DTC 32

Chart - Code 32 EGR Vacuum Control:

Wiring Diagram for EGR Vacuum Control:

CODE 32
EXHAUST GAS RECIRCULATION (EGR) CIRCUIT



Circuit Description:
The exhaust gas recirculation (EGR) vacuum control has an electronic control module (ECM) controlled solenoid that pulses manifold vacuum to the EGR valve, The solenoid is always de-energized (EGR "OFF") in "park" or "neutral" and at idle. Another part of the control is a vacuum diagnostic switch, which is open with no vacuum applied. Its purpose is to signal the ECM, when vacuum is actually being applied to the EGR valve. Code 32 will be set if the EGR diagnostic vacuum switch does not sense vacuum with moderate to heavy engine load, but less than wide open throttle (WOT). The EGR valve is energized based on the following inputs:
Engine running above idle, but less than WOT
Code 33 or 34 not present
Engine coolant temperature above 80 degrees C (176 degrees F)


Test Description: Numbers below refer to circled numbers on the diagnostic chart.
1. Be sure to check for presence of vacuum at throttle body side of EGR solenoid before continuing test.
2. Grounding the test terminal of the assembly line data link (ALDL) causes the ECM to energize the solenoid by grounding CKT 471. The test light should be "ON."