DTC P0402: EXCESSIVE EGR FLOW DETECTED Isuzu Amigo II

Note. For circuit reference (Схема №10)

Circuit Description

PCM closes EGR system on engine start-up to test for any flow. If PCM detects any EGR flow occurred on start-up, in 2 consecutive trips, DTC P0402 will be set. DTC is a "B" code.

Conditions required to set DTC are

1. IAT is above 41°F (5°C).
2. Engine speed is less than 500 RPM.
3. EGR pintle position is greater than 55 counts.

Diagnostic Aids

Inspect for poor connections or damaged connectors. Using scan tool, observe EGR POSITION while performing a wiring harness wiggle test. Ensure EGR is properly mounted. Check for sign of restricted exhaust.