P0404

Tests 1 - 2:

Tests 3 - 7:

Tests 8 - 11:

Test 12:

SYMPTOM
P0404 - EGR POSITION SENSOR RATIONALITY

SET CONDITION
The EGR flow or valve movement is not what is expected.

POSSIBLE CAUSES
- High resistance in 5 volt supply
- 5 Volt supply circuit output
- EGR sensor signal circuit open
- EGR assembly
- EGR solenoid control CKT
- Intermittent condition
- EGR Sensor signal circuit open
- EGR Sensor Signal circuit shorted to ground
- Sensor ground circuit open
- EGR assembly (ground)
- PCM