PCM (Automatic Transmission)

DTC 53 System Voltage High:

Battery Feed Circuit:

Circuit Description:
DTC 53 will set when the ignition is "ON" and PCM terminal "E16" voltage is greater than 19.5 volts for 2 seconds.
During the time the failure is present, the pressure control solenoid is turned "OFF," transmission shifts immediately to third gear, and TCC operation is inhibited. (The setting of additional diagnostic trouble codes may result.)


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 at the battery. If the 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 "Charging System."

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. Refer to appropriate service manual for circuit details. Also, check for poor connections at starter solenoid or fusible link.