P0753

DIAGNOSTIC TROUBLE CODE (DTC) P0753 1-2 SHIFT SOLENOID ELECTRICAL





Circuit Description
The 1-2 Shift Solenoid Valve (1-2 SS Valve) is used to control fluid flow acting on the 1-2 shift valve. The solenoid is a normally open valve that is used in conjunction with the 2-3 Shift Solenoid Valve (2-3 SS Valve) to allow four different shifting combinations (Refer to Shift Solenoid Chart). The solenoid is attached to the valve body within the transmission. Voltage is supplied directly to the solenoid through the Powertrain Control Module (PCM).
The PCM commands the solenoid ON or OFF by providing a ground path through circuit 500.
When the PCM detects a continuous open, short to ground, or short to power in the 1-2 SS valve circuit, the DTC P0753 sets.

Conditions For Setting The DTC
- The ignition is in RUN.
- The PCM commands the solenoid ON and the voltage remains high for 4.3 seconds.

Action Taken When The DTC Is Set
- PCM will illuminate the Malfunction Indicator Lamp (MIL) after two consecutive trips with a failure reported.
- Freeze shift adapts from being updated.
- PCM inhibits TCC engagement.
- PCM commands maximum line pressure.
- PCM commands soft landing to 2nd gear.
- DTC P0753 will be stored in PCM memory.

Conditions For Clearing The DTC
- The PCM will turn the MIL off after DTC P0753 passes condition test. This DTC passes when all conditions for setting the DTC are met and the ignition is off long enough to power down the PCM.
- History DTCs can be cleared by using a Scan Tool.





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Diagnostic Aids
- If the DTC cannot be reset after clearing the code, check for possible fluid contamination, plugged or restricted oil circuit.
- Inspect the wiring for poor electrical connections at the PCM and at the transmission 20-way connector. Look for possible bent, backed out, deformed or damaged terminals. Check for weak terminal tension as well. Also check for chafed wires that could short to bare metal or other wiring. Inspect for broken wire inside the insulation.
- If diagnosing for a possible intermittent short or open condition, move or massage the wiring harness while observing test equipment for a change.





Shift Solenoid Status Chart

DTC P0753 - 1-2 Shift Solenoid Electrical





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