Inspection Procedure

CHECK ECM (+B VOLTAGE)

Turn the ignition switch ON.
Measure the voltage of the ECM connectors.

Fig 1: Identifying ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

ECM CONNECTOR - VOLTAGE TABLE

Tester Connection	Specified Condition
E3-6 (+B) - E6-7 (E1)	9 to 14 V

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

NG: Go to next step

CHECK WIRE HARNESS (ECM - BODY GROUND)

Disconnect the E6 ECM connector.
Measure the resistance of the wire harness side connector.

Fig 2: Disconnecting E6 ECM Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

ECM - BODY GROUND - RESISTANCE TABLE

Tester Connection	Specified Condition
E6-7 (E1) - Body ground	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: Go to next step

CHECK ECM (IGSW VOLTAGE)

Turn the ignition switch ON.
Measure the voltage of the ECM connectors.

Fig 3: Identifying ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

ECM CONNECTOR - VOLTAGE TABLE

Tester Connection	Specified Condition
E3-17 (IGSW) - E6-7 (E1)	9 to 14 V

OK: Go to step 6

NG: Go to next step

INSPECT FUSE (IGN)
1. Remove the IGN fuse from the engine room No. 1 R/B.
2. Measure the resistance of the IGN fuse.
Standard: Below 1 Ω

Fig 4: Identifying IGN Fuse
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE FUSE

OK: Go to next step

INSPECT IGNITION SWITCH

Measure the resistance of the switch.

Fig 5: Identifying Ignition Switch Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

IGNITION SWITCH - RESISTANCE TABLE

Switch Condition	Tester Connection	Specified Condition
LOCK	5 (AM2) - 6 (IG2)	10 kΩ or higher
ON	5 (AM2) - 6 (IG2)	Below 1 Ω

NG: REPAIR OR REPLACE IGNITION SWITCH

OK: CHECK AND REPAIR HARNESS AND CONNECTOR (BATTERY - IGNITION SWITCH, IGNITION SWITCH - ECM)

CHECK ECM (MREL VOLTAGE)

Turn the ignition switch ON.
Measure the voltage of the ECM connectors.

Fig 6: Identifying ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

ECM CONNECTOR - VOLTAGE TABLE

Tester Connection	Specified Condition
E3-13 (MREL) - E6-7 (E1)	9 to 14 V

NG: REPLACE ECM (See REPLACEMENT )

OK: Go to next step

CHECK FUSE (EFI NO. 1)
1. Remove the EFI NO. 1 fuse from the engine room No. 1 R/B.
2. Measure the resistance of the EFI NO. 1 fuse.
Standard: Below 1 Ω

Fig 7: Identifying EFI No. 1 Fuse
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE FUSE

OK: Go to next step

INSPECT RELAY (Marking: EFI MAIN)

Remove the EFI MAIN relay from the engine room No. 1 R/B.
Measure the resistance of the EFI MAIN relay.

Fig 8: Inspecting EFI MAIN Relay

Standard:

EFI MAIN RELAY - RESISTANCE TABLE

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)

NG: REPLACE RELAY

OK: Go to next step

CHECK WIRE HARNESS (EFI MAIN RELAY - ECM, EFI MAIN RELAY - BODY GROUND)

Check the wire harness between the EFI MAIN relay and ECM.

Remove the EFI MAIN relay from the engine room No. 1 R/B.
Disconnect the E3 ECM connector.
Measure the resistance of the wire harness side connectors.

Fig 9: Disconnecting E3 ECM Connector

Standard:

EFI MAIN RELAY - ECM - RESISTANCE TABLE

Tester Connection	Specified Condition
R/B EFI MAIN relay terminal 1 - E3-13 (MREL)	Below 1 Ω
R/B EFI MAIN relay terminal 1 or E3-13 (MREL) - Body ground	10 kΩ or higher

Check the wire harness between the EFI MAIN relay and body ground.
1. Remove the EFI MAIN relay from the engine room No. 1 R/B.
2. Measure the resistance of the wire harness side connector.

Standard:

EFI MAIN RELAY - BODY GROUND - RESISTANCE TABLE

Tester Connection	Specified Condition
R/B EFI MAIN relay terminal 2 - Body ground	Below 1 Ω

NG: CHECK AND REPAIR HARNESS AND CONNECTOR (TERMINAL +B OF ECM - BATTERY POSITIVE TERMINAL)

OK: REPAIR OR REPLACE HARNESS AND CONNECTOR