DTC EFI-541

5-4-1 CANISTER PURGE VALVE, SIGNAL

Trouble Code Conditions
- Diagnostic trouble code (DTC) EFI-541, canister purge (CP) valve, signal is stored if the engine control module (ECM) registers a fault in the canister purge valve coil or cables after 5 seconds.

Substitute value(s)
- Twin heated oxygen sensor (HO2S) fuel trim is disabled.
- The electrical test of the front heated oxygen sensor is disabled.
- The electrical test of the rear heated oxygen sensor is disabled.
- The pulsed secondary air injection system (PAIR) test is disabled.
- The heated oxygen sensor aging test is disabled.
- The three-way catalytic converter (TWC) test is disabled.
- Leak diagnostic disabled.
- Fuel shut-off conditions changed.

Possible source(s)
Signal too high:
- Short-circuit to supply voltage in signal cable.
- Defective canister purge valve.

Signal too low:
- Short-circuit to ground in signal cable.

Signal missing:
- Open-circuit in signal or power cable.
- Defective canister purge valve.

Fault symptom(s)
- May result in poor performance.
- May result in fuel odor.
- May result in uneven idling.