Code 32 - EGR System Failure
Code 32 indicates that the EGR diagnostic switch was closed during start-up or that the switch was not detected closed under the following conditions: Coolant temperature greater than 194° (94°C). EGR duty cycle controlled by ECM, greater than 50%. TPS less than wide open throttle, but above 5%. All listed conditions must be met for about 4 minutes.
If switch is detected closed during start-up, the "CHECK ENGINE" light will come "ON" within 40 seconds and stay on until the switch is detected open or until the engine is turned "OFF". However, if the switch is detected open when the above conditions are met, the "CHECK ENGINE" light will only remain "ON" while all conditions are met.
The EGR vacuum control uses an ECM controlled pulse width modulated EGR solenoid. The valve is normally closed and vacuum source is a ported signal. The ECM will turn EGR "ON" and "OFF" (duty cycle) by grounding circuit 435. The duty cycle is calculated by the ECM based on information from coolant, MAP sensor, TPS sensor and engine RPM. Duty cycle should be zero (no EGR) when in Park or Neutral, if TPS input is below a specified value or if TPS indicates wide open throttle.
With ignition "ON", engine stopped, the EGR solenoid is de-energized. The solenoid, however, should be energized if the diagnostic terminal is grounded under the same conditions.
- This step checks circuit 935 for short to ground during start-up or temperature switch stuck closed.
- This step checks to see if fault is switch or if it is faulty wiring to ECM.
- This step check for an open in circuit 935.
- This step determines whether control solenoid, wiring or ECM is faulty.