Inspection Procedure

WARNING: This page is about a different car, the 2006 Toyota Tundra and 2005 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

Inspect AM1 M-fuse and ECU-IG fuse.
PREPARATION:
1. Remove the M-fuse from the engine room relay block.
2. Remove the fuse from the driver side J/B.
CHECK:

Check the continuity.

OK:

Continuity
1. NG : Replace M-fuse and/or fuse.
2. OK : Go to next step.

Inspect ignition switch.

CHECK:

Check the switch continuity.

Fig 1: Inspecting Ignition Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:

IGNITION SWITCH

Switch Position	Tester Connection	Specified Condition
LOCK	-	No continuity
ACC	2 - 3	Continuity
ON	2 - 3 - 4 6 - 7	Continuity
START	1 - 2 - 4 6 - 7 - 8	Continuity

NG : Replace ignition switch.
OK : Go to next step.

Check voltage between terminal IG of TVIP ECU and body ground.

PREPARATION:

Disconnect the T12 TVIP ECU connector.

CHECK:

Check the voltage between the T12 TVIP ECU wire harness side connector and body ground.

Fig 2: Checking Voltage Between Terminal IG Of TVIP ECU And Body Ground

OK:

TERMINAL IG OF TVIP ECU AND BODY GROUND

Symbols (Terminal No.)	Specified Condition
IG (T12-13) Below 1 Ω Body ground	10 - 14V

NG : Repair or replace harness and connector.
OK : Replace TVIP ECU.