Test Description

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. 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.

4. This step tests for voltage to the solenoid.
5. This step tests the ability of the PCM and wiring to control the ground circuit.
7. This step tests the resistance of the TCC PWM solenoid valve and the automatic transmission (AT) wiring harness assembly.

Fig 1: DTC P1860 - 5.3L (Steps 1-6)

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Fig 2: DTC P1860 - 5.3L (Steps 7-14)

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Fig 3: DTC P1860 - 5.3L (Steps 15-21)

Courtesy of GENERAL MOTORS CORP.