 |
 |
Test scope |
Test connection |
Test condition |
Nominal value |
Possible cause/Remedy |
| 1.0 |
P 1 7 5 0 |
Diagnostic module (OBD II , N59/1)
Voltage supply
Circuit 30 |
2 
(1.2) |
N59/1
 |
 4
(1.4) |
Ignition: ON |
11 - 14 V |
Wiring,
1.1 ,
Model 129
Base module (N161/1)
Model 202
Fuse (F1-32). |
| 1.1 |
|
Ground wire |
N59/1
2
(1.2) |
|
X11/4
3 |
Ignition: ON |
11 - 14 V |
Wiring,
Model 129
Ground (module box bracket, W27, Figure 1)
Model 202
Ground (component compartment, W16/4, Figure 2) |
| 2.0 |
|
Diagnostic module (OBD II , N59/1)
Voltage supply
Circuit 87E |
15
(1.15) |
N59/1
|
3
(1.3) |
Ignition: ON |
11 - 14 V |
Wiring,
2.1 ,
Model 129
Base module (N161/1)
Model 202
Overvoltage protection relay module (K1/2) |
| 2.1 |
|
Ground wire to engine control module |
15
(1.15) |
N59/1
|
4
(1.4) |
Ignition: ON |
11 - 14 V |
Wiring |
| 3.0 |
|
"CHECK ENGINE" MIL (A1e26)
Control
|
9
(1.9) |
N59/1
|
3
(1.3) |
Ignition: ON |
11 - 14 V |
Diagnostic module (OBD II, N59/1) |
| 4.0 |
P 0 1 3 2
P 0 1 3 4
P 0 1 3 1
P 1 1 3 1
P 0 1 3 3 |
O2S 1 (before TWC) (G3/2)
Signal |
2
(1.2) |
N59/1
|
14
(1.14) |
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 |
P 0 1 3 8
P 1 1 3 7
P 1 1 3 8 |
O2S 2 (after TWC) (G3/1)
Signal |
2
(1.2) |
N59/1
|
11
(1.11) |
Start engine at engine coolant temperature
> 80°C.
Maintain an engine speed of 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 |
P 1 3 3 5 |
Engine speed signal
TNA |
2
(1.2)
2
(1.2) |
|
19
(1.19)
19
(1.19)
|
Engine: at Idle |
Signal (Fig. 3)
5.0 - 7.5 V |
Wiring,
Engine control module (N3/4). |
| 7.0 |
P 1 3 4 0 |
CMP sensor (L5/1)
Output signal |
2
(1.2)
2
(1.2) |
|
20
(1.20)
20
(1.20)
|
Engine: at Idle |
Signal (Fig. 4)
9.5 - 11.0 V
(voltage jumps) |
Wiring,
CMP sensor (L5/1),
Engine control module (N3/4). |
| 8.0 |
P 1 4 4 3 |
Purge flow switchover
valve (Y27/6)
Current draw |
2
(1.2) |
N59/1
 |
12
(1.12)
|
Ignition: ON |
0.4 - 0.6 A |
Wiring,
Y27/6. |
| 9.0 |
P 0 4 4 1 |
Purge flow system
Logic chain |
2
(1.2) |
N59/1
 |
12
(1.12)
|
Connect vacuum tester to switchover valve (Y27/6) (Figure 5)
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 control valve (Y58/1),
Y27/6. |
| 10.0 |
P 1 4 4 4 |
Purge flow switchover
valve (Y27/6)
Logic chain vacuum switchover |
2
(1.2) |
N59/1
|
12
(1.12) |
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 |
P 0 1 0 5 |
DM pressure sensor (B5/2)
Voltage |
1
(1.1) |
N59/1
|
18
(1.18) |
Connect vacuum tester to pressure sensor (B5/2) using Y-fitting (Figure 5).
Ignition: ON
Engine: at Idle
|
> 3.5 V
< 2 V and vacuum increase to
> 500 mbar
|
Vacuum line,
Wiring,
11.1 ,
B5/2. |
| 11.1 |
|
DM pressure sensor (B5/2)
Voltage supply |
1
(1.1) |
N59/1
|
22
(1.22)
|
Ignition: ON |
4.7 - 5.3 V |
Diagnostic module (OBD II, N59/1) |
| 12.0 |
|
Diagnostic module coding
Model 129
Model 202 (Engine 104 only)
|
7
(1.7)
8
(1.8)
7
(1.7) |
|
|
Ignition: ON
|
11 - 14 V |
Wiring. |
| 13.0 |
P 0 6 0 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 6).
|
55 - 65  |
Data bus,
13.1 ,
Diagnostic module (OBD II, N59/1). |
| 13.1 |
|
CAN segment in engine control module (N3/4) |
L  |
N3/4
|
 H
|
Model 129
Remove control module (N3/4)
Model 202
Disconnect connector 1 from control module (N3/4) and test with ohmmeter directly on control module (Figure 7 and 8)
|
Models 129, 202
(with Engine 104)
115 - 125
Model 202 (with Engine 111)
55 - 65 |
Engine control module (N3/4),
13.2. |
| 13.2 |
|
On engine 104 to end of Model Year 1995
CAN segement in EA/CC/ISC control module (N4/1) or CC/ISC control module (N4/3)
On engine 104/111 as of Model Year 1996
CAN segement in RCL control module (N54)
|
20
(1.20)
44
(1.44)
L |
|
|
Disconnect control module (N4/1, N4/3 or N54) and test with ohmmeter directly on control module (Figure 9 - 13). |
115 - 125 |
EA/CC/ISC control module (N4/1), CC/ISC control module (N4/3) or RCL control module (N54). |
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