Powertrain Controls - ECM/PCM

DTC 53 System Voltage High:

System Voltage High:

CIRCUIT DESCRIPTION
CKT 440 is the battery feed for the PCM.

DTC 53 WILL SET WHEN
The ignition is "ON" and PCM terminal "E16" voltage is greater than 19.5 volts for 2 seconds.

ACTION TAKEN (PCM WILL DEFAULT TO)
During the time the failure is present, the pressure control solenoid is turned "OFF," transmission shifts immediately to third gear, and Torque Converter Clutch (TCC) operation is inhibited. (The setting of additional diagnostic trouble codes may result.) The PCM will enable the Malfunction Indicator Lamp (MIL).

DTC 53 WILL CLEAR WHEN
Conditions for fault are no longer present and Tech 1 "Clear DTCs" function is used or 50 ignition switch keycycles have passed with no further faults or ignition switch is turned "OFF" and fuse #9 is removed for 10 seconds.

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Normal battery voltage is between 9-15 volts.
2. This test checks if the high voltage reading is due to the generator, CKT 440 or PCM, with engine operating, check voltage is above 15 volts, the PCM is OK.
3. This test checks to see if generator is faulty under load condition. If the voltage is greater than 15 volts, refer to Starting and Charging. Starting and Charging

DIAGNOSTIC AIDS
CKT 440 supplies battery voltage to the PCM. Charging battery with a battery charger and jump-starting engine may set DTC 53. If diagnostic trouble code sets when an accessory is operated, check for poor connections or excessive current draw. Also, check for poor connections at starter solenoid or fusible link.