Check Harness And Connector Af Sensor

Wire Harness Side:

(A^ A/F Sensor Connector

A1A+

Sensor 1 Front View

ECM Connector

ECM Connector

A113406E02

(a) Disconnect the A4 air-fuel ratio sensor connector.

(b) Turn the ignition switch to ON.

(c) Measure the voltage between the +B terminal of the air-fuel ratio sensor connector and body ground. Standard Voltage

A113406E02

Tester Connections

Specified Conditions

+B (A4-2) - Body ground

S 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

(g) Reconnect the ECM connector.

(h) Reconnect the air-fuel ratio sensor connector.

Reference (Bank 1 Sensor 1 System Diagram)

A/F Sensor

From Battery

A/F Sensor

From Battery

A118002E04

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK AIR INDUCTION SYSTEM

(a) Check the air induction system for vacuum leakage. OK:

No leakage from air induction system.

REPAIR OR REPLACE AIR INDUCTION SYSTEM

CHECK FUEL PRESSURE

(a) Check the fuel pressure.

REPAIR OR REPLACE FUEL SYSTEM

INSPECT FUEL INJECTOR ASSEMBLY

(a) Check the injector injection (whether fuel volume is high or low, and whether injection pattern is poor).

REPLACE FUEL INJECTOR ASSEMBLY

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