DTC P0627-12: Fuel Pump "A" Control Circuit Short to Battery [08/2020 - 08/2021]: Procedure
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, 2021 Lexus ES 300h, and 2020 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
- INSPECT ECM (CHECK FOR SHORT)
*a Front view of wire harness connector
(to Fuel Pump Control ECU)- Disconnect the fuel pump control ECU connector.
- Turn the power switch on (IG).
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition N19-2 (FPC) - Body ground Power switch on (IG) Below 1 V Result
Proceed to OK NG
Result:
OK
REPLACE FUEL PUMP CONTROL ECU. Refer to REMOVAL [06/2018 - 08/2021]
Result:
NG
See step 2
- CHECK HARNESS AND CONNECTOR (FUEL PUMP CONTROL ECU - ECM)
- Disconnect the fuel pump control ECU connector.
- Disconnect the ECM connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition N19-2 (FPC) or A26-6 (FPC) - Other terminals Always 10 kΩ or higher Result
Proceed to OK NG
Result:
OK
REPLACE ECM. Refer to REMOVAL [08/2020 - 08/2021]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR