End

INSPECT AIR-FUEL RATIO SENSOR (HEATER RESISTANCE) (See page ES-S3)

REPLACE AIR-FUEL RATIO SENSOR

INSPECT INTEGRATION RELAY (EFI MAIN RELAY) (See page ES-84)

REPLACE INTEGRATION RELAY (EFI MAIN RELAY)

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

(a) Disconnect the B7 A/F sensor connector.

(b) Turn the ignition switch ON.

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

Standard voltage

Tester Connections

Specified Conditions s to 14 V

(d) Turn the ignition switch OFF.

(e) Disconnect the B30 ECM connector.

(f) Measure the resistance.

Standard resistance (Check for open)

Tester Connections

Specified Conditions

Below 1 O

Below 1 O

Below 1 O

Standard resistance (Check for short)

Tester Connections

Specified Conditions

10 kO or higher

10 kO or higher

10 kO or higher

(g) Reconnect the ECM connector.

(h) Reconnect the A/F sensor connector.

Reference (System Diagram of Sensor 1):

A/F Sensor

EFI MAIN

EFI MAIN

From Battery

Heater

HA1A

HA1A

A1A-

Sensor

A1A+

A1A+

A1A-

MREL

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Duty Control

A127244EG1

Do It Yourself Car Diagnosis

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