(01/02) KM816012 Page 17 of 39
MAINTENANCE MANUAL
Kenworth T2000 SmartWheel Troubleshooting Guide
16
C. Engine Retarder Does Not Work
C2. Symptom: Retarder works only when button held down or does not turn on.
C2-1. Possible cause: No ignition power to electronics module.
C3-2. Possible cause: Bad electronics module or steering wheel hub.
Check Result What To Do Next
C2-1A
Turn on ignition. Push any one of the
engine brake switches.
Check if LED over that switch is on.
LED on. Go to C2-2.
LED lights only when button held
down.
Go to C2-1B.
LED does not turn on. Go to C2-2.
C2-1B
Unplug 6-way connector from elec-
tronics module. Check voltage
between connector pins 4 and 3 with
ignition on.
Voltmeter reads battery voltage. Go to C2-2.
No voltage. Go to C2-1C.
C2-1 C
Check circuit breaker or fuse in CEP
position
Spare 33.
Circuit breaker/fuse OK. There is an open circuit from the
CEP to electronics module. Trace ckt
MPX IGN.
Circuit breaker bad/fuse blown. Replace circuit breaker or fuse.
Determine cause for fuse to blow.
Check Result What To Do Next
C2-2A
Check for continuity between pins 13
and 14 of the 14 way connector on
the electronics module (with any
retarder setting turned on).
Continuity. Problem must be in retarder wiring
or engine ECM. Retrace retarder cir-
cuits.
No continuity. Problem may be in electronics mod-
ule or steering wheel hub. Go to A3.
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