Operation Test
- Remove "V" bank cover from top of engine. Disconnect EGR valve connector. Drain coolant. Remove and inspect EGR valve. Replace EGR valve if pintle inside valve is contaminated with heavy carbon deposits. If pintle is not heavily contaminated, connect jumper wires between battery positive terminal and terminals B1 and B2 of EGR valve connector. See Fig 1.
- Connect jumper wires to battery negative terminal (these wires will be used to ground terminals at EGR valve). Check EGR valve operation by opening and closing the pintle as follows. If pintle does not open and close, replace EGR valve.
- Closing Pintle
Ground terminal S4 with one jumper wire and terminal S3 with other jumper wire. Keep terminal S3 grounded. Disconnect jumper wire from terminal S4 and connect it to terminal S2. Keep terminal S2 grounded. Disconnect jumper wire from terminal S3 and connect it to terminal S1. Keep terminal S1 grounded. Disconnect jumper wire from terminal S2 and connect it to terminal S4. Continue to follow this sequence until pintle is closed.
- Opening Pintle
Ground terminal S1 with one jumper wire and terminal S2 with other jumper wire. Keep terminal S2 grounded. Disconnect jumper wire from terminal S1 and connect it to terminal S3. Keep terminal S3 grounded. Disconnect jumper wire from terminal S2 and connect it to terminal S4. Keep terminal S4 grounded. Disconnect jumper wire from terminal S3 and connect it to terminal S1. Continue to follow this sequence until pintle is closed.