How to Test a PCM
May 21, · You are way too quick to suspect the PCM unless you think you have done something to it. Can't really test anyway, the best way is swapping out a known good PCM as there are literally things to be tested there. You will get zero through the comm port with just a single bent pin to not make connection. Feb 12, · Engine Computer, PCM/Engine Control Module/ECU Control Module — Using a Scanner. For step 3 of you diagnostics, you can use a tool such as a scanner. Hooking up a scanner to your OBD-II port will Author: Flagship One Inc.
This means the vehicle has to have been manufactured afterand any troubleshooting must be done with a diagnostic hardware. The module runs a series of tests, and once it finds a malfunction, it activates your service engine soon light. If the PCM has failed to work properly, it will need to be replaced or reprogrammed.
Look up online your vehicle manufacturer's codes and print them out. You can also find these codes in a Haynes Repair Manual for your make and model-year. Open the passenger's side front door to your vehicle, and place both the scanner's manual and your printed out materials.
These are research materials you will need towards how to test a pcm end of this process. Shut the passenger's side door, and walk around the what are the causes of itchy skin. Open the driver's side door, and look under the dashboard, near the steering column.
You are looking for a sixteen pin-receiving computer outlet. Where to look depends on your exact make and model year. Look at the scanner's display read-out, and if it has not automatically turned itself on, find the power button and switch it on yourself.
All brands of scanners function slightly different from each other. To find the exact operational procedures for your device, consult your device's handbook.
Place your key into your vehicle's ignition and turn the electrical system on. Your scanner may what reflexes are babies born with need the engine running as well. Scroll through the codes on your scanner's display. Pay attention only to codes that start with a "P" for powertrain.
You are looking specifically for trouble codes that deal only with the PCM. Most of those trouble codes will be manufacturer specific, so you will have to consult the print outs or the Haynes Manual you left in the navigator's seat.
Richard Ristow has written for journals, newspapers and websites since His work has appeared in " Nebula Showcase" and elsewhere. Step 2 Look up online your vehicle manufacturer's codes and print them out. Step 3 Open the passenger's side front door to your vehicle, and place both the scanner's manual and your printed out materials. Step 4 Shut the passenger's side door, and walk around the vehicle.
Step 6 Place your key into your vehicle's ignition and turn the electrical system on.
Jul 23, · Hi, just found out about an easy way to test your PCM if you suspect its junk. 1-Verify that there is battery voltage going in to the PCM at pin connectors 2 and 22 on the black connector. These are the orange wire and the red/yellow wire. 2-Verify that the 2 ground wires for the PCM are reading 0 resistance/good continuity to ground. Jan 22, · Jumper cables are faster for a test ground. If you were at the dealer you should have had them throw the scanner on it. Seeing as how you didn't. Cycle the key three times. Leave it on the third time. This will tell the PCM to do a self diagonstic's. The check engine light will flash the codes. All codes are a 2 digit number. So count the flashes. Mar 06, · you can indeed test the PCM using a multi tester and a diagnostic tree that is in Ford Service manual. It is not easy but doable. I have done a few but you need the diagostic tree to follow the procedure. Maybe someone can scan and post it or have a link.
The Temperature Sensors are sent 5 Volts and ground through a second wire. Sensor testing can be done with a DVOM. Many of the auto parts stores will scan your car for free. Use the information to identify the sensor circuit that has the problem. With the sensor unplugged, there should be very close to 5 Volts at the harness with the key "on".
With an Ohmmeter, check the sensor resistance and compare it to the specification. To test a temperature sensor you need an accurate Ohmmeter, and an accurate voltmeter. T-pins will also be helpful for testing the circuit without damaging wiring or connections.
Service Tip: To check a temperature sensor out of the vehicle, place the sensor in a cup of ice and water.
The sweep of the TPS should produce a low voltage at idle and about 4. The third wire is the signal. It should go from about. Gas engine vehicles typically use a TPS on the throttle body. To test this sensor you will need an accurate voltmeter set on DC Volts and t-pins. Use the following procedure to test the TPS. Service Tip: The TPS can cause hesitations on acceleration and electronic transmission shifting problems.
Pressure Sensor use three wires like the TPS. The Pressure Sensor changes pressure to a voltage. Test the signal wire at different pressures. To test these sensors you will need an accurate voltmeter set on DC Volts and t-pins. Use the following procedure to test the pressure sensors. The four wires are:. Test this sensor as if it was two different sensors.
If either sensor fails the tests, both have to be replaced together. Two sensors are combined into the Combination Pressure Temperature Sensor. The Pressure Sensor has a signal wire. A separate 5 Volt wire is used for the Temperature Sensor with a shared ground wire. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters.
Question: What would cause a high reading of 5. Answer: There are voltage regulators in the computer. There is usually more than one 5v output. See if one or all are high. Question: What would cause a high reading of 9.
Plug the sensor in and check the signal wire by backprobing the connection. This voltage will be between 1 and 4 volts, depending on the pressure in the tank.
I have a 99 silverado, had it for many years, taken good care of it. I've just put a newER low mileage engine 40k in it, I've been fighting a five volt circuit issue for a long time, i cant seem to narrow it down, i started the search from a check engine light fuel tank pressure sensor circuit code , new computer, i have a 5 volt reference wire that is good but my 5 volt signal wire shorted to ground, I've traced it all the way to the pcm, i unplug the pcm, an i loose the short,.
Plugging a scan tool in can usually locate the version. The tag version might have been upgraded several times. The engine seems to run well otherwise, good gas milage, etc. Is there any way to look up online what the current flash version is software version?
AutoZone said that it should have a sticker affixed to indicate current SW version. Any info greatly appreciated, thanx Need help,i was driving and outta nowhere mi 02 focus 2. The CZ motorcycle, an import from Czechoslovakia, had tough competition from the newly introduced Japanese motorbikes in This article details my route to be a first-time motorcycle owner and my experience of this sometimes underrated machine.
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