Last Modified: 11-29-2007 1.6 G
Service Category: Engine/Hybrid System Section: Emission Control
Model Year: 2008 Model: Sequoia Doc ID: RM0000029L900AX
Title: 2UZ-FE EMISSION CONTROL: AIR PUMP: INSPECTION (2008 Sequoia)

INSPECTION

1. INSPECT AIR PUMP ASSEMBLY (for Bank 1)



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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 - 2

20°C (68°F)

0.44 to 1.0 Ω

1 - Body ground

Always

10 kΩ or higher

2 - Body ground

If the result is not as specified, replace the air pump assembly.

(b) Check operation of the air pump assembly.

(1) Check that air does not flow from port A to port B.

If the result is not as specified, replace the air pump assembly.

(2) Apply battery voltage across terminals 1 and 2.

NOTICE:

  • Do not operate the air pump continuously for 2 minutes or more.
  • When operating the air pump, wait 5 minutes until the pump has cooled down between each operation. If the pump has not cooled down sufficiently, the motor will burn out.

(3) Check that air flows from port A to port B.

If the result is not as specified, replace the air pump assembly.

2. INSPECT AIR PUMP ASSEMBLY (for Bank 2)



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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 - 2

20°C (68°F)

0.4 to 1.0 Ω

1 - Body ground

Always

10 kΩ or higher

2 - Body ground

If the result is not as specified, replace the air pump assembly.

(b) Check operation of the air pump assembly.

(1) Check that air does not flow from port A to port B.

If the result is not as specified, replace the air pump assembly.

(2) Apply battery voltage across terminals 1 and 2.

NOTICE:

  • Do not operate the air pump continuously for 2 minutes or more.
  • When operating the air pump, wait 5 minutes until the pump has cooled down between each operation. If the pump has not cooled down sufficiently, the motor will burn out.

(3) Check that air flows from port A to port B.

If the result is not as specified, replace the air pump assembly.