P2431

Test 1 - 4:

Test 5 - 8:

Test 9 - 11:

SYMPTOM
P2431-MAF SENSOR PERFORMANCE

TEST NOTE
This symptom is diagnosed using the test P0491-AIR INJECTION SYSTEM PERFORMANCE.

WHEN MONITORED
Engine Running. No other MAF sensor faults are present. Air Injection System is active.

SET CONDITION
The PCM detects the MAF sensor has an excessive amount of air flow or not enough air flow though it. Two Trip Fault.

POSSIBLE CAUSES
- Good trip equal to zero
- Visual and physical inspection of the air injection system
- ASD relay output circuit
- MAF sensor internal failure
- MAF signal circuit shorted to ASD relay output circuit
- MAF signal circuit shorted to battery voltage
- MAF signal circuit open
- MAF signal circuit shorted to ground
- MAF signal circuit shorted to (K4) sensor ground circuit
- Sensor ground circuit open
- PCM