NO START, code 95, ccrm or fuel pump?

[marvsho17]

NO START, code 95, icrm or fuel pump?

My 91 has been running fine up to yesterday. As I go to start the car in the morning, it just cranked. Trying to start it today it would to the same--crank and crank. When I would run the codes I would hear clicking from the engine bay but no priming of the fuel pump.

Today I ran the codes, got 95 and 67.
95 (O) Fuel pump: open, bad ground or always on - Power / Fuel Pump Circuits
(R) AIR not Diverting (AIRD) - Air Injection
(M) Possible bad fuel pump ground or open between fuel pump and pin 8 at PCM (Fuel Pump Monitor signal) - Power / Fuel Pump Circuits

After reading that the description of code 95; I tapped on the icrm box above the radiator. I then tried to start the car, it would almost turn over and start this time. After riding my motorcyle to school the past few 50-60 degree days I'm ready to cut a hole in the rear deck. Are there some grounds to check besides the one on the intake? Or should I just pony up the dough for a new pump?
Thanks in advance.

 

[projectSHO89]

You should check for drive power to the pump at pin 5 of the IRCM module when the pump should be running.

Steve

 

[marvsho17]

I swapped out the ircm with a known good one and no change. I'll be testing pin 5 soon. I did pick up the fuel pump and screen w/ tax for ~77 bucks.

 

[marvsho17]

Okay, so I grounded the fp test pin and I got nothing at pin 5. While grounding the test pin the icrm did do the "clicking." So what now?




(1) Turn the ignition switch to RUN.

(2) Ground the FP TEST pin. This should energize the FP relay in the relay module,
turning on the fuel pump.

(3) If while grounding the FP test pin the pump does not run, then using a multimeter,
measure at pin 5 (PINK/BLACK) of the IRCM/CCRM:

(a) If measurement at pin 5 is battery voltage, go to the trunk and get access to the inertia
switch. Measure both sides of the switch:
- If battery voltage is on both terminals, either there is a wiring fault to the pump or the
pump is defective.
- If voltage is present on only one terminal, the switch is open. Either reset it or replace it
if resetting it does not work.

(b) If no voltage was measured at pin 5 earlier, ground and remove the jumper from the
FP test pin several times while listening for any clicking from the IRCM/CCRM:
- If clicking is heard, either the relay is defective or there is a wiring harness fault in the
FP power supply circuit to pin 12 of the IRCM/CCRM.
- If no clicking is heard, check the 60A fuse "COOLING FAN" in the engine
compartment fuse box.

 

[marvsho17]

Am I measuring the voltage on pin 5 the wrong way? I've been disconnecting the harness from the icrm and grounding out the fp from the self test connector. Then I ground one of the leads from the multimeter and touch the other to pin 5. Is this the wrong way?

 

[SlowHeavyObject]

i had the same problem. came out of tower records one day and would keep cranking but wouldn't turn over. also had no sound from pump when key put to run. also got the same exact code 95 but not the 67. i replaced the fuel pump and all was fine. since you got the clicking i don't think it's a fault with the wiring. sounds like you're doing all the tests correctly. i replaced mine with a walbro for about $200 altogether.

 

[marvsho17]

Yeah, I might just end up replacing the pump. I would like to rule out everything else though before the pump is unreturnable. BTW, O'reillys ftw.

 

[projectSHO89]

Am I measuring the voltage on pin 5 the wrong way? ...Is this the wrong way?

Yes. You have to make the check with the IRCM connected and in-ciruit. It is necessary to "backprobe" the wire/pin to make your reading.

If the IRCM is disconnected, there should never be any power on pin 5 since that's an output of the module.

Steve