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2000 GTP cranks but will not start

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darman1

New member
A friend of mine has a 2000 GTP with about 175,000 miles on it. They have had it for over a year and it has beed trouble free. The other morning when they went to leave work it would not start. I went and checked it and it would crank but it would not start. I checked the fuel pump fuse and it was good. I swapped the #14 and #15 relays with no change. We towed the car to her dad's place and did some more checking. We found no pressue in the fuel rail. Her dad put in a new fuel pump and it still did not start. He tested it and found that there was no power to the fuel pump. He traced that to the #14 relay not energizing. We were working with a general Haynes manual and it appears that there should be power to the #86 leg of the #14 relay from the PCM and there is not. The guy at the parts house suggested we replace the fuel pressure sender as he said that could shut down PCM. We did that with no change. So then we jumped the pos battery leg directly to the pump connection and the pump would now run and the fuel rail pressured up. We left the jumper in place an tried to start the car and it would just crank. We put a sparkplug in one plug wire and cranked it and had fire. I undid the connector at the PCM and found the wire that runs from PCM to the leg of the relay that should be energised and it had .1 ohm resistance. I can see no damage on the harness. The security light on the dash does not flash when car is off. It will come on a little while when key it turned to run position but then goes out. I am unable to take readings with my scan tool. I tried about 10 times and it always says can not make a connection.
I am at a bit of a loss here. Has the PCM failed, is something in the BCM causing an issue? Any help would be appreciated.
 


Replace the cig lighter fuse to make the OBD 2 port work.

Try bending the tab out on the fuel pump relay. And unplug the MAF sensor aswell and see if it starts up and runs.

E3CCEAD.jpg
 
FFDP, thanks for the reply. I'll give this a shot. I did find that someone had put a 30 amp in it and I changed it out to a 15 amp as that is what the fuse panel said it should have. Now I had not tried to run ODB tests after replacing that fuse maybe that 30 amp was blown and that was causing the ODB connection to fail.
 
You can skip the suggestion. It's not the resistor. Reason being is upon key on, the fuel pump is run by the high speed relay. You are getting no fuel pump.

Sounds like your injectors were not the issue, but here's a schem for it anyhow
00GPFuelInj.png


I know it says Regal, same thing pretty much
99FuelPump.gif


99FuelPump2.gif
 
OK, got an injector harness test light and hooked it up and cranked engine. Light did not flash. Tested injector wiring harness and found it has battery voltage on the + side. So that means that the injectors are not getting a signal from the PCM to fire on the negative side. I also don't have a signal at the fuel pump relays from the PCM. Hotwired pump at the fuse block under the hood and it will pump fuel and make pressure in fuel rail. I am ready to take car to dealer to have a reman PCM installed and flashed unless someone else has a bright idea.
 


Even if security is pissed, it should prime the cylinders and start, then after a few seconds, it'll stall.

Double check your grounds etc. Maybe remove the battery connections for 30 minutes to reset things.
 
Have had battery disconnected three different times anywhere from 1 hour to 24 hours and sill get cranks but will not even try to fire.
Everything else is working so I struggle to believe the grounds are the issue. Since the battery grounds to the chassis and the engine grounds seperately to the chassis, all other lights, wipers, work and I have tested several grounds from the PCM connector to the battery ground with good connection I am going to call this one a PCM failure. Car is scheduled to go to a dealership next week four double check and PCM replacement.
 
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