Inspection Procedure

HINT:

Read freeze frame data using the intelligent tester or the OBD II scan tool. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

CHECK FUSE (ETCS)
1. Remove the ETCS fuse from the engine room J/B.
2. Measure the resistance of the ETCS fuse.
  Resistance: Below 1 ohms
  
  Fig 1: Checking Fuse (ETCS)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE FUSE

OK: GO TO NEXT STEP

INSPECT ECM (+BM VOLTAGE)

Measure the voltage of the ECM connectors.

Voltage

ECM (+BM VOLTAGE)

Tester connection	Specified Condition
E5-6 (+BM) - E6-1 (E1)	9 to 14 V

Fig 2: Inspecting ECM (+BM Voltage)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE ECM

NG: GO TO NEXT STEP

CHECK WIRE HARNESS (ECM - ETCS FUSE, ETCS FUSE - BATTERY)

Check the wire harness between the ETCS fuse and ECM.

Remove the ETCS fuse from the engine room J/B.
Disconnect the E5 ECM connector.
Measure the resistance of the wire harness side connectors.

Resistance

ETCS FUSE AND ECM

Tester connection	Specified Condition
J/B ETCS fuse terminal 2 - E5-6 (+BM)	Below 1 ohms
J/B ETCS fuse terminal 2 or E5-6 (+BM) - Body ground	10 k ohms or higher

Check the wire harness between the ETCS fuse and battery.

Remove the ETCS fuse from the engine room J/B.
Disconnect the battery's positive cable.

Measure the resistance of the wire harness side connectors.

Resistance

ETCS FUSE AND BATTERY

Tester connection	Specified Condition
Battery positive cable - J/B ETCS fuse terminal 1	Below 1 ohms
Battery positive cable or J/B ETCS fuse terminal 1 - Body ground	10 k ohms or higher

Fig 3: Checking Wire Harness (ECM - ETCS Fuse, ETCS Fuse - Battery)

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: REPLACE ENGINE ROOM JUNCTION BLOCK