2001 NISSAN ALMERA check engine

7 CHECK POWER SUPPLY
1. Stop engine.
2. Turn ªOFFº the rear window defogger switch.
3. Disconnect rear window defogger relay.
4. Check voltage between terminal 3 (LHD models), 5 (RHD models) and ground with CONSULT-II or tester.
SEF626Z
OK or NG
OK©GO TO 8.
NG©Check the following and repair.
+20A fuse
+Harness for open and short between fuse block and rear window defogger relay
8 CHECK REAR WINDOW DEFOGGER RELAY
Refer to ªComponent Inspectionº, EC-590.
OK or NG
OK©GO TO 9.
NG©Replace rear window defogger relay.
9 CHECK REAR WINDOW DEFOGGER INPUT SIGNAL CIRCUIT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 50 and rear window defogger relay terminals 5 (LHD models), 3 (RHD
models).
Refer to wiring diagram.
SEF627Z
3. Also check harness for short to ground and short to power.
OK or NG
OK©GO TO 11.
NG©GO TO 10.
ELECTRICAL LOAD SIGNALQG
Diagnostic Procedure Ð Load Signal Ð (Cont'd)
EC-585

16 CHECK HEADLAMP INPUT SIGNAL CIRCUIT-1
1. Stop engine.
2. Disconnect ECM harness connector.
3. Disconnect lighting switch connector.
4. Check harness continuity between ECM terminal 50 and lighting switch connector terminal 10 under the following con-
ditions.
SEF619Y
5. Also check harness for short to ground and short to power.
OK or NG
OK©GO TO 18.
NG©GO TO 17.
17 DETECT MALFUNCTIONING PART
Check the following.
+Harness connectors M63, F102
+Harness connectors M21, E106
+Joint connector-2
+Harness for open and short between ECM and lighting switch connector
©Repair open circuit or short to ground or short to power in harness or connectors.
18 CHECK HEADLAMP INPUT SIGNAL CIRCUIT-2
1. Stop engine.
2. Disconnect ECM harness connector.
3. Disconnect lighting switch connector.
4. Check harness continuity between ECM terminal 50 and lighting switch connector terminal 9 under the following condi-
tions.
SEF627Y
5. Also check harness for short to ground and short to power.
OK or NG
OK©GO TO 22.
NG©GO TO 19.
ELECTRICAL LOAD SIGNALQG
Diagnostic Procedure Ð Load Signal Ð (Cont'd)
EC-587

19 DETECT MALFUNCTIONING PART
Check the following.
+Harness connectors M63, F102
+Harness connectors M79, E118
+Diode M110
+Joint connector-2
+Harness for open and short between ECM and lighting switch connector
©Repair open circuit or short to ground or short to power in harness or connectors.
20 CHECK HEADLAMP INPUT SIGNAL CIRCUIT
Without Daytime Light system
1. Stop engine.
2. Disconnect ECM harness connector.
3. Disconnect lighting switch connector.
4. Check harness continuity between ECM terminal 50 and lighting switch connector terminal 10 under the following con-
ditions.
SEF161Z
5. Also check harness for short to ground and short to power.
With Daytime Light system
1. Stop engine.
2. Disconnect ECM harness connector.
3. Disconnect headlamp relay LH connector.
4. Check harness continuity between ECM terminal 50 and headlamp relay LH connector terminal 3 under the following
conditions.
SEF445Z
5. Also check harness for short to ground and short to power.
OK or NG
OK©GO TO 22.
NG©GO TO 21.
ELECTRICAL LOAD SIGNALQG
Diagnostic Procedure Ð Load Signal Ð (Cont'd)
EC-588

21 DETECT MALFUNCTIONING PART
Check the following.
+Harness connectors M63, F102
+Harness connectors M159, F174
+Diode E177
+Harness for open and short between ECM and lighting switch connector
©Repair open circuit or short to ground or short to power in harness or connectors.
22 CHECK INTERMITTENT INCIDENT
Perform ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-177.
©INSPECTION END
Diagnostic Procedure Ð Heater Control Panel
(Fan Switch) Ð
NJEC0585
1 CHECK CIRCUIT OVERALL FUNCTION
1. Start engine.
2. Heater fan motor switch ªONº.
3. Check voltage between ECM terminal 51 and ground under the following conditions.
SEF620Y
OK or NG
OK©INSPECTION END
NG©GO TO 2.
ELECTRICAL LOAD SIGNALQG
Diagnostic Procedure Ð Load Signal Ð (Cont'd)
EC-589

2 CHECK INPUT SIGNAL CIRCUIT
1. Stop engine.
2. Disconnect ECM harness connector.
3. Disconnect heater control panel fan switch harness connector.
4. Check harness continuity between ECM terminal 51 and heater fan switch harness connector terminal 18.
Refer to wiring diagram.
Continuity should exist.
5. Also check harness for short to ground and short to power.
OK or NG
OK©Refer to HA-48, ªBLOWER MOTORº.
NG©GO TO 3.
3 DETECT MALFUNCTIONING PART
Check the following.
+Harness connectors M94, F106 (Sedan)
+Harness connectors M73, F111 or M169, F113 (Hatchback)
+Harness for open and short between ECM and heater fan motor switch
©Repair open circuit or short to ground or short to power in harness or connectors.
SEF145XC
Component InspectionNJEC0586REAR WINDOW DEFOGGER RELAYNJEC0586S01Check continuity between terminals 3 and 5.
Conditions Continuity
12V direct current supply between terminals 1 and 2 Yes
No current supply No
If NG, replace relay.
ELECTRICAL LOAD SIGNALQG
Diagnostic Procedure Ð Heater Control Panel (Fan Switch) Ð (Cont'd)
EC-590

SEF289H
PrecautionsNJEC0603+Before connecting or disconnecting the ECM harness
connector, turn ignition switch OFF and disconnect nega-
tive battery terminal. Failure to do so may damage the
ECM because battery voltage is applied to ECM even if
ignition switch is turned off.
SEF881Y
+When connecting ECM harness connectors, push in both
sides of the connector until you hear a click. Maneuver the
lever until you hear the three connectors on the inside
click. Refer to the figure at left.
SEF291H
+When connecting or disconnecting pin connectors into or
from ECM, take care not to damage pin terminals (bend or
break).
Make sure that there are not any bends or breaks on ECM
pin terminal, when connecting pin connectors.
MEF040D
+Before replacing ECM, perform Terminals and Reference
Value inspection and make sure ECM functions properly.
Refer to EC-659.
SAT652J
+If MI illuminates or blinks irregularly when engine is
running, water may have accumulated in fuel filter. Drain
water from fuel filter. If this does not correct the problem,
perform specified trouble diagnostic procedures.
+After performing each TROUBLE DIAGNOSIS, perform
ªDTC Confirmation Procedureº or ªOverall Function
Checkº.
The DTC should not be displayed in the ª DTC Confirma-
tion Procedureº if the repair is completed. The ªOverall
Function Checkº should be a good result if the repair is
completed.
PRECAUTIONSYD
Precautions
EC-600

SEF440Z
Crankcase Ventilation System
DESCRIPTIONNJEC0616In this system, blow-by gas is sucked into the air duct after oil
separation by oil separator in the rocker cover.
SEC692
INSPECTIONNJEC0617Ventilation HoseNJEC0617S011. Check hoses and hose connections for leaks.
2. Disconnect all hoses and clean with compressed air. If any
hose cannot be freed of obstructions, replace.
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTIONYD
Crankcase Ventilation System
EC-613

SEF434Z
Spray Pattern TestNJEC0619S051. Check spray pattern by pumping tester handle one full stroke
per second.
NG spray pattern:
Does not inject straight and strong (B in the figure).
Fuel drips (C in the figure).
Does not inject evenly (D in the figure).
2. If the spray pattern is not correct, replace injection nozzle
assembly.
Electronic Control Fuel Injection Pump
REMOVAL AND INSTALLATIONNJEC0620
JEF350Y
RemovalNJEC0620S011. Remove the parts shown below.
+Engine hood
+Engine coolant (drain)
+Engine cover
+Heater pipe under intake manifold
+Injection tubes
+Right splash cover (with undercover)
+Right front wheel
BASIC SERVICE PROCEDUREYD
Injection Tube and Injection Nozzle (Cont'd)
EC-618