Fuel Injector Circuit: Procedure

1. Disconnect the fuel injector connectors.
   Fig 1: Identifying Fuel Injector Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   C4-1 - Body ground	Ignition switch ON	11 to 14 V
   C5-1 - Body ground	Ignition switch ON	11 to 14 V
   C6-1 - Body ground	Ignition switch ON	11 to 14 V
   C7-1 - Body ground	Ignition switch ON	11 to 14 V

4. Reconnect the fuel injector connectors.

NG → See step   6 

OK: Go to next step 

Fig 2: Identifying Fuel Injector Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the fuel injector connectors.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1 - 2	20°C (68°F)	11.6 to 12.4 Ω

3. Reconnect the fuel injector connectors.

NG → See step   7 

OK: Go to next step 

1. Disconnect the ECM connector.
   Fig 3: Identifying Fuel Injector And ECM Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the fuel injector connectors.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   C4-2 - C19-108 (#10)	Always	Below 1 Ω
   C5-2 - C19-107 (#20)	Always	Below 1 Ω
   C6-2 - C19-106 (#30)	Always	Below 1 Ω
   C7-2 - C19-105 (#40)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   C4-2 or C19-108 (#10) - Body ground	Always	10 kΩ or higher
   C5-2 or C19-107 (#20) - Body ground	Always	10 kΩ or higher
   C6-2 or C19-106 (#30) - Body ground	Always	10 kΩ or higher
   C7-2 or C19-105 (#40) - Body ground	Always	10 kΩ or higher

4. Reconnect the fuel injector connectors.
5. Reconnect the ECM connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

Fig 4: Identifying ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the ECM connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   C19-45 (E01) - Body ground	Always	Below 1 Ω
   C19-44 (E02) - Body ground	Always	Below 1 Ω

3. Reconnect the ECM connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Check the fuel injector injection and volume. Refer to INSPECTION .

NG → See step   7 

OK → See step   9 

Fig 5: Identifying Fuel Injector Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the fuel injector connectors.
2. Remove the integration relay from the engine room relay block.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   C4-1 - 1B-4 (Integration relay)	Always	Below 1 Ω
   C5-1 - 1B-4 (Integration relay)	Always	Below 1 Ω
   C6-1 - 1B-4 (Integration relay)	Always	Below 1 Ω
   C7-1 - 1B-4 (Integration relay)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   C4-1 or 1B-4 (Integration relay) - Body ground	Always	10 kΩ or higher
   C5-1 or 1B-4 (Integration relay) - Body ground	Always	10 kΩ or higher
   C6-1 or 1B-4 (Integration relay) - Body ground	Always	10 kΩ or higher
   C7-1 or 1B-4 (Integration relay) - Body ground	Always	10 kΩ or higher

4. Reconnect the fuel injector connectors.
5. Reinstall the integration relay.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   8