P0741

CIRCUIT DESCRIPTION

The 1-2 Shift Solenoid Valve (1-2 SS Valve) controls the transmission fluid pressure on the 1-2 shift valve. The ERLS fuse provides ignition voltage to the solenoid. The Output Driver Module (ODM), within the Powertrain Control Module (PCM), provides ground. The PCM monitors voltage levels at the ODM. When you command the 1-2 SS Valve ON, the PCM receives low voltage. When you command the 1-2 SS Valve OFF, the PCM receives high voltage.

DTC P0753 sets if the received voltage is outside the calibration limits. DTC P0753 is a type A DTC.

CONDITIONS FOR SETTING THE DTC

^ The ignition is ON.
^ The system voltage is 10-16 volts.
^ The engine speed is greater than 500 RPM.
^ Not in fuel shut-off
^ The PCM commands the solenoid valve ON and the voltage remains high (B+).
^ The PCM commands the solenoid valve OFF and the voltage remains low (0 V).
^ All conditions are met for 5 seconds.

ACTION TAKEN WHEN THE DTC SETS

^ The PCM inhibits downshifts to 2nd gear if the vehicle speed is greater than 48 km/h (30 mph).
^ The PCM illuminates the Malfunction Indicator Lamp (MIL).

CONDITIONS FOR CLEARING THE MIL/DTC

^ The PCM turns OFF the MIL after three consecutive ignition cycles without a failure reported.
^ A scan tool can clear the DTC from the PCM history. The PCM clears the DTC from the PCM history if the vehicle completes 40 warm-up cycles without a failure reported.
^ The PCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough in order to power down the PCM.

DIAGNOSTIC AIDS

^ Inspect the wiring for poor electrical connections at the PCM. Inspect the wiring at the transmission 7-way connector. Inspect the wiring at the 1-2 SS Valve connector. Look for the following conditions:

- A bent terminal
- A backed out terminal

CONDITIONS FOR CLEARING THE MIL/DTC

^ The PCM turns OFF the MIL after three consecutive ignition cycles without a failure reported.
^ A scan tool can clear the DTC from the PCM history. The PCM clears the DTC from the PCM history if the vehicle completes 40 warm-up cycles without a failure reported.
^ The PCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough in order to power down the PCM.

DIAGNOSTIC AIDS

^ Inspect the transmission fluid level.
^ The transmission may be in hot mode. Inspect the transmission fluid lines to the radiator. The lines may be pinched, plugged or twisted.

TEST DESCRIPTION

The numbers below refer to the step numbers on the diagnostic table.

5. This step verifies that the TCC engages when commanded ON by the scan tool.