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" in "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 illuminate the MIL.
The SP value will be displayed for the following three items:
Component Function Check
1.START
Check that all of the following conditions are satisfied.
2.PERFORM "SPEC" OF "DATA MONITOR" MODE
With CONSULT
NOTE: Perform "SPEC" in "DATA MONITOR" mode in maximum scale display.
Diagnosis Procedure
OVERALL SEQUENCE
DETAILED PROCEDURE
1.CHECK "A/F ALPHA-B1", "A/F ALPHA-B2"
With CONSULT
NOTE: Check "A/F ALPHA-B1", "A/F ALPHA-B2" for approximately 1 minute because they may fluctuate. It is NG if the indication is out of the SP value even a little.
2.CHECK "B/FUEL SCHDL"
Select "B/FUEL SCHDL" in "SPEC" of "DATA MONITOR" mode, and check that the indication is within the SP value.
3.CHECK "B/FUEL SCHDL"
Select "B/FUEL SCHDL" in "SPEC" of "DATA MONITOR" mode, and check that the indication is within the SP value.
4.CHECK "A/F ALPHA-B1", "A/F ALPHA-B2"
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 conditions.
6.CHECK FUEL PRESSURE
Check fuel pressure.
7.DETECT MALFUNCTIONING PART
Check fuel hoses and fuel tubes for clogging.
8.CHECK "A/F ALPHA-B1", "A/F ALPHA-B2"
9.PERFORM POWER BALANCE TEST
10.DETECT MALFUNCTIONING PART
Check the following below.
11.CHECK "A/F ALPHA-B1", "A/F ALPHA-B2"
12.CHECK A/F SENSOR 1 FUNCTION
Perform all DTC CONFIRMATION PROCEDURE related with A/F sensor 1.
13.CHECK A/F SENSOR 1 CIRCUIT
Perform Diagnostic Procedure according to corresponding DTC.
14.CHECK "A/F ALPHA-B1", "A/F ALPHA-B2"
15.DISCONNECT AND RECONNECT ECM HARNESS CONNECTOR
16.CHECK "A/F ALPHA-B1", "A/F ALPHA-B2"
17.CHECK "B/FUEL SCHDL"
Select "B/FUEL SCHDL" in "SPEC" of "DATA MONITOR" mode, and check that the indication is within the SP value
18.DETECT MALFUNCTIONING PART
19.CHECK INTAKE SYSTEM
Check for the cause of uneven air flow via the mass air flow sensor. Refer to the following.
20.CHECK "A/F ALPHA-B1", "A/F ALPHA-B2", AND "B/FUEL SCHDL"
Select "A/F ALPHA-B1", "A/F ALPHA-B2", and "B/FUEL SCHDL" in "SPEC" of "DATA MONITOR" mode, and check that each indication is within the SP value.
21.DISCONNECT AND RECONNECT MASS AIR FLOW SENSOR HARNESS CONNECTOR
22.CHECK "A/F ALPHA-B1", "A/F ALPHA-B2"
23.CHECK "MAS A/F SE-B1"
Select "MAS A/F SE-B1" in "SPEC" of "DATA MONITOR" mode, and check that the indication is within the SP value.
24.REPLACE ECM
25.CHECK INTAKE SYSTEM
Check for the cause of uneven air flow via the mass air flow sensor. Refer to the following.
26.CHECK "B/FUEL SCHDL"
Select "B/FUEL SCHDL" in "SPEC" of "DATA MONITOR" mode, and check that the indication is within the SP value
27.CHECK "MAS A/F SE-B1"
Select "MAS A/F SE-B1" in "SPEC" of "DATA MONITOR" mode, and check that the indication is within the SP value.
28.CHECK INTAKE SYSTEM
Check for the cause of air leakage after the mass air flow sensor. Refer to the following.
29.CHECK "A/F ALPHA-B1", "A/F ALPHA-B2", AND "B/FUEL SCHDL"
Select "A/F ALPHA-B1", "A/F ALPHA-B2", and "B/FUEL SCHDL" in "SPEC" of "DATA MONITOR" mode, and check that each indication is within the SP value.
30.CHECK "B/FUEL SCHDL"
Select "B/FUEL SCHDL" in "SPEC" of "DATA MONITOR" mode, and then check that the indication is within the SP value.
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