Go to step

READ VALUE OF INTELLIGENT TESTER (OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR)

Connect an intelligent tester to the DLC3. Turn the ignition switch ON and turn the tester ON. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / O2S B1S2 or O2S B2S2. Allow the engine to idle.

Read the Heated Oxygen (HO2) sensor output voltage while idling.

Result

HO2 Sensor Output Voltages

Proceed To

More than 1.2 V

A

Less than 1.0 V

Go to step 5

CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)

HT1B

OX1B

ECM Connector HT2B

HT1B

OX1B

ECM Connector HT2B

(a) Turn the ignition switch OFF and wait for 5 minutes.

(b) Disconnect the E4 or E5 ECM connector.

(c) Check the resistance. Standard Resistance

Tester Connections

Specified Conditions

HT1B (E4-1) - OX1B (E4-18)

10 kQ or higher

HT2B (E5-5) - OX2B (E5-33)

(d) Reconnect the ECM connector.

NG

Go to step 4

REPLACE ECM

INSPECT HEATED OXYGEN SENSOR (CHECK FOR SHORT)

(a) Disconnect the H3 or H4 HO2 sensor connector.

(b) Check the resistance. Standard Resistance

Tester Connections

Specified Conditions

+B (2) - E2 (4)

10 kQ or higher

+B (2) - OX1B or OX2B (3)

(c) Reconnect the HO2 sensor connector.

REPLACE HEATED OXYGEN SENSOR

REPLACE HEATED OXYGEN SENSOR

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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