P0412: Secondary Air Injection (Air) System Circuit Malfunction
WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2004 Mercury Sable, 2004 Mercury Mountaineer, 2004 Mercury Monterey, 2004 Mercury Marauder, and 2004 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
P0412 - SECONDARY AIR INJECTION (AIR) SYSTEM CIRCUIT MALFUNCTION
| Description: | On the primary side of the AIR relay, open and short faults on the AIR command circuit are detected during normal operation by the PCM output driver. | ||
| Possible Causes: |
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| Diagnostic Aids: | A single open AIR component, solenoid, or relay on this multi-component circuit is not detected by a PCM output driver circuit, yet it generates DTC P0411 for a solenoid open or P2257 for a relay open. For intermittent faults consider using the AIR PCM output driver fault PID AIRF with a harness wiggle test with the AIR PCM output driver in OFF and ON states. The AIR PCM output driver fault PID AIRF instantly detects open circuits and shorts to ground with the PCM output driver off. The AIR PCM output driver fault PID AIRF instantly detects a short to power or low resistance load with the PCM output driver on. Use the OTM or OSC to toggle the PCM output driver from OFF to ON. (REFER to OUTPUT TEST MODE ). | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to PINPOINT TEST HM: SECONDARY AIR INJECTION (AIR) SYSTEM Step 1. | GO to PINPOINT TEST HM: SECONDARY AIR INJECTION (AIR) SYSTEM Step 1. | GO to PINPOINT TEST HM: SECONDARY AIR INJECTION (AIR) SYSTEM Step 9. |