Electronic control unit problems

Electronic control unit: Engine Control Unit. It regulates all the aspects related to the engine's proper functioning.
Read more
Related problems:

Top problems

Fuel pump relay not powering up from PCM SolvedSolved

Chevrolet Camaro 1995 5.7 LT1 199999 miles
No start, no fuel pump or its relay power.
Could be security system issue or pcm
Key was missing. Chipped key was remade... hoping its programmed correctly.
Could be a pcm issue otherwise. Fuel pump relay wont power up.
LeeLee from United States 7 months ago  
LE
Rank 2
1 reply 
Solved
Best answer (according to LeeLee)
LeeLee from United States 7 months ago
Solved the issue of the pcm (computer) not triggering the fuel pump relay, so the relay will fwd the 12v power to the fuel pump. Upon inspection of the underhood wiring harness I found where the small dark green, wht striped wire was broken... but really, 3-4 inches of it was missing. Couldve been sabotage, or rodent chewed and took a piece of the wire.
Progress, tho the vehicle still isnt repaired. Now i must repair the fuel pump itself. It was done improperly... so i am doing rework and repairing the fuel sending unit simulateously. Fuel gauge on dash board also did not work. Gauge problem is common in these cars from what ive read... I would say its a problem in the fuel sending unit (in the tank) most likely. The tank itself is not easy to remove... rear differential and exhaust must be dropped, unless an access door is cut in the inner body of the car... above the fuel pump (Take All Precautions if youre cutting with a grinder, or will create any sparks)
Comment

Starts and stalls

Chevrolet Camaro 1995  15000 miles
Good afternoon, I have a Camaro 95 v6 3.4 and my problem is that, when starting the engine, it stalls. I've already changed the ignition key as, at the beginning, the security appeared on the dashboard. After changing it, the indicator continued appearing, so the orange wire coming from the ignition cylinder was disconnected and a resistance of the same voltage was installed, but still no change. New coils and their plates were installed and even the fuel pump, filters and spark plugs were replaced, but without any positive results. I really don't know what can be happening. Thanks for your help.
berry from United States 11 years ago  
BE
2 replies 
Ode from United States 11 years ago
Hi, have you checked the starter? And the crankshaft sensor?
Ode from United States 11 years ago
If you say that the security appeared it means that the alarm was activated, so I recommend you to take the car to an electrician and make him disconnect the wire. Remove the battery so that the computer resets. I recommend you to do this before buying the crankshaft sensor.
Comment

Engine and Transmission Problems

Chevrolet Camaro 2011 V6, 3.6L LFX 80000 miles
Hello together, I owned a Chevrolet Camaro in September 2022 and just got problems over problems since February 2023. I hears unusal noises, coming out of my engine. I thought it would be a connecting rod bearing damage. Nobody wanted to fix the engine. After weeks of search, i just found a workshop who want to fix it. The workshop replaced my timing chain, cause they thought it will solve the problem. After picking up my car and driving only like 20 miles, the car wouldnt start anymore. After that the workshop find out that the crankshaft is broken and i also got a connecting rod bearing d… Read complete
Robiinnn25 from other 2 years ago  
RO
1 report 

1994 c28 Camaro Chevrolet 5.7 V8 LT1 won't crank won't start

Chevrolet Camaro 1994 Z28 Camaro5.7 l , V8 Lt1  95000 miles
This car in sit for some time like 7 years and I've been working on it I put ignition coil ignition coil module spark plugs battery fuel pump assembly the whole thing fuel pressure regulator bypass module. It was turning over just turning over over and over and over now no crank no crank up I had the bypass running through the relays I guess the theft deterrent on the right hand side of the seat passenger seat then I grounded the black yellow wire and crank up and run still shut off maybe after 15 minutes. My son was going to try to jumper off the ignition switch to see if it would run but it… Read complete
94Z28Camaro5.7 lt1 from United States 2 years ago  
94
Problems with a Camaro? Share them
Submit commentCancel
Submit replyCancel


Find what you needed?

Thank you!