Circuit/System Testing
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect the IMS connector at the control solenoid (w/body and TCM) valve assembly. Ignition ON. The scan tool IMS A/B/C/P parameter should display HI for all four signal circuits.
- If a signal circuit displays LOW, the control solenoid (w/body and TCM) valve assembly is faulty.
- Connect a 3-amp fused jumper wire between each transmission range signal circuit at the control solenoid (w/body and TCM) valve assembly and ground ensuring that the signal circuit displays LOW when connected to ground.
- If a signal circuit remains HI when connected to ground, the control solenoid (w/body and TCM) valve assembly is faulty.
- If the above two tests indicate correct TCM functions, the IMS is faulty.