Code 32 - EGR System Failure

Code 32 means 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 176°F (80°C), EGR duty cycle commanded by the ECM is greater than 27 percent and TPS at less than half throttle, but not idle. Codes 21, 22, 33 or 34 not present. All conditions must be met for about 4 minutes.

1. This test will determine if the ECM set the Code 32 due to circuit 935 being grounded on start-up. If the code does not repeat, but the customer complained of a check engine light after start-up, then this circuit should be checked carefully for an intermittent grounded condition.
2. If Code 32 repeated, then disconnect the EGR temperature switch and try to reset the code. This will determine if the ECM, wiring or temperature switch is at fault.
3. This test will check for a possible open in circuit 935. The ECM supplies 9-12 volts to circuit 935.
4. By grounding the diagnostic terminal, the EGR solenoid should close, allowing vacuum to be applied. The vacuum should hold.
5. This test will determine if the electrical control part of the system is at fault or if the connector or solenoid are at fault.
6. By plugging the EGR valve side and ungrounding the diagnostic terminal, the solenoid valve should open and allow vacuum to bleed off through the vent.
7. With the engine not running and vacuum is applied to the valve, the valve should move to the fully open position.
8. These engines use a negative back pressure valve, the valve should close when the engine is cranked over.

Fig 1: Code 32 Flow Chart, EGR System Failure

Fig 2: Code 32 Flow Chart, EGR System Failure (1 Of 2)

Fig 3: Code 32 Flow Chart, EGR System Failure (2 Of 2)

Fig 4: Code 32 Schematic, EGR System Failure