Inspection Procedure

HINT:

Head freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. 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, as well as other data from the time when a malfunction occurred.

Check ETCS fuse.
PREPARATION:

Remove the ETCS fuse from the engine room J/B.

CHECK:

Check the continuity of the ETCS fuse.

Fig 1: Checking ETCS Fuse
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:
1. Continuity
1. NG: Check for short in all harness and components connected to ETCS fuse.
2. OK: Go to Next Step
Check voltage between terminal +BM and E1 of ECM connector.
CHECK:

Measure the voltage between the specified terminals of the E6 and E9 ECM connector.

Fig 2: Checking Voltage Between Terminal +BM And E1 Of ECM Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:

Fig 3: Voltage Reference Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: Check for intermittent problems (See PRE-CHECK ).
2. NG: Go to Next Step
Check for open or short in harness or connector between battery and ETCS fuse, ETCS fuse and ECM.
Check the harness and the connector between the ETCS fuse and the ECM:

PREPARATION:
1. Remove the ETCS fuse from the engine room J/B.
2. Disconnect the E9 ECM connector.
CHECK:

Measure the resistance between the wire harness side connector.

OK:

Fig 6: Resistance Reference Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the harness and connector between the ETCS fuse and the battery:

PREPARATION:
1. Remove the ETCS fuse from the engine room J/B.
2. Disconnect the battery positive terminal.
CHECK:

Measure the resistance between the wire harness side connector.

OK:

Fig 7: Resistance Reference Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Repair or replace harness or connector.
2. OK: Check engine room J/B.