Nissan Murano. Manual — part 509
EC-146
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
2.
Disconnect mass air flow sensor harness connector. Check pin terminal and connector for damage and
then reconnect it again.
>> GO TO 22.
22.
CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”
1.
Start engine.
2.
Select “A/F ALPHA-B1”, “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”
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 24.
NO
>> More than the SP value: Replace mass air flow sensor, refer to
GO TO 29.
24.
REPLACE ECM
1.
Replace ECM.
2.
EC-16, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Require-
>> 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”
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 28.
NO
>> Less than the SP value: Replace mass air flow sensor, refer to
,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
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
EC-147
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
• 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 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-148
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
POWER SUPPLY AND GROUND CIRCUIT
POWER SUPPLY AND GROUND CIRCUIT
Diagnosis Procedure
INFOID:0000000009719879
1.
CHECK GROUND CONNECTION
1.
Turn ignition switch OFF.
2.
Check ground connection E38. 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 F121, E7
• 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 OFF and then 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.
• IPDM E/R connector E10
• 10 A fuse (No. 44)
• Harness for open or short between ECM and IPDM E/R
ECM
Ground
Continuity
Connector
Terminal
F7
12
Ground
Existed
16
E16
107
108
111
112
ECM
Voltage
Connector
+
–
Terminal
Terminal
E16
93
112
Battery voltage
POWER SUPPLY AND GROUND CIRCUIT
EC-149
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
E
F
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EC
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>> Repair open circuit, short to ground or short to power in harness or connectors.
6.
CHECK ECM POWER SUPPLY CIRCUIT-II
Check the voltage between ECM harness connector terminals.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> GO TO 9.
7.
CHECK ECM POWER SUPPLY CIRCUIT-III
1.
Turn ignition switch ON.
2.
Check the voltage between IPDM E/R harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Replace IPDM E/R. Refer to
.
8.
CHECK INTERMITTENT INCIDENT
GI-44, "Intermittent Incident"
.
>> INSPECTION END
9.
CHECK ECM POWER SUPPLY CIRCUIT-IV
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Check the voltage between ECM harness connector terminals.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> GO TO 10.
10.
CHECK ECM POWER SUPPLY CIRCUIT-V
1.
Disconnect ECM harness connector.
2.
Disconnect IPDM E/R harness connector.
3.
Check the continuity between ECM harness connector and IPDM E/R harness connector.
ECM
Condition
Voltage
Connector
+
–
Terminal
Terminal
E16
105
112
Ignition switch
ON
→
OFF
After turning ignition switch OFF, battery
voltage will exist for a few seconds, then
drop to approximately 0 V.
IPDM E/R
Ground
Voltage
Connector
Terminal
F12
49
Ground
Battery voltage
53
ECM
Voltage
+
–
Connector
Terminal
Connector
Terminal
F7
24
E16
112
Battery voltage
ECM
IPDM E/R
Continuity
Connector
Terminal
Connector
Terminal
F7
24
F12
69
Existed
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