Toyota Tundra Service Manual: Ignition Relay No. 2

On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. REMOVE INTEGRATION RELAY

(a) Remove the engine room relay block cover.

(b) Using a screwdriver, detach the 2 claws and remove the integration relay from the engine room relay block. HINT: Tape the screwdriver tip before use.

(c) Disconnect the 3 connectors.

2. INSPECT INTEGRATION RELAY (IG2)

NOTICE:

• Some relays are built into the integration relay. The integration relay cannot be disassembled. If there is a malfunction in the circuit of the integration relay, replace the integration relay.
• The internal circuit of the integration relay is as shown in the illustration below. Inspect the integration relay using the following procedures.

(a) Measure the resistance of the IG2 MAIN fuse.

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

Standard Resistance:

If the result is not as specified, replace the IG2 MAIN fuse.

(b) Measure the resistance of the ignition relay No. 2 (IG2). (1) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition 1C-1 - 1B-8 When battery voltage is not applied to terminals 1B-6 and 1B-7 10 kΩ or higher When battery voltage is applied to terminals 1B-6 and 1B-7 Below 1 Ω If the result is not as specified, replace the integration relay.

3. INSTALL INTEGRATION RELAY

(a) Connect the 3 connectors.

(b) Install the integration relay to the engine room relay block.

(c) Install the engine room relay block cover.