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Car Computer ECM Questions and Answers - This category
contains featured questions as examples. They relate to most vehicles.
Question: 1988 Pontiac Bonneville mileage: 103,000.
Starting problem when ambient temperature below 0 degrees C. Error code 43 (ESC).
This module replaced. OK for couple of days. Then again, code 43 (ESC).
What should be done next?
Answer: Code 43 is knock sensor - replacing it should fix
your problem.
Question: 1989 Buick Century mileage: 82,000. I am having some trouble
with my car. The problem occurred suddenly. The car starts and runs
fine until about 15-20 minutes into the drive, then it just shuts off. After
about a 5-10 min wait it fires right back up. Then after another short drive
it shuts down again. Then it repeats the process. I found that when
it shuts down I lose spark. The ignition coils check out o.k. In addition,
I still have power to the ignition module so I changed the module, the problem still
exists. I looked at the engine-wiring diagram and found two temperatures.
Sensors 1 runs the fan (which seems to cycle o.k.) the other sends a signal to
the temperature gauge and to the ECM. I am guessing the problem is temperature
related, so I changed the temperature sensor and the problem still exists.
I got three codes from the computer. 12, which I think, is a gm computer.
Test code 21, I do not know and 42, I do not know. I am pulling out my hair
on this one (what little I have left) are all these sensors really needed.
Cars used to run fine without them. I hope you can help. Thank you.
Answer: Your code 21 is TPS (Throttle Position Sensor), which
means your signal voltage is high. Code 42 is EST (Electronic Spark Timing),
which means your circuit is either open or grounded.
Question: 1988 Ford Thunderbird 2.3l mileage: 106,000.
My spark plugs, cap, wires, and rotor were changed and the timing was done with
a timing gun. My car lacks power, the turbo psi comes on sometimes and the
gas pedal is hard to press. As soon as the car warms up it does not do this,
but it still will not take off fast when at a standstill, it takes awhile to pick
up speed. The timing was set at 30 BTC and started right, now it is at 10
BTC and is hard to start. The engine light comes on after driving for a while.
The codes I get are 42 and 14.
Answer: Code 14 is erratic ignition signal for PIP.
Code 42 is heated exhaust oxygen sensor too rich. You might want to check
the fuel pressure regulator; it may be faulty.
Question: 1985 2500 Chevy Silverado turbo diesel mileage:
55,000 km. Engine stalls when traveling. This happens occasionally.
When engine stalls, pull over and turn ignition off. I then turn ignition
on and start the vehicle and proceed to drive away. Occasionally I will only
put transmission in neutral when stall occurs, restart engine, and continue.
There has been no problem-starting engine at any time. The trouble codes come
out as 35, 36, 39, 68, 78; there is no code 12. Hope you can be of assistance.
Answer: Code 35 is injector pulse with error (short).
Code 36 is injector pulse with error (long). Code 39 is TCC stuck off
(transmission). Code 68 is overdrive ratio error. Code 78 is waste
gate solenoid fault.
Question: 1989 Dodge Caravan mileage: 104,000. I have a code 12.
Any ideas?
Answer: Code 12 merely means that you are ready to access the computer.
Question: 1989 Lincoln Towncar mileage: 121,000. What does trouble
code 34 indicate?
Answer: Code 34 indicates the EGR valve positing sensor voltage
is above closed limits.
Question: 1989 Chevy Cavalier mileage: 103,000. 5-speed. When traveling
in residential areas or where slow speed is required, the car starts shaking violently.
This occurs whenever I try to maintain speed around 25 MPH (second gear).
Above this speed the shaking stops. Below 25 MPH, it does not shake either.
When idling, the car has a noticeable smoky exhaust. I was inspecting the
tail pipe and noticed a carbon powder build up around the end of the pipe.
I have so far replaced the Idle Speed Sensor and Throttle Positioning Motor.
I bought an oxygen sensor and have not yet installed it. I am not sure what
else to do. The plugs and wires were recently replaced. I use premium
oil when I change the oil (about every 5000 miles). I pinged the ECM and got
trouble codes 22, 35, and 44, but I am not sure what they mean. Any suggestions
would be most helpful.
Answer: Code 22 is - low TPS voltage. Code 35 is IAC
speed error. Code 44 is lean exhaust. With 103,000 miles, a compression
check would be a good idea also.
Question: 1989 Dodge Caravan mileage: 108,000. Does anyone
know what engine code 32 means?
Answer: Code 32 is low speed fan control relay circuit. Check
The fan control module.
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