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DTC 32 - EGR FUNCTION
DO NOT perform this test if DTC 12 is present.
1. Check Vacuum Source To EGR Valve
Start engine and warm to operating temperature. Disconnect hose from EGR valve and check vacuum. Vacuum should not be present. Raise engine speed to about 2000 RPM and check vacuum. Vacuum should be present. If vacuum not as specified, go to next step. If vacuum as specified, inspect EGR system. Repair or replace as necessary.
2. Check Control Function
If vacuum is not present at about 2000 RPM, measure voltage between ECM terminal No. 105 (White/Blue wire) and ground. See Fig. 2 and Fig. 24. At idle, voltage should be about zero volts. At 2000 RPM, voltage should be battery voltage. If voltage is not as specified, go to next step. If voltage is as specified, inspect vacuum hose for clogging, cracks or proper connection. Repair vacuum hose as necessary.
3. Check Power Supply
Turn ignition off. Disconnect EGRC solenoid valve wiring harness connector. See Fig. 23. Turn ignition on. Measure voltage between harness connector terminal "B" (Black/White wire) and ground. See Fig. 25. If battery voltage is not present, check wiring harness and harness connectors. Repair or replace as necessary. If battery voltage is present, go to next step.
4. Check Output Signal Circuit
Turn ignition off. Disconnect ECM harness connector. Check continuity
between ECM terminal No. 105 and EGRC solenoid valve wiring harness connector terminal "a" (White/Blue wire) See Fig. 2 and Fig. 26. If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
5. Check Component
Inspect EGRC solenoid valve (On California models, measure resistance of EGR temp. Sensor). Repair or replace components as necessary.
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Tuesday, May 31st, 2011 AT 12:50 PM