Diagnostic Sub-Routines

The following information details possible fault conditions, causes and remedies. Detail test procedures for components are covered in Pin-point Tests.

Fault: System inoperative
Possible causes: 1. Fuse F10 (LH 'A' post base fuse-box) blown.
2. Pneumatic circuit fault (i.e. vacuum leak)
3. Brake switch fault.
4. Clutch switch or link fault. Gear position input fault (automatic transmission only).
5. Harness wiring or connector faulty.
6. Set switch faulty.
7. Paddle switch faulty
8. Traction control input high.
9. Road speed input missing.
10. Dump valve failure.
11. Vacuum pump/control valve unit failure.

Remedy: 1. Examine fuse F10, if blown determine reason for failure and renew.
2. Examine all pipework, connections and components for damage or
disconnection's, repair or renew as necessary.
3. Check brake switch operation, renew if necessary.
4. Check clutch switch operation (manual transmission) or link connection/position
input (automatic transmission), renew if necessary.
5. Examine harness wiring. Examine connectors for corroded, damaged or distorted pins.
6. Check set switch operation and wiring, renew if necessary.
7. Check paddle switch operation and wiring, renew if necessary.
8. Examine harness wiring between SCCM and ABS/TC CM, check ABS/TC CM fault diagnosis.
9. Examine harness wiring between SCCM and instrument pack, check pack fault diagnosis.
10. Renew faulty valve.
11. Renew faulty unit

Fault: Clutch pedal operation does not disable system

Cause: 1. Clutch pedal switch or harness failure.
Remedy: 1. Check switch operation and wiring connections. Repair or renew switch/wiring as necessary.

Fault: Neutral gear selection does not disable system (automatic transmissions only)

Cause: 1. Faulty signal from gear selection module.
2. Harness wiring or connector fault
Remedy: 1. Examine transmission fault diagnosis.
2. Examine harness between gear selection module and SC CM pin 18.

Fault: Resume facility (only) not operating correctly

Possible causes
1. Switch faulty.
2. Harness wiring or connector faulty.

Remedy: 1. Check switch operation renew if necessary.
2. Examine harness wiring from switch to SCCM and from switch to ground.
Examine connectors for corroded, damaged or distorted pins.

Fault: System will not disable at paddle switch
Possible causes:
1. Switch faulty.
2. Harness wiring or connector faulty
Remedy: 1. Check switch operation renew if necessary.
2. Examine harness wiring from switch to SCCM and from switch to ground.
Examine connectors for corroded, damaged or distorted pins.

Fault: Set speed not steady

Possible causes: 1. Throttle linkage out of adjustment.
Remedy: 1. Check linkage and re-adjust as shown in image.

Throttle Linkage Adjustment, Fig.1: