Inspection Procedure

INSPECT ECM (+B VOLTAGE)

Turn the ignition switch ON.

Measure the voltage of the ECM connectors.

Standard:

ECM CONNECTORS VOLTAGE SPECIFICATIONS

Tester Connection	Specified Condition
E5-1 (+B) -E9-1 (E1)	9 to 14 V

Fig 1: Identifying ECM Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )
NG: Go to next step

CHECK WIRE HARNESS (ECM - BODY GROUND)

Disconnect the E9 ECM connector.

Check the resistance of the wire harness side connectors.

Fig 2: Identifying E9 ECM Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

E9 ECM CONNECTOR RESISTANCE SPECIFICATIONS

Tester Connection	Specified Condition
E9-1 (E1) - Body ground	Below 1fl

NG: REPAIR 61° REPLACE HARNESS AND CONNECTOR
OK: Go to next step

INSPECT ECM (IGSW VOLTAGE)

Turn the ignition switch ON.

Check the voltage of the ECM connectors.

Fig 3: Identifying ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

ECM CONNECTORS VOLTAGE SPECIFICATIONS

Tester Connection	Specified Condition
E5-9 (IGSW) - E9-1 (E1)	9 to 14 V

OK: Go to step 6
NG: Go to next step

CHART FUSE (ING)
1. Remove the IGN fuse from the instrument panel J/B assy.
2. Check the resistance of the IGN fuse.
  Standard: Below 1Ω
  
  Fig 4: Identifying IGN Fuse
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE FUSE
2. OK: Go to next step

INSPECT IGNITION OR STARTER SWITCH ASSY

Check the resistance of the switch terminals shown in the chart below.

Fig 5: Identifying Ignition Or Starter Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

IGNITION OR STARTER SWITCH RESISTANCE SPECIFICATIONS

Switch Condition	Tester Connection	Specified Condition
LOCK	6 (IG2) - 7 (AM2)	10 kn or higher
START	6 (IG2) - 7 (AM2)	Below 1 a

NG: REPLACE IGNITION OR STARTER SWITCH ASSY
OK: CHECK AND REPAIR HARNESS AND CONNECTOR (BATTERY - IGNITION SWITCH, IGNITION SWITCH - ECM)

INSPECT ECM (MREL VOLTAGE)

Turn the ignition switch ON.

Measure the voltage of the ECM connectors.

Fig 6: Identifying ECM Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

ECM CONNECTORS VOLTAGE SPECIFICATIONS

Tester Connection	Specified Condition
E5-8 (MREL) - E9-1 (E1)	9 to 14 V

NG: REPLACE ECM (See ECM (3MZ-FE) )
OK: Go to next step

CHECK FUSE (EFI NO. 1)
1. Remove the EFI NO. 1 fuse from the engine room J/B.
2. Check the resistance of the EFI NO. 1 fuse.
  Standard: Below 1 Ω
1. NG: REPLACE FUSE
2. OK: Go to next step

INSPECT RELAY (EFI)

Remove the EFI relay from the engine room J/B.

Check the resistance of the EFI relay.

Fig 7: Inspecting Relay (EFI)

Standard:

EFI RELAY RESISTANCE SPECIFICATIONS

Tester Connection	Specified Condition
3-5	10 kfi 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 RELAY - ECM, EFI RELAY - BODY GROUND)

Check the wire harness between the EFI relay and ECM.

Remove the EFI relay from the engine room J/B.
Disconnect the E5 ECM connector.

Check the resistance of the wire harness side connectors.

Standard:

EFI RELAY AND ECM CONNECTOR RESISTANCE SPECIFICATIONS

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

Check the wire harness between the EFI relay and body ground.

Remove the EFI relay from the engine room J/B.
Check the resistance between the wire harness side connector and body around.

Fig 8: Identifying EFI Relay And ECM Connector Terminal

Standard:

EFI RELAY RESISTANCE SPECIFICATIONS

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

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