Test Description

WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.

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

2. This step tests the ability of the PCM to command the PC solenoid valve.
3. This step tests the PC solenoid valve and automatic transmission (AT) wiring harness assembly for incorrect resistance.

Fig 1: DTC P0748 - 4.3L (1 Of 3)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC P0748 - 4.3L (2 Of 3)

Courtesy of GENERAL MOTORS CORP.

Fig 3: DTC P0748 - 4.3L (3 Of 3)

Courtesy of GENERAL MOTORS CORP.