ECU test connector- '87 GL 10 turbo wagon

[Andy FitzGibbon]

Where's the green test connector on an '87 GL 10 turbo? It's not under the hood like my later cars. I found a green plug under the ECU that I thought was it, but when I connect it the check engine light does not come on like the FSM says it will.

Thanks,

Andy

[Turbone]

Look by the drivers side strut tower and firewall.

[Gloyale]

Where's the green test connector on an '87 GL 10 turbo? It's not under the hood like my later cars. I found a green plug under the ECU that I thought was it, but when I connect it the check engine light does not come on like the FSM says it will.

Thanks,

Andy

 

Green plugs under the ECU.

 

Connect them and you should here the fuel pump cycle with the key *on*/ eng off. Check engine light should flash in time with the fuel pump.

 

Once you turn the engine on the light will go out until:

 

Engine is warm

 

rev over 2000 rpms for 40 seconds

 

drive over 2 mph.

 

 

 

After that the check engine light will either come on steady (code present) or start blinking (all good)

[Andy FitzGibbon]

Green plugs under the ECU.

 

Connect them and you should here the fuel pump cycle with the key *on*/ eng off. Check engine light should flash in time with the fuel pump.

 

Once you turn the engine on the light will go out until:

 

Engine is warm

 

rev over 2000 rpms for 40 seconds

 

drive over 2 mph.

 

 

 

After that the check engine light will either come on steady (code present) or start blinking (all good)

 

That's the one I plugged in, the one under the ECU. I did hear the fuel pump cycling differently than usual with the key on, but I don't remember seeing the CEL flashing. Maybe I just didn't notice it. I will try again and see if I get anything.

Thanks,

Andy

[Andy FitzGibbon]

Tried it again- with the test connector plugged in the fuel pump cycles constantly, but the CEL does not flash (just stays solid like any other time the key is turned to the "on" position).

Andy

[Gloyale]

Are the black *read* connectors in the same area also plugged in?

 

If they are hooked up, along with the green *test* connectors the ECU will be in "clear memory mode" in which case, a solid CEL would indicate a persistant code, unable to clear.

 

Try again, making sure the car is warm first.

 

Make sure the black test connectors are unplugged.

 

Plug in just the greens

 

Key on/eng off = Flashing CEL/fuel pump

 

Start engine, CEL should go out but eventually flash.

 

At any rate, now read the LED light on the ECU for codes.

[Andy FitzGibbon]

The read connectors aren't connected.

The CEL is not on during normal driving. The only reason I am messing with it is that I was surprised that it didn't turn on when I connected the test connector to do the timing.

I will mess with it more when I get home. I will have to pull it outside and let it warm up (big hole in the exhaust, don't want to smoke out the upstairs tenants).

Thanks,

Andy

 

Are the black *read* connectors in the same area also plugged in?

 

If they are hooked up, along with the green *test* connectors the ECU will be in "clear memory mode" in which case, a solid CEL would indicate a persistant code, unable to clear.

 

Try again, making sure the car is warm first.

 

Make sure the black test connectors are unplugged.

 

Plug in just the greens

 

Key on/eng off = Flashing CEL/fuel pump

 

Start engine, CEL should go out but eventually flash.

 

At any rate, now read the LED light on the ECU for codes.