DTC P12D5-01: Fuel Pump Control General Electrical Failure [02/2019 - 06/2020]: Procedure

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the fuel pump control ECU.

   Refer to REMOVAL [02/2019 - 08/2020]

2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N14-2 (FPU) - N15-3 (GND)	Always	2 kΩ or higher
   N14-3 (FPV) - N15-3 (GND)	Always	2 kΩ or higher
   N14-4 (FPW) - N15-3 (GND)	Always	2 kΩ or higher

   HINT: 

   This procedure checks for an internal short of the fuel pump control ECU when its transistor is stuck on.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE FUEL PUMP CONTROL ECU 

Refer to REMOVAL [02/2019 - 08/2020]

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 voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Techstream Operation	Specified Condition
   N14-2 (FPU) - Body ground	U Phase	4.4 to 8.4 V*
   N14-3 (FPV) - Body ground		8 to 15.5 V
   N14-4 (FPW) - Body ground		8 to 15.5 V
   N14-3 (FPV) - Body ground	V Phase	4.4 to 8.4 V*
   N14-2 (FPU) - Body ground		8 to 15.5 V
   N14-4 (FPW) - Body ground		8 to 15.5 V
   N14-4 (FPW) - Body ground	W Phase	4.4 to 8.4 V*
   N14-2 (FPU) - Body ground		8 to 15.5 V
   N14-3 (FPV) - Body ground		8 to 15.5 V

   HINT: 

   • *: This Active Test limits the fuel pump control ECU output duty cycle to 50%. Therefore, the output voltage of the fuel pump control ECU will be approximately 50% of the power source voltage (+B terminal).
   • Before performing this inspection, check that the auxiliary battery voltage is between 11 and 14 V (not depleted).

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE FUEL PUMP CONTROL ECU 

Refer to REMOVAL [02/2019 - 08/2020]

Result: 

OK 

See step  3

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N14-2 (FPU) or N46-3 (BLPU) - Body ground and other terminals	Always	10 kΩ or higher
   N14-3 (FPV) or N46-4 (BLPV) - Body ground and other terminals	Always	10 kΩ or higher
   N14-4 (FPW) or N46-2 (BLPW) - Body ground and other terminals	Always	10 kΩ or higher

   HINT: 

   Perform "Inspection After Repair" after replacing the fuel pump (for low pressure side).

   Refer to INITIALIZATION [02/2019 - 10/2019] , or refer to INITIALIZATION [10/2019 - 08/2020]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE) 

Refer to REMOVAL [02/2019 - 08/2020]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR