UB. DI #6 No Power Supply From the Ignition Switch

UB. DI#6

DI#6 No power supply from the ignition switch




Fault message conditions:
The fault message is logged if voltage does not go above 6 volt within 10 seconds of entering Running Test. If MFI and the power stage are connected to the ST a fault message will also be logged if the voltages to DI#6, MFI #35 and power stage #4 differ.

Causes of fault:
Break in the wiring between DI#6 and the ignition switch.

Fault symptoms:
The engine will not start.
If the break is intermittent the engine will quit or engine speed will drop significantly.

UB1




Volvo ST, Test box
- Disconnect the ST in accordance with QA2.
- Connect the test box to ICM and check the GND points in accordance with P3-P4.
^ Continue with Checking the power supply UB2.

UB2




Checking the power supply
- Connect the control module to the test box.
- Install the fuse.
- Ignition on.
Connect a voltmeter between DI#6 and DI#20.
The voltmeter should read battery voltage.




Check that the voltmeter reads battery voltage when the starter motor is operating and the engine running.

If both values are OK
Intermittent break.
^ Check the connections between DI#6 and the ignition switch for loose contacts in accordance with NA5. NA. Checking the Wiring

If one or both of the values deviate
^ check the wiring between DI#6 and the ignition switch for breaks in accordance with NA2. NA. Checking the Wiring