Anyone with instructions on testing the CCRM or troubleshooting electrical wiring?

Discussion in 'Gen 1 & 2 - Electronics & Audio' started by 92ShoOff, Oct 11, 2006.

  1. 92ShoOff

    92ShoOff SHO Member

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    Hey guys I made a post here a few days ago but got no replies. My topic didn't really specify what I wanted so hopefully someone here that has some info what I need can chime in.

    I've had issues before with what I believe is my CCRM? My car wouldn't start in the past due to some faulty wiring that was repaired by a mechanice at the local AAMCO. But when dropping my new motor in I managed to snag a harness of some sort that was connected to the firewall. I may have done some damage there but don't know where to start as far as testing these things goes. I have a 12v test light, voltmeter (or maybe multimeter... I dunno) but I'm not too familiar with electrical testing and need some instructions.

    Does anyone have instructions for test the CCRM or other electronic components that may keep my car from starting? All sensors on my new motor are brand new so that should eliminate a bad CPS, CID, etc. etc.

    It seems like I'm getting fuel at least to the fuel rail, but I'm not sure if the harness I snagged may have ripped wires going to the fuel injectors or anything so if someone can please help me out one how to test this stuff I'd really appreciate it!!!

    Much thanks,
    Andrew Grayson
     
  2. SHOZ123

    SHOZ123 SHO Member

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    Here's an internal schematic of the CCRM. Good luck.

    [​IMG]
     
  3. 92ShoOff

    92ShoOff SHO Member

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    Hey thanks for the schematic. Anyone know how to test this thing though???
     
  4. Off Road SHO

    Off Road SHO Moderator Staff Member

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    Andrew,

    It's difficult to tell you how to test all of the devices in the CCRM. It would be better for you to describe the symptoms and what you've done so far, like you have been doing.

    If I remember correctly, the wiring harness has a couple of plugs under the throttle body that are interchangable. Might try and see if that is applicable on your car. Are there any unplugged connectors near the throttle body? If so, do they look like some that already have mates? If yes, try switching to the unused plugs.

    Tom
     
  5. dantheman68

    dantheman68 Kinda Big deal

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    yeah, i know the coil pack and the MAF sensor connectors are the same...
     
  6. 92ShoOff

    92ShoOff SHO Member

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    Hey again Tom and thanks for yet another reply. Well there IS one connector under the throttle body that isn't connected. Judging by how dirty the inside of the connector is I'd say it was never connected to anything nor is it supposed to be connected to anything, but maybe you guys know for sure. Here is a picture of the gray connector that I'm talking about:

    [​IMG]

    Other than that I don't have any connectors swapped or anything. My coil connector will only reach the coil, and the MAF connector conveniently reaches the MAF, and it's the on the same branch of wires that the ACT sensor plugs into so that means the MAF plug should be connected where it's at now.

    I guess what I need to test out of the CCRM or IRCM is anything that will stop fuel from spraying out the injectors. I dunno if there is anything else that could stop the car from starting but I'm kinda thinking that the injectors aren't firing. I think I might have figured out last night what wires in the plugs that connect the main harness to the injector harness are the ones I need to test the grounds on to see if the ground is being fired to the injectors, so I'll test that tomorrow. Can I also use an incandescent test light, or does it have to be LED? THANKS GUYS!
     
  7. projectSHO89

    projectSHO89 SHOless In St L

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    Leave that connector under the throttle body alone. There are no "extra" or "spare plugs" under there (where did THAT idea come from?).

    Troubleshooting the CCRM is not difficult at all. It's just a simple electronically controlled switch box.

    Four functions:

    1. PCM power. EEC Power relay is switched on by the ignition switch. Output of this relay feeds power to the PCM and also supplies enabling power to the relays in the the rest of the box.

    2. Fuel Pump Power. Relay(s) switch battery power when the PCM grounds the low input side of the coil. Variation includes (89) a two speed control circuit. Later models use the same box but have no dropping resistor and cause the output voltage to be full battery power regardless of which pump control (_FP) signal is an active ground.

    3. Cooling fan control. Low input from the computer energizes relay to supply battery power to the fan. Certain models have two relays, one for low and one for high speed control.

    4. A/C Clutch control. Circuit is activated when power via the mode and pressure cycling switch is supplied to the module. Unless the PCM specifically asserts a disable function (WOT), the clutch relay is energized.

    Once understood, the module can be easily tested in circuit. Just make certain you're using the correct schematic and wiring diagram for your specific vehicle model year and version.

    Steve
     
  8. thecrew2999

    thecrew2999 3.2 MTX SHO

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    that looked like the tps connector
     
  9. 92ShoOff

    92ShoOff SHO Member

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    Actually that connector won't even reach anywhere... it's on a really short branch of wires. I actually have a black colored plug that goes into my TPS. As projectSHO89 said to leave it alone I guess there's nothing that it's supposed to plug into. But then what is this plug for if it's not extra??

    And thanks for the info on the CCRM projectSHO89. I sent you a PM with a few questions about it. Oh and does anyone know what's supposed to attached to that skinny little bolt sticking out the side of my rear cylinder head (to the right of the plug in question)???? Thanks you all!
     
    Last edited: Oct 21, 2006

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