Fault-Tracing Information

Fault-tracing information
998 8686 Replaced by 9511532 998 8686 Replaced By 9511532
Condition

Warning! Under no circumstances start engine during this test.

- The fault is permanent.
- The control module is correctly connected.




Test of vacuum motor and regulator function and ability of valves to maintain vacuum in vacuum servo.
The test is performed by operating the vacuum motor and regulator with extra cables connected to the control module connector.
Take care not to damage components by connecting cables incorrectly.
Carry out a visual inspection of boots and seals at joints.
Make two cables
One should be a single cable with narrow blade terminals at both ends. The other consists of two cables with two ordinary blade terminals at one end and two narrow blade terminals at the other end.

Possible source




- Open-circuit in cables between control module and vacuum pump/ regulator.
- Short-circuit to ground or supply in cables between the control module and the vacuum pump/regulator.
- Defective vacuum pump/regulator.
- The vacuum pump, regulator, vacuum servo, hoses or connections are not airtight.

Fault symptom[s]
- Cruise control does not engage.
- Cruise control does not disengage when the brake or clutch pedals are depressed.
- Vehicle speed increases constantly.