Circuit/System Testing

You must perform the CIRCUIT/SYSTEM VERIFICATION  before proceeding with Circuit/System Testing.

1. Ignition OFF, disconnect the C1 harness connector at the transmission control module (TCM).
2. Test for less than 1.0 ohm of resistance between ground circuit terminal 9 and ground.
   • If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
   • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, replace the TCM.
   • If all circuits test normal, replace the TCM.