DTC P0627-12: Fuel Pump "A" Control Circuit Short to Battery [11/2018 - 08/2020]: Procedure

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the fuel pump control ECU connector.
2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   N15-2 (FPC) - Body ground	Ignition switch ON	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  3

Result: 

OK 

See step  2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the fuel pump control ECU connector.
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch to ON.
4. Turn the Techstream on.
5. Enter the following menus: Powertrain / Engine / Active Test / Fuel Pump Single Phase Energization.

   Powertrain > Engine > Active Test 

   Tester Display
   Fuel Pump Single Phase Energization

6. Operate the fuel pump control ECU using the Active Test function and measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Techstream Operation	Specified Condition
   N15-2 (FPC) - Body ground	Before Active Test → During Active Test	Before Active Test: Resistance is stable → During Active Test: Resistance fluctuates*

   HINT: 

   *: Using the Active Test, duty control of the transistors in the ECM will be performed. Due to the duty control, resistance of the FPC terminal will be unstable during the Active Test. If the resistance is stable before the Active Test and fluctuates while performing the Active Test, it can be determined that the transistor is operating. If the transistor does not operate during the Active Test, the ECM may be malfunctioning.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE FUEL PUMP CONTROL ECU. Refer to  REMOVAL [11/2018 - 08/2020] 

Result: 

NG 

REPLACE ECM. Refer to  REMOVAL [11/2018 - 08/2020] 

1. Disconnect the fuel pump control ECU connector.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N15-2 (FPC) or A24-6 (FPC) - Other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ECM. Refer to  REMOVAL [11/2018 - 08/2020] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR