Powertrain Controls - ECM/PCM

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
Ignition voltage is supplied to the control module to indicate the ignition status of the ignition switch. Battery voltage is supplied to the control module to, in part, maintain memory of learned functions and parameters.

DTC 53 WILL SET WHEN
^ The ignition is "ON."
^ The ignition system voltage is greater than 19.5 volts.
^ All conditions met for 2 minutes.

ACTION TAKEN (PCM WILL DEFAULT TO)
^ Maximum line pressure.
^ 2nd gear (4L80E), 3rd gear (4L60E).
^ Inhibit Torque Converter Clutch (TCC).

DTC 52/53 WILL CLEAR WHEN
Fault condition no longer exists, and the ignition switch is cycled "OFF" then "ON."

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic charts.
1. Normal battery voltage is between 9-15 volts.
2. This test checks if the generator is faulty under load conditions. If the voltage is greater than 15 volts, refer to Charging System.

DIAGNOSTIC AIDS
^ Charging the battery and jump-starting an engine may set DTC 52/DTC 53. If DTC(s) set when an accessory is operated, check for faulty connections or excessive current draw. Refer to Charging System for circuit details.
^ Check for faulty connections at the starter solenoid or fusible link.