Inspection Procedure

1. Check if there is pressure in the fuel inlet hose.

   HINT:

   If there is fuel pressure, you will hear the sound of fuel flowing.

OK:  GO TO step  10

NG: GO TO next step 

1. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
2. Turn the ignition switch ON and turn the intelligent tester ON.
3. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FUEL PUMP / SPD.
4. Check the relay operation when it is operated by the intelligent tester.

   Standard: 

   Operating sound can be heard from the relay. 

OK:  GO TO step  5

NG: GO TO next step 

1. Remove the circuit opening relay from the engine room relay block.
2. Measure the resistance of the circuit opening relay.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   3 - 5	10 kΩ or higher
   3 - 5	Below 1 Ω (when battery voltage Is applied to terminals 1 and 2)

3. Reinstall the circuit opening relay.
   Fig 1: Inspecting A/F Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE CIRCUIT OPENING RELAY 

OK: GO TO next step 

1. Turn the ignition switch ON.
2. Measure the voltage of the E4 and E6 ECM connectors.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   FC (E4-10) - E1 (E6-1)	9 to 14 V

OK: REPLACE ECM 

Fig 2: Identifying E6 And E4 ECM Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: CHECK AND REPAIR HARNESS OR CONNECTOR (ECM - CIRCUIT OPENING RELAY, CIRCUIT OPENING RELAY - IGNITION SWITCH) 

1. Check the ECM Power Source Circuit (see ECM POWER SOURCE CIRCUIT  ).

NG: REPAIR OR REPLACE 

OK: GO TO next step 

1. Remove the fuel pump relay from the engine room relay block.
2. Measure the resistance of the fuel pump relay.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   3 - 4	Below 1 Ω
   3 - 5	10 kΩ or higher
   3 - 4	10 kΩ or higher (when battery voltage is applied to terminals 1 and 2)
   3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

3. Reinstall the fuel pump relay.

NG: REPLACE FUEL PUMP RELAY 

Fig 3: Inspecting Fuel Pump Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: GO TO next step 

1. Check the fuel pump operation (See FUEL PUMP ).

NG: REPLACE FUEL PUMP 

OK: GO TO next step 

1. Check the harness and connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: GO TO next step 

1. Check the harness and connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: CHECK AND REPAIR HARNESS OR CONNECTOR (EFI RELAY - CIRCUIT OPENING RELAY) 

1. Remove the fuel pump relay from the engine room relay block.
2. Measure the resistance of the fuel pump relay.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   3 - 4	Below 1 Ω
   3 - 5	10 kΩ or higher
   3 - 4	10 kΩ or higher (when battery voltage is applied to terminals 1 and 2)
   3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

3. Reinstall the fuel pump relay.

NG: REPLACE FUEL PUMP RELAY 

Fig 4: Inspecting Fuel Pump Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: GO TO next step 

1. Inspect the fuel pump resistor resistance.
   1. Measure the resistance of the terminals.

      Resistance: 

      0.70 to 0.76 Ω at 20°C (68°F) 

NG: REPLACE FUEL PUMP RESISTOR 

Fig 5: Measuring Resistance Fuel Pump Resistor Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: GO TO next step 

1. Check the harness and connector.

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR