Spark

DTC P0748

This circuit controls the pressure control solenoid through the transmission control module (TCM). The TCM outputs a duty cycle to control the line pressure. A ground return circuit is necessary for controlling the line pressure with a high level of accuracy.

When the transmission control module (TCM) sends an output duty cycle signal to activate the PC solenoid, but the return signal is received as OFF by the monitoring signal.

DTC P0748 is a Type B DTC.

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, disconnect the Q8 Control Solenoid Valve Assembly wiring harness plug and K71 TCM wiring harness plug.
2. Test for 2.9 Ω at 20°C (68°F) between the Q23 PC Solenoid Valve circuit terminal 3 and 5 or 3 and ground.

⇒	If not the specified value, test the Q23 PC Solenoid Valve signal circuits and ground return circuit for an open circuit, short circuit to voltage or short circuit to ground.

⇒	If the circuit is OK, replace the Q23 PC Solenoid Valve.

3. Test for continuity between the Q23 PC Solenoid Valve circuit terminal 3 and K71 TCM wiring harness plug terminal 1.
4. Test for continuity between the Q23 PC Solenoid Valve circuit terminal 5 and K71 TCM wiring harness plug terminal 2.

⇒	If the continuity is not normal, repair or replace the circuit.

5. If all circuits and the sensor test normal, replace the K71 TCM.

1. Disconnect the Q23 PC Solenoid Valve wiring harness plug.
2. Test for 2.9 Ω at 20°C (68°F) between the Q23 PC Solenoid Valve terminal and the transmission case.
3. If the resistance is too low or too high, replace the Q23 PC Solenoid Valve.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.