P0976

AF23-5 AUTOMATIC TRANSAXLE

DTC P0976

Test 1-6:

Test 7-12:

Circuit Description with AF23-5 Automatic Transaxle
The 2-3, 3-4 shift solenoid (SS) valve (S2) controls transmission fluid pressure acting on the M2 shift valve to position the valve for the appropriate gear. The 2-3, 3-4 SS valve (S2) is a normally open exhaust valve located on the front control valve body. The solenoid is case grounded. The output driver module (ODM), within the TCM, commands the solenoid ON or OFF by providing voltage. When the 2-3, 3-4 SS valve (S2) is commanded ON, the TCM senses high voltage. When the 2-3, 3-4 SS valve (S2) is commanded OFF, the TCM senses low voltage.

If the TCM detects a continuous short to ground in the 2-3, 3-4 SS valve (S2) circuit, then DTC P0976 sets. DTC P0976 is a type A DTC.

Conditions for Running the DTC
^ The system voltage is 8-18 volts.
^ The engine run time is greater than 5 seconds.
^ Trans. Protection Mode is OFF.
^ The TCM commands the 2-3, 3-4 SS valve (S2) ON.

Conditions for Setting the DTC
The 2-3, 3-4 SS valve (S2) feedback circuit indicates a continuous short to ground for 0.5 seconds-

Action Taken When the DTC Sets
^ The TCM requests the engine control module (ECM) to illuminate the malfunction indicator lamp (MIL).
^ The TCM turns the Trans. Protection Mode ON. When the Trans. Protection Mode is ON, the following conditions occur:
- The transmission will operate in 5th gear when the transmission is shifted into D or I range and 2nd gear when shifted into L range.
- The line pressure is at maximum.
- The torque converter clutch (TCC) is disabled.
- The TCM freezes the transmission adaptive functions.
^ The TCM stores DTC P0976 in TCM history.

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 too[ 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.

Test Description
The numbers refer to the step numbers on the diagnostic table.
3. This step tests the TCM and the wiring to the transmission.
5. This step verifies that the circuit has the correct resistance.