Fuel Pump Control Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed.
5. Check whether operating sounds can be heard while operating the fuel pump using the Techstream.

   OK

   Operating sounds can be heard from fuel pump.

NG → See step   2 

OK → See step   16 

1. Inspect the circuit opening relay (C/OPN). Refer to ON-VEHICLE INSPECTION - Step 1 .

NG → REPLACE CIRCUIT OPENING RELAY (C/OPN) 

OK: Go to next step 

Fig 1: Identifying Circuit Opening Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the circuit opening relay (C/OPN) from the engine room relay block.
2. Turn the engine switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   C/OPN relay (2) - Body ground	Engine switch on (IG)	11 to 14 V
   C/OPN relay (5) - Body ground	Engine switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *1	Engine Room Relay Block
   *2	Circuit Opening Relay (C/OPN)

NG → See step   10 

OK: Go to next step 

1. Remove the circuit opening relay (C/OPN) from the engine room relay block.
2. Disconnect the ECM connector.
3. Disconnect the fuel pump ECU connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C/OPN relay (1) - G45-8 (FC)	Always	Below 1 Ω
   C/OPN relay (3) - S7-4 (+B)	Always	Below 1 Ω
   C/OPN relay (1) or G45-8 (FC) - Body ground	Always	10 kΩ or higher
   C/OPN relay (3) or S7-4 (+B) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   S4-4 (B2) - S8-1 (FP)	Always	Below 1 Ω
   S4-5 (E2) - S8-2 (FP-)	Always	Below 1 Ω
   S4-4 (B2) or S8-1 (FP) - Body ground	Always	10 kΩ or higher
   S4-5 (E2) or S8-2 (FP-) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Inspect the fuel pump. Refer to INSPECTION - Step 1 .

NG → See step   13 

OK: Go to next step 

1. Disconnect the fuel pump 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
   S7-1 (FPC) - G44-3 (FPC)	Always	Below 1 Ω
   S7-2 (DI) - G45-26 (DI)	Always	Below 1 Ω
   S7-3 (E) - Body ground	Always	Below 1 Ω
   S7-1 (FPC) or G44-3 (FPC) - Body ground	Always	10 kΩ or higher
   S7-2 (DI) or G45-26 (DI) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the fuel pump ECU. Refer to REMOVAL .

NEXT: Go to next step 

1. Check the fuel pump operation.

   OK

   Malfunction has been repaired successfully.

NG → See step   14 

OK → END 

1. Remove the circuit opening relay (C/OPN) from the engine room relay block.
2. Remove the fuel pump relay (F/PMP) from the engine room relay block.
3. Remove the No. 1 integration relay from the engine room relay block.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C/OPN relay (2) - 1A-5	Always	Below 1 Ω
   C/OPN relay (5) - F/PMP relay (3)	Always	Below 1 Ω
   C/OPN relay (2) or 1A-5 - Body ground	Always	10 kΩ or higher
   C/OPN relay (5) or F/PMP relay (3) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Inspect the fuel pump relay (F/PMP). Refer to ON-VEHICLE INSPECTION - Step 6 .

NG → REPLACE FUEL PUMP RELAY (F/PMP) 

OK: Go to next step 

1. Remove the fuel pump relay (F/PMP) from the engine room relay block.
2. Remove the No. 1 integration relay from the engine room relay block.
3. Disconnect the No. 1 integration relay connector.
4. Disconnect the cable from the battery positive (+) terminal.
5. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F/PMP relay (1) - 1B-4	Always	Below 1 Ω
   F/PMP relay (5) - Positive (+) battery cable	Always	Below 1 Ω
   F/PMP relay (2) - Body ground	Always	Below 1 Ω
   F/PMP relay (1) or 1B-4 - Body ground	Always	10 kΩ or higher
   F/PMP relay (5) or Positive (+) battery cable - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   15