Fuel Pump Control Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition 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 operating sound occurs when performing the Active Test on the Techstream.
   RESULT
   
   

   Result	Proceed to
   Fuel pump operating sound does not occur	A
   Fuel pump operating sound occurs	B

B → See step   8 

A: Go to next step 

1. Measure the voltage between the terminal of the main body ECU and the body ground when the ignition switch is turned to ON and off.
   Fig 1: Identifying Main Body ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   4B-11 (Main body ECU) - Body ground	Ignition switch off	Below 1 V
   4F-4 (Main body ECU) - Body ground
   4B-11 (Main body ECU) - Body ground	Ignition switch ON	11 to 14 V
   4F-4 (Main body ECU) - Body ground

   RESULT
   
   

   Result	Proceed to
   Outside standard range	A
   Within standard range	B

B → See step   4 

A: Go to next step 

1. Remove the integration relay from the engine room relay block.
   Fig 2: Identifying Main Body ECU And Integration Relay Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the main body ECU connectors.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   1B-4 (Integration relay) - 4F-4 (Main body ECU)	Always	Below 1 Ω
   1A-4 (Integration relay) - 4B-11 (Main body ECU)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   4F-4 (Main body ECU) - Body ground	Always	10 kΩ or higher
   4B-11 (Main body ECU) - Body ground	Always	10 kΩ or higher

4. Reinstall the integration relay.
5. Reconnect the main body ECU connectors.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   10 

1. Remove the main body ECU.
   Fig 3: Identifying Main Body ECU Connector Terminals

   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
   4A-8 - 4B-11	Battery voltage not applied	10 kΩ or higher
   	Battery voltage applied to terminals 4D-1 and 4E-5	Below 1 Ω

3. Reinstall the main body ECU.

NG → See step   11 

OK: Go to next step 

1. Disconnect the ECM connector.
   Fig 4: Identifying Main Body ECU And ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the main body 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
   4E-5 (Main body ECU) - A21-7 (FC)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   4E-5 (Main body ECU) or A21-7 (FC) - Body ground	Always	10 kΩ or higher

4. Reconnect the main body ECU connector.
5. Reconnect the ECM connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Check the harness and the connectors between the main body ECU (C/OPN relay) and the fuel pump.
   Fig 5: Identifying Fuel Pump Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Disconnect the main body ECU connector.
   2. Disconnect the fuel pump connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection	Condition	Specified Condition
      4A-8 (Main body ECU) - L7-4 (Fuel pump)	Always	Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection	Condition	Specified Condition
      4A-8 (Main body ECU) or L7-4 (Fuel pump) - Body ground	Always	10 kΩ or higher

   4. Reconnect the main body ECU connector.
   5. Reconnect the fuel pump connector.
2. Check the harness and the connectors between the fuel pump and the body ground.
   1. Disconnect the fuel pump connector.
   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection	Condition	Specified Condition
      L7-5 (Fuel pump) - Body ground	Always	Below 1 Ω

3. Reconnect the fuel pump connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the fuel pump.
2. Inspect fuel pump resistance.
   Fig 6: Identifying Fuel Pump Connector Terminals

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

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      4 (+) - 5 (-)	20°C (68°F)	0.2 to 3.0 Ω

3. Inspect fuel pump operation.
   1. Apply the battery voltage to both the terminals. Check that the pump operates.
      NOTE:

      • These tests must be done quickly (within 10 seconds) to prevent the coil from burning out.
      • Keep the fuel pump as far away from the battery as possible.
      • Always turn the voltage on and off on the battery side, not the fuel pump side.

      OK

      The fuel pump operates normally.

4. Reinstall the fuel pump.

NG → See step   16 

OK → See step   12 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Data List / Starter Signal.
5. Check the result when the ignition switch is turned to ON and START.

   OK

   Ignition Switch Position	Starter Signal
   ON	OFF
   START	ON

NG → See step   13 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Data List / Engine Speed.
5. Read the values displayed on the Techstream while cranking.

   OK

   Values are displayed continuously.

NG → See step   14 

OK → See step   15