Toyota Tundra Service Manual: A/f Sensor Heater Relay

On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. REMOVE INTEGRATION RELAY

2. INSPECT INTEGRATION RELAY (A/F)

NOTICE:

  • 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.
  • The internal circuit of the integration relay is as shown in the illustration below. Inspect the integration relay using the following procedures.

(a) Measure the resistance of the A/F fuse.

(1) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A/F fuse

Always

Below 1 Ω

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

(b) Measure the resistance of the A/F sensor heater relay.

(1) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

1C-1 - 1A-4

When battery voltage is not applied to terminals 1A-2 and 1A-3

10 kΩ or higher

When battery voltage is applied to terminals 1A-2 and 1A-3

Below 1 Ω

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

3. INSTALL INTEGRATION RELAY

    1ur-fe Engine Control

    Accelerator Pedal

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