VT25-E Automatic Transmission

VT25-E AUTOMATIC TRANSMISSION

DTC P0962





Circuit Description with VT25-E Automatic Transmission
The TCM uses the line pressure control (PC) solenoid valve in order to regulate the transmission line pressure. The line PC solenoid valve is attached to the control solenoid valve assembly. The TCM compares TP angle signal, transmission fluid temperature, speed ratio, and other inputs in order to determine the line pressure appropriate for a given load. The TCM regulates the pressure by applying an amperage to the line PC solenoid valve. The applied amperage varies from 0.1 amps for maximum line pressure to 1.1 amps for minimum line pressure. The TCM then monitors the amperage at the return line.
When the TCM detects a continuous short to ground in the line PC solenoid valve circuit, DTC P0962 sets. DTC P0962 is a type B DTC.

Conditions for Running the DTC
^ No line PC solenoid DTCs P0960, or P0961.
^ The ignition voltage is 8 - 18 volts.
^ The engine speed is greater than 500 RPM for 5 seconds.

Conditions for Setting the DTC
The TCM detects a continuous short to ground for 1.3 seconds.

Action Taken When the DTC Sets
^ The TCM requests the ECM to illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.
^ The TCM turns the power off to the line PC solenoid valve which results in maximum line pressure.
^ The TCM no longer inhibits shifting to between reverse and drive when moving.
^ The TCM commands maximum pressure to the input clutch.
^ The TCM freezes garage shift transmission adaptive functions.
^ The TCM freezes main line pressure transmission adaptive functions.
^ The ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as Freeze Frame and Failure Records.
^ The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Failure Records.
^ The TCM stores DTC P0962 in TCM history during the second consecutive trip in which the Conditions for Setting the DTC are met.

Conditions for Clearing the MIL/DTC
^ The ECM turns OFF the MIL after the third consecutive drive trip in which the TCM does not send a MIL illumination request.
^ A scan tool can clear the MIL/DTC.
^ The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without an emission related diagnostic fault occurring.
^ The TCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the TCM.

Diagnostic Aids
^ Inspect the connectors at the TCM, the transmission, and all other circuit connecting points for an intermittent condition.
^ Inspect the circuit wiring for an intermittent condition.