DTC Diagnosis Procedure

1. Start engine and run it at idle.
2. Listen for an exhaust gas leak before three way catalyst 1.

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Is exhaust gas leak detected?

YES>>

Repair or replace.

NO>>

GO TO 2.

Listen for an intake air leak after the mass air flow sensor.

Is intake air leak detected?

YES>>

Repair or replace.

NO>>

GO TO 3.

1. Turn ignition switch OFF.
2. Disconnect corresponding A/F sensor 1 harness connector.
3. Disconnect ECM harness connector.
4. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.

   +			-		Continuity
   A/F sensor 1			ECM
   Bank	Connector	Terminal	Connector	Terminal
   2	F134	3	F142	106	Existed
   		4		105

5. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector and ground.

   +			-	Continuity
   A/F sensor 1
   Bank	Connector	Terminal
   2	F134	3	Ground	Not existed
   		4

   +			-	Continuity
   ECM
   Bank	Connector	Terminal
   2	F142	105	Ground	Not existed
   		106

6. Also check harness for short to power.

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair or replace error-detected parts.

1. Release fuel pressure to zero. Refer to Work Procedure .
2. Install fuel pressure gauge and check fuel pressure. Refer to Work Procedure .

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Replace "fuel filter and fuel pump assembly". Refer to FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY : Removal and Installation .

With CONSULT

1. Install all removed parts.
2. Check "MASS AIR FLOW SENSOR (Hz)" in "DATA MONITOR" mode with CONSULT.

   For specification, Refer to MASS AIR FLOW SENSOR : Service Data .

With GST

1. Install all removed parts.
2. Check mass air flow sensor signal in "Service $01" with GST.

   For specification, Refer to MASS AIR FLOW SENSOR : Service Data .

Is the measurement value within the specification?

YES>>

GO TO 6.

NO>>

Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or grounds. Refer to DTC Diagnosis Procedure .

With CONSULT

1. Start engine.
2. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT.
3. Make sure that each circuit produces a momentary engine speed drop.

Without CONSULT

1. Start engine and let it idle.
2. Listen to each fuel injector operating sound.

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   Clicking sound should be heard.

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Perform trouble diagnosis for FUEL INJECTOR, Refer to Diagnosis Procedure .