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MAINTENANCE MANUAL
Kenworth SmartWheel Troubleshooting Guide
16
D. Cruise Control Does Not Work
D1. Symptom: Cruise Control will not turn on.
D1-1. Possible cause: No ignition power to electronics module.
D1-2. Possible cause: Problem in cruise control wiring.
Check
Result
What To Do Next
D1 -1 A
Turn on ignition. Push and release
cruise control On switch. Check if
LED over switch is on.
LED on.
Go to
D1-2
.
LED on only when button held
down.
Go to
D1-1B
.
LED does not turn on.
Go to
A1
.
D1-1 B
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
A3
.
No voltage.
Go to D
1-1C
.
D1 -1 C
Check circuit breaker or fuse in
power distribution box position
Spare 33.
Circuit breaker/fuse OK.
There is an open circuit from the
power distribution box to electronics
module. Trace circuit PCB 33.
Circuit breaker bad/fuse blown.
Replace ckt breaker or fuse. Deter-
mine cause for fuse to blow.
Check
Result
What To Do Next
D1 -2A
Check cruise ckt between pin 14 of
14-way connector at electronics
module and engine ECM. DDEC:
Ckt 953, CAT: Ckt
C993, Cummins: Ckt 588.
Also check jumper (pin 10 to 13)
Wiring, connectors OK all circuits
have continuity.
Go to D1-3.
Wire broken, connector unplugged,
loose or corroded.
Repair or replace wires and/or con-
nectors.
