2014 NISSAN TEANA Service Manual

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Page 1201 of 4801

NISSAN TEANA 2014 Service Manual
TROUBLE DIAGNOSIS - SPECIFICATION VALUEEC-201
< DTC/CIRCUIT DIAGNOSIS > [QR25DE]
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>> GO TO 22.
22.CHECK “A/F ALPHA-B1”
1. Start engine.
2. Select “A/F ALPHA-B1�

TROUBLE DIAGNOSIS - SPECIFICATION VALUEEC-201
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>> GO TO 22.
22.CHECK “A/F ALPHA-B1”
1. Start engine.
2. Select “A/F ALPHA-B1” 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 >> Detect malfunctioning part of mass air flow sensor circuit and repair it. Refer to EC-228, "DTC
Logic". 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 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-29, "Removal and Installa-
tion", and then GO TO 29.
24.REPLACE ECM
Replace ECM. Refer to EC-540, "Removal and Installation"
.
>> 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 of air cleaner element
• Uneven dirt of air cleaner element
• Improper specification of 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” m ode, 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 “MAS A/F SE-B1”
Select “MAS A/F SE-B1” 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-29, "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.
• Disconnection, looseness, and cracks in air duct
• Looseness of oil filler cap
• Disconnection of oil level gauge
• Open stuck, breakage, hose disconnection, or cracks of PCV valve
• Disconnection or cracks of EVAP purge hose, open stuck of EVAP canister purge volume control solenoid
valve
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

Page 1202 of 4801

NISSAN TEANA 2014 Service Manual
EC-202
< DTC/CIRCUIT DIAGNOSIS >[QR25DE]
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
• Malfunctioning seal of rocker cover gasket
• Disconnection, looseness, or cracks of hoses, such as vacuum hose

Page 1203 of 4801

NISSAN TEANA 2014 Service Manual
POWER SUPPLY AND GROUND CIRCUITEC-203
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POWER SUPPLY AND GROUND CIRCUIT
Diagnosis ProcedureINFOID:0000000009462152
1.CHECK FUSE
Check

Page 1204 of 4801

NISSAN TEANA 2014 Service Manual
EC-204
< DTC/CIRCUIT DIAGNOSIS >[QR25DE]
POWER SUPPLY AND GROUND CIRCUIT
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 6.
5.CHECK ECM POWER SUPPLY (MAIN)--2
1. Turn ignition switch OF

Page 1205 of 4801

NISSAN TEANA 2014 Service Manual
POWER SUPPLY AND GROUND CIRCUITEC-205
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8.CHECK ECM RELAY CONTROL SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harn

Page 1206 of 4801

NISSAN TEANA 2014 Service Manual
EC-206
< DTC/CIRCUIT DIAGNOSIS >[QR25DE]
POWER SUPPLY AND GROUND CIRCUIT
Check the voltage between ECM harness connector terminals.
*1: Except for California
*2: For California
Is the inspection r

Page 1207 of 4801

NISSAN TEANA 2014 Service Manual
U0101 CAN COMM CIRCUITEC-207
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U0101 CAN COMM CIRCUIT
DescriptionINFOID:0000000009462153
CAN (Controller Area Network) is a serial co

Page 1208 of 4801

NISSAN TEANA 2014 Service Manual
EC-208
< DTC/CIRCUIT DIAGNOSIS >[QR25DE]
U1001 CAN COMM CIRCUIT
U1001 CAN COMM CIRCUIT
DescriptionINFOID:0000000009462156
CAN (Controller Area Network) is a serial communication
line for real time a

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