Possible Causes
| Possible Causes |
|---|
| OBSTRUCTION OR LEAK IN THE SECONDARY AIR SYSTEM |
| (A929) FUSED B+ CIRCUIT OPEN OR HIGH RESISTANCE |
| (Z931) GROUND CIRCUIT OPEN OR HIGH RESISTANCE |
| (A161) SECONDARY AIR PUMP CONTROL OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE |
| (K157) SAF SIGNAL CIRCUIT SHORT TO VOLTAGE |
| (K157) SAF SIGNAL CIRCUIT SHORT TO GROUND |
| (K157) SAF SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE |
| (K957) SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE |
| SECONDARY AIR PUMP RELAY |
| AIRFLOW SENSOR |
| SECONDARY AIR CHECK VALVE |
| SECONDARY AIR PUMP |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .