Signal Too High. Intermittent Fault

Signal too high. Intermittent fault

EFI-521 Front heated oxygen sensor (HO2S), preheating EFI-522 Rear heated oxygen sensor (HO2S), preheating

Checking cables and terminals








- Check cable between heated oxygen sensor (HO2S) terminal 2 and engine control module (ECM) #A14 (for diagnostic trouble code (DTC) EFI-521)/ #A29 (for diagnostic trouble code (DTC) EFI-522) for an intermittent short-circuit to supply voltage according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.

Continue - Fault-tracing information
Fault-tracing information

-------------------------------------------------

Fault-tracing information




Information

Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Do you want to view the information again?

Yes - Attempt New Test

No - FAULT FOUND

------------------------

Attempt New Test - Checking cables and terminals

-------------------------------------------------