Inspection Procedure

Hand-held tester: 

1. Connect hand-held tester and check operation of fuel pump. 

   PREPARATION: 

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

   CHECK: 

   Check that operating noise is heard from the relay while operating it using the hand-held tester.

   OK: 

   Operating noise 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). 

   PREPARATION: 

   Remove the circuit opening relay from the engine room J/B.

   CHECK: 

   Measure the circuit opening relay.

   OK: 

   CIRCUIT OPENING RELAY TERMINALS RESISTANCE
   
   

   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)

   Fig 1: Identifying Relay Terminals (Marking: C/OPN)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG: Replace circuit opening relay. 
   2. OK: Go To Next Step 
3. Check voltage between terminal FC of ECM connector and body ground. 

   PREPARATION: 

   1. Remove the glove compartment (see ENGINE CONTROL MODULE (ECM) ).
   2. Turn the ignition switch ON.

   CHECK: 

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

   OK: 

   Voltage: 9 to 14 V 

   Fig 2: Identifying Terminal FC Of ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. OK: Go to step   5 . 
   2. NG: Go To Next Step 
4. Check for open in wire harness between EFI main relay and circuit opening relay (Marking: C/OPN), and circuit opening relay and ECM (see  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
   1. NG: Repair or replace harness and connector. 
   2. OK: Replace ECM (see  ENGINE CONTROL MODULE (ECM)  ). 
5. Check fuel pump (see  FUEL PUMP  ). 
   1. NG: Repair or replace fuel pump. 
   2. OK: Go To Next Step 
6. Check for open in wire harness between circuit opening relay (Marking: C/OPN) and fuel pump, and fuel pump and body ground (see  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
   1. NG: Repair or replace harness and connector. 
   2. OK: Replace ECM (see  ENGINE CONTROL MODULE (ECM)  ). 

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

1. Check fuel pump operation (see  FUEL PUMP  ). 

   CHECK: 

   Check if there is pressure in the fuel inlet hose.

   HINT:

   The pipe has fuel pressure if the sound of flowing fuel can be heard.

   1. NG: Proceed to next circuit inspection shown on problem symptoms table (see  PROBLEM SYMPTOMS TABLE  ). 
   2. OK: Go To Next Step 
2. Check operation circuit opening relay (Marking: C/OPN). 

   PREPARATION: 

   Connect between terminal FC of the ECM connector and the body ground.

   CHECK: 

   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. NG: Go to step   6 . 
   2. OK: Go To Next Step 
3. Check circuit opening relay (Marking: C/OPN). 

   PREPARATION: 

   Remove the circuit opening relay from the engine room J/B.

   CHECK: 

   Measure the circuit opening relay.

   OK: 

   CIRCUIT OPENING RELAY TERMINALS RESISTANCE
   
   

   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)

   Fig 4: Identifying Relay Terminals (Marking: C/OPN)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG: Replace circuit opening relay. 
   2. OK: Go To Next Step 
4. Check voltage between terminal FC of ECM connector and body ground. 

   PREPARATION: 

   1. Remove the glove compartment (see ENGINE CONTROL MODULE (ECM) ).
   2. Turn the ignition switch ON.

   CHECK: 

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

   OK: 

   Voltage: 9 to 14 V 

   Fig 5: Identifying Terminal FC Of ECM Connector

   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 in wire harness between circuit opening relay (Marking: C/OPN) and fuel pump, and fuel pump and body ground (see  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
   1. NG: Repair or replace harness and connector. 
   2. OK: Go To Next Step 
6. Check fuel pump (see  FUEL PUMP  ). 
   1. NG: Repair or replace fuel pump. 
   2. OK: Go To Next Step 
7. Check for open in wire harness between circuit opening relay (Marking: C/OPN) and fuel pump, and fuel pump and body ground (see  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
   1. NG: Repair or replace harness and connector. 
   2. OK: Replace ECM (see  ENGINE CONTROL MODULE (ECM)  ).