P0758

CIRCUIT DESCRIPTION

The 2-3 shift solenoid valve controls the transmission fluid to the 2-3 shift valve. Ignition voltage is provided to the solenoid. The Powertrain Control Module (PCM) Output Driver Module (ODM) provides the ground. When the 2-3 shift solenoid valve is commanded ON, the PCM senses 0 volts. When the 2-3 shift solenoid valve is commanded OFF, the PCM senses ignition voltage.

If the PCM detects voltage limits that do not meet the calibration, then DTC P0758 sets. DTC P0758 is a Type A DTC.

CONDITIONS FOR SETTING THE DTC

^ No ODM DTC P1650 set.
^ The engine has been running for more than 5 seconds.
^ The PCM detects an open, a short to ground, or a short to power on the 2-3 shift solenoid valve circuits within 5 seconds.

ACTION TAKEN WHEN THE DTC SETS

^ The PCM illuminates the Malfunction Indicator Lamp (MIL).
^ SERVICE ENGINE SOON, SERVICE TRANSMISSION displays on the Driver Information Center (DIC).
^ The PCM commands 2nd gear.
^ The PCM commands default line pressure.
^ The PCM disables steady state adapts.
^ The PCM disables garage shift adapts.
^ The PCM inhibits Torque Converter Clutch.
^ The PCM inhibits torque management.

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 2-way connector. Inspect the wiring for poor electrical connections at the 2-3 Shift Solenoid valve Connector. Look for the following problems:

- A bent terminal
- A backed out terminal
- A damaged terminal
- Poor terminal tension
- A chafed wire

^ When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.
^ Refer to Shift Solenoid Valve State and Gear Ratio table.

TEST DESCRIPTION

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

6. This step verifies that the 2-3 Shift Solenoid Valve is operating and that an intermittent problem may have set the DTC.
9. This step isolates circuit 1223 of the Engine Wiring Harness for an open or a short to power.
11. This step isolates circuit 1223 for a short to power.
16. This step measures for a short to ground in circuit 1223.