P0748

DTC P0748 Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1)

DESCRIPTION

P0748:

Shifting from 1st to O/D is performed in combination with the ON and OFF operation of the shift solenoid valves SL1 and SL2, which are controlled by the ECM. If an open or short circuit occurs in either of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated safely.

Reference::

1. Reference: Inspect using an oscilloscope.
Check the waveform of the ECM connector.
OK: Refer to illustration.

MONITOR DESCRIPTION
This DTC indicates an open or short in the shift solenoid valve SL1 circuit. The ECM commands gear shifts by turning the shift solenoid valves ON/OFF. When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem, illuminates the MIL and stores the DTC. Also, the ECM performs the fail-safe function and turns the other normal shift solenoid valves ON/OFF. In case of an open or short circuit, the ECM stops sending current to the circuit.

MONITOR STRATEGY:

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS:

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS:

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE:

COMPONENT OPERATING RANGE

WIRING DIAGRAM:

WIRING DIAGRAM