P0758

CIRCUIT DESCRIPTION
The 2-3 Shift Solenoid Valve (2-3 SS Valve) controls the fluid flow acting on the 2-3 shift valves. The solenoid is a normally-open exhaust valve. With the 1-2 Shift Solenoid Valve (1-2 SS Valve), the 2-3 SS Valve allows four different shifting combinations. The solenoid attaches to the control valve body within the transmission. The 2-3 SS Valve receives ignition voltage through circuit 1020. The VCM controls the solenoid by providing the ground path on circuit 1223.

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

CONDITIONS FOR SETTING THE DTC
^ The system voltage is 10-17 volts.
^ The engine is running.
^ All of the above conditions are met for 5 seconds and either of the following fail conditions occurs for 5 seconds:

- The VCM commands the solenoid ON and the voltage remains high (B+).
- The VCM commands the solenoid OFF and the voltage remains low (0 volts).

ACTION TAKEN WHEN THE DTC SETS
^ The VCM commands third gear only.
^ The VCM commands maximum line pressure.
^ The VCM freezes shift adapts from being updated.
^ The VCM inhibits TCC engagement.
^ The VCM illuminates the Malfunction Indicator Lamp (MIL).

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

DIAGNOSTIC AIDS
^ Inspect the wiring for poor electrical connections at the VCM. Inspect the wiring for poor electrical connections at the transmission 20-way connector. 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 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 tests the function of the 2-3 SS Valve and the Automatic Transmission Wiring Harness Assembly.
5. This Step tests for power to the 2-3 SS Valve from the ignition through the fuse.
7. This Step tests circuit 1223 from the transmission 20-way connector to the VCM for an open.
8. This Step tests circuit 1223 from the transmission 20-way connector to the VCM for a short to ground.