On-Vehicle Inspection

HINT:

The IG1 NO. 1 relay is built in the engine room junction block. Since the relay is constructed with a relay block that is in the junction block as a unit, it is impossible to disconnecting the wire harness connecting with the relay block.

If the relay has a malfunction, replace it with the junction block assembly wire harness together.

CHECK ENGINE ROOM JUNCTION BLOCK (IG1 NO. 1)

Disconnect the engine room relay block from the vehicle body.

Fig 1: Disconnecting Engine Room Relay Block From Vehicle Body
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the continuity of the relay.

OK: GO TO NEXT STEP

TESTER CONNECTION SPECIFIED CONDITION

Always	Tester Connection	Specified Condition
Constant	1B-50 - 1B-40	Continuity
Apply B+ between terminals 1B-50 - 1B-40	1C-2 - 1B-47	Continuity

If the continuity is not as specified, replace the engine room junction block.

Install the engine room relay block to the vehicle body.

Fig 2: Checking Engine Room Junction Block (IG1 No. 1)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK IG1 NO. 2 RELAY (Marking: IG1 NO. 2)

Remove the relay from the cowl side junction block LH.

Measure the resistance of the relay.

Standard resistance

IG1 NO. 2 RELAY

Tester Connection	Specified Condition
3 - 5	10 kΩ or higher
3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

Fig 3: Checking IG1 No. 2 Relay

If the result is not as specified, replace the relay.

Install the relay.

CHECK IG1 NO. 3 RELAY (Marking: IG1 NO. 3)

Remove the relay from the cowl side junction block RH.

Measure the resistance of the relay.

Standard resistance

IG1 NO. 3 RELAY

Tester Connection	Specified Condition
3 - 5	10 kΩ or higher
3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

If the result is not as specified, replace the relay.