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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 874 (Automatic Transaxle Diagnosis, Service & Repair - 4T65-E) >> Diagnostic Information and Procedures >> DTC P1826: IMS Signal C Is High While The Vehicle Is Being Driven In A Forward Gear >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table

  1. 3. This step tests the integrity of the engine harness and PCM by checking for the Signal C state change from HI to LOW. A LOW signal indicates the fault is either in the internal transmission harness or the switch. A HI signal indicates the fault is either in the engine harness or the PCM.
Fig 1: DTC P1826 Diagnosis (Steps 1-6)
G01501813Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC P1826 Diagnosis (Steps 7-10)
G01501814Courtesy of GENERAL MOTORS CORP.
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