P1701

Diagram Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

This DTC indicates that a transmission related OBD II failure has occurred. The Transmission Control Module (TCM) controls a dedicated Service Transmission Lamp (STL) which illuminates when a fail reports by certain non-emissions related TCM diagnostics. The TCM has no direct control of the engine Malfunction Indicator Lamp (MIL), but if a transmission fault occurs that is emissions related, the engine MIL must illuminate. A MIL Request circuit between the ECM and the TCM provides a means for illuminating the MIL, even though the fault was detected by the TCM. This circuit is pulled up to B+ within the ECM. In order to illuminate the MIL, the TCM pulls the circuit low. The ECM detects this and DTC P1700 is set, which illuminates the MIL. DTC P1701 indicates that the ECM has a detected problem with the MIL Request circuit.

CONDITIONS FOR RUNNING THE DTC

Engine cranking

CONDITIONS FOR SETTING THE DTC

^ A short to ground, an open circuit, or a short to battery voltage detected on the MIL Request circuit

^ The condition has been present for at least 2.5 seconds.

ACTION TAKEN WHEN THE DTC SETS

The ECM illuminates the Malfunction Indicator Lamp (MIL) and records the operating conditions in the Freeze Frame on the second consecutive drive trip that the diagnostic runs and fails.

CONDITIONS FOR CLEARING THE MIL/DTC

^ The ECM turns off the MIL after three consecutive drive trips that the diagnostic runs and does not fail.

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

^ The ECM battery voltage is interrupted.

^ The scan tool clears the MIL/DTC.

DIAGNOSTIC AIDS

For any test that requires probing the TCM harness connector or a component harness connector, use the Connector Test Adapter Kit J 35616-A. Using this kit will prevent damage to the harness connector terminals.

Check for the following conditions:

^ Poor connections at the ECM, 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 Diagrams / Diagnostic Aids for Checking Terminal Contact procedure.

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

TEST DESCRIPTION

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

6. Checks for a shorted MIL Request circuit within the TCM.