Duty Ratio

-OGND

4. Waveform 4

40 % Duty Ratio

5. Waveform 5

80 % Duty Ratio

HINT:

• By using an intelligent tester to perform the AIR INJ CHECK operation in the SYSTEM CHECK, the air-fuel ratio and the pressure in the secondary air injection system passage can be checked while the secondary air injection system is operating. This helps technicians to troubleshoot the system when it malfunctions.

• Read freeze frame data using an intelligent tester. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data, from the time the malfunction occurred.

INSPECT AIR PUMP ASSEMBLY

(a) Disconnect the A9 air pump connector.

(b) Measure the air pump resistance. Standard Resistance

Tester Connections

Specified Conditions

Air pump (A9-1 ) - Air pump (A9-2)

0.4 to 10 n at 20°C (68°F)

(c) Reconnect the air pump connector.

REPLACE AIR PUMP ASSEMBLY

CHECK HARNESS AND CONNECTOR (AIR PUMP - BODY GROUND)

Wire Harness Side:

Air Pump Connector

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2

—x

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Front View

Y

G037119E03

(a) Disconnect the A9 air pump connector.

(b) Check the resistance. Standard Resistance

Tester Connections

Specified Conditions

Air Pump (A9-1) - Body ground

Below 1 Q

(c) Reconnect the air pump connector.

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REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK HARNESS AND CONNECTOR (AIR PUMP - AIR INJECTION CONTROL DRIVER)

Wire Harness Side:

Air Pump Connector

(a) Disconnect the A9 air pump connector.

(b) Disconnect the A6 AID connector.

(c) Check the resistance. Standard Resistance

Tester Connections

Specified Conditions

Air Pump (A9-2) - AID (A6-2)

Below 1 Q

Front View VB

Wire Harness Side:

AID Connector

(d) Reconnect the air pump connector.

(e) Reconnect the AID connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

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r

—, N

1

I 2 1

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Front View

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

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