LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 208 (Automatic Transmission - ALLISON - Diagnosis) >> Diagnostic Tests >> DTC P0731: Incorrect 1ST Gear Ratio >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The numbers listed below refer to step numbers in the diagnostic procedure:

  1. 3  - This step tests ignition voltage.
  2. 4  - This step tests for current 1st gear ratio.
  3. 5  - This step tests speed sensor readings.
  4. 6  - This step tests for clutch slippage in 1st gear shown by turbine speed not remaining at zero.
  5. 7  - This step checks for evidence of clutch failure.

scientia non olet · About LEMON Manuals