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Working backwards Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Tue, 2 May 2006 06:23:03
In Reply to: 92 900s live power but not to starter, Mike W, Mon, 1 May 2006 09:57:14 Members do not see ads below this line. - Help Keep This Site Online - Signup |
A good troubleshooting technique.
I'm at a slight disadvantage, and I don't have a late model convertable handy, so I'm going by my somewhat thin documentation.
Step 1 - Make sure you have 12 volts (measured with respect to chassis) from the battery right on the starter - that's the big fat red wire on the starter. It should be there with the ignition off. While still monitoring that point, try and start the car. If it remains at 12 volts, continue. If the voltage drops way down at that point, then there is a problem with that fat cable between the battery and the starter.
Step 1A - take a piece of wire and connect it to the yellow wire on the back of the starter. MAKE SURE THE CAR IS IN PARK AND THE BRAKE IS SET. Touch it to the the wire to the positive battery lead. The starter should turn. If not, the starter is bad (yes, I know it was checked), or it has a bad ground. If it does turn, go to step 2.
Step 2 - Measure the voltage on the starter start wire (yellow). It should be 0 volts with the ignition not in the Start position. It should go to 12 volts (or so) with the ignition at START. If it goes to 12 volts, the starter is bad. If it remains at 0 volts in START, continue to 3.
Note: This starter signal should be available on pin 3 of the Test Connector in the engine compartment.
Step 3 - Not quite working backwards, but easy to get to. Measure the voltage on the yellow/yellow-red wire at the shift interlock. It should be 0 when the key isn't in START, and should go to 12 volts in the START position. If not, I'd suspect the ignition switch. If it switches between 0 and 12, go to Step 4.
Step 4 - At this point I'd say go to the Starter Interlock relay, which is SUPPOSED to be under the rear seat, on the passenger side. Since it isn't there, either someone has changed the alarm system around, or my documentation is wrong. Both are possible. So all I can say is that if you've gotten this far in the troubleshooting, all that lies in the middle is that darn Sterter Interlock relay, and you've got to find it.
I would say to try to trace the yellow-red wire from the Shift Interlock switch. Since that probably almost immediately dives into a cable harness, it would be a challenge. Basically, that wire should go to a relay somewhere, one with two yellow-red wires on it. One of those yellow-red wires is spliced to the yellow wire that goes to the starter.
Alternatively, you could simply jumper the yellow-red wire from the shift interlock directly to the yellow wire on the back of the starter. You'd lose the alarm disable, but still have the Shift interlock (a nice touch). And your car should work.
But it all pretty much boils down to finding that relay. It's possible the system was modified by a previous owner, and that 'fix' has now gone awry.
posted by 192.249....
, Tue, 2 May 2006 06:23:03 <-- Viewing This Message, Mon, 1 May 2006 10:19:03, Mon, 1 May 2006 12:07:07
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