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Toyota Prius: Relay

On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT CIRCUIT OPENING RELAY ASSEMBLY (C/OPN)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Result

3 - 5

Auxiliary battery voltage is not applied between terminals 1 and 2

10 kΩ or higher

3 - 5

Auxiliary battery voltage is applied between terminals 1 and 2

Below 1 Ω

Ω

If the result is not as specified, replace the circuit opening relay assembly (C/OPN).

2. INSPECT NO. 1 ELECTRONIC FUEL INJECTION MAIN RELAY (EFI-MAIN NO.1)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Result

3 - 5

Auxiliary battery voltage is not applied between terminals 1 and 2

10 kΩ or higher

3 - 5

Auxiliary battery voltage is applied between terminals 1 and 2

Below 1 Ω

Ω

If the result is not as specified, replace the No. 1 electronic fuel injection main relay (EFI-MAIN NO.1).

3. INSPECT NO. 2 ELECTRONIC FUEL INJECTION MAIN RELAY (EFI-MAIN NO.2)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Result

3 - 5

Auxiliary battery voltage is not applied between terminals 1 and 2

10 kΩ or higher

3 - 5

Auxiliary battery voltage is applied between terminals 1 and 2

Below 1 Ω

Ω

If the result is not as specified, replace the No. 2 electronic fuel injection main relay (EFI-MAIN NO.2).

4. INSPECT NO. 3 ELECTRONIC FUEL INJECTION MAIN RELAY (EFI-MAIN NO.3)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Result

3 - 5

Auxiliary battery voltage is not applied between terminals 1 and 2

10 kΩ or higher

3 - 5

Auxiliary battery voltage is applied between terminals 1 and 2

Below 1 Ω

Ω

If the result is not as specified, replace the No. 3 electronic fuel injection main relay (EFI-MAIN NO.3).

5. INSPECT IGP RELAY (IGP)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Result

3 - 5

Auxiliary battery voltage is not applied between terminals 1 and 2

10 kΩ or higher

3 - 5

Auxiliary battery voltage is applied between terminals 1 and 2

Below 1 Ω

Ω

If the result is not as specified, replace the IGP relay (IGP).

Toyota Prius (XW60) 2023-2025 Service Manual

Actual pages

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