Chrysler Sebring 2004 Service Manual page 2337

DRIVEABILITY - NGC
Symptom List:
P0491-AIR INJECTION SYSTEM PERFORMANCE
P2431-MAF SENSOR PERFORMANCE
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0491-AIR INJECTION SYSTEM
PERFORMANCE.
When Monitored and Set Condition:
P0491-AIR INJECTION SYSTEM PERFORMANCE
When Monitored: Engine Running. The Air Injection Pump is active for a calibrated
amount of time. Once enough air flow has accumulated through the Air Injection system
the test will begin.
Set Condition: If the PCM detects excessive air flow or not enough air flow though the Air
Injection system a fault is recorded. Two Trip Fault.
P2431-MAF SENSOR 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.
GOOD TRIP EQUAL TO ZERO
VISUAL AND PHYSICAL INSPECTION OF THE AIR INJECTION SYSTEM
FUSED BATTERY VOLTAGE OUTPUT CIRCUIT
AIR INJECTION PUMP RELAY
AIR INJECTION PUMP GROUND CIRCUIT
AIR INJECTION PUMP MOTOR
ASD RELAY OUTPUT CIRCUIT
MAF SENSOR INTERNAL FAILURE
MAF SIGNAL CIRCUIT SHORTED TO ASD RELAY OUTPUT CIRCUIT
MAP 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
POSSIBLE CAUSES
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