I have an '86 SE and I am having cruise control problems. I have been using Mitchell's trouble-shooting guide for General Motors Custom Cruise III, and I have gotten to a point where I am just stuck.
Problem:
Cruise will not engage.
Tests I have done and results:
>Tested the "Set/Coast" switch. The switch failed so I replaced the turn signal lever with a new GM one.
>Tested the release switches on the brake and clutch pedals per instructions and found the clutch switch was out of adjustment. I corrected this and test drove the car. Still, no engagement
>I manually tested the Servo by using jumper wires with the engine running. The servo engaged fully and held it's position.
>I back-probed terminal "D" at the Control Module to test for a speed sender signal and got 8.5 volts while driving. here is where my problem is. ---> I don't quite understand the instructions on properly testing the speed sender circuit, which keeps referring to taking voltages at the "buffer". where is the buffer?? If I am getting 8.5 volts at the control module when the wheels are turning, does that mean that the speed sender is working properly or does it mean that the control module is bad?
>> here is a copy of the speed sender test for reference:
Speed Sender Test (PM Generator Type)
1) See if check engine light is on. If not, go to step 2. If yes, go to step 5.
2 With ignition on, engagement switch in "ON" position, all connectors mated and drive wheels spinning, use a digital voltmeter to back probe terminal E of buffer 8-pin connector. If there is a varying output around 4 volts, replace control module.
3 If voltage measured in step 2 was not as stated, disconnect 8-pin connector at buffer and measure voltage at connector cavity E. If voltage is 8.2 volts, replace buffer. If not, back probe connector terminal D at control module with 8-pin connector with buffer still connected.
4 If voltage measured in step 3 was still 9.2 volts, find open in wire from terminal D at control module to terminal D of buffer. Repair as required. If voltage was not 8.2 volts, replace control module.
5 If vehicle check engine light was on in step 1, disconnect the 3 wire terminal connector at the buffer. Using a digital voltmeter in A/C scale, measure voltage accross terminals 1 and 3 in the connector with drive wheels spinning.
6 If meter registers, go to step 7. If not, remove the PM generator from the transmission. Using a digital voltmeter on A/C scale, read voltage accross 2 terminals of the generator while spinning the gear. If meter registers, find open wires from PM generator to the buffer. Repair wiring. If not, replace PM generator.
7 If meter registered in step 5, turn ignition on. Check terminal H of the 8-pin connector at the ht buffer for voltage. If 12 volts is not indicated, go to step 9. If 12 volts is indicated, disconnect the 8-pin connector at the buffer. Use an ohmmeter and check continuity from pin A to ground.
8 If there is continuity measured in step 7 replace buffer.
9 If there was no voltage measured in step 7, find the blown fuse or open wire. Replace or repair as necessary.
Anyone have a Cruise Module in case I need one??
Whew!
please advise.....
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[This message has been edited by MontanaFiero (edited 04-05-2003).]
