P0358
P0358Bar Ignition Module, Cylinder 8 (Bank 2) - Open Circuit/ Above Limit/Below Limit
Diagnostic conditions
- Battery voltage between 10 V and 16 V
- Time after the engine is started longer than 10 seconds
- If it is not possible to have more than 10 seconds after engine start-up, the starting speed is sufficient, if the battery is intact and the ambient temperature is 20 °C
Possible cause of fault
- Open circuit in the signal wire between DME control module (connector A, pin 7) and bar ignition module (pin 4)
- Short circuit to B+ in signal wire
- Short circuit to ground in signal wire
- Short circuit to B+ in ground wire of the ignition bar module (pin 1)
- Open circuit in ground wire of the ignition bar module (pin 1)
- Open circuit in power supply line of the ignition bar module (pin 3)
- Short circuit to ground in power supply line of the ignition bar module (pin 3)
- Fuse FE08, fuse carrier in E-box, radiator tank faulty (leads to a cutoff in an entire cylinder bank)
- Incorrect allocation of the ground wire and positive lead on the ignition bar module (pins 1 and 3)
- Safety cutoff in the ignition bar module (long ignition pulse implausible)
- Bar ignition module faulty
- DME control module faulty
Affected terminals
DME control module connector A, pin 7, and ignition bar module connector, pin 4 or pins 1 and 3
Diagnosis/troubleshooting
NOTE:
- The bar ignition module cannot be tested as it is an active component.
- If a fault occurs in the positive or ground supply, the bar ignition module switches the input of the signal wire (pin 4) to high resistance in order to forward the fault to the DME control module. The DME control module then enters the fault in the fault memory. The "open circuit" fault can have a variety of causes. It is strongly recommended, therefore, that troubleshooting is performed in accordance with the following table.
- If a faulty ignition bar module is diagnosed, the connection to the engine ground must be checked before a replacement is made (test step 9a or 1a), as otherwise a faulty engine ground connection will damage the new ignition bar module again.
CAUTION: Risk of damage to bar ignition modules. Removed ignition bar modules must be disconnected. Ignition bar modules that are still connected will be damaged when the starter is actuated because of the long spark gap.
Plug for bar ignition module
NOTE: If connector A is disconnected from the DME control module and the ignition is or was switched on, the 'DME Control Module TIMEOUT' fault is recorded in many control modules.
NOTE: If control module connector A was disconnected from the DME in the course of troubleshooting or if the voltage supply was interrupted elsewhere (battery, fuse), the throttle adjusting unit must be adapted.
NOTE: The wiring for DME control module, connector A, pin 7, and ignition bar module, pin 4 is routed via the K disconnection point, pin 5.
Ignition Bar Module, Cylinder 8 (Bank 2) - Open Circuit
Ignition Bar Module, Cylinder 8 (Bank 2) - Above Limit
Ignition Bar Module, Cylinder 8 (Bank 2) - Below Limit
