7.3 PCM + IDM Testing
7.3 PCM + IDM Testing 7.3 PCM + IDM Testing

 We can bench test your PCM or IDM separately, or both together at the same time. 

The more info you provide about your vehicle's symptoms and issues, the more thoroughly we can test your modules,  and the better guidance we can give you for additional troubleshooting steps.

You can send us your information via our customer portal:  Diesel Technology of Chattanooga.  Please open this link in a New Tab or Window so you don't lose your place here on our website and have to navigate back to it. Or, just use your browser's Back button several times to get back to this page. After filling out your information, come back here to finish placing your order.

By using our portal, we can access the information about your module's issues before it arrives. Then if we need clarification or have questions for you, we can ask them while waiting for your order, often saving valuable time!

You can also download, print and fill out our Customer Vehicle Information sheet and send it in with your unit(s).

PCM testing consists of verifying that the PCM boots up, activates the Glow Plug Relay or Module, Fuel Pump, Injector Driver Module, receives a Cam Position Sensor signal, commands the IDM to fire the injectors, activates the appropriate transmission shift solenoids in response to moving the range selector lever, connects to a scan tool, and that it transmits the correct sensor values.

Signals such as the Injection Pressure Regulator and Electronic Pressure Control are also checked with an oscilloscope. After testing, we'll email you with our findings, and suggest additional troubleshooting steps if the PCM tests good. 

If you are running a performance chip, please send it with your PCM. There is no extra charge to test your chip with your PCM. Do not send the cable or switch.

IDM testing consists of verifying that the IDM fires all 8 injectors, runs an Injector Buzz Test to see if it is throwing false codes, and checking the output voltage and waveforms to the injectors with an oscilloscope.

As the IDM ages, the current output drops due drift in the tolerances of various components. The oscilloscope checks show the degree to which the IDM has lost performance.

If you are troubleshooting a no-start or injector misfire condition, we recommend you test both units, unless you have ruled out one or the other of the modules by swapping a known-good test unit into the problem vehicle.