Can a PCM operate without a good ground?
The PCM can’t operate properly if it does not have a good source of power and a good ground. This video shows how to test both. PCM power and ground testing. The PCM can’t operate properly if it does not have a good source of power and a good ground. This video shows how to test both. Skip navigation Sign in Search Loading… Close
How can I tell if my PCM is faulty?
You need to check the sensors that are connected to your PCM, as well as the wires that connect them. If you’re seeing a PCM code – or two, or three – it can really help you narrow in on which sensors or wires are faulty.
How to test a PCM in a car?
How to Test a PCM. 1 Step 1: Visual Inspection. Now, before you start doing any surgery on your car, the first thing to do is to check for rust or a disconnected wire. 2 Step 2: Check Your Battery. 3 Step 3: Code Scanning. 4 Step 4: Inspect Wiring and Sensors. 5 Step 5: Try a Replacement.
What to do if your PCM has rust on it?
Make sure that your PCM is connected to your battery, and that there’s no rust on the PCM itself or on the battery wiring. Reconnect any loose wires if necessary. If your PCM has experienced corrosion, you’ll have to skip to step 5 to see if it’s failed.
How can I Check my ECM ground circuit?
Disconnect the ECM harness connectors. Using a 12-volt test light connected to 12-volts, check each of the ECM ground circuits in ECM harness connector. Did the test light illuminate for each cavity?
The PCM can’t operate properly if it does not have a good source of power and a good ground. This video shows how to test both. PCM power and ground testing. The PCM can’t operate properly if it does not have a good source of power and a good ground. This video shows how to test both. Skip navigation Sign in Search Loading… Close
You need to check the sensors that are connected to your PCM, as well as the wires that connect them. If you’re seeing a PCM code – or two, or three – it can really help you narrow in on which sensors or wires are faulty.
What to do if your ECM is not working?
If your car seems to run fine but the Check Engine light won’t turn off, your ECM may be at fault. The only way to be sure is to visit a mechanic with the proper computer. They can analyze your vehicle’s error codes, and let you know exactly what the problem is.
Why does my 98 Bonneville stall while driving?
My 98 bonneville has frequently been stalling on me. It mostly happens when I first start the car up, or when I put the car in park after driving. But this week it happened to me while I was driving.
Can a bad ignition switch be a bad PCM?
If the fuses are not getting power the ignition switch may be bad. That happens some on the TJs. The gauges not responding can be an indication of a bad PCM too but without key on/start power to the PCM I would guess the problem is elsewhere.