P0758

Diagnostic Chart:

Diagnostic Chart (cont'd):

Diagnostic Chart (cont'd):

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

The 2-3 Shift Solenoid Valve (2-3 SS Valve) controls the fluid acting on the 2-3 shift valves. The solenoid is a normally-open exhaust valve In combination with the 1-2 Shift Solenoid Valve, the 2-3 SS Valve allows four different shifting combinations. The solenoid is attached to the control valve body within the transmission. Circuit 439 supplies ignition voltage directly to the 2-3 SS Valve. The PCM controls the solenoid by providing the ground path through circuit 1223.

When the PCM detects a continuous open or short to ground in the 2-3 SS Valve circuit or in the 2-3 SS Valve, then DTC P0758 sets. DTC P0758 is a type A DTC.


CONDITIONS FOR SETTING THE DTC

- The ignition is ON.

- The system voltage is 10-17 volts.

- The PCM commands the solenoid ON and the voltage remains high (B+).

- The PCM commands the solenoid OFF and the voltage remains low (0 volts).

- All conditions are met for 5 seconds.

ACTION TAKEN WHEN THE DTC SETS

- The PCM commands third gear only.

- The PCM commands maximum line pressure.

- The PCM freezes shift adapts from being updated.

- The PCM inhibits TCC engagement

- 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 any poor electrical connections at the PCM. Inspect the wiring at the TCC brake switch, Look for the following conditions:

- A bent terminal

- A backed out terminal

- A damaged terminal

- Poor terminal tension

- A chafed wire

- A broken wire inside the insulation

- When diagnosing for an intermittent short or an open condition, massage the wiring harness while watching the test equipment for changes.

TEST DESCRIPTION

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

4. Step 4 verifies that the 2-3 SS Valve and the Automatic Transmission wiring harness are functioning normally.

6. Step 6 verifies that the ignition supplies power to the 2-3 SS Valve through the PCM IGN fuse.

16. Step 16 verifies that the valve's resistance is within specifications.