EGR Valve: Testing and Inspection
EGR VALVE INSPECTIONResistance Inspection
NOTE: Perform the following test only when directed.
1. Disconnect the negative battery cable.
2. Inspect resistance of the EGR valve coils.
- If not as specified, replace the EGR valve.
- If as specified, carry out the "Circuit Open/Short Inspection".
Circuit Open/Short Inspection
1. Disconnect the PCM connector.
2. Inspect the following wiring harnesses for open or short circuit (continuity check).
Open circuit
- If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
- EGR valve terminal E and PCM terminal 4D
- EGR valve terminal A and PCM terminal 4G
- EGR valve terminal B and PCM terminal 4J
- EGR valve terminal F and PCM terminal 4M
- EGR valve terminal C or D and main relay terminal C
Short circuit
- If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- EGR valve terminal E and Ground
- EGR valve terminal A and Ground
- EGR valve terminal B and Ground
- EGR valve terminal F and Ground
- EGR valve terminal C or D and power supply
3. Remove the EGR valve, and inspect for any damage or clogging.
- If there is no damage or clogging, replace the EGR valve.