Transmission Controls With PCM

Diagnostic Chart:

Wiring Diagram:

4th clutch is applied when Circuit 446 is opened at the PCM.

INFORMATION FLAG PARAMETERS

Info. Flag 77 is set when the PCM has detected the following condition afier the 4th actuator has been switched on electrically at the PCM twice per ignition cycle.

^ Voltage from the 4th actuator to PCM terminal J3C08 (Circuit 446) is below 2 - 2.5 volts.



TEST DESCRIPTION

Numbered steps below refer to numbered steps on chart.


1. This step verifies problem is still present.


2. If actuator is shorted internally and resistance is one ohm or less than the average resistance at the other actuators, the actuator or connector plate is shorted.


3. If Circuit 446 is shorted to voltage Info. Flag 77 will set. This step checks Circuit 446 for a short to voltage.


4. This step will indicate if the actuator or connector plate is faulty.

DIAGNOSTIC AIDS

When attempting to diagnose an intermittent problem use the Scan tool* to review supplemental diagnostic information. The supplemental data can be used to duplicate a problem.

* Select MALF History from Scan tool TCM menu.

Check the tightness of the female terminal grip with a spare male terminal.

When the PCM detects a fault in the circuit (open, ground, short) the PCM will open the circuit internally to protect the circuit.

^ Conditions that set this information flag will probably result in a DTC/information flag 78 - 4th Gear Stuck On and a DTC 25 - No TCC.