Check engine light help needed
Thread Starter
Junior Member
Joined: Jul 2010
Posts: 18
Likes: 0
Check engine light help needed
My check engine light does not work at all. Cannot pull any error codes from the ecm. Turn the key to the run position and no check engine light. Any idea how I can go about fixing this issue?
Thread Starter
Junior Member
Joined: Jul 2010
Posts: 18
Likes: 0
Supreme Member
Joined: Jan 2006
Posts: 3,341
Likes: 10
From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Check This Out !
With the ignition OFF disconnect the ECM.
Using a fused jumper (1 amp is good) ground pin A5 of the connector (not the ECM).
Now, turn the key to the RUN position.
Does the Service Engine Soon light come on now?
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Make Noise, Turn Left, Repeat
.
Using a fused jumper (1 amp is good) ground pin A5 of the connector (not the ECM).
Now, turn the key to the RUN position.
Does the Service Engine Soon light come on now?
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Make Noise, Turn Left, Repeat
.
Trending Topics
Supreme Member
Joined: Jan 2006
Posts: 3,341
Likes: 10
From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Check This Out !
When I disconnected the ecm I undid both connectors, was this the correct thing to do?
The purpose of disconnecting the connector(s) was to prevent damage to the ECM from voltage being applied to the wrong place when you were probing A5.
Due to the fact the Service Engine Soon did not illuminate when you grounded A5 of the connector means there is a break in the connection to the bulb.
The break might be in the wiring, connector, or PCB trace (difficult to see).
With the ECM still disconnected, remove the Service Engine Soon bulb, then turn the key to RUN.
Now using a voltmeter or test light (the type for testing for voltage, not a continuity tester) probe the bulb socket.
One side must have power.
Turn the key to OFF, then remove the bulb, and grab an ohmmeter.
Probe the other side of the socket with one of the ohmmeter leads, and the other lead to A5 of the disconnected ECM connector.
There should be one ohm or less in that circuit.
What are your results?
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Engines Run Best Right Before They Blow Up
.
Supreme Member
Joined: Sep 2002
Posts: 9,192
Likes: 19
From: Cary, North Carolina
Car: 1992 RS
Engine: Carbed 350
Transmission: 700R4
Axle/Gears: 3.42 posi
Thread Starter
Junior Member
Joined: Jul 2010
Posts: 18
Likes: 0
Re: Check This Out !
Problem finally solved. Now that the problem is fixed I feel quite stupid, lol. Turns out someone had removed the bulb and socket and put it into a differant place, then taped over the spot for the check engine light.
So I removed the tape, placed the light in the correct spot and now it works like it should. And to top it all of no error codes.
3 weekends trying to sovle this and turns out to be something stupidly simple.
Anyways thanks for the help guys.
So I removed the tape, placed the light in the correct spot and now it works like it should. And to top it all of no error codes.
3 weekends trying to sovle this and turns out to be something stupidly simple.
Anyways thanks for the help guys.
Thread
Thread Starter
Forum
Replies
Last Post
