P0758

Diagnostic Chart:

Description:

Wiring Diagram:

Circuit Description
The 2-3 Shift Solenoid Valve (2-3 SS Valve) controls the fluid flow acting on the 2-3 shift valves. The 2-3 SS Valve is a normally-open exhaust valve that is used with the 1-2 Shift Solenoid Valve in order to allow 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 PCM controls the solenoid by providing the ground path on circuit 1223.

When the PCM 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 10-16 volts.
^ The engine speed is 450 RPM for 8 seconds.
^ Not in fuel cutoff.
^ All of the above conditions are met for 5 seconds and either of the following fail conditions occurs for 5 seconds.

- 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).

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 poor electrical connections at the PCM. 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.
6. This Step tests the ability of the PCM and the wiring to control the ground circuit.
13. This step measures the resistance of the Automatic Transmission Wiring Harness Assembly and the 1-2 SS Valve.