Resistance Test
Disconnect EGR valve connector. See appropriate illustration in VACUUM DIAGRAMS article. Measure resistance between the following terminals of EGR valve connector.
- Terminals B1 and S1.
- Terminals B1 and S3.
- Terminals B2 and S2.
- Terminals B2 and S4.
If resistance is not 19.9-23.4 ohms at 68°F (20°C), replace EGR valve. If resistance is 19.9-23.4 ohms, check EGR valve operation.
CAUTION:
When checking EGR valve operation, DO NOT
apply battery voltage across terminals for more than a few seconds. Read the following procedure before performing it, as it contains a grounding sequence that must be followed exactly as specified.