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 From Engine Room No. 2 Relay Block
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: Internal Circuit (Inner) - 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

STANDARD RESISTANCE SPECIFICATION

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

Fig 3: Identifying C/OPN Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

STANDARD RESISTANCE SPECIFICATION

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

Measure the resistance of the EFI MAIN relay.

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

Standard resistance

STANDARD 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

STANDARD RESISTANCE SPECIFICATION

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

Fig 4: Identifying EFI MAIN Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the EFI NO. 2 relay.

Measure the resistance between the terminals.

Standard resistance

STANDARD 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.

Fig 5: Identifying EFI NO. 2 Relay

Standard resistance

STANDARD RESISTANCE SPECIFICATION

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

Measure the resistance of the INJ relay.

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

Standard resistance

STANDARD 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.

Fig 6: Identifying INJ Relay

Standard resistance

STANDARD RESISTANCE SPECIFICATION

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