P0411 - Secondary Air Injection (AIR) system upstream flow
The secondary air injection system does not detect the presence of air in the exhaust when introduced by the secondary air injection system.
- AIR bypass solenoid circuit open.
- AIR bypass solenoid leaking/blocked or stuck open/closed.
- Electric AIR pump - no/low air flow.
- AIR diverter valve leaking/blocked or stuck open/closed.
- AIR air hoses restricted or leaking.
- AIR vacuum hoses restricted or leaking.
In order to test the AIR pump, it must be capable of driving the HO2S lean.
A single electrical circuit open, such as an AIR bypass solenoid, in this multi-component circuit will not be detected by a PCM output driver circuit, yet it will create DTC P0411.
P0455 - EVAP Control System Leak Detected (No Purge Flow or Large Leak)
The PCM monitors the complete EVAP control system for no purge flow, the presence of a large fuel vapor leak, or multiple small fuel vapor leaks. System failure occurs when no purge flow (attributed to fuel vapor blockages or restrictions), a large fuel vapor leak, or multiple fuel vapor leaks are detected by the EVAP Running Loss monitor test with the engine running (but not at idle).
- After-market EVAP hardware (such as fuel filler cap) non-conforming to required specifications.
- Disconnected or cracked fuel EVAP canister tube, EVAP canister purge outlet tube, or EVAP return tube.
- EVAP canister purge valve stuck closed.
- Damaged EVAP canister.
- Damaged or missing fuel filler cap.
- Insufficient fuel filler cap installation.
- Loose fuel vapor hose/tube connections to the EVAP system components.
- Blockages or restrictions in the fuel vapor hoses/tubes (items also listed under disconnections or cracks).
- Fuel vapor control valve tube assembly or fuel vapor vent valve assembly blocked.
- Canister vent (CV) solenoid stuck open.
- Mechanically inoperative fuel tank pressure (FTP) sensor.
Check for audible vacuum noise or significant fuel odor in the engine compartment or near the EVAP canister and fuel tank.
P0480 - Cooling Fan Electrical Malfunction
Variable Speed Electric Cooling Fan
This test checks the Fan Control - Variable (FCV) output circuit. The DTC sets if the PCM detects the voltage on the FCV circuit is not within the expected range.
- FCV circuit open or shorted.
- B+ or ground circuit fault to cooling fan.
- VPWR open to cooling fan (if applicable).
- Damaged cooling fan module.
- PCM damaged.
During the KOEO self-test, the cooling fan is cycled on and off.
P0660 - Intake Manifold Tuning Valve (IMTV) Control Circuit Open - Bank 1
The IMTV system is monitored for failure during continuous, KOEO, or KOER self-tests. The test fails when the signal on the monitor pin is more or less than an expected calibrated range.
- IMTV signal circuit open, shorted to PWR GND or SIG RTN.
- Damaged IMTV actuator.
- Damaged PCM.
An IMTVM PID reading may indicate a fault if available.
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