Powertrain Controls - ECM/PCM

System Voltage High Long:

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.

DIAGNOSTIC TROUBLE CODE (DTC) 52 WILL SET WHEN
The ignition is "ON" and the Powertrain Control Module (PCM) terminal "E16" voltage is greater than 16 volts for 109 minutes.

DIAGNOSTIC TROUBLE CODE (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)
The pressure control solenoid (PCS) is turned "OFF," 3-2 control solenoid is turned "0FF" transmission shifts immediately to third gear, and Torque Converter Clutch (TCC) operation will be inhibited. (The setting of additional diagnostic trouble codes may result.)

DTC 52 WILL SET 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 chart:

1. This test checks that 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 Starting and Charging.

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.
- Check for faulty connections at the starter solenoid or fusible link.