Fuel Pump Control Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition to switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed.
5. Check whether the fuel pump operation sound occurs when performing the Active Test on the Techstream.

   OK

   Fuel pump operating sound occurs.

NG → See step   2 

OK → See step   10 

1. Remove the IGN fuse from the driver side junction block.
   Fig 1: Identifying IGN Fuse

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   IGN fuse	Always	Below 1 Ω

3. Reinstall the IGN fuse.

NG → CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

OK: Go to next step 

1. Disconnect the driver side junction block connector.
   Fig 2: Inspecting Driver Side Junction Block

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2A-8 - 2B-11	Always	10 kΩ or higher
   	Apply battery voltage to terminals 2B-10 and 2B-9	Below 1 Ω

3. Reconnect the driver side junction block connector.

NG → REPLACE DRIVER SIDE JUNCTION BLOCK (C/OPN RELAY) 

OK: Go to next step 

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

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   2B-10 - A37-19 (FC)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   2B-10 or A37-19 (FC) - Body ground	Always	10 kΩ or higher

4. Reconnect the ECM connector.
5. Reconnect the driver side junction block connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (C/OPN RELAY - ECM) 

OK: Go to next step 

1. Remove the integration relay from engine room junction block.
2. Disconnect the integration relay connector.
3. Disconnect the driver side junction block connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   2B-11 - 1B-4	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   2B-11 or 1B-4 - Body ground	Always	10 kΩ or higher

5. Reconnect the driver side junction block connector.
6. Reconnect the integration relay connector.
7. Reinstall the integration relay.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (C/OPN RELAY - INTEGRATION RELAY (EFI MAIN RELAY)) 

OK: Go to next step 

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

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   2A-8 - L13-4	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   2A-8 or L13-4 - Body ground	Always	10 kΩ or higher

4. Reconnect the fuel pump connector.
5. Reconnect the driver side junction block connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (C/OPN RELAY - FUEL PUMP) 

OK: Go to next step 

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L13-5 - Body ground	Always	Below 1 Ω

3. Reconnect the fuel pump connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL PUMP - BODY GROUND) 

OK: Go to next step 

1. Inspect the fuel pump assembly. Refer to INSPECTION .

NG → See step   11 

OK: Go to next step 

1. Check the ECM power source circuit. Refer to ECM Power Source Circuit .

NG → REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT 

OK → See step   12