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(P0418) SECONDARY AIR INJECTION SYSTEM CONTROL CIRCUIT (CONTINUED) When Monitored and Set Condition • When Monitored: Once per driving cycle when the Engine is at idle, Air Pump was activated at start-up, Baro- • Set Condition: When the test is enabled, the O2 Sensor must increase by at least 23% (rich). POSSIBLE CAUSES AIR PUMP RELAY CONTROL CIRCUIT OPEN AIR PUMP RELAY CONTROL CIRCUIT SHORT TO GROUND AIR PUMP RELAY CONTROL CIRCUIT SHORT TO VOLTAGE AIR PUMP RELAY CONTROL CIRCUIT SHORT TO AIR PUMP RELAY OUTPUT CIRCUIT RELAY CONTROL MODULE POWERTRAIN CONTROL MODULE For a complete Powertrain Control Module Circuit Diagram, (Refer to 9 - ENGINE - SCHEMATICS AND DIA- Diagnostic Test 1. PRE-DIAGNOSTIC CHECK OUT Note: Always perform diagnostics with a fully charged battery. Note: Check connectors — Clean/repair as necessary. Poor pin to Note: Check for applicable TSBs related to the problem. With the DRB III T , read PCM DTCs. Using the wiring diagram/schematic as a guide, inspect the wiring and Perform this procedure prior to symptom diagnosis. Continue Go To 2 2. OPERATE THE AIR PUMP RELAY Note: If the PCM detects and stores a DTC, the PCM also stores T at the same time the DTC is displayed. Note: Record these conditions. Attempting to duplicate these With the DRB III T , actuate the AIRPUMP SWITCHOVER. Does the Air Pump run? Yes >> Go To 8 No >> Go To 3 ZH ENGINE - ELECTRICAL DIAGNOSTICS 9 - 437 |