Integration Relay: Inspection

INSPECT INTEGRATION RELAY

NOTE:

Some relays are built into the integration relay (unit A). The integration relay cannot be disassembled. If there is a malfunction in the circuit of the integration relay, replace the integration relay.

Fig 1: Disconnecting Integration Relay Claws
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
The internal circuit of the integration relay is as shown in the illustration. Inspect the integration relay using the following procedures.

Fig 2: Integration Relay Internal Circuit Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the C/OPN relay.

Connect the battery's positive (+) lead to terminal 2A-8 and negative (-) lead to terminal 2B-3. Check the resistance between the terminals when battery voltage is applied between the terminals.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
2C-1 - 2B-7	Below 1 Ω
2C-1 - 2B-8	10 kΩ or higher

Connect the battery's positive (+) lead to terminals 2A-8 and 2C-1, and negative (-) lead to terminal 2B-3 and 2B-7. Measure the resistance between terminals 2C-1 and 2B-8 when battery voltage is applied between the terminals.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
2C-1 - 2B-8	Below 1 Ω

Fig 3: Identifying Integration Relay Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the EFI MAIN relay.

Remove the EFI fuse. Measure the resistance between the terminals.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
2A-6 - 2A-7	Below 1 Ω
EFI fuse terminal 2 - terminal 2A-8	10 kΩ or higher

Connect the battery's positive (+) lead to terminal 2A-6 and negative (-) lead to terminal 2A-7. Measure the resistance between EFI fuse terminal 2 and terminal 2A-8 when battery voltage is applied between the terminals.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
EFI fuse terminal 2 - terminal 2A-8	Below 1 Ω

Fig 4: Identifying EFI Fuse And Integration Relay Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the EFI NO. 2 relay.

Measure the resistance between the terminals.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
2A-8 - 2B-3	Below 1 Ω
2B-7 - 2C-1	10 kΩ or higher

Connect the battery's positive (+) lead to terminal 2A-8 and negative (-) lead to terminal 2B-3. Measure the resistance between terminals 2B-7 and 2C-1 when battery voltage is applied between the terminals.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
2B-7 - 2C-1	Below 1 Ω

Fig 5: Identifying Integration Relay Connector Terminals

Measure the resistance of the INJ relay.

Remove the INJ fuse. Measure the resistance between the terminals.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
2A-1 - 2A-3	Below 1 Ω
INJ fuse terminal 2 - terminal 2A-4	10 kΩ or higher

Connect the battery's positive (+) lead to terminal 2A-1 and negative (-) lead to terminal 2A-3. Measure the resistance between the INJ fuse terminals 2 and terminal 2A-4 when battery voltage is applied between the terminals.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified condition
INJ fuse terminal 2 - terminal 2A-4	Below 1 Ω

Fig 6: Identifying INJ Fuse And Integration Relay Connector Terminals