Diagnostic Aids

The Code 32 diagnostic flow chart is a functional check of the EGR system. If the EGR system is working correctly, but a Code 32 has been set, check the following other items that affect ECM block learn values:

• EGR passages, restricted or blocked.
• MAP sensor, see SYSTEMS & COMPONENT TESTING article.

Fig 1: Code 32, Circuit Wiring Diagram & Flow Chart

Courtesy of GENERAL MOTORS CORP.