P0758

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 met for 5 seconds

ACTION TAKEN WHEN THE DTC SETS

^ 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 a change.

TEST DESCRIPTION

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

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

6. This Step verifies that the ignition supplies power to the 2-3 58 Valve through the EMI fuse.

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