DESCRIPTION:
Fan circuit failed open.
MONITORED PARAMETER:
Fan control solenoid.
TYPICAL ENABLING CONDITIONS:
Always enabled
MONITOR SEQUENCE:
None
EXECUTION FREQUENCY:
Always enabled
TYPICAL DURATION:
2 seconds
DASH LAMPS:
None
ENGINE REACTION:
None
VERIFICATION:
Ignition cycle
NOTE: If codes 647-5, 1072-5, or 1071-5 active, repair wiring between pins 91 of the 120-pin MCM connector and the fan and the Jake brake Solenoids.
PROBABLE CAUSES:
1. Wiring between the fan control solenoid and 120-pin MCM connector.
2. Fan control solenoid failure.
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