P1502

Circuit Description
This DTC sets if the ECM has not been programmed with the frequency code of the theft deterrent module, or if there is a fault in the circuit used for transmitting the data (the vehicle speed/theft deterrent signal circuit).

Conditions for Running the DTC
The engine is cranking.

Conditions for Setting the DTC
The ECM has not received the frequency code from the Theft Deterrent Module.

Action Taken When the DTC Sets
The ECM will not illuminate the Malfunction Indicator Lamp (MIL).

Conditions for Clearing the MIL/DTC
^ The DTC clears after forty consecutive warm-up cycles if no failures report by this diagnostic or any other non-emission related diagnostic.
^ The ECM battery voltage is interrupted.
^ The scan tool clears the MIL/DTC.

Diagnostic Aids
If the ECM and the theft deterrent module have not been properly programmed, this DTC may set and the vehicle will not start. Refer to Theft Deterrent System for programming instructions.

Notice: Refer to J 35616-A Connector Test Adapter Kit Notice in Service Precautions.

Use the J 35616-A connector test adapter kit for any test that requires probing the ECM harness connector or a component harness connector.

Check for the following conditions:
^ Poor connections at the ECM or at the component-Inspect the harness connectors for a poor terminal to wire connection.
^ Damaged harness-Inspect the wiring harness for 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 locate the fault.

Refer to Symptoms for the Intermittents. Symptom Related Diagnostic Procedures

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step verifies whether or not the ECM is receiving vehicle speed data.
3. The test lamp that is connected to B+ is used to simulate the B+ pull-up within the ECM. The DMM can be connected to the shaft of the test lamp and battery ground.