2003 NISSAN ALMERA N16 ecm

5 CHECK HARNESS FOR SHORT CIRCUIT
Check continuity between harness connector E225 terminals 3 (L) , 7 (R) andground.
SEL819Y
OK or NG
OK GO TO 6.
NG Repair harness between harness connector E225 and harness connector E174.
6 CHECK HARNESS FOR SHORT CIRCUIT
1. Disconnect ECM connector.
2. Check continuity between ECM harness connector F114 terminals 94 (L) and86(R).
SEL820Y
OK or NG
OK GO TO 7.
NG Repair harness between ECM and harness connector F115 (LHD models) or F43 (RHD
models).
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
IDX
CAN SYSTEM (TYPE 2)
Trouble Diagnoses (Cont’d)
EL-541

7 CHECK HARNESS FOR SHORT CIRCUIT
Check continuity between ECM harness connector F114 terminals 94 (L), 86 (R) and ground.
SEL821Y
OK or NG
OK GO TO 8.
NG Repair harness between ECM and harness connector F115 (LHD models) or F43 (RHD
models).
8 ECM/COMBINATION METER INTERNAL CIRCUIT INSPECTION
Check components inspection. Refer to “ECM/COMBINATION METER INTERNAL CIRCUIT INSPECTION” (EL-542).
OK or NG
OK Reconnect all connectors to perform “SELF-DIAG RESULTS” and “DATA MONITOR” for
“ENGINE” and “SMART ENTRANCE” displayed on CONSULT-II. Refer to the following.
“DTC U1000, U1001 CAN COMMUNICATION LINE” (WITH EURO-OBD) (EC-116) for
“ENGINE”
“DTC U1000, U1001 CAN COMMUNICATION LINE” (WITHOUT EURO-OBD) (EC-
492) for “ENGINE”
“CAN Communication Line Check” (EL-380) for “SMART ENTRANCE”
NG Replace ECM and/or combination meter.
SEL723Y
Component InspectionNJEL0546ECM/COMBINATION METER INTERNAL CIRCUIT
INSPECTION
NJEL0546S01Remove ECM and combination meter from vehicle.
Check resistance between ECM terminals 94 and 86.
Check resistance between combination meter terminals 26
and 27.
Unit Terminal Resistance value (Ω)
ECM 94 - 86
Approx. 108 - 132
Combination meter 26 - 27
CAN SYSTEM (TYPE 2)
Trouble Diagnoses (Cont’d)
EL-542

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
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
IDX
WIRING DIAGRAM CODES (CELL CODES)
EL-599

Refrigeration System
REFRIGERATION CYCLENJHA0121Refrigerant FlowNJHA0121S01The refrigerant flows in the standard pattern, that is, through the compressor, the condenser, the liquid tank,
through the evaporator, and back to the compressor. The refrigerant evaporation through the evaporator coil
is controlled by an externally equalized expansion valve, located insidethe heater & cooling unit.
Freeze ProtectionNJHA0121S02The compressor cycles go on and off to maintain the evaporator temperaturewithin a specified range. When
the evaporator coil temperature falls below a specified point, the thermocontrol amplifier interrupts the com-
pressor operation. When the evaporator coil temperature rises above the specification, the thermo control
amplifier allows compressor operation.
Refrigerant System ProtectionNJHA0121S03Refrigerant Pressure SensorNJHA0121S0303The refrigerant system is protected against excessively high or low pressures by the refrigerant pressure
sensor, located on the liquid tank. If the system pressure rises above, or falls below the specifications, the
refrigerant pressure sensor detects the pressure inside the refrigerantline and sends the voltage signal to the
ECM. ECM makes the A/C relay go OFF and stops the compressor when pressure onthe high pressure side
detected by refrigerant pressure sensor is over about 2,746 kPa (27.5 bar,28 kg/cm
2, 398 psi) or below about
137 kPa (1.37 bar, 1.4 kg/cm2, 20 psi).
Dual-pressure Switch
NJHA0121S0304The refrigerant system is protected against excessively high or low pressures by the dual-pressure switch,
located on the liquid tank. If the pressure falls out of specifications, the switch opens to interrupt compressor
operation.
Pressure Relief Valve
NJHA0121S0302The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compres-
sor. When the pressure of refrigerant in the system increases to an unusuallevel [more than 3,727 kPa (37.3
bar, 38 kg/cm
2, 540 psi)], the release port on the pressure relief valve automatically opens and releases
refrigerant into the atmosphere.
RHA682H
DESCRIPTIONMANUAL
Refrigeration System
HA-12

System DescriptionNJHA0125SWITCHES AND THEIR CONTROL FUNCTIONSNJHA0125S01
Knob/SwitchKnob/Switch position
Compressor
A/C VENT B/L FOOT D/F DEF REC FRE
A/CON*1
Mode
—
—
—
—
—
Intake
—
—
*1: Compressor is operated by ECM.
DESCRIPTIONMANUAL
System Description
HA-20

20 CHECK CAN COMMUNICATION
Check CAN communication. Refer to EL-509.
Combination meter - Smart entrance control unit
Combination meter - ECM
ECM - Smart entrance control unit
OK or NG
OK INSPECTION END
NG Repair or replace malfunctioning part(s).
MAGNET CLUTCH CIRCUIT (YD ENGINE WITHOUT
COMMON RAIL)
NJHA0203SYMPTOM:
Magnet clutch does not engage when A/C switch and fan
switch are ON.
1 CHECK POWER SUPPLY FOR COMPRESSOR
Disconnect compressor harness connector.
Do approx. 12 volts exist between compressor harness terminal No. 1 and body ground?
RHA794H
YesorNo
Ye s G O T O 2 .
No Disconnect A/C relay. GO TO 3.
2 CHECK MAGNET CLUTCH COIL
Check for operation sound when applying battery voltage direct current toterminal.
RHA256I
OK or NG
NG Replace magnet clutch. Refer to HA-84.
TROUBLE DIAGNOSESMANUAL
Magnet Clutch (Cont’d)
HA-60

6 CHECK COIL SIDE CIRCUIT OF A/C RELAY
Do approx. 12 volts exist between ECM harness terminal No. 204 and body ground?
NHA517
YesorNo
Ye s G O T O 8 .
No Disconnect A/C relay. Disconnect ECM harness connector. GO TO 7.
7 CHECK CIRCUIT CONTINUITY BETWEEN A/C RELAY AND ECM HARNESS
Check circuit continuity between A/C relay harness terminal No. 2 and ECM harness terminal No. 204.
NHA518
Continuity should exist.
If OK, check harness for short.
OK or NG
OK Check ECM. Refer to EC-66 (YD), “ECM Terminals and Reference Value”.
NG Repair harness or connector.
8 CHECK VOLTAGE FOR ECM
Do approx. 12 volts exist between ECM harness terminal No. 403 and body ground?
NHA519
YesorNo
Ye s G O T O 9 .
No Check ECM. Refer to EC-66 (YD), “ECM Terminals and Reference Value”.
TROUBLE DIAGNOSESMANUAL
Magnet Clutch (Cont’d)
HA-62

RHA638H
ELECTRICAL COMPONENT INSPECTIONNJHA0192A/C RelayNJHA0192S01Check continuity between terminal Nos. 3 and 5.
Conditions Continuity
12V direct current supply between terminal Nos. 1 and 2 Yes
No current supply No
If NG, replace relay.
RHA272I
SHA315FD
Refrigerant Pressure SensorNJHA0192S02Make sure that the A/C refrigerant pressure and the sensor output
voltage are within the specified range as shown in the A/C operat-
ing condition figure.
Check voltage between ECM harness terminal No. 69 and body
ground.
RHA282I
Dual-pressure SwitchNJHA0192S03
ON
kPa (bar, kg/cm2, psi)OFF
kPa (bar, kg/cm2, psi)
Low-pressure
sideIncreasing to 157 - 216 (1.57 -
2.16, 1.6 - 2.2, 23 - 31)Decreasing to 157 - 196 (1.57
- 1.96, 1.6 - 2.0, 23 - 28)
High-pressure
sideDecreasing to 1,863 - 2,256
(18.6 - 22.6, 19 - 23, 270 -
327)Increasing to 2,452 - 2,844
(24.5 - 28.4, 25 - 29, 356 -
412)
RHA268I
A/C SwitchNJHA0192S04Check continuity between terminals.
A/C switch Terminals Continuity
ON1-7
Ye s
1-8
OFF1-7
No
1-8
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSESMANUAL
Magnet Clutch (Cont’d)
HA-65