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check engine 2003 grand marquis

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dschnit 
Member - Posts: 2
Member spacespace
Joined: November 15, 2002
Location: United States
Posted: December 22, 2002 at 5:16 AM / IP Logged  

 i having a problem with the check engine light coming on. Even with he heater,acc wires on ing. Does anybody have an idea why.

radsta 
Member - Posts: 42
Member spacespace
Joined: October 18, 2002
Location: United States
Posted: December 22, 2002 at 9:09 AM / IP Logged  
Hey- does the car have multiple acc wires ? They may all need to be hooked up. Also, you may have a wire turned on during crank that should drop out instead. just a Guess, Steve
Velocity Motors 
Moderator - Posts: 12,488
Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Fabrication. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: March 08, 2002
Location: Manitoba, Canada
Posted: December 24, 2002 at 11:55 PM / IP Logged  

Here is a wiring diagram for this car:

|              12V|brown & lt. green   |+  |ignition harness            |

|          STARTER|WHITE/ pink          |+  |ignition harness            |
|         IGNITION|BROWN / pink          |+  |ignition harness            |
|  SECOND IGNITION|gray / YELLOW         |+  |ignition harness            |
|        ACCESSORY|BLACK/ lt. green     |+  |ignition harness            |
| SECOND ACCESSORY|pink/black          |+  |ignition harness            |
|       POWER LOCK|pink / YELLOW         |*1 |drivers door harness        |
|     POWER UNLOCK|pink/green          |*1 |drivers door harness        |
|       LOCK MOTOR|pink/black          |+  |drivers door harness        |
|     UNLOCK MOTOR|RED / orange          |+  |in drivers door             |
|    DISARM DEFEAT|pink/orange         |+  |drivers door harness        |
| PARKING LIGHTS +|brown               |   |LCM *2                      |
|       HEADLIGHTS|RED / yellow          |+  |LCM *2                      |
|     DOOR TRIGGER|*3                  |-  |LCM *2                      |
| DOME SUPERVISION|BLACK/ lt. blue      |+  |LCM *2                      |
|  TRUNK/HATCH PIN|BROWN / white         |-  |LCM *2                      |
|TRNK/HTCH RELEASE|purple / YELLOW       |5wi|drivers door harness        |
|       TACHOMETER|WHITE/ pink          |   |PCM *4                      |
|      SPEED SENSE|gray/black          |   |PCM *4                      |
|       BRAKE WIRE|lt. green           |+  |stop light switch           |
|     HORN TRIGGER|dk. blue            |-  |LCM *2                      |
|           WIPERS|dk. blue & white    |   |wiper motor *5              |
|  LF WINDOW UP/DN|yellow - wht/blk    |A  |drivers door motor          |
|  RF WINDOW UP/DN|wht/yel - tan/lt.blu|A  |drivers door harness        |
|  LR WINDOW UP/DN|gry/orn - yel/lt.blu|A  |drivers door harness        |
|  RR WINDOW UP/DN|RED / blk - yel/blk   |A  |drivers door harness        |
|        RADIO 12V|PURPLE / lt. blue     |+  |radio                       |
|     RADIO GROUND|black               |-  |radio                       |
|     RADIO SWITCH|yellow/black        |+  |radio                       |
| RADIO ILLUMINATE|lt. blue/red        |+  |radio                       |
|       LF SPEAKER|orn/grn - blu/wht   |   |radio or speaker            |
|       RF SPEAKER|wht/grn - grn/orn   |   |radio or speaker            |
|       LR SPEAKER|tan/yel - gry/blu   |   |radio or speaker            |
|       RR SPEAKER|brn/pnk - orn/red   |   |radio or speaker            |

Notes:

NOTE:  This vehicle has the PATS (passive anti-theft system) installed.  It must be bypassed when adding a remote start module.   *1 The door locks are positive trigger if equipped with factory keyless entry, and are 5 wire on all other models.   *2 The LCM is located to the passenger side of the steering column.  The harness is accessable between the steering column and the LCM.   *3 There is a dk. blue for the drivers door and BLACK/ orange for the other three doors.  Use both wires and diode isolate each one.   *4 The PCM is located under the hood to the drivers side of the brake master cylinder.  *5 The wiper motor is located just above the brake master cylinder.

Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Chris Luongo 
Platinum - Posts: 3,746
Platinum spaceThis member consistently provides reliable informationspace
Joined: May 21, 2002
Location: Massachusetts, United States
Posted: December 25, 2002 at 2:10 PM / IP Logged  

Get the dash down, and your meter/test light ready.

Do NOT insert the key---just remote start the car, and leave it running.

Test all of the wires coming from the ignition switch----make a note of any of these wires that do not have power.

Turn the remote start off, insert the key, and TEST each of these wires you found, to determine its function----radio-accessory, heater-accessory, ignition, or starter.

Hook up your remote start to one of these suspect wires, and remote start the car again-------if all your warning lights are off, you're all set.  If the warning light is still on, try powering up a different wire instead.

I've done a few Grand Marquis, and I've found that the radio wire does not need power----and I wouldn't want my radio to come blasting on when I remote start the car in the morning anyway.  \

But that other "second accessory" wire---the pink/black one--- is smaller than all the others, and easy to miss.  And if you don't power it during remote start, the airbag light comes on (not the check engine).  Still, though, double-check that you got that wire.


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