Inspection Procedure

Hand-held tester: 

1. Check fuel pump operation (See  FUEL PUMP  ). 
   1. OK : Go to step   8 . 
   2. NG : Go to Next Step. 
2. Connect hand-held tester, and check operation of fuel pump relay. 

   PREPARATION: 

   1. Connect the hand-held tester to the DLC3.
   2. Turn the ignition switch ON and push the hand-held tester main switch ON.
   3. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FUEL PUMP / SPD.

   CHECK: 

   Check the operation of the fuel pump relay when it is switched ON and OFF by the hand-held tester.

   OK: 

   1. Operating noise can be heard from the relay. 
   1. OK : Go to step   4 . 
   2. NG : Go to Next Step. 
3. Check operation of fuel pump relay (See  FUEL PUMP RELAY  ). 
   1. NG : Replace fuel pump relay. 
   2. OK : Go to Next Step. 
4. Check fuel pump (See  FUEL PUMP  ). 
   1. NG : Repair or replace fuel pump. 
   2. OK : Go to Next Step. 
5. Check circuit opening relay (See  CIRCUIT OPENING RELAY  ). 
   1. NG : Replace circuit opening relay. 
   2. OK : Go to Next Step. 
6. Check for open in harness and connector between EFI or ECD relay and fuel pump, and fuel pump and body ground (See  PROCEDURE  ). 
   1. NG : Repair or replace harness or connector. 
   2. OK : Go to Next Step. 
7. Check voltage between terminal FC and E1 of ECM connector. 

   PREPARATION: 

   Turn the ignition switch ON.

   CHECK: 

   Measure the voltage between terminal FC of the ECM connector and body ground.

   OK: 

   1. Voltage: 9 to 14 V 
   Fig 1: Identifying Terminal FC And E1 Of ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG : Check for open in harness and connector between battery and FC terminal of ECM (See  PROCEDURE  ). 
   2. OK : Proceed to problem symptoms table (See  PROBLEM SYMPTOMS TABLE   ). 
8. Check fuel pump resistor (See  INSPECTION  ). 
   1. NG : Replace fuel pump resistor. 
   2. OK : Check for open in harness and connector between circuit opening relay and fuel pump resistor, and fuel pump resistor and fuel pump (See  PROCEDURE  ). 

OBD II scan tool (excluding hand-held tester): 

1. Check operation of fuel pump (See  FUEL PUMP  ). 
   1. OK : Go to step   7 . 
   2. NG : Go to Next Step. 
2. Check operation of fuel pump relay (See  FUEL PUMP RELAY  ). 
   1. NG : Replace fuel pump relay. 
   2. OK : Go to Next Step. 
3. Check fuel pump (See  FUEL PUMP  ). 
   1. NG : Repair or replace fuel pump. 
   2. OK : Go to Next Step. 
4. Check circuit opening relay (See  CIRCUIT OPENING RELAY  ). 
   1. NG : Replace circuit opening relay. 
   2. OK : Go to Next Step. 
5. Check for open in harness and connector between EFI or ECD relay and fuel pump, and fuel pump and body ground (See  PROCEDURE  ). 
   1. NG : Repair or replace harness or connector. 
   2. OK : Go to Next Step. 
6. Check voltage between terminal FC of ECM connector and body ground. 

   PREPARATION: 

   Turn the ignition switch ON.

   CHECK: 

   Measure the voltage between terminal FC of the ECM connector and body ground.

   OK: 

   1. Voltage: 9 to 14 V 
   Fig 2: Identifying Terminal FC Of ECM Connector And Body Ground

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG : Check for open in harness and connector between battery and FC terminal of ECM (See  PROCEDURE  ). 
   2. OK : Proceed to problem symptoms table (See  PROBLEM SYMPTOMS TABLE   ). 
7. Check fuel pump resistor (See  INSPECTION  ). 
   1. NG : Replace fuel pump resistor. 
   2. OK : Check for open in harness and connector between circuit opening relay and fuel pump resistor, fuel pump resistor and fuel pump (See  PROCEDURE  ).