P0703

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

With the brake pedal applied, the brake lamp switch closes and the battery voltage supplies to terminal 39 of the Transmission Control Module (TCM). When you release the brake, the brake switch opens and terminal 39 of the TCM removes the battery voltage.

CONDITIONS FOR RUNNING THE DTC

The Output Speed is greater than 192 RPM.

CONDITIONS FOR SETTING THE DTC

The brake switch remains open for longer than 20 Minutes.

ACTION TAKEN WHEN THE DTC SETS

^ The Malfunction Indicator Lamp (MIL)/Service Transmission Lamp (STL) will not illuminate.

^ The TCM memory stores the DTC at the time of the first failure.

CONDITIONS FOR CLEARING THE MIL/DTC

^ A History DTC clears after forty consecutive warm-up cycles if no failures are present by this or any other non-emission related diagnostic.

^ The scan tool clears the MIL/DTC.

DIAGNOSTIC AIDS

Use the Connector Test Adapter Kit J 35616-A for any test that requires probing the TCM harness

connector or a component harness connector. Using this kit will prevent damage to the harness connector terminals.

Check for the following conditions:

^ Poor connections at the TCM or at the component. Inspect the harness connectors for any backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection. Refer to Overall Vehicle Information / Diagrams / Diagnostic Aids for Checking Terminal Contact procedure.

^ Damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, observe the scan tool while moving any related connectors and any wiring harnesses. A change in the display may help to locate the fault.

TEST DESCRIPTION

The number(s) below refer to the step number(s) on the Diagnostic Table.

3. In the previous step, the parameter did not change during the functional test. This step determines whether the circuit has failed high or failed low.

10. Check both circuits for a short to ground if the fuse for the supply circuit is open.