P0725

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

A processed Crankshaft Position (CKP) sensor signal is sent to the Transmission Control Module (TCM) from the ECM. The TCM calculates the engine speed from this signal. The Engine Speed circuit is pulled up to B+ within the ECM.

CONDITIONS FOR RUNNING THE DTC

^ The Selector Position is not equal to P, R, N.

^ The Transmission Output speed is greater than 1000 RPM.

^ The Throttle position is greater than 12 percent.

CONDITIONS FOR SETTING THE DTC

The engine speed indicates less than 96 RPM.

ACTION TAKEN WHEN THE DTC SETS

^ The TCM illuminates the Service Transmission Lamp (STL) and sends a Malfunction Indicator Lamp (MIL) Request to the ECM on the second consecutive drive trip that the diagnostic runs and fails. The ECM then illuminates the MIL.

^ The ECM records the operating conditions in the Freeze Frame at the time of the MIL Request from the TCM.

^ The transmission operates in the Default Mode.

CONDITIONS FOR CLEARING THE MIL/DTC

^ The TCM turns off the STL as soon as the fault is no longer present.

^ The ECM turns off the MIL after three consecutive drive trips during which the TCM sends no MIL Request.

^ A History DTC clears after forty consecutive warm-up cycles, if no failures are present by this diagnostic or any other 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 relate connectors and any wiring harnesses. A change in the display may help to locate the fault.