Inspection Procedure

CHECK ECM (+B VOLTAGE)

Turn the ignition switch ON.

Measure the voltage of the ECM connectors.

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Specified Condition
E10-1 (+B) - E6-1 (E1)	9 to 14 V

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

Fig 1: Identifying ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to next step

CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

Disconnect the E6 ECM connector.

Measure the resistance of the wire harness side connector.

Standard resistance

RESISTANCE SPECIFICATION

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 2: Disconnecting E6 ECM Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

CHECK ECM (IGSW VOLTAGE)

Turn the ignition switch ON.

Measure the voltage of the ECM connectors.

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Specified Condition
E10-9 (IGSW) - E6-1 (E1)	9 to 14 V

OK: Go to step 6

Fig 3: Identifying ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to next step

INSPECT FUSE (IGN)
1. Remove the IGN fuse from the cowl side junction block RH.
2. Measure the resistance of the IGN fuse.
  Standard resistance:
  
  Below 1 Ω
NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO IGN FUSE, AND REPLACE IGN FUSE

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

OK: Go to next step

INSPECT IGNITION SWITCH ASSEMBLY

Remove the I18 ignition switch connector.

Measure the resistance of the ignition switch.

Standard resistance

RESISTANCE SPECIFICATION

Switch position	Tester Connection	Specified Condition
ON	6-7	Below 1 Ω
START	6-7	Below 1 Ω

NG: REPLACE IGNITION SWITCH ASSEMBLY

Fig 5: Identifying Ignition Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGNITION SWITCH, IGNITION SWITCH - ECM)

CHECK ECM (MREL VOLTAGE)

Turn the ignition switch ON.

Measure the voltage of the ECM connectors.

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Specified Condition
E10-8 (MREL) - E6-1 (E1)	9 to 14 V

NG: REPLACE ECM

Fig 6: Identifying ECM Connector Terminals

OK: Go to next step

INSPECT FUSE (EFI OR ECD NO. 1)
1. Remove the EFI OR ECD NO. 1 fuse from the engine room junction block.
2. Measure the resistance of the EFI OR ECD NO. 1 fuse.
  Standard resistance:
  
  Below 1 Ω
NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO EFI OR ECD NO. 1 FUSE, AND REPLACE EFI OR ECD FUSE

Fig 7: Identifying EFI Or ECD NO 1 Fuse
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT EFI RELAY (Marking: EFI OR ECD)

Remove the EFI relay from the engine room relay block.

Measure the resistance of the EFI relay.

Standard resistance

RESISTANCE SPECIFICATION

Terminal Connection	Specified Condition
1 - 3	10 kΩ or higher
1 - 3	Below 1 Ω (when battery voltage is applied to terminals 2 and 4)

NG: REPLACE EFI RELAY

Fig 8: Inspecting EFI Relay

OK: Go to next step

CHECK HARNESS AND CONNECTOR (EFI RELAY - ECM, EFI RELAY - BODY GROUND)
1. Check harness and connector (see ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
OK: REPAIR OR REPLACE HARNESS OR CONNECTOR

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