Fuel Pump Control Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON and turn the Techstream on.
3. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed.
4. 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   15 

Fig 1: EFI Relay Terminal Identification

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the circuit opening relay (C/OPN) from the engine room relay block.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3 - 5	Battery voltage not applied	10 kΩ or higher
   	Battery voltage applied to terminals 1 and 2	Below 1 Ω

NG → See step   12 

OK: Go to next step 

Fig 2: 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 ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

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

   TEXT IN ILLUSTRATION
   
   

   *1	Engine Room Relay Block
   *2	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 control ECU connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   1 (C/OPN relay) - E77-8 (FC)	Always	Below 1 Ω
   3 (C/OPN relay) - O1-4 (+B)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   1 (C/OPN relay) or E77-8 (FC) - Body ground	Always	10 kΩ or higher
   3 (C/OPN relay) or O1-4 (+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 control ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   L5-4 - O2-1 (FP)	Always	Below 1 Ω
   L5-5 - O2-2 (FP-)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   L5-4 or O2-1 (FP) - Body ground	Always	10 kΩ or higher
   L5-5 or O2-2 (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 .

NG → See step   13 

OK: Go to next step 

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 (Check for Open)

   Tester Connection	Condition	Specified Condition
   O1-1 (FPC) - E78-3 (FPC)	Always	Below 1 Ω
   O1-2 (DI) - E77-26 (DI)	Always	Below 1 Ω
   O1-3 (E) - Body ground	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   O1-1 (FPC) or E78-3 (FPC) - Body ground	Always	10 kΩ or higher
   O1-2 (DI) or E77-26 (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 control 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 EFI relay (EFI) from the engine room relay block.
3. Disconnect the ignition switch connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   5 (C/OPN relay) - 3 (EFI relay)	Always	Below 1 Ω
   2 (C/OPN relay) - A1-6 (IG2)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   5 (C/OPN relay) or 3 (EFI relay) - Body ground	Always	10 kΩ or higher
   2 (C/OPN relay) or A1-6 (IG2) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   11