Fuel injectors misbehaving

[V6Hova]

In order to check if you are getting electricity to the injector you have to take off the manifold, right? It seems i'm not getting 12v at any of the injectors in the key on position. Am i missing something? I put a meter in the wire harness and I'm getting nothing. ALso no fuel from any of the injectors.Could it be a bad EEC? Any one have any clues for someone who has had his SHO in the garage for longer than it's been on the road. frown

 

[SHOPWR]

yes, take the intake plenum off and use a "noid light" on each injector and if it lights its good.if you pull an injector out and put your finger under it and theres gas leaking out from the injector, its bad. and how do you know your not getting fuel from the injectors ?you could check your fuel pump shut off switch in the trunk and make sure that it is not off. and if you dont have any fuel to the injectors possibly your fuel pump, maybe your fuel pump relay is bad. it could be many things.

 

[projectSHO89]

All six RED wires to the injectors should have Vbatt when the ignition is turned to RUN or START. The other wire of each injector is grounded by the PCM to fire the injector.

If you do not have battery voltage, check back to pin 24 on the CCRM. If the correct voltage is present there, you have an open circuit in the wiring harness. If the voltage is incorrect, there is most likely a failure of the PCM B+ relay in the relay module. This same feed line also supplies power to the IAC, IMRC, MAF sensor, CANP valve, and the PCM. You can also check the red wire on each of these to see if the circuit has power.

Steve

 

[Off Road SHO]

Like Steve said, the 12 volts supplied to the injectors is common to alot of other things. The easy way is to pull the plug off of the MAF sensor and check for 12 volts on the red wire pin. If you have it there, more than likely you have it to the injectors.

If you don't, check fuse 1 I believe, it's a little 10 amp in the underhood power box (one of only two little red 10 amp fuses in there).

Tom

<small>[ November 14, 2003, 10:14 AM: Message edited by: Off Road SHO ]</small>

 

[projectSHO89]

The 10A fuse in the EC fusebox provides 12V to CCRM pin 13 and is used to supply power to the EEC POWER relay coil in the CCRM. If it opens, that relay in the CCRM will not energize. That circuit should be HOT in RUN or START.

Include it in your checks as Tom suggested.

The power that is routed through the normally open contacts of the EEC power is supplied to pin 24 via the COOLING FAN fuse in the same fusebox.

Steve