2003 NISSAN ALMERA N16 mass air flow sensor

Diagnostic ProcedureNJEC0648
1 CHECK MAFS POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect mass air flow sensor harness connector.
SEF884Y
3. Turn ignition switch “ON”.
4. Check voltage between mass air flow sensor terminals 2, 4 and ground withCONSULT-II or tester.
SEF297X
OK or NG
OK GO TO 3.
NG GO TO 2.
2 DETECT MALFUNCTIONING PART
Check the following.
Harness connectors E75, F36
Harness for open or short between mass air flow sensor and ECM
Harness for open or short between mass air flow sensor and ECM relay
Repair open circuit or short to ground or short to power in harness or connector.
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DTC P0100 MASS AIR FLOW SENYD
Diagnostic Procedure
EC-81

3 CHECK MAFS GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.
SEF380Y
3. Check harness continuity between mass air flow sensor terminal 3 and engine ground. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK GO TO 5.
NG GO TO 4.
4 DETECT MALFUNCTIONING PART
Check harness for open or short between mass air flow sensor and ECM.
Repair open circuit or short to ground or short to power in harness or connectors.
5 CHECK MAFS INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between mass air flow sensor terminal 1 and ECMterminal 224. Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK GO TO 6.
NG Repair open circuit or short to ground or short to power in harness or connectors.
DTC P0100 MASS AIR FLOW SENYD
Diagnostic Procedure (Cont’d)
EC-82

6 CHECK MASS AIR FLOW SENSOR
1. Reconnect harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
3. Check voltage between ECM terminal 224 (Mass air flow sensor signal) andground.
SEF441Z
4. If the voltage is out of specification, disconnect MAFS harness connector and connect it again.
Then repeat above check.
OK or NG
OK GO TO 7.
NG Replace mass air flow sensor.
7 CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-71.
INSPECTION END
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DTC P0100 MASS AIR FLOW SENYD
Diagnostic Procedure (Cont’d)
EC-83

DescriptionNJEC0764SYSTEM DESCRIPTIONNJEC0764S01
Sensor Input Signal to ECM ECM Function Actuator
Electronic controlled fuel injection pump Fuel injection signal
EGR volume con-
trolEGR volume control
valve Crankshaft position sensor (TDC) Engine speed
Vehicle speed sensor Vehicle speed
Engine coolant temperature sensor Engine coolant temperature
Ignition switch Start signal
Accelerator position sensor Accelerator position
Mass air flow sensor Amount of intake air
Air conditioner switch Air conditioner operation
Electrical load Electrical load signal
This system controls flow rate of EGR led from exhaust manifold
to intake manifold. The opening of the EGR by-pass passage in the
EGR volume control valve changes to control the flow rate. A
built-in step motor moves the valve in steps corresponding to the
ECM output pulses. The opening of the valve varies for optimum
engine control. The optimum value stored in the ECM is determined
by considering various engine conditions.
The EGR volume control valve remains close under the following
conditions.
Engine stopped
Engine starting
Low engine coolant temperature
Excessively high engine coolant temperature
High engine speed
Wide open throttle
SEF908Y
SEF411Y
COMPONENT DESCRIPTIONNJEC0764S02EGR Volume Control ValveNJEC0764S0201The EGR volume control valve uses a step motor to control the flow
rate of EGR from exhaust manifold. This motor has four winding
phases. It operates according to the output pulse signal of the
ECM. Two windings are turned ON and OFF in sequence. Each
time an ON pulse is issued, the valve opens or closes, changing
the flow rate. When no change in the flow rate is needed, the ECM
does not issue the pulse signal. A certain voltage signal is issued
so that the valve remains at that particular opening.
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EGR VOLUME CONTROL SYSTEMYD
Description
EC-197

NJMT0008
SMT928D
RemovalNJMT0008S01CAUTION:
Remove the crankshaft position sensor (POS) from transaxle
assembly before separating transaxle from engine.
Be careful not to damage sensor edge.
1. Remove battery and its bracket.
2. Remove air cleaner box with mass air flow sensor.
SMT130DB
3. Remove clutch operating cylinder from transaxle.
4. Remove clutch hose clamp.
5. Disconnect speedometer pinion, back-up lamp, PNP switch
(F70A) harness connectors and ground harness.
6. Remove starter motor from transaxle.
7. Remove crankshaft position sensor (POS) from transaxle front
side.
8. Remove shift control rod and support rod bracket from tran-
saxle.
9. Drain gear oil from transaxle.
10. Draw out drive shafts from transaxle. Refer to AX-11,
“Removal”.
11. Support engine of transaxle by placing a jack under oil pan.
CAUTION:
Do not place jack under oil pan drain plug.
12. Remove bolts securing center member.
SMT133D
13. Remove LH mount and rear side mounting bolts. Refer to
EM-67, “Removal and Installation”.
14. Remove bolts securing gusset and transaxle.
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REMOVAL AND INSTALLATIONRS5F30A, RS5F70A
Removal
MT-23

NJMT0090
SMT928D
RemovalNJMT0090S01CAUTION:
Remove the crankshaft position sensor (POS) from transaxle
assembly before separating transaxle from engine.
Be careful not to damage sensor edge.
1. Remove battery and its bracket.
2. Remove fuse box from battery bracket.
3. Remove air cleaner box with mass air flow sensor.
4. Remove air breather hose and vacuum pump hose.
SMT650CB
5. Remove terminal and connector from starter motor.
6. Remove starter motor from transaxle.
7. Remove clutch hose clamp.
8. Remove clutch operating cylinder from transaxle.
9. Disconnect speedometer pinion, PNP switch harness connec-
tors and ground harness.
10. Remove crankshaft position sensor (POS) from transaxle front
side.
11. Remove front exhaust tube.
SMT929D
12. Remove shift control rod and support rod bracket from tran-
saxle.
13. Drain gear oil from transaxle.
14. Draw out drive shafts from transaxle. Refer to AX-11,
“Removal”.
15. Support engine and transaxle by placing a jack under the tran-
saxle.
16. Remove bolts securing center member.
SMT950D
17. Take out engine mounting bracket and transaxle installation
bolts. Refer to EM-67, “Removal and Installation”.
18. Remove bolts securing transaxle under side.
19. Temporarily tighten center member.
20. Lower the lift.
REMOVAL AND INSTALLATIONRS5F50A
Removal
MT-26

NJEL0311
Use the chart below to find out what each wiring
diagram code stands for.
Refer to the wiring diagram code in the alphabetical
index to find the location (page number) of each
wiring diagram.
Code Section Wiring Diagram Name
ISTSIG AT A/T 1ST Signal
2NDSIG AT A/T 2ND Signal
3RDSIG AT A/T 3RD Signal
4THSIG AT A/T 4TH Signal
A/C, M HA Manual Air Conditioner
A/CCUT EC Air Conditioner Cut Control
AAC/V EC IACV-AAC Valve
AACVLV EC IACV-AAC Valve
ABS BR Anti-lock Brake System
APS EC Accelerator Position Sensor
AT/C EC A/T Control
ATCONT EC A/T Control
ATDIAG EC A/T Diagnosis Communication Line
AUDIO EL Audio
BA/FTS AT A/T Fluid Temperature Sensor and
TCM Power Supply
BACK/L EL Back-up Lamp
BRK/SW EC Brake Pedal Position Switch
CHARGE SC Charging System
CHIME EL Warning Chime
CIGAR EL Cigarette Lighter
CKPS EC Crankshaft Position Sensor (POS)
CKPS EC Crankshaft Position Sensor (TDC)
CLOCK EL Clock
COOL/F EC Cooling Fan Control
D/LOCK EL Power Door Lock
DEF EL Rear Window Defogger
DTRL EL Headlamp — With Daytime Light
System
ECMRLY EC ECM Relay
ECTS EC Engine Coolant Temperature Sensor
EGR/TS EC EGR Temperature Sensor
EGRC1 EC EGR Function
EGVC/V EC EGR Volume Control Valve
ENGSS AT Engine Speed Signal
Code Section Wiring Diagram Name
F/FOG EL Front Fog Lamp
F/PUMP EC Fuel Pump
FRO2 EC Front Heated Oxygen Sensor (Non
E-OBD)
FRO2/H EC Front Heated Oxygen Sensor Heater
(Non E-OBD)
FTS AT A/T Fluid Temperature Sensor
FUEL EC Fuel Injection System Function
GLOW EC Glow Control System
H/AIM EL Headlamp Aiming Control System
H/LAMP EL Headlamp
H/SEAT EL Heated Seat
HEATER HA Heater System
HLC EL Headlamp Washer
HORN EL Horn
IATS EC Intake Air Temperature Sensor
IATSEN EC Intake Air Temperature Sensor
IGN/SG EC Ignition Signal
ILL EL Illumination
INJECT EC Injector
INJPMP EC Injection Pump
INT/L EL Spot, Vanity Mirror, Personal and
Trunk Room Lamps
IVC EC Intake Valve Timing Control Solenoid
Valve
IVC/V EC Intake Valve Timing Control Solenoid
Valve
KS EC Knock Sensor
LOAD EC Load Signal
LPSV AT Line Pressure Solenoid Valve
MAFS EC Mass Air Flow Sensor
MAIN AT Main Power Supply and Ground Cir-
cuit
MAIN EC Main Power Supply and Ground Cir-
cuit
METER EL Speedometer, Tachometer, Temp.
and Fuel Gauges
MIL/DL EC MIL and Data Link Connectors
MIRROR EL Door Mirror
MULTI EL Multi-remote Control System
NATS EL Nissan Anti-Theft System
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WIRING DIAGRAM CODES (CELL CODES)
EL-599

A
A/C air flow (manual A/C) ..............................HA-19
A/C air flow <0011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100
110024>TC-27
A/C component layout (manual A/C) .............HA-17
A/C compressor clutch removal and
installation (manual A/C).............................HA-82
A/C compressor clutch removal and
installation ...............................................ATC-139
A/C compressor precaution (manual
A/C) <0011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100
1100110011001100110011001100110011[....HA-5
A/C compressor precaution ............................ATC-7
A/C compressor special service tool
(manual A/C) .................................................HA-9
A/C compressor special service tool ............ATC-11
A/C control linkage adjustment (manual
A/C) <0011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100
1100110011001100110011001100110011[..HA-42
A/C control operation (manual A/C) ...............HA-18
A/C diagnostic work flow (manual A/C)..........HA-34
A/C evaporator (manual A/C) .........................HA-87
A/C HFC134a (R134a) system precau-
tion (manual A/C) ..........................................HA-2
A/C HFC134a (R134a) system
precaution <0011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100
110024>TC-4
A/C HFC134a (R134a) system service
procedure (manual A/C) .............................HA-77
A/C HFC134a (R134a) system service
procedure ................................................ATC-133
A/C HFC134a (R134a) system service
tools (manual A/C) ......................................HA-10
A/C HFC134a (R134a) system service
tools<0011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100
110011001100110011001100110011[.ATC-11
A/C HFC134a system service equip-
ment precaution (manual A/C)......................HA-6
A/C HFC134a system service equip-
ment precaution ..........................................ATC-7
A/C lubricant (R134a) (manual A/C) ..............HA-79
A/C lubricant (R134a) ...................................ATC-20
A/C lubrication oil .......................................ATC-150
A/C operational check (manual A/C)..............HA-35
A/C operational check ..................................ATC-51
A/C performance chart (manual A/C).............HA-69
A/C performance test diagnoses
(manual A/C) ...............................................HA-67
A/C performance test diagnoses ..................ATC-89
A/C relay (manual A/C) ..................................HA-65
A/C reray <0011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100
110011001100110024[TC-85
A/C self-diagnoses (auto A/C) ......................ATC-42
A/C service data specification (manual
A/C) <0011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100
1100110011001100110011001100110011[..HA-96
A/C service data specification ....................ATC-150
A/C switch (manual A/C) ................................HA-65
A/C system description (auto A/C) ...............ATC-22
A/C trouble diagnoses (auto A/C) ................ATC-29
A/C, A - Wiring diagram................................ATC-33
A/C, M - Wiring diagram (manual A/C) ..........HA-25
A/CCUT - Wiring diagram (YD engine) ........EC-212
A/T - Wiring diagram - AT - FTS ...................AT-120
A/T - Wiring diagram - AT - MAIN .................AT-341A/T - Wiring diagram - AT - PNP/SW ............AT-114
A/T - Wiring diagram - AT -
VSS A/T........................................AT-127, AT-346
A/T fluid checking ............................................AT-13
A/T fluid replacement ......................................AT-13
A/T fluid temperature sensor.........................AT-123
A/T shift lock system - Wiring diagram .........AT-400
A/T shift lock system .....................................AT-399
A/T trouble diagnoses ........................AT-56, AT-256
A/T Wiring diagram - AT -
ENG SS........................................AT-131, AT-386
A/T Wiring diagram AT - 1ST ........................AT-137
A/T Wiring diagram AT - 2ND .......................AT-143
A/T Wiring diagram AT - 3RD .......................AT-149
A/T Wiring diagram AT - 4TH ........................AT-155
A/T Wiring diagram AT - BA/FTS.....AT-198, AT-380
A/T Wiring diagram AT - LPSV ........AT-167, AT-391
A/T Wiring diagram AT - OVRCSV ..AT-190, AT-370
A/T Wiring diagram AT - SSV/A.......AT-174, AT-360
A/T Wiring diagram AT - SSV/B.......AT-179, AT-365
A/T Wiring diagram AT - TCV ..........AT-162, AT-375
A/T Wiring diagram AT - TPS ..........AT-185, AT-355
A/T Wiring diagrawm AT -
VSSMTR ......................................AT-204, AT-351
ABS (anti-lock brake system).........................BR-45
ABS - Wiring diagram ....................................BR-50
ABS sensor rotor ............................................AX-24
Accelerator control system .........................FE-3, 14
Accelerator pedal position (APP) sen-
sor (QG engine) ..........EC-212, EC-219, EC-346,
EC-538, EC-545, EC-619
Accelerator pedal released position
learning (QG engine)....................EC-31, EC-426
Accelerator position sensor
(YD engine).................................................EC-89
Air bag disposal..............................................RS-35
Air bag precautions ...........................................GI-3
Air bag <0011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100
11001100110011001100110011[...RS-20
Air bleeding (hydraulic clutch) ........................CL-10
Air bleeding for brake system ..........................BR-8
Air cleaner and air duct (QG engine) ............EM-14
Air cleaner filter (QG engine).........................EM-14
Air conditioner cut control
(QG engine)..................................EC-26, EC-421
Air conditioner cut control (YD engine) ..........EC-19
Air flow meter - See Mass air flow sen-
sor (QG engine) .........................EC-135, EC-497
Air flow meter - See Mass air flow sen-
sor (YD engine) ..........................................EC-78
Air mix door control linkage adjustment
(manual A/C) ...............................................HA-44
Air mix door control linkage
adjustment ................................ATC-65, ATC-127
Air mix. door motor.......................ATC-63, ATC-127
Air spoiler, rear................................................BT-47
Alternator <0011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100110011001100
1100110011[...SC-30
Ambient sensor...........ATC-101, ATC-103, ATC-116
Angular tightening application
(QG engine)..................................................EM-3
Angular tightening application
(YD engine) ..................................................EM-3
ALPHABETICAL INDEX
IDX-2