The specification (SP) value indicates the tolerance of the value that is displayed in "SPEC" of "DATA MONITOR" mode of CONSULT during normal operation of the Engine Control System. When the value in "SPEC" of "DATA MONITOR" mode is within the SP value, the Engine Control System is confirmed OK. When the value in "SPEC" of "DATA MONITOR" mode is NOT within the SP value, the Engine Control System may have one or more malfunctions.
The SP value is used to detect malfunctions that may affect the Engine Control System, but will not light the MIL.
The SP value will be displayed for the following three items:
1.START
- A/T or CVT models: After the engine is warmed up to normal operating temperature, drive vehicle until "FLUID TEMP SE" (A/T or CVT fluid temperature sensor signal) indicates more than 60C (140F).
- M/T models: After the engine is warmed up to normal operating temperature, drive vehicle for 5 minutes.
- Rear window defogger switch, air conditioner switch, lighting switch are OFF. Steering wheel is straight ahead.
>> GO TO 2.
2.PERFORM "SPEC" OF "DATA MONITOR" MODE
With CONSULT
NOTE: Perform "SPEC" in "DATA MONITOR" mode in maximum scale display.
Is the inspection result normal?
YES >> END
NO >> Go to EC, "Diagnosis Procedure".
OVERALL SEQUENCE
DETAILED PROCEDURE
1.CHECK "A/F ALPHAB1"
With CONSULT
NOTE: Check "A/F ALPHAB1" for approximately 1 minute because it may fluctuate. It is NG if the indication is out of the SP value even a little.
Is the measurement value within the SP value?
YES >> GO TO 17.
NO1 >> Less than the SP value: GO TO 2.
NO2 >> More than the SP value: GO TO 3.
2.CHECK "B/FUEL SCHDL"
Select "B/FUEL SCHDL" in "SPEC" of "DATA MONITOR" mode, and make sure that the indication is within the SP value.
Is the measurement value within the SP value?
YES >> GO TO 4.
NO >> More than the SP value: GO TO 19.
3.CHECK "B/FUEL SCHDL"
Select "B/FUEL SCHDL" in "SPEC" of "DATA MONITOR" mode, and make sure that the indication is within the SP value.
Is the measurement value within the SP value?
YES >> GO TO 6.
NO1 >> More than the SP value: GO TO 6.
NO2 >> Less than the SP value: GO TO 25.
4.CHECK "A/F ALPHAB1"
Is the measurement value within the SP value?
YES >> GO TO 5.
NO >> GO TO 6.
5.CHANGE ENGINE OIL
NOTE: This symptom may occur when a large amount of gasoline is mixed with engine oil because of driving conditions (such as when engine oil temperature does not rise enough since a journey distance is too short during winter). The symptom will not be detected after changing engine oil or changing driving condition.
>> INSPECTION END
6.CHECK FUEL PRESSURE
Check fuel pressure. (Refer to EC, "Work Procedure".)
Is the inspection result normal?
YES >> GO TO 9.
NO1 >> Fuel pressure is too high: Replace fuel filter and fuel pump assembly (Refer to FL5, "Exploded View"), and then GO TO 8.
NO2 >> Fuel pressure is too low: GO TO 7.
7.DETECT MALFUNCTIONING PART
Check fuel hoses and fuel tubes for clogging
Is the inspection result normal?
YES >> Replace fuel filter and fuel pump assembly (Refer to FL, "Exploded View"), and then GO TO 8.
NO >> Repair or replace and then GO TO 8.
8.CHECK "A/F ALPHAB1"
Is the measurement value within the SP value?
YES >> INSPECTION END
NO >> GO TO 9.
9.PERFORM POWER BALANCE TEST
Is the inspection result normal?
YES >> GO TO 12.
NO >> GO TO 10.
10.DETECT MALFUNCTIONING PART
Check the following.
Is the inspection result normal?
YES >> Replace fuel injector (Refer to EM, "Removal and Installation"), and then GO TO 11.
NO >> Repair or replace malfunctioning part and then GO TO 11.
11.CHECK "A/F ALPHAB1"
Is the measurement value within the SP value?
YES >> INSPECTION END
NO >> GO TO 12.
12.CHECK A/F SENSOR 1 FUNCTION
Perform all DTC CONFIRMATION PROCEDURE related with A/F sensor 1.
Is any DTC detected?
YES >> GO TO 15.
NO >> GO TO 13.
13.CHECK A/F SENSOR 1 CIRCUIT
Perform DIAGNOSTIC PROCEDURE according to corresponding DTC.
>> GO TO 14.
14.CHECK "A/F ALPHAB1"
Is the measurement value within the SP value?
YES >> INSPECTION END
NO >> GO TO 15.
15.DISCONNECT AND RECONNECT ECM HARNESS CONNECTOR
>> GO TO 16.
16.CHECK "A/F ALPHAB1"
Is the measurement value within the SP value?
YES >> INSPECTION END
NO >> Detect malfunctioning part according to EC, "Symptom Table".
17.CHECK "B/FUEL SCHDL"
Select "B/FUEL SCHDL" in "SPEC" of "DATA MONITOR" mode, and make sure that the indication is within the SP value.
Is the measurement value within the SP value?
YES >> INSPECTION END
NO1 >> More than the SP value: GO TO 18.
NO2 >> Less than the SP value: GO TO 25.
18.DETECT MALFUNCTIONING PART
- Engine oil level is too high
- Engine oil viscosity
- Belt tension of power steering, alternator, A/C compressor, etc. is excessive
- Noise from engine
- Noise from transmission, etc.
- Valve clearance malfunction
- Intake valve timing control function malfunction
- Camshaft sprocket installation malfunction, etc.
>> Repair or replace malfunctioning part, and then GO TO 30.
19.CHECK INTAKE SYSTEM
Check for the cause of uneven air flow through mass air flow sensor. Refer to the following.
Is the inspection result normal?
YES >> GO TO 21.
NO >> Repair or replace malfunctioning part, and then GO TO 20.
20.CHECK "A/F ALPHAB1", AND "B/FUEL SCHDL"
Select "A/F ALPHAB1" and "B/FUEL SCHDL" in "SPEC" of "DATA MONITOR" mode, and make sure that each indication is within the SP value.
Is the measurement value within the SP value?
YES >> INSPECTION END
NO >> "B/FUEL SCHDL" is more, "A/F ALPHAB1" is less than the SP value: GO TO 21.
21.DISCONNECT AND RECONNECT MASS AIR FLOW SENSOR HARNESS CONNECTOR
22.CHECK "A/F ALPHAB1"
Is the measurement value within the SP value?
YES >> Detect malfunctioning part of mass air flow sensor circuit and repair it. Refer to EC, "DTC Logic". Then GO TO 29.
NO >> GO TO 23.
23.CHECK "MAS A/F SEB1"
Select "MAS A/F SEB1" in "SPEC" of "DATA MONITOR" mode, and make sure that the indication is within the SP value.
Is the measurement value within the SP value?
YES >> GO TO 24.
NO >> More than the SP value: Replace mass air flow sensor (Refer to EM, "Removal and Installation"), and then GO TO 29.
24.REPLACE ECM
>> GO TO 29.
25.CHECK INTAKE SYSTEM
Check for the cause of uneven air flow through mass air flow sensor. Refer to the following.
Is the inspection result normal?
YES >> GO TO 27.
NO >> Repair or replace malfunctioning part, and then GO TO 26.
26.CHECK "B/FUEL SCHDL"
Select "B/FUEL SCHDL" in "SPEC" of "DATA MONITOR" mode, and make sure that the indication is within the SP value.
Is the measurement value within the SP value?
YES >> INSPECTION END
NO >> Less than the SP value: GO TO 27.
27.CHECK "MAS A/F SEB1"
Select "MAS A/F SEB1" in "SPEC" of "DATA MONITOR" mode, and make sure that the indication is within the SP value.
Is the measurement value within the SP value?
YES >> GO TO 28.
NO >> Less than the SP value: Replace mass air flow sensor (Refer to EM, "Removal and Installation"), and then GO TO 30.
28.CHECK INTAKE SYSTEM
Check for the cause of air leak after the mass air flow sensor. Refer to the following.
>> GO TO 30.
29.CHECK "A/F ALPHAB1" AND "B/FUEL SCHDL"
Select "A/F ALPHAB1" and "B/FUEL SCHDL" in "SPEC" of "DATA MONITOR" mode, and make sure that each indication is within the SP value.
Is the measurement value within the SP value?
YES >> INSPECTION END
NO >> Detect malfunctioning part according to EC, "Symptom Table".
30.CHECK "B/FUEL SCHDL"
Select "B/FUEL SCHDL" in "SPEC" of "DATA MONITOR" mode, and then make sure that the indication is within the SP value.
Is the measurement value within the SP value?
YES >> INSPECTION END
NO >> Detect malfunctioning part according to EC, "Symptom Table".
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