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Page 19 of 44
MAINTENANCE MANUAL
Kenworth SmartWheel Troubleshooting Guide
16
C. Engine Retarder Does Not Work
NOTE: Use this section only if retarder does not work. If none of the SmartWheel functions work, go to Section A.
C2. Symptom: Engine retarder will not turn on (all engines).
C2-1. Possible cause: No accessory power to electronics module.
C2-2. Possible cause: Problem in retarder wiring.
o
Check
Result
What To Do Next
C2-1A
Unplug 14-way connector from elec-
tronics module. Turn on ignition.
Check voltage between connector
pin 12 and a cab ground.
Voltmeter reads battery voltage.
No voltage. Go to C2-1 B.
Go to
C2-2
.
Go to
C2-1B
.
C2-1B
Check circuit breaker or fuse in
power distribution box position
Spare 19, 20, or 21.
Circuit breaker/fuse OK.
An open circuit exists between the
power dist box & the electronics
module. Trace circuits PCB 19, 20,
21.
Circuit breaker bad/fuse
Replace circuit breaker or blown.
fuse. Determine cause for fuse to
blow.
Check
Result
What To Do Next
2-2A
Check retarder circuits between
electronics module 14-way connec-
tor pins 9,11, 14 and engine ECM.
DDEC: 953, 979, 583. CAT: C993,
E716, E717. Cummins: 588, C96JH,
C98JF.
Wiring, connectors OK all circults
have continuity.
Go to
C3-2
.
Wire broken, connector unplugged,
loose or corroded.
Repair or replace wires and/or con-
nectors.
