On-Vehicle Inspection

DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.

INSPECT INTEGRATION RELAY

NOTE:

The EFI relay is built into the integration relay (unit A: EFI MAIN).
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.

Using a screwdriver, detach the 2 claws and disconnect the integration relay from the engine room No. 1 junction block.
HINT:

Tape the screwdriver tip before use.
Disconnect the 3 connectors from the integration relay.

Fig 1: Disconnecting Connectors From Integration Relay
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Inspect the EFI MAIN relay.

Check the resistance of the EFI MAIN fuse.
If the result is not as specified, replace the EFI MAIN fuse.

Measure the resistance of the integration relay.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
1A-4 - 1C-1	10 kΩ or higher
1A-4 - 1A-1	10 kΩ or higher
1A-4 - 1C-1	Below 1 Ω (when battery voltage is applied to terminals 1A-3 and 1A-2)
1A-4 - 1A-1

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

Fig 2: Identifying EFI MAIN Fuse And 1C Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Inspect the A/F relay.

Check the resistance of the A/F fuse.
If the result is not as specified, replace the A/F fuse.

Measure the resistance of the integration relay.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
1B-8 - 1C-1	10 kΩ or higher
1B-8 - 1B-5	10 kΩ or higher
1B-8 - 1C-1	Below 1 Ω (when battery voltage is applied to terminals 1B-6 and 1B-7)
1B-8 - 1B-5

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

Fig 3: Identifying A/F Relay And 1C Connector