P1845

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

The Transmission Control Module (TCM) sends a Pulse Width Modulated (PWM) signal to the ABS controller. The signal pulse width corresponds to the actual gear in which the transmission is currently operating. If a circuit fault is detected by the TCM, this DTC will set.

CONDITIONS FOR RUNNING THE DTC

Tests continuously

CONDITIONS FOR SETTING THE DTC

The TCM detects an open, short to ground, or short to B+ on the output circuit.

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.

10. Check the circuit for the following conditions which may cause an intermittent problem:

^ Poor connections at the ECM or TCM. 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.

^ Misrouted harness. Inspect the harness to ensure that the harness is not routed too close to high voltage wires such as spark plug leads, or too close to high current devices such as the alternator, motors, solenoids etc.

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