W/Harness Inspection

P0748 Pressure Control Solenoid Valve (VFS) \'A\' Electrical

Inspection/Repair - W/Harness Inspection

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?






Power Circuit Inspection

1. Check signal waveform
(1) Connect "A/T SOLENOID VALVE" connector and install device for measuring wave form.
(2) Turn on the Engine and Drive in normal condition.
(3) Measure wave form between "LINEAR SOLENOID" terminal of the sensor harness connector and chassis ground.









Wave form of LINEAR SOLENOID




(4) Is measured normally operating wave form?





2. Check open or short to ground in the power harness
(1) Ignition "OFF".
(2) Disconnect "A/T SOLENOID VALVE" connector and "PCM/TCM" connector.
(3) Measure resistance between "LINEAR SOLENOID" terminal of the ATM SOLENOID VALVE harness and chassis ground.
(4) Measure resistance between "LINEAR SOLENOID" terminal of the ATM SOLENOID VALVE harness connector and "LINEAR SOLENOID" terminal of the PCM/TCM harness connector.

Specification :In case of open - approx. 0 Ohms
In case of short to ground - Infinite








(5) Is measured normally operating wave form?






Signal Circuit Inspection

1. Check Signal Circuit Open Inspection
(1) Ignition "OFF".
(2) Disconnect "A/T SOLENOID VALVE" connector and "PCM/TCM" connector.
(3) Measure resistance between "LINEAR SOLENOID" terminal of the ATM SOLENOID VALVE harness connector and "LINEAR SOLENOID" terminal of the PCM/TCM harness connector.

Specification :Approx. 0 Ohms








(4) Is resistance within specifications?





2. Check Signal Circuit Short Inspection
(1) Ignition "OFF".
(2) Disconnect "A/T SOLENOID VALVE" connector and "PCM/TCM" connector.
(3) Measure resistance between "LINEAR SOLENOID" terminal of the ATM SOLENOID VALVE harness and chassis ground.

Specification :Infinite








(4) Is resistance within specifications?