Inspection Procedure

Check voltage between terminals ECUB and ECUE of ECU connector.
PREPARATION:

Remove ECU with connectors still connected.

CHECK:

Measure voltage between terminals ECUB and ECUE of ECU connector.

Fig 1: Checking Voltage Between Terminals ECUB And ECUE Of ECU Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:

Voltage: 10-16 V
1. OK: Proceed to next circuit inspection shown on the problem symptom table (See PROBLEM SYMPTOMS TABLE ).
2. NG: Go to Next Step
Check continuity between terminal ECUE of ECU connector and body ground.
CHECK:

Measure resistance between terminal ECUE of ECU connector and body ground.

OK:

Resistance: 1 KΩ or less

Fig 2: Checking Continuity Between Terminal ECUE Of ECU Connector And Body Ground
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Repair or replace harness or connector.
2. OK: Go to Next Step
Check MPX-B fuse.
PREPARATION:

Remove MPX-B fuse from engine room R/B.

CHECK:

Check continuity of MPX-B fuse.

OK:

Continuity
1. NG: Check for short circuit in harness and all components connected to MPX-B fuse (See attached WIRING DIAGRAM ).
2. OK: Check for open circuit in harness and connector between ECU and battery (See O/D DIRECT CLUTCH SPEED SENSOR ).