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 items affecting ECM block learn values.

• EGR Passages Restricted Or Blocked.
• MAP Sensor - See I - SYS/COMP TESTS article in the ENGINE PERFORMANCE section.

Fig 1: Code 32 Schematic - EGR System Error

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code 32 Flow Chart - EGR System Error

Courtesy of GENERAL MOTORS CORP.