Inspection Procedure

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

Standard voltage 

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

Fig 1: Checking ECM (+B, +B1 Voltage)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to next step 

1. Disconnect the E3 ECM connector.
2. Measure the resistance of the wire harness side connector.

Standard resistance 

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

Fig 2: Checking Wire Harness (ECM - Body Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

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

Standard voltage 

OK:  Go to step  8

Fig 3: Checking ECM (IGSW Voltage)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to next step 

1. Remove the IGN fuse from the engine room No. 2 relay block.
2. Measure the resistance of the IGN fuse.

Standard resistance: 

Below 1 Ω 

NG: CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

Fig 4: Identifying IGN Fuse

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

1. Remove the IG2 relay from the engine room No. 1 relay block.
2. Measure the resistance of the IG2 relay.

Standard resistance 

NG: REPLACE IG2 RELAY 

Fig 5: IG2 Relay Circuit Diagram

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OK: Go to next step 

1. Disconnect the I18 ignition switch connector.
2. Measure the resistance of the ignition switch.

Standard resistance 

NG: REPAIR OR REPLACE IGNITION SWITCH 

Fig 6: Identifying Ignition Switch Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

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

Standard voltage 

NG: REPLACE ECM 

Fig 7: Checking ECM (MREL Voltage)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

1. Remove the EFI fuse from the engine room No. 1 relay block and junction block.
2. Measure the resistance of the EFI fuse.

Standard resistance: 

Below 1 Ω 

NG: REPLACE EFI RELAY 

Fig 8: Identifying EFI Fuse

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OK: Go to next step 

1. Remove the EFI relay from the engine room No. 2 relay block.
2. Measure the resistance of the EFI relay.

Standard resistance 

Fig 9: EFI Relay Circuit Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: Go to next step 

1. Check the wire harness between the EFI relay and ECM.
   1. Remove the EFI relay from the engine room No. 2 relay block.
   2. Disconnect the E6 ECM connector.
   3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   Relay block EFI relay terminal 2 - E6-13 (MREL)	Below 1 Ω
   Relay block EFI relay terminal 2 or E6-13 (MREL) - Body ground	10 kΩ or higher

2. Check the wire harness between the EFI relay and body ground.
   1. Remove the EFI relay from the engine room No. 2 relay block.
   2. Measure the resistance of the wire harness side connectors.
   Fig 10: Checking Wire Harness (EFI Relay - ECM And Body Ground)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   Relay block EFI relay terminal 1 - Body ground	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: REPAIR OR REPLACE HARNESS AND CONNECTOR (TERMINAL +B OF ECM - POSITIVE (+) BATTERY TERMINAL)