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: Identifying Engine Room No. 1 Relay Block Cover
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 Inner Circuit Diagram
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the C/OPN relay.

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

Standard resistance

TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

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

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

Fig 3: Identifying Integration Relay Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance

TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

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

TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

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

Connect a 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

TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

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

Fig 4: Identifying EFI Fuse

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the EFI NO. 2 relay.

Measure the resistance between the terminals.

Standard resistance

TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

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

Connect a 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

TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

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

Fig 5: Rear View Of Integration Relay

Measure the resistance of the INJ relay.

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

Standard resistance

TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

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

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

Standard resistance

TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

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

Fig 6: Front View Of Integration Relay