Transmission Code

Diagnostic Chart:

Description:

CIRCUIT DESCRIPTION

The Transmission Control Module (TCM) continuously monitors the system voltage at terminal 3. The system voltage outside of the range. 9 to 16 volts can adversely affect transmission operation. The Serial Data is disrupted when the system voltage is below 9 Volts or above 16 Volts. A scan tool may not display the data if the system voltage is outside of this range. Use a DVM in order to monitor the system voltage. Check the system voltage in order to determine if the malfunction is currently present.

CONDITIONS FOR RUNNING THE DTC

Tests continuously

CONDITIONS FOR SETTING THE DTC

^ The system voltage is greater than 16 volts for 1 second.

^ The system voltage is less than 9 volts for 2 seconds.

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

Charging the battery with a battery charger or jump-starting an engine may set DTCs. If DTCs set when operating an accessory, check the circuits that are associated with that accessory for a poor connection or an excessive current draw. Also, check for the following conditions:

^ Poor connections at the starter solenoid or the fusible link

^ Loose or damaged terminals at the generator

^ Check the belt for any wear or tension. 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 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 in order to locate the fault.

TEST DESCRIPTION

The number(s) below refer to the step numbers on the diagnostic table.

2. Checks for an excessive generator output. The voltage should remain below 16.0 Volts.

3. Checks the charging system under the load at the idle speed. The voltage should remain above 9.0 Volts.