DTC P023F Fuel Pump Secondary Circuit/Open: Notes
DTC detecting condition:
Immediately at fault recognition
CAUTION:
- After servicing or replacing faulty parts, perform Clear Memory Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Clear Memory Mode . and Inspection Mode Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Inspection Mode .
- Use the check board when measuring the ECM terminal voltage and resistance.
Wiring diagram:
Engine Electrical System Ref. to WIRING SYSTEM>Engine Electrical System>WIRING DIAGRAM .
- CHECK HIGH-PRESSURE FUEL PUMP.
Check the high-pressure fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>High Pressure Fuel Pump>INSPECTION .
Is the high-pressure fuel pump normal?
- Yes: Go to 2.
- No: Replace the high-pressure fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>High Pressure Fuel Pump .
- CHECK HARNESS BETWEEN ECM AND HIGH-PRESSURE FUEL PUMP CONNECTOR.
- Disconnect the connector from ECM.
- Disconnect the connector from high-pressure fuel pump.
- Measure the resistance of harness between ECM and high-pressure fuel pump connector.
Connector & terminal
(E158) No. 10 - (E160) No. 1:
(E158) No. 22 - (E160) No. 2:
Is the resistance less than 1 Ω?
- Yes: Go to 3.
- No: Repair the open circuit in harness between ECM and high-pressure fuel pump connector.
- CHECK HARNESS BETWEEN ECM AND HIGH-PRESSURE FUEL PUMP CONNECTOR.
Measure the resistance between high-pressure fuel pump connector and engine ground.
Connector & terminal
(E160) No. 1 - Engine ground:
(E160) No. 2 - Engine ground:
Is the resistance 1 MΩ or more?
- Yes: Repair the poor contact of ECM connector.
- No: Repair the short circuit to ground in harness between ECM and high-pressure fuel pump connector.