FC S4 NA Changed Alternator Now Won't Start
04-21-12, 05:11 PM
#26
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Narrowed it down - not getting fuel from the fuel pump. Tried the jumper and still nothing. Is there a fuel shutdown / reset button on this thing?
04-21-12, 06:06 PM
#28
The Circuit Opening Relay powers the fuel pump. It is Yellow and Black and located under the dash and just to the right of the steering column. There are five wires in the relay plug with three of them on the top row. Far left spot (Black/Red on autos otherwise B/W) has voltage w/key to start. No voltage here and the pump will not turn on. The center position wire (Black/White) has voltage w/key to on. No voltage here and the pump dies immediately after starting. In either case, the Blue wire (far right spot) will have voltage when the relay is working properly, and this Blue wire powers the pump.
04-22-12, 10:43 AM
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The Circuit Opening Relay powers the fuel pump. It is Yellow and Black and located under the dash and just to the right of the steering column. There are five wires in the relay plug with three of them on the top row. Far left spot (Black/Red on autos otherwise B/W) has voltage w/key to start. No voltage here and the pump will not turn on. The center position wire (Black/White) has voltage w/key to on. No voltage here and the pump dies immediately after starting. In either case, the Blue wire (far right spot) will have voltage when the relay is working properly, and this Blue wire powers the pump.
04-22-12, 01:30 PM
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The Circuit Opening Relay powers the fuel pump. It is Yellow and Black and located under the dash and just to the right of the steering column. There are five wires in the relay plug with three of them on the top row. Far left spot (Black/Red on autos otherwise B/W) has voltage w/key to start. No voltage here and the pump will not turn on. The center position wire (Black/White) has voltage w/key to on. No voltage here and the pump dies immediately after starting. In either case, the Blue wire (far right spot) will have voltage when the relay is working properly, and this Blue wire powers the pump.
04-22-12, 01:42 PM
#31
The B/W wire should have voltage w/key to on. This wire is powered by the "15 amp Engine fuse." This fuse powers the B/W wire found at the back of the alternator and the B/W wire found in the two wire plug at the Main Relay as well.
If the Main Relay clicks w/key to on then the fuse is good. And that's the Main Relay clicking "and not" the Starter Cut Relay.
If the Main Relay clicks w/key to on then the fuse is good. And that's the Main Relay clicking "and not" the Starter Cut Relay.
04-22-12, 02:42 PM
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The B/W wire should have voltage w/key to on. This wire is powered by the "15 amp Engine fuse." This fuse powers the B/W wire found at the back of the alternator and the B/W wire found in the two wire plug at the Main Relay as well.
If the Main Relay clicks w/key to on then the fuse is good. And that's the Main Relay clicking "and not" the Starter Cut Relay.
If the Main Relay clicks w/key to on then the fuse is good. And that's the Main Relay clicking "and not" the Starter Cut Relay.
04-22-12, 03:12 PM
#35
With key to on, the reading of the Blue wire is normal. The reading w/key to start on the Blue wire is not normal as it should read basically the same voltage as the B/R wire has w/key to start. It appears the relay is faulty or the solid Black wire in the bottom row far left position of this relay, which should be a constant ground, is not grounded properly. You could jumper a ground wire to the solid Black wire in the relay plug to see if the fault lies within the wire or the relay. So jumper a ground to this bottom row far left position wire and w/key to start try taking another reading on the Blue wire.
04-22-12, 03:34 PM
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With key to on, the reading of the Blue wire is normal. The reading w/key to start on the Blue wire is not normal as it should read basically the same voltage as the B/R wire has w/key to start. It appears the relay is faulty or the solid Black wire in the bottom row far left position of this relay, which should be a constant ground, is not grounded properly. You could jumper a ground wire to the solid Black wire in the relay plug to see if the fault lies within the wire or the relay. So jumper a ground to this bottom row far left position wire and w/key to start try taking another reading on the Blue wire.
04-23-12, 03:50 PM
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Spoke to soon - not 100% that this car has a Fuel Pump Relay & Resistor. It is not on the wiring diagram. Best to just rewire the fuel pump?
04-23-12, 04:33 PM
#41
You stated the Black ground wire in that relay was solid. Not sure how you checked, but if you used the Black wire as the ground source for the multimeter when measuring for voltage on the top row center wire (Black/White) w/key to on and if you get the same reading as before,12 volts, then the Black ground is good thus the problem is the relay itself.
04-23-12, 04:39 PM
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You stated the Black ground wire in that relay was solid. Not sure how you checked, but if you used the Black wire as the ground source for the multimeter when measuring for voltage on the top row center wire (Black/White) w/key to on and if you get the same reading as before,12 volts, then the Black ground is good thus the problem is the relay itself.
On a side note, a jumper on Yellow two prong by the passenger strut tower did absolutely nothing.
04-23-12, 04:45 PM
#43
Then the relay is your problem. If you look at the diagram you provided the wire that goes to the relay at the top left of the pic shows the wire that provides voltage to the relay w/key to start and yours was about 7 to 8 volts. The Black wire at the bottom of the diagram feed the ground for the coil involved. When both these elements are present the relay closes and the voltage from the B/W wire is able to pass on to the Blue wire. You said you had a quarter of a volt when this happened.
04-23-12, 04:51 PM
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Then the relay is your problem. If you look at the diagram you provided the wire that goes to the relay at the top left of the pic shows the wire that provides voltage to the relay w/key to start and yours was about 7 to 8 volts. The Black wire at the bottom of the diagram feed the ground for the coil involved. When both these elements are present the relay closes and the voltage from the B/W wire is able to pass on to the Blue wire. You said you had a quarter of a volt when this happened.
Key to on was one tenth of a volt.
04-23-12, 04:55 PM
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Is there a way to bypass this temporarily? I would imagine that a constant 12v to the pump would deliver more fuel than the engine could burn and flood. Could be wrong...idk.
04-23-12, 04:58 PM
#46
The important number is the key to start. The relay requires the car to start for the AFM to supply a ground to the other coil located within the same relay. Since your car is not running you have no ground on the Brown wire and thus the relay does not close which is why the voltage off of the B/W wire does not pass onto the Blue wire so this is normal as can be, but the voltage on the Blue wire w/key to start is the problem w/the relay.
04-23-12, 05:09 PM
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That could be the battery for sure. FYI - New alternator is hooked up but the battery is probably toast, or really drained. Will make sure battery is good and retry.
04-23-12, 06:33 PM
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Park to Reverse dies.
Park to Drive dies.
Park to Neutral runs, and then Neutral to Drive or Neutral to Reverse stays running.
When it was a 'cold' pressing the brake killed it.
Let it warm up for 2-3 minutes and pressing the brake did not kill it.
BAC needs cleaning, idle adjustment and/or weak tranny...?
Getting about 13.9v at battery right now while running.