DTC P12D0-13: Fuel Pump Control (All Phase) Circuit Open; DTC P12D1-13: Fuel Pump Control (U Phase) Circuit Open; DTC P12D2-13: Fuel Pump Control (V Phase) Circuit Open; DTC P12D3-13: Fuel Pump Control (W Phase) Circuit Open [02/2024 - ]: Procedure

HINT: 

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

Pre-procedure1

1. Disconnect the N8 fuel pump control ECU connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1

   Fuel Pump Control ECU

   -

   -

   Procedure1

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

   Powertrain > Engine > Active Test 

   Tester Display
   Fuel Pump Single Phase Energization

   Standard Voltage

   Tester Connection	GTS Operation	Specified Condition
   N8-2 (FPU) - Body ground	U Phase	4.4 to 8.4 V*
   N8-3 (FPV) - Body ground	V Phase	4.4 to 8.4 V*
   N8-4 (FPW) - Body ground	W Phase	4.4 to 8.4 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

   Post-procedure1

3. None

Result: 

NG 

REPLACE FUEL PUMP CONTROL ECU 

Refer to REMOVAL [02/2024 - ]

Result: 

OK 

See step  2

HINT: 

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

Pre-procedure1

1. Disconnect the fuel pump control ECU connector.
2. Disconnect the fuel pump (for low pressure side) connector.

   Procedure1

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N8-2 (FPU) - N5-3 (BLPU)	Always	Below 1 Ω
   N8-3 (FPV) - N5-4 (BLPV)	Always	Below 1 Ω
   N8-4 (FPW) - N5-2 (BLPW)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

   Post-procedure1

4. None

Result: 

OK 

REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE) (FUEL PUMP WITH FILTER ASSEMBLY) 

Refer to REMOVAL [02/2024 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR