Transmission Controls With PCM

Diagnostic Chart:

Wiring Diagram:

The amount of electrical current required to energize an actuator is greater than the amount of current required to hold an actuator in position. Hold mode is a feature built into the PCM that reduces current draw of the TCC actuator when TCC is being held on. After TCC is applied the driver at terminal 13E14 is opened and an actuator ground path is provided through the five ohm resistance wire to a ground at PCM terminal J3E11. When the circuit is opened at the PCM, an internal PCM circuit monitors circuit voltage to check for proper circuit conditions.

INFORMATION FLAG PARAMETERS

Info. Flag 88 is set when the PCM has detected the following conditions after the hold mode circuit has been switched on electrically at the PCM twice per ignition cycle.

^ Voltage from the actuator to PCM terminal J3E11 (Circuit 131) is greater than 2 2.5 volts.


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



TEST DESCRIPTION

Numbered steps below refer to numbered steps on chart.

1. Info Flag 81 diagnoses an electrical fault and must be eliminated first.

2. This step verifies problem is still present.


3. If Circuit 131 is shorted to voltage Info. Flag 88 will be set. This step checks for a short to voltage in Circuit 131.

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.