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 above6 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 stop running or engine speed will drop significantly.
UB1
Volvo ST, Test Box
-Disconnect the ST in accordance with QA2. Connecting The Volvo Scan Tool (ST)
-Connect the test box to 1CM 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.
-Re-install system 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.
If one or both of the values deviate
-Check the wiring between DI#6 and the ignition switch for breaks.