Inspection Procedure

Hand-held tester: 

1. Connect the hand-held tester and check operation of fuel pump (See  PRE-CHECK   ). 

   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 if operating sounds can be heard while operating the relay with the hand-held tester.

   OK: 

   Operating sounds can be heard from the relay. 

   1. OK: Go to step   5 . 
   2. NG: Go to next step. 
2. Check circuit opening relay (Marking: C/OPN) (See  CIRCUIT OPENING RELAY  ). 
   1. NG: Replace circuit opening relay. 
   2. OK: Go to next step. 
3. Check voltage between terminal FC of ECM and body ground. 

   PREPARATION: 

   1. Remove the ECM cover.
   2. Turn the ignition switch ON.

   CHECK: 

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

   OK: 

   Voltage 9 to 14 V 

   Fig 1: Identifying Terminal FC Of ECM

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. OK: Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 
   2. NG: Go to next step. 
4. Check for open and short in harness and connector between circuit opening relay (Marking: C/OPN) and ECM, circuit opening relay (Marking: C/OPN) and ignition switch (See  HOW TO USE THE DIAGNOSTIC TABLE AND INSPECTION PROCEDURE  ). 
   1. NG: Repair or replace harness or connector. 
   2. OK: Go to next step. 
5. Check fuel pump (See  ON-VEHICLE INSPECTION  ). 
   1. NG: Repair or replace fuel pump. 
   2. OK: Go to next step. 
6. Check for open in harness and connector between circuit opening relay (Marking: C/OPN) and fuel pump, fuel pump and body ground (See  HOW TO USE THE DIAGNOSTIC TABLE AND INSPECTION PROCEDURE  ). 
   1. NG: Repair or replace harness or connector. 
   2. OK: Go to next step. 

      Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 

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

1. Check operation of fuel pump. 

   PREPARATION: 

   1. Remove the ECM cover.
   2. Turn the ignition switch ON.

   CHECK: 

   1. Connect between terminal FC of the ECM connector and body ground.
   2. Check for fuel pressure in the fuel inlet hose when it is pinched off.

   OK: 

   There is pressure in fuel inlet hose. 

   HINT:

   Fig 2: Checking Fuel Inlet Hose

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   At this time, you will hear a fuel return flowing noise.

   1. OK: Proceed to next circuit inspection shown on  PROBLEM SYMPTOMS TABLE   . 
   2. NG: Go to next step. 
2. Check operation of circuit opening relay (Marking: C/OPN). 

   CHECK: 

   When connecting between terminal FC of the ECM connector and the body ground, check the relay operation.

   OK: 

   Noise can be heard from the circuit opening relay. 

   Fig 3: Identifying Terminal FC Of ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. OK: Go to step   6 . 
   2. NG: Go to next step. 
3. Check circuit opening relay (Marking: C/OPN) (See  CIRCUIT OPENING RELAY  ). 
   1. NG: Replace circuit opening relay. 
   2. OK: Go to next step. 
4. Check voltage between terminal FC of ECM and body ground. 

   PREPARATION: 

   1. Remove the ECM cover.
   2. Turn the ignition switch ON.

   CHECK: 

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

   OK: 

   Voltage 9 to 14 V 

   Fig 4: Identifying Terminal FC Of ECM

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. OK: Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 
   2. NG: Go to next step. 
5. Check for open and short in harness and connector between circuit opening relay (Marking: C/OPN) and ECM, circuit opening relay (Marking: C/OPN) and ignition switch (See  HOW TO USE THE DIAGNOSTIC TABLE AND INSPECTION PROCEDURE  ). 
   1. NG: Repair or replace harness or connector. 
   2. OK: Go to next step. 

      Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 

6. Check fuel pump (See  ON-VEHICLE INSPECTION  ). 
   1. NG: Repair or replace fuel pump. 
   2. OK: Go to next step. 
7. Check for open in harness and connector between circuit opening relay (Marking: C/OPN) and fuel pump, fuel pump and body ground (See  HOW TO USE THE DIAGNOSTIC TABLE AND INSPECTION PROCEDURE  ). 
   1. NG: Repair or replace harness or connector. 
   2. OK: Go to next step. 

      Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ).