Ok

CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM)

Wire Harness Side:

® A/F Sensor Connector

A1A+

Sensor 1 Front View

ECM Connector

A11S406E02

(a) Disconnect the A4 A/F sensor connector.

(b) Turn the ignition switch to ON.

(c) Measure the voltage between the +B terminal of the A/F sensor connector and body ground.

Standard Voltage

(g) Reconnect the ECM connector.

(h) Reconnect the A/F sensor connector.

A11S406E02

Tester Connection

Specified Condition

+B (A4-2) - Body ground

9 to 14 V

(d) Turn the ignition switch to OFF.

(e) Disconnect the E4 ECM connector.

(f) Check the resistance.

Standard Resistance (Check for open)

Tester Connections

Specified Conditions

HA1A (A4-1) - HA1A (E4-1)

Below 1 Q

A1A+ (A4-3) - A1A+ (E4-21)

Below 1 Q

A1A- (A4-4) - A1A- (E4-31)

Below 1 Q

Standard Resistance (Check for short)

Tester Connections

Specified Conditions

HA1A (A4-1) or HA1A (E4-1) - Body ground

10 kQ or higher

A1A+ (A4-3) or A1A+ (E4-21) - Body ground

10 kQ or higher

A1A- (A4-4) or A1A- (E4-31) - Body ground

10 kQ or higher

Reference (Bank 1 Sensor 1 System Diagram)

A/F Sensor

A/F HEATER

Battery A/F HEATER

DVssO-0

Heater

HA1A

HA1A

A1A-

A1A+

A1A+

A1A-

A1A+

JITLTL

Duty Control

JITLTL

Duty Control

From EFI Relay

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.

Get My Free Ebook


Post a comment