DTC EFI-445

4-4-5 PULSED SECONDARY AIR INJECTION SYSTEM PUMP, SIGNAL





Trouble Code Conditions
- Diagnostic trouble code (DTC) EFI-445 is stored if the pulsed secondary air injection system (PAIR) pump signal cable is short-circuited to ground or supply voltage, or if there is an open-circuit in the circuit.

Substitute value(s)
- Pulsed secondary air injection system diagnostic disabled.
- Front and rear heated oxygen sensor (HO2S) diagnostic disabled.
- Fuel trim disabled.

Possible source(s)
Signal too high:
- Short-circuit to supply voltage in signal cable.
- Defective pulsed secondary air injection system pump relay.

Signal too low:
- Open-circuit in signal cable or power cable.
- Short-circuit to ground in signal cable.
- Contact resistance in terminals.
- Defective pulsed secondary air injection system pump relay.

Fault symptom(s)
- Pulsed secondary air injection system pump can run continuously.