Inspection Procedure

1. Connect Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn the tester on.
3. Select the following menu items: Powertrain / Engine / Active Test / Control the Fuel Pump / Speed.
4. Check whether the fuel pump operation sound occurs when performing the Active Test on the tester.

   OK: 

   Fuel pump operating sound occurs. 

NG: Go to step 2 

OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE  (See PROBLEM SYMPTOMS TABLE )

NG: REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT 

OK: Go to next step 

1. Remove the integration relay from the engine room relay block.
2. Inspect the C/OPN relay.
   1. Measure the C/OPN relay resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      1D-5 - 1D-3	10 kΩ or higher
      	Below 1 Ω (Battery voltage applied between terminals 1G-5 and 1H-9)

3. Reinstall the integration relay.

NG: REPLACE ENGINE ROOM JUNCTION BLOCK 

Fig 1: Identifying Integration Relay Terminal From Engine Room Relay Block

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

1. Disconnect the ECM connectors.
2. Measure the voltage between the terminals of the ECM connectors.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   A55-7 (FC) - B50-81 (E1)	9 to 14 V

3. Reconnect the ECM connectors.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BATTERY) 

Fig 2: Identifying ECM Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

NG: REPLACE FUEL PUMP  (See FUEL PUMP )

OK: Go to next step 

1. Check the harness and the connectors between the engine room relay block and the fuel pump.
   1. Disconnect the integration relay connector.
   2. Disconnect the fuel pump connector.
   3. Measure the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connections	Specified Conditions
      1D-3 - K7-4 (Fuel pump)	Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connections	Specified Conditions
      1D-3 or K7-4 (Fuel pump) - Body ground	10 kΩ or higher

2. Check the harness and the connectors between the fuel pump and body ground.
   1. Disconnect the fuel pump connector.
   2. Measure the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      K7-5 (Fuel pump) - Body ground	Below 1 Ω

3. Reconnect the integration relay connector.
4. Reconnect the fuel pump connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 3: Identifying Fuel Pump Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : REPLACE ECM  (See ECM  )