For Mexico
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
Description
The specification (SP) value indicates the tolerance of the value that is displayed in "SPEC" in "DATA MONITOR" mode of CONSULT during normal operation of the Engine Control System. When the value in "SPEC" in
"DATA MONITOR" mode is within the SP value, the Engine Control System is confirmed OK. 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 items:
- B/FUEL SCHDL (The fuel injection pulse width programmed into ECM prior to any learned on board correction)
- A/F ALPHA-B1/B2 (The mean value of air-fuel ratio feedback correction factor per cycle)
- MAS A/F SE-B1/B2 (The signal voltage of the mass air flow sensor)
- IDLE FUEL PRES MAX/MIN (the signal voltage of the fuel rail pressure sensor)
Component Function Check
1. PRECONDITIONING
Check that all of the following conditions are satisfied.
TESTING CONDITION
- Vehicle driven distance: More than 5,000 km (3,107 miles)
2
- Barometric pressure: 98.3 - 104.3 kPa (0.983 - 1.043 bar, 1.003 - 1.064 kg/cm, 14.25 - 15.12 psi)
- Atmospheric temperature: 20 - 30�C (68 - 86�F)
- Engine coolant temperature: 75 - 95�C (167 - 203�F)
- Transmission: Warmed-up
- After the engine is warmed up to normal operating temperature, drive vehicle until "ATF TEMP 2" (A/T fluid temperature sensor signal) indicates more than 60�
C (140�F).
- Electrical load: Not applied
- Rear window defogger switch, air conditioner switch and lighting switch are OFF. Steering wheel is straight ahead.
- Engine speed: Idle
- Gear position: Neutral (or parking)
- GO TO 2.
2. PERFORM SPEC IN DATA MONITOR MODE
WITH CONSULT
NOTE:
Perform "SPEC" in "DATA MONITOR" mode in maximum scale display.
1.Perform "Work Procedure" For Mexico.
2.Select "B/FUEL SCHDL", "A/F ALPHA-B1", "A/F ALPHA-B2", "MAS A/F SE-B1" in "SPEC" of "DATA
MONITOR" mode with CONSULT.
3.Check that monitor items are within the SP value.
Is the measurement value within the SP value?
YES- INSPECTION END
NO- Proceed to "Diagnosis Procedure" .
Diagnosis Procedure
OVERALL SEQUENCE
DETAILED PROCEDURE
1. CHECK "A/F ALPHA-B1" AND "A/F ALPHA-B2"
WITH CONSULT
1.Start engine.
2.Check that the testing conditions are met. Refer to "Component Function Check" .
3.Select "A/F ALPHA-B1" and "A/F ALPHA-B2" in "SPEC" of "DATA MONITOR" mode, and check that each indication is within the SP value.
NOTE:
Check "A/F ALPHA-B1" and "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.
Is the measurement value within the SP value?
YES- GO TO 14.
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 check 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 16.
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.
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 22.
4. CHECK "A/F ALPHA-B1", "A/F ALPHA-B2"
1.Stop the engine.
2.Disconnect PCV hose, and then plug it.
3.Start engine.
4.Select "A/F ALPHA-B1" and "A/F ALPHA-B2" in "SPEC" of "DATA MONITOR" mode, and check that each indication is within the SP value.
Is the measurement value within the SP value?
YES- GO TO 5.
NO- GO TO 6.
5. CHANGE ENGINE OIL
1.Stop the engine.
2.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.
- INSPECTION END
6. PERFORM POWER BALANCE TEST
1.Perform "POWER BALANCE" in "ACTIVE TEST" mode.
2.Check that each cylinder produces a momentary engine speed drop.
Is the inspection result normal?
YES- GO TO 9.
NO- GO TO 7.
7. DETECT MALFUNCTIONING PART
Check the following below.
- Ignition coil and its circuit (Refer to "Component Function Check" For Mexico.)
- Fuel injector and its circuit (Refer to "Component Function Check" For Mexico.)
- Intake air leakage
- Low compression pressure (Refer to "Inspection" Testing and Inspection.)
Is the inspection result normal?
YES- Replace fuel injector and then GO TO 8.
NO- Repair or replace malfunctioning part and then GO TO 8.
8. CHECK "A/F ALPHA-B1" AND "A/F ALPHA-B2"
1.Start engine.
2.Select "A/F ALPHA-B1" and "A/F ALPHA-B2" in "SPEC" of "DATA MONITOR" mode, and check that each indication is within the SP value.
Is the measurement value within the SP value?
YES- INSPECTION END
NO- GO TO 9.
9. CHECK A/F SENSOR 1 FUNCTION
Perform all DTC CONFIRMATION PROCEDURE related with A/F sensor 1.
- For DTC P0130, P0150, refer to "DTC Logic" For Mexico.
- For DTC P0131, P0151, refer to "DTC Logic" For Mexico.
- For DTC P0132, P0152, refer to "DTC Logic" For Mexico.
- For DTC P0133, P0153, refer to "DTC Logic" For Mexico.
Are any DTCs detected?
YES- GO TO 10.
NO- GO TO 12.
10. CHECK A/F SENSOR 1 CIRCUIT
Perform Diagnosis Procedure according to corresponding DTC.
- GO TO 11.
11. CHECK "A/F ALPHA-B1" AND "A/F ALPHA-B2"
1.Start engine.
2.Select "A/F ALPHA-B1" and "A/F ALPHA-B2" in "SPEC" of "DATA MONITOR" mode, and check that each indication is within the SP value.
Is the measurement value within the SP value?
YES- INSPECTION END
NO- GO TO 12.
12. DISCONNECT AND RECONNECT ECM HARNESS CONNECTOR
1.Stop the engine.
2.Disconnect ECM harness connector. Check pin terminal and connector for damage, and then reconnect it.
- GO TO 13.
13. CHECK "A/F ALPHA-B1" AND "A/F ALPHA-B2"
1.Start engine.
2.Select "A/F ALPHA-B1" and "A/F ALPHA-B2" in "SPEC" of "DATA MONITOR" mode, and check 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 "Symptom Table" For Mexico.
14. CHECK "B/FUEL SCHDL"
Select "B/FUEL SCHDL" in "SPEC" of "DATA MONITOR" mode, and check 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 15.
NO-2- Less than the SP value: GO TO 22.
15. DETECT MALFUNCTIONING PART
1.Check for the cause of large engine friction. Refer to the following.
-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.
2.Check for the cause of insufficient combustion. Refer to the following.
-Valve clearance malfunction
-Intake valve timing control function malfunction
-Camshaft sprocket installation malfunction, etc.
- Repair or replace malfunctioning part, and then GO TO 27.
16. CHECK INTAKE SYSTEM
Check for the cause of uneven air flow through mass air flow sensor. Refer to the following.
- Crushed air ducts
- Malfunctioning seal of air cleaner element
- Uneven dirt of air cleaner element
- Improper specification of intake air system
Is the inspection result normal?
YES- GO TO 18.
NO- Repair or replace malfunctioning part, and then GO TO 17.
17. 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.
Is the measurement value within the SP value?
YES- INSPECTION END
NO- "B/FUEL SCHDL" is more, "A/F ALPHA-B1" and "A/F ALPHA-B2" are less than the SP value: GO
TO 18.
18. DISCONNECT AND RECONNECT MASS AIR FLOW SENSOR HARNESS CONNECTOR
1.Stop the engine.
2.Disconnect mass air flow sensor harness connector. Check pin terminal and connector for damage and then reconnect it again.
- GO TO 19.
19. CHECK "A/F ALPHA-B1" AND "A/F ALPHA-B2"
1.Start engine.
2.Select "A/F ALPHA-B1" and "A/F ALPHA-B2" in "SPEC" of "DATA MONITOR" mode, and check that each indication is within the SP value.
Is the measurement value within the SP value?
YES- Detect malfunctioning part of mass air flow sensor circuit and repair it. Refer to "Diagnosis Procedure" For Mexico. Then GO TO 26.
NO- GO TO 20.
20. 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.
Is the measurement value within the SP value?
YES- GO TO 21.
NO- More than the SP value: Replace malfunctioning mass air flow sensor, and then GO TO 26.
21. REPLACE ECM
1.Replace ECM.
2.Perform "Work Procedure" For Mexico.
- GO TO 26.
22. CHECK INTAKE SYSTEM
Check for the cause of uneven air flow through mass air flow sensor. Refer to the following.
- Crushed air ducts
- Malfunctioning seal in air cleaner element
- Uneven dirt in air cleaner element
- Improper specification in intake air system
Is the inspection result normal?
YES- GO TO 24.
NO- Repair or replace malfunctioning part, and then GO TO 23.
23. CHECK "B/FUEL SCHDL"
Select "B/FUEL SCHDL" in "SPEC" of "DATA MONITOR" mode, and check 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 24.
24. 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.
Is the measurement value within the SP value?
YES- GO TO 25.
NO- Less than the SP value: Replace malfunctioning mass air flow sensor, and then GO TO 27.
25. CHECK INTAKE SYSTEM
Check for the cause of air leakage after the mass air flow sensor. Refer to the following.
- Disconnection, looseness, and cracks in air duct
- Looseness of oil filler cap
- Disconnection of oil level gauge
- Open stuck, breakage, hose disconnection, or cracks in PCV valve
- Disconnection or cracks in EVAP purge hose, stuck open EVAP canister purge volume control solenoid valve
- Malfunctioning seal in rocker cover gasket
- Disconnection, looseness, or cracks in hoses, such as a vacuum hose, connecting to intake air system parts
- Malfunctioning seal in intake air system, etc.
- GO TO 27.
26. 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.
Is the measurement value within the SP value?
YES- INSPECTION END
NO- Detect malfunctioning part according to "Symptom Table" For Mexico.
27. 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.
Is the measurement value within the SP value?
YES- INSPECTION END
NO- Detect malfunctioning part according to "Symptom Table" For Mexico.