DTC 32

Fig. 041 - WIRING DIAGRAM for Code 32 EGR Vacuum Control. VIN 3, VIN L:

CODE 32

EXHAUST GAS RECIRCULATION

(EGR) VACUUM CONTROL

3.8L "A & C" SERIES

FUEL INJECTION (PORT)

The EGR Vacuum Control has an 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 senses vacuum at idle, or if it does not sense vacuum in gear with moderate to heavy engine load, but less than WOT.
The EGR valve is energized based on the following inputs:
a. Engine running above idle, but less than WOT.
b. Code 33 or 34 not present.
c. Engine coolant temperature 42.5°C (108°F) or above.
d. Transmission in gear.

Fig. 040 - Chart - Code 32 EGR Vacuum Control:

1. Checks for presence of vacuum to EGR valve at idle. This would be indicated by a closed vacuum switch.
2. Grounding the test terminal of the ALCL causes the ECM to energize the solenoid by grounding CKT 435. The test light should be on.
3. Light "ON" indicates vacuum at EGR. Vacuum should not be present.
4. A "SERVICE ENGINE SOON" light "OFF" at this point indicates the vacuum switch is open, as it should be.
5. A "SERVICE ENGINE SOON" light "ON" indicates CKT 932 or wire from terminal "C" to vacuum switch possibly shorted to ground, or contacts stuck closed in the EGR vacuum diagnostic switch. If the diagnostic switch requires replacement, it is serviced separate from the EGR solenoid.