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 the fuel pump operating sound occurs when performing the Active Test on the Techstream.

   OK

   Fuel pump operating sound occurs.

NG → See step   4 

OK: Go to next step 

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 / Data List / Starter Signal.
4. Check the result when the ignition switch is turned to ON and START.

   OK

   Ignition Switch Position	Starter Signal
   ON	OFF
   START	ON

NG → REPAIR OR REPLACE STARTING SYSTEM 

OK: Go to next step 

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 / Data List / Engine Speed.
4. Read the values displayed on the Techstream while cranking the engine.

   OK

   Values are displayed continuously.

NG → REPAIR OR REPLACE CRANKSHAFT POSITION SENSOR CIRCUIT 

OK → See step   12 

1. Measure the voltage according to the value(s) in the table below.
   Fig 1: Identifying Instrument Panel Junction Block (C/OPN Relay Input Voltage)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   IB-11 - Body ground	Ignition switch off	Below 1 V
   IF-4 - Body ground
   IB-11 - Body ground	Ignition switch ON	11 to 14 V
   IF-4 - Body ground

NG → See step   9 

OK: Go to next step 

1. Remove the instrument panel junction block.
   Fig 2: Identifying Instrument Panel Junction Block (C/OPN Relay)

   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
   IB-11 - IA-8	Battery voltage not applied to terminals IF-4 and IE-5	10 kΩ or higher
   	Battery voltage applied to terminals IF-4 and IE-5	Below 1 Ω

3. Reinstall the instrument panel junction block.

NG → REPLACE MAIN BODY ECU 

OK: Go to next step 

1. Disconnect the ECM connector.
   Fig 3: Checking Harness And Connector (Main Body ECU - ECM)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the instrument panel 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
   IE-5 - A9-8 (FC)	Always	Below 1 Ω

   Standard Resistance (Check for short)

   Tester Connection	Condition	Specified Condition
   IE-5 or A9-8 (FC) - Body ground	Always	10 kΩ or higher

4. Reconnect the instrument panel junction block connector.
5. Reconnect the ECM connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Check the harness and connectors between the instrument panel junction block and fuel pump.
   Fig 4: Identifying Instrument Panel Junction Block And Fuel Pump Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Disconnect the instrument panel junction block 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
      IA-8 - Fuel pump (S1-4)	Always	Below 1 Ω

      Standard Resistance (Check for short)

      Tester Connection	Condition	Specified Condition
      IA-8 or Fuel pump (S1-4) - Body ground	Always	10 kΩ or higher

2. Check the harness and connectors between the fuel pump and 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
      Fuel pump (S1-5) - Body ground	Always	Below 1 Ω

3. Reconnect the instrument panel junction block connector.
4. Reconnect the fuel pump connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Inspect the fuel pump. Refer to INSPECTION .

NG → See step   11 

OK → See step   13 

NG → REPLACE INTEGRATION NO. 1 RELAY 

OK: Go to next step 

1. Remove the IG2 relay from the engine room No. 1 relay block.
2. Remove the integration relay from the engine room No. 1 relay block.
3. Disconnect the instrument panel junction block connectors.
4. Measure the resistance according to the value(s) in the table below.
   Fig 5: Checking Harness And Connector (Instrument Panel Junction Block - Engine Room No. 1 Relay Block, Integration Relay)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance (Check for open)

   Tester Connection	Condition	Specified Condition
   IG2 relay (5) - IF-4	Always	Below 1 Ω
   IB-11 - 1B-8	Always	Below 1 Ω
   1B-6 - 1A-4	Always	Below 1 Ω
   1B-7 - Body ground	Always	Below 1 Ω

   Standard Resistance (Check for short)

   Tester Connection	Condition	Specified Condition
   IG2 relay (5) or IF-4 - Body ground	Always	10 kΩ or higher
   IB-11 or 1B-8 - Body ground	Always	10 kΩ or higher
   1B-6 or 1A-4 - Body ground	Always	10 kΩ or higher

5. Reinstall the IG2 relay.
6. Reinstall the integration relay.
7. Reconnect the instrument panel junction block connectors.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   14