Transmission Controls With PCM

HOLD MODE STUCK ON
On 1991 and 1992 vehicles the amount of electrical current required to energize an actuator is greater than the amount of current required to hold an actuator in the closed position. Hold mode is a feature built into the PCM that reduces current draw of the 2nd, 3rd, and 4th actuators when these clutches are being held off.

DTC PARAMETERS
DTC 53 is set when the PCM fails internally.

TEST DESCRIPTION
Check for diagnostic trouble codes/information flags 48-Hold Mode Voltage Low, 66-Clamp Circuit Shorted, 67-Clamp Circuit Open, and 92-Clamp Circuit Intermittent Fault. They must be eliminated first as a possible cause of DTC 53.
^ Check transaxle PCM connector J3 for tightness.
^ Clear all diagnostic trouble codes/information flags, test drive the vehicle and if DTC 53 resets, replace the PCM.

Check all actuators circuits for correct resistance. If the resistance checks are within specification, replace the PCM.

NOTICE: When checking the resistance of the actuators, compare the readings obtained for each actuator. The resistance of the actuators should he within one ohm of each other. Actuator resistance increases with temperature.

Refer to wiring diagram for actuator circuit/connector identification.