(01/02)
KM816010
Page 15 of 44
MAINTENANCE MANUAL
Kenworth SmartWheel Troubleshooting Guide
16
C. Engine Retarder Does Not Work
C1. Symptom: Engine retarder will not turn on (1994 Cummins only).
C1-1. Possible cause: No power or ground to retarder circuit.
C1-2. Possible cause: Problem in retarder circuits C96JH or C98JF.
Check
Result
What To Do Next
C1-1A
Engine retarder (ENG RTD) circuit
breaker or fuse in cab power distri-
bution box.
Circuit breaker or fuse OK.
No continuity.
Go to
C1-1B
.
Determine cause for fuse to blow
(shorted wire, etc.).
Replace circuit breaker or fuse. If
retarder still does not work, go to
C1-1B
.
C1-1B
Continuity in ground circuit for
retarder relays (ckt C97CS) from
relay coil to cab ground.
Connector OK, continuity to cab
ground.
Go to
C1-2
.
Connection loose, broken, corroded.
Repair or replace connector(s),
tighten ground stud.
Check
Result
What To Do Next
C1-2A
Retarder wiring/ connections
leading to engine brake solenoids
(ckts C96JH and C98JF). Use multi-
plex steering wheel Select engine
wiring diagram.
Wires OK, connectors clean and
tight.
Go to
C1-3.
Wires broken, frayed, or connectors
loose, damaged, corroded.
Repair or replace wires and/or con-
nectors.
