Can you provide a wiring diagram of the circuts controlled by Quad Drive Module 1?

  • 1995 OLDSMOBILE 88
  • 150,000 MILES
This car runs very poorly. Rough idle extremely poor acceleration and misfire.

Replaced spark plugs and ignition wires. Replaced fuel filter and checked fuel pressure, 41 psi.

Attached scan tool & got 2 codes: 341 intermitent cam sensor / 640 QDM 1 fault. Have cleared them several times and keep getting these 2 codes.

I replaced the cam sensor. No improvement.

I checked the ignition coils for resistance and had approx 6800 ohms on all 3. I checked the voltage to the coils on the ICM pins all have 3 are getting battery voltage with key on. I cleaned the mounting surfaces on the ICM and the plate it mounts to on the engine. I need to know the outputs of QDM 1 so I can make sure I don't have a shorted componet or wires before I attempt to replace the ECM.

Note: Problem seems to get worse as engine temp rises.

Please provide wiring diagram if possible. Include any additional advice you think would help me out.

Thank You !
kenneth E. Smith
Do you
have the same problem?
Sunday, July 15th, 2012 AT 7:21 PM

1 Reply

Quad drivers are in the computer which controls all fuel controls.

Clearing the codes does nothing as the problem will still be there. When the problem is repaired, the light will go out on its own.

Most likely have a computer malfunction but you need to check the module, coils and all secondary parts. This test is best done by a shop with a scan tool.

Was this
Sunday, July 15th, 2012 AT 7:31 PM

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