Description
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:
Component Function Check
1.START
Make sure that all of the following conditions are satisfied.
*: 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 >> Proceed to EC-158, "Diagnosis Procedure".
Diagnosis Procedure
OVERALL SEQUENCE
DETAILED PROCEDURE
1.CHECK “A/F ALPHA-B1”
With CONSULT
NOTE: Check “A/F ALPHA-B1” for approximately 1 minute because they 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.
NO-1 >> Less than the SP value: GO TO 2.
NO-2 >> 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.
NO-1 >> More than the SP value: GO TO 6.
NO-2 >> Less than the SP value: GO TO 25.
4.CHECK “A/F ALPHA-B1”
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-144, "Work Procedure".) Is the inspection result normal? YES >> GO TO 9.
NO-1 >> Fuel pressure is too high: Replace “fuel filter and fuel pump assembly”, refer to FL-6, "Removal and Installation", and then GO TO 8.
NO-2 >> 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-6, "Removal and Installation", and then GO TO 8.
NO >> Repair or replace and then GO TO 8.
8.CHECK “A/F ALPHA-B1”
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-40, "Removal and Installation", and then GO TO 11.
NO >> Repair or replace malfunctioning part and then GO TO 11.
11.CHECK “A/F ALPHA-B1”
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 ALPHA-B1”
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 ALPHA-B1”
Is the measurement value within the SP value? YES >> INSPECTION END
NO >> Detect malfunctioning part according to EC-486, "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
NO-1 >> More than the SP value: GO TO 18.
NO-2 >> Less than the SP value: GO TO 25.
18.DETECT MALFUNCTIONING PART
>> 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 ALPHA-B1”, AND “B/FUEL SCHDL”
Select “A/F ALPHA-B1” and “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and make sure that the 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 ALPHA-B1” is less than the SP value: GO TO 21.
21.DISCONNECT AND RECONNECT MASS AIR FLOW SENSOR HARNESS CONNECTOR
>> GO TO 22.
22.CHECK “A/F ALPHA-B1”
Is the measurement value within the SP value? YES >> Detect malfunctioning part of mass air flow sensor circuit and repair it. Refer to EC-198, "DTC Description". Then GO TO 29.
NO >> GO TO 23.
23.CHECK “MASS AIR FLOW SENSOR (HZ)”
Select “MASS AIR FLOW SENSOR (Hz)” 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-24, "Removal and Installation", and then GO TO 29.
24.REPLACE ECM
Replace ECM. Refer to EC-499, "Removal and Installation".
>> GO TO 29.
25.CHECK INTAKE SYSTE
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 “MASS AIR FLOW SENSOR (HZ)”
Select “MASS AIR FLOW SENSOR (Hz)” 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-24, "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 ALPHA-B1” AND “B/FUEL SCHDL”
Select “A/F ALPHA-B1” and “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 >> Detect malfunctioning part according to EC-486, "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-486, "Symptom Table".
USB (Universal Serial Bus) Connection Port (models with Navigation System)
(if so equipped)
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Connecting a device to the USB
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WARNINGDo not connect, disconnect, or operate the
USB device while driving. Doing so can be
a distraction. If distracted you could lose
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Select FR WIPER STOP of BCM (WIPER) data monitor item.
Operate the front wiper.
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Is the inspection result normal?
YES ...