Code 34 problems
Thread Starter
Instructor
Joined: Dec 2009
Posts: 107
Likes: 0
From: Bowmanville ont
Code 34 problems
I am really chasing alot of stuff with this car and am ready to park/burn it.Today I have a code 34.I say today because every day it is something different.I have changed the MAF relays and no luck.I checked voltage on the connector(of the mass air sens) and the one pole I got 4.8 volts.Nothing on any of the other poles.I should see 12v somewhere,shouldn't I ?The car is an 88 model.
Racer
Joined: Aug 2009
Posts: 289
Likes: 1
From: Tucson Arizona
So what codes do you see on other days?
According to my 1986 FSM (not sure if 1988 is the same) the ECM provides a 5 volt signal on the signal line (CKT 998, dark green wire, pin C at the MAF). The MAF power relay provides 12 volts to the MAF at pin E (purple wire, CKT 993).
Re-inspect you wiring and connections to the MAF relays. You may have gotten a bad relay. Try checking relay operation out of the car with a power supply and multi-meter.
Steve
According to my 1986 FSM (not sure if 1988 is the same) the ECM provides a 5 volt signal on the signal line (CKT 998, dark green wire, pin C at the MAF). The MAF power relay provides 12 volts to the MAF at pin E (purple wire, CKT 993).
Re-inspect you wiring and connections to the MAF relays. You may have gotten a bad relay. Try checking relay operation out of the car with a power supply and multi-meter.
Steve
Team Owner
Joined: Jan 2003
Posts: 20,293
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From: Summerland B.C. Canada
Thread Starter
Instructor
Joined: Dec 2009
Posts: 107
Likes: 0
From: Bowmanville ont
Help!
Yesterday I had a code 34.Today I cleaned the MAF and I got a code 33.The car won't idle,and is running verry rich.With the MAF plugged in or not the car runs the same.I will check voltages with key on/no start and see what I find.Does anyone have any other sugestions?This thing is driving me bonkers!
Racer
Joined: Aug 2009
Posts: 289
Likes: 1
From: Tucson Arizona
Yesterday I had a code 34.Today I cleaned the MAF and I got a code 33.The car won't idle,and is running verry rich.With the MAF plugged in or not the car runs the same.I will check voltages with key on/no start and see what I find.Does anyone have any other sugestions?This thing is driving me bonkers!
Steve
