Diagnostic Aids

The Code 32 chart is a functional check of the EGR system. If the EGR system works properly and a Code 32 has set, check for other causes for an increased open throttle block learn value.

• Check for a blocked/restricted intake and EGR passages.
• Check vacuum lines.
• Check MAP sensor function. A MAP sensor may shift enough in calibration to change air/fuel mixture without setting a MAP related code.

Fig 1: Code 32: EGR System Error (2.8L, 4.3L, S & T, & 5.7L Over 8500 GVWR)