DTC P1235: High Pressure Fuel Pump Circuit; DTC P1236: High Pressure Fuel Pump No. 2 Circuit [11/2021 - ]: Procedure

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Turn the engine switch off.
2. Interchange the No. 1 and No. 2 injector driver (EDU).
   NOTE:

   Do not disconnect and reconnect the connectors with the engine switch on (IG), as the injector driver (EDU) may be damaged.

3. Connect the Techstream to the DLC3.
4. Turn the engine switch on (IG).
5. Turn the Techstream on.
6. Clear the DTCs.
   NOTE:

   Before clearing the DTCs, write them down.

   Powertrain > Engine > Clear DTCs 

7. Start the engine.
8. Enter the following menus: Powertrain / Engine / Trouble Codes.
9. Read the DTCs.

   Powertrain > Engine > Trouble Codes 

   Result

   Result	Proceed to
   DTCs do not change	A
   DTCs change (change in malfunctioning cylinder or EDU code)	B

Result: 

B 

REPLACE INJECTOR DRIVER (EDU). Refer to  REMOVAL [11/2021 - ] 

Result: 

A 

See step  2

1. Inspect the fuel pump (for high pressure side).

   Refer to INSPECTION [11/2021 - ]

   HINT: 

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

   Refer to INITIALIZATION [11/2021 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE FUEL PUMP (FOR HIGH PRESSURE SIDE). Refer to  REMOVAL [11/2021 - ] 

Result: 

OK 

See step  3

1. Disconnect the injector driver (EDU) connector.
2. Disconnect the fuel pump (for high pressure side) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F165-3 (FP+) - F170-1 (FP1+)	Always	Below 1 Ω
   F165-4 (FP-) - F170-2 (FP1-)	Always	Below 1 Ω
   F191-3 (FP2+) - F183-1 (FP2+)	Always	Below 1 Ω
   F191-4 (FP2-) - F183-2 (FP2-)	Always	Below 1 Ω
   F165-3 (FP+) or F170-1 (FP1+) - Body ground	Always	10 kΩ or higher
   F165-4 (FP-) or F170-2 (FP1-) - Body ground	Always	10 kΩ or higher
   F191-3 (FP2+) or F183-1 (FP2+) - Body ground	Always	10 kΩ or higher
   F191-4 (FP2-) or F183-2 (FP2-) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Disconnect the ECM connector.
2. Disconnect the injector driver (EDU) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F155-10 (FPF1) - F164-7 (FPF1)	Always	Below 1 Ω
   F155-11 (FPD) - F164-8 (FPD)	Always	Below 1 Ω
   F155-12 (FPF2) - F190-7 (FPF2)	Always	Below 1 Ω
   F155-13 (FPD2) - F190-8 (FPD2)	Always	Below 1 Ω
   F155-10 (FPF1) or F164-7 (FPF1) - Body ground	Always	10 kΩ or higher
   F155-11 (FPD) or F164-8 (FPD) - Body ground	Always	10 kΩ or higher
   F155-12 (FPF2) or F190-7 (FPF2) - Body ground	Always	10 kΩ or higher
   F155-13 (FPD2) or F190-8 (FPD2) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ECM. Refer to  REMOVAL [11/2021 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR