The individual test steps (e. g. ignition coils, distributor cap etc.) are organized into a test program.
If a complaint is determined through engine diagnosis in Engines, Volume 1, which refers to a specific test step, only the specific test step should be performed and not the entire test program.
Diagnostic Trouble Code (DTC) Readout with Impulse Counter Scan Tool
The ignition control modules (N1/4 and N1/5) are equipped with diagnostics, including DTC memory.
Malfunctions which occur with the engine running are counted by the respective malfunction counter. A DTC is recorded into the respective control unit's memory only if the same fault has occurred after 8 sequential engine starts.
This prevents a DTC from being recorded if, for example, it occurred only once. If, for example, a fault occurred only 7 times, then the DTC memory will be cleared again after a certain number of engine starts.
The DTC memory can be read with the impulse counter scan tool.
The memory remains active even if the vehicle's battery is disconnected.
The following malfunction is stored immediately:
- Crankshaft position sensor defective (DTC readout 1 7 )
Malfunctions can be recalled from memory using the impulse counter scan tool with engine off and ignition "ON". DTC's ranging from 1 to 3 9 may appear on the display of the impulse counter scan tool.
The DTC 1 indicates: No fault recognized in system.
All further DTC's refer to a particular malfunction source. If there are multiple system malfunctions, the malfunction assigned with the lowest DTC will be displayed first.
If the DTC indicated first reappears after more than two DTC readouts, then no further malfunctions are present in the system. After eliminating all faults, they must be cleared individually .
In case of engine complaints, the DTC memory must be read and the fault must be eliminated before proceeding with any additional repairs.
The DTC readout must be performed on both ignition control
modules (N1/4 and N1/5).
Possible indicated faults of the left or right control module must be checked with the socket box tester.
If the engine does not run, both ignition systems must be checked, one after another, with the socket box tester.
Preparation for Test with Impulse Counter Scan Tool
 Connect impulse counter scan tool according to connection diagram (see section 0),
Perform DTC readout (see section 0).
|
DTC
 |
|
Possible cause |
Test step/Remedy 1) |
| 1 |
|
No fault in system |
- |
| 2 |
|
Maximum retard setting on at least one cylinder has been reached. |
Increased knock tendency, i.e. due to poor fuel quality, carbon build-up, mechanical damage. |
| 3 |
|
Not used |
- |
| 4 |
|
Load sensor in ignition control module (N1/4 or N1/5) defective. |
Check vacuum supply to ignition control
module (N1/4 or N1/5),
Ignition control module (N1/4 or N1/5). |
| 5 |
|
Knock sensors (A16) 1 and/or 2 defective. |
Knock sensor not plugged in at ignition control module (N1/4 or N1/5),
Knock sensor (A16). |
| 6 |
|
Camshaft position sensor (L5/2 or L5/3) defective |
 24  1.0 |
| 7 |
|
Knock control-output switch in ignition control module (N1/4 or N1/5) defective. |
Ignition control module (N1/4 or N1/5). |
| 8 |
|
Transmission overload protection switch, brake band B1 (S65) and/or B2 (S65/1) does not close |
24 4.0 |
| 9 |
|
Transmission overload protection switch, brake band B1 (S65) and/or B2 (S65/1) does not open |
24 5.0 |
| 1 0 |
|
Not used |
- |
| 1 1 |
|
Left or right reference resistor (DI) (R16/3 or R16/4) defective |
24 3.0 |
| 1 2 |
|
TN engine speed signal is outside the tolerance range |
24 7.0 |
| 1 3 |
|
Not used |
- |
| 1 4 |
|
Not used |
- |
| 1 5 |
|
Ignition coil output from left or right ignition control module (N1/4 or N1/5) defective or primary winding of ignition coil has open circui |
23 7.0 |
| 1 6 |
|
Not used |
- |
| 1 7 |
|
Left or right crankshaft position sensor (L5/4 or L5/5) defective |
23 4.0 |
| 1 8 |
|
Not used |
- |
| 1 9 |
|
Ground, coding from left ignition control module (N1/4) not present |
24 8.0 |
| 2 0 |
|
Left or right ignition control module (N1/4 or N1/5) DTC memory defective |
Ignition control module (N1/4 or N1/5). |
| 2 1 |
|
Load sensor in left or right ignition control module (N1/4 or N1/5) defective (recognized with engine running) |
Ignition control module (N1/4 or N1/5). |
| 2 2 |
|
Not used |
- |
| 2 3 |
|
Not used |
- |
| 2 4 |
|
Not used |
- |
| 2 5 |
|
Not used |
- |
| 2 6 |
|
Left or right ignition control module (N1/4 or N1/5) data exchange malfunction |
24 9.0 - 10.0 |
| 2 7 |
|
Left or right LH-SFI control module (N3/2 or N3/3) data exchange malfunction |
24 9.0 |
| 2 8 |
|
EA/CC/ISC control module (N4/1) data exchange malfunction |
24 9.0 |
| 2 9 |
|
Not used |
- |
| 30 |
|
Not used |
- |
| 31 |
|
Not used |
- |
| 33 |
|
Not used |
- |
| 3 3 |
|
Not used |
- |
| 3 4 |
|
Ignition misfire, cylinder 7 (left cylinder bank) or 1 (right cylinder bank) |
2) |
| 3 5 |
|
Ignition misfire, cylinder 11 (left cylinder bank) or 5 (right cylinder bank) |
2) |
| 3 6 |
|
Ignition misfire, cylinder 9 (left cylinder bank) or 3 (right cylinder bank) |
2) |
| 3 7 |
|
Ignition misfire, cylinder 12 (left cylinder bank) or 6 (right cylinder bank) |
2) |
| 3 8 |
|
Ignition misfire, cylinder 8 (left cylinder bank) or 2 (right cylinder bank) |
2) |
| 3 9 |
|
Ignition misfire, cylinder 10 (left cylinder bank) or 4 (right cylinder bank) |
2) |
| 4 0 |
|
Not used |
- |
| 4 1 |
|
Not used |
- |
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