressure increase to
> 500 mbar
|
Vacuum line,
Wiring,
11.1 ,
B5/2. |
| 11.1 |
|
DM pressure sensor (B5/2)
Voltage supply |
2
(1.2) |
N59/1
|
16
(1.16)
|
Ignition: ON |
4.7 - 5.3 V |
Diagnostic module (OBD II, N59/1) |
| 12.0 |
 |
CAN databus |
L |
N59/1
 |
H |
Ignition: OFF
Disconnect test cable or diagnostic module.
Test with ohmmeter directly on both connections of diagnostic module connector (Figure 5).
|
Model 140 to end of 1995
55 - 65 
Model 129, 140, 210 as of 1996
115 - 125 |
Data bus,
12.1 ,
Diagnostic module (OBD II, N59/1). |
| 12.1 |
|
CAN segment in engine control module (N3/4)
Resistance |
L  |
N3/4
|
 H |
Remove control module (N3/4) or disconnect connector 1 from control module (N3/4) and test with ohmmeter directly on control module (Figure 6).
|
115 - 125 |
Engine control module (N3/4),
12.2. |
| 12.2 |
|
CAN segement
Model 140 to end of 1995
in EA/CC/ISC control module (N4/1) or CC/ISC control module (N4/3)
Model 129, 140 as of 1996 and Model 210 in RCL control module (N54)
|
L
44
(1.44) |
N4/1
N54
N4/3 |
H
45
(1.45) |
Remove control module (N4/1, N4/3 or N54) and test with ohmmeter directly on control module
(Figure 7 - 9) |
115 - 125 |
EA/CC/ISC control module (N4/1),
CC/ISC control module (N4/3), RCL control module (N54). |
| 13.0 |
|
Coding diagnostic module (N59/1)
Model 129
Model 210 |
9
(1.9)
29
(1.29)
|
|
26
(1.26)
26
(1.26)
|
Ignition: ON |
11 - 14 V |
Wiring. |
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