Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT FUSE (1MB, IGN)

Remove the 1MB fuse and IGN fuse from the engine room relay block.

Measure the resistance according to the value(s) in the table below.

Standard resistance

FUSE (1MB, IGN) TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
IMB fuse	Always	Below 1 Ω
IGN fuse	Always	Below 1 Ω

NG: REPLACE FUSE

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - BATTERY AND BODY GROUND)

Disconnect the J26 ECU connector.

Measure the resistance and voltage according to the value(s) in the table below.

Standard resistance

HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - BATTERY AND BODY GROUND) TESTER CONNECTION SPECIFIED CONDITION CHART RESISTANCE

Tester Connection	Condition	Specified Condition
J26-16 (GND) - Body ground	Always	Below 1 Ω

Standard voltage

HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - BATTERY AND BODY GROUND) TESTER CONNECTION SPECIFIED CONDITION CHART VOLTAGE

Tester Connection	Switch Condition	Specified Condition
J26-1 (+B) - Body ground	Always	11 to 14 V
J26-2 (IG) - Body ground	Ignition switch OFF	Below 1 V
J26-2 (IG) - Body ground	Ignition switch ON	11 to 14 V

Fig 1: Identifying J26 ECU Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE