Inspection Procedure

INSPECT FUEL INJECTOR (POWER SOURCE)

Disconnect the fuel injector connectors.
Turn the ignition switch to ON.

Measure the voltage according to the value(s) in the table below.

Standard voltage

VOLTAGE SPECIFICATION

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

Reconnect the fuel injector connectors.

NG: Go to step 6

Fig 1: Identifying Fuel Injector Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

INSPECT FUEL INJECTOR (INJECTOR RESISTANCE)

Disconnect the fuel injector connectors.

Measure the resistance according to the value(s) in the table below.

Standard resistance

RESISTANCE SPECIFICATION

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

Reconnect the fuel injector connectors.

NG: REPLACE FUEL INJECTOR (See REMOVAL )

Fig 2: Identifying Fuel Injector Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

CHECK HARNESS AND CONNECTOR (FUEL INJECTOR - ECM)

Disconnect the ECM connector.
Disconnect the fuel injector connectors.

Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open)

RESISTANCE SPECIFICATION

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)

RESISTANCE SPECIFICATION

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

Reconnect the fuel injector connectors.
Reconnect the ECM connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 3: Identifying Fuel Injector And ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open)

RESISTANCE SPECIFICATION

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

Reconnect the ECM connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 4: Identifying ECM Connector Terminals

OK: Go to next step

INSPECT FUEL INJECTOR (INJECTION AND VOLUME)
1. Check the fuel injector injection and volume (See INSPECTION ).
NG: REPLACE FUEL INJECTOR (See REMOVAL )

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

CHECK HARNESS AND CONNECTOR (FUEL INJECTOR - INTEGRATION RELAY)

Disconnect the fuel injector connectors.
Remove the integration relay from the engine room relay block.

Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open)

RESISTANCE SPECIFICATION

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)

RESISTANCE SPECIFICATION

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 o 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

Reconnect the fuel injector connectors.
Reinstall the integration relay.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 5: Identifying Fuel Injector Connector Terminals

OK : REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT (See ECM POWER SOURCE CIRCUIT )