Infiniti FX35, FX50 (S51). Manual — part 798
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
EC-733
< DTC/CIRCUIT DIAGNOSIS >
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2.
Disconnect ECM harness connector. Check pin terminal and connector for damage, and then reconnect it.
>> GO TO 16.
16.
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
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.
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
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
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Noise from engine
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Noise from transmission, etc.
2.
Check for the cause of insufficient combustion. Refer to the following.
-
Valve clearance malfunction
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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.
• 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 21.
NO
>> Repair or replace malfunctioning part, and then GO TO 20.
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.
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 21.
21.
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 22.
EC-734
< DTC/CIRCUIT DIAGNOSIS >
[VK50VE]
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
22.
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
. Then GO TO 29.
NO
>> GO TO 23.
23.
CHECK “MAS A/F SE-B1” AND “MAS A/F SE-B2”
Select “MAS A/F SE-B1” and “MAS A/F SE-B2” 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 24.
NO
>> More than the SP value: Replace malfunctioning mass air flow sensor, and then GO TO 29.
24.
REPLACE ECM
1.
Replace ECM.
2.
EC-579, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (ECM) : Special Repair
.
>> GO TO 29.
25.
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 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 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 27.
27.
CHECK “MAS A/F SE-B1” AND “MAS A/F SE-B2”
Select “MAS A/F SE-B1” and “MAS A/F SE-B2” 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 28.
NO
>> Less than the SP value: Replace malfunctioning mass air flow sensor, and then GO TO 30.
28.
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
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
EC-735
< DTC/CIRCUIT DIAGNOSIS >
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• Malfunctioning seal in intake air system, etc.
>> GO TO 30.
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.
Is the measurement value within the SP value?
YES
>> INSPECTION END
NO
>> Detect malfunctioning part according to
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.
Is the measurement value within the SP value?
YES
>> INSPECTION END
NO
>> Detect malfunctioning part according to
EC-736
< DTC/CIRCUIT DIAGNOSIS >
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POWER SUPPLY AND GROUND CIRCUIT
POWER SUPPLY AND GROUND CIRCUIT
Diagnosis Procedure
INFOID:0000000005237219
1.
CHECK GROUND CONNECTION
1.
Turn ignition switch OFF.
2.
Check ground connection M95. Refer to “Ground Inspection” in
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace ground connection.
2.
CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT
1.
Disconnect ECM harness connector.
2.
Check the continuity between ECM harness connector and ground.
3.
Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors F103, M116
• Harness for open or short between ECM and ground
>> Repair open circuit or short to power in harness or connectors.
4.
CHECK ECM POWER SUPPLY CIRCUIT-I
1.
Reconnect ECM harness connector.
2.
Turn ignition switch ON.
3.
Check the voltage between ECM harness connector terminals.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E10, F10
• Harness connectors F103, M116
• IPDM E/R harness connector E7
• 10 A fuse (No. 44)
• Harness for open or short between ECM and fuse
ECM
Ground
Continuity
Connector
Terminal
F110
6
Ground
Existed
F111
54
M160
123
128
ECM
Voltage
+
–
Connector
Terminal
Connector
Terminal
M160
106
M160
128
Battery voltage
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