Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information EFI-541

EFI-541 Canister purge (CP) valve, signal

Condition




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 (CP) valve coil or cables after 5 seconds.

Substitute value
- 2-heated oxygen sensor (HO2S) control disabled
- the electrical test of the front heated oxygen sensor (HO2S) is disabled
- the electrical test of the rear heated oxygen sensor (HO2S) is disabled
- the pulsed secondary air injection system (PAIR) test is disabled
- the heated oxygen sensor (HO2S) test is disabled
- the three-way catalytic converter (TWC) test is disabled
- leak diagnostic disabled
- fuel shut-off conditions changed.

Possible source

Signal too high:
- short-circuit to supply voltage in signal cable
- defective canister purge (CP) valve.

Signal too low:
- short-circuit to ground in signal cable

Signal missing:
- defective fuse 11B/5 (1998-)
- open-circuit in signal- or power cable
- defective canister purge (CP) valve.

Fault symptom[s]
- may result in poor performance
- may result in fuel odor
- may result in uneven idling.