Inspection Procedure

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

Standard voltage 

Fig 1: Inspecting ECM (+B Voltage)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

NG : Go to next step 

1. Disconnect the E7 ECM connector.
2. Measure the resistance of the wire harness side connectors.

Standard resistance 

Fig 2: Checking Harness And Connector (ECM - Body Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK : Go to next step 

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

Standard voltage 

Fig 3: Inspecting ECM (IGSW Voltage)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : GO TO STEP   6 

NG : Go to next step 

1. Remove the IGN fuse from the instrument panel J/B.
2. Measure the resistance of the IGN fuse.

Standard resistance: Below 1 Ω 

Fig 4: Identifying IGN Fuse

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPLACE IGN FUSE 

OK : Go to next step 

1. Measure the resistance of the switch terminals shown in the chart below.

Standard resistance 

Fig 5: Inspecting Ignition Or Starter Switch Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPLACE IGNITION OR STARTER SWITCH ASSEMBLY 

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

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

Standard voltage 

Fig 6: Inspecting ECM (MREL Voltage)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPLACE ECM 

OK : Go to next step 

1. Remove the EFI No. 1 fuse from the fusible link block.
2. Measure the resistance of the EFI No. 1 fuse.

   Standard resistance: Below 1 Ω 

3. Install the EFI NO. 1 fuse.
Fig 7: Checking EFI No. 1 Fuse
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPLACE EFI NO. 1 FUSE 

OK : Go to next step 

1. Remove the EFI MAIN relay from the engine room R/B.
2. Measure the resistance of the EFI MAIN relay.

Standard resistance 

Fig 8: Identifying Relay Test Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPLACE EFI MAIN RELAY 

OK : Go to next step 

1. Check the wire harness between the EFI MAIN relay and ECM.
   1. Remove the EFI MAIN relay from the engine room R/B.
   2. Disconnect the E5 ECM connector.
   3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   EFI MAIN RELAY- ECM
   
   

   Tester Connection	Specified Condition
   R/B EFI MAIN relay terminal 1 - E5-8 (MREL)	Below 1 Ω
   R/B EFI MAIN relay terminal 1 or E5-8 (MREL) - Body ground	10 kΩ or higher

2. Check the wire harness between the EFI MAIN relay and body ground.
   1. Remove the EFI MAIN relay from the engine room R/B.
   2. Measure the resistance between the wire harness side connector.

Standard resistance 

Fig 9: Checking Harness And Connector (EFI Main Relay - ECM, EFI Main Relay - Body Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

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