P0758

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
The 2-3 Shift Solenoid Valve controls fluid acting on the 2-3 shift valves. The 2-3 SS Valve is a normally-open exhaust valve used with the 1-2 Shift Solenoid Valve (1-2 SS Valve) in order to allow four different shifting combinations. The 2-3 SS Valve attaches to the control valve body within the transmission. The ignition voltage goes directly to the 2-3 SS Valve. The Powertrain Control Module (PCM) controls the 2-3 SS Valve by providing the ground path through circuit 1223.
If 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 engine is running greater than 475 RPM for greater than 7 seconds.
^ The system voltage is 10 - 16.5 volts.
^ The PCM commands the 2-3 SS Valve On, and the voltage remains high (B+).
^ The PCM commands the 2-3 SS Valve Off, and the voltage remains low (0 volts).
^ A fault is detected for 4.3 out of 5 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM commands an immediate landing to second gear.
^ The PCM commands maximum line pressure.
^ The PCM freezes 1-2 shift adapts from being updated.
^ The PCM inhibits TCC engagement.
^ The PCM illuminates the Malfunction Indicator Lamp (MIL).

CONDITIONS FOR CLEARING THE MIL/DTC
1. The PCM turns OFF the MIL after three consecutive ignition cycles without a failure reported.
2. 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.
3. 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 problems:
- 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, massage the wiring harness while watching the test equipment for a change.
^ First diagnose and clear any engine DTCs that are present. Then inspect for any transmission DTCs that may have reset.
^ Refer to Shift Solenoid Valve State and Gear Ratio table. Shift Solenoid Valve State and Gear Ratio

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
4. This step tests the function of the 1-2 SS Valve and the internal wiring harness.
5. This step tests the power to the 1-2 SS Valve from the ignition through the fuse.
7. This step tests the ability of the PCM and the wiring to control the ground circuit.
10. This step measures the resistance of the Automatic Transmission Wiring Harness Assembly and the 2-3 SS Valve.