DB - Testing Notes

NOTE: You should enter this Pinpoint Test only when you have been directed here form Quick Test.

REMEMBER

To prevent the replacement of good components, be aware that the following non-EEC areas may be at fault.

- Damaged EGR valve

- Damaged EGR transducer

- Stuck throttle plate

- Restricted exhaust system

- Damaged vacuum lines, reservoir or canister




This Pinpoint Test is intended to diagnose only the following:

- EGRT sensor

- Harness circuits: EGRT and SIG RTN

- Processor assembly


DESCRIPTION


The EGR Temperature (EGRT) sensor resistance varies with temperature. It is located downstream of the EGR valve and its resistance decreases as EGR flow increases. The EEC processor uses the EGRT sensor input as an indication that the EGR system is functioning properly.