2001 NISSAN ALMERA N16 check engine

SEF074X
Overall Function CheckNJEC0242Use this procedure to check the overall function of the three way
catalyst. During this check, a 1st trip DTC might not be confirmed.
Without CONSULT-II
1) Start engine and drive vehicle at a speed of more than 70 km/h
(43 MPH) for 2 consecutive minutes.
2) Stop vehicle with engine running.
3) Set voltmeters probes between ECM terminals 62 (HO2S1
signal), 63 (HO2S2 signal) and engine ground.
4) Keep engine speed at 2,000 rpm constant under no load.
5) Make sure that the voltage switching frequency (high & low)
between ECM terminal 63 and engine ground is much less
than that of ECM terminal 62 and engine ground.
Switching frequency ratio = A/B
A: Heated oxygen sensor 2 (rear) voltage switching fre-
quency
B: Heated oxygen sensor 1 (front) voltage switching fre-
quency
This ratio should be less than 0.75.
If the ratio is greater than above, it means three way catalyst
does not operate properly.
NOTE:
If the voltage at terminal 62 does not switch periodically more
than 5 times within 10 seconds at step 4, perform trouble
diagnosis for DTC P0133 first. (See EC-195.)
Diagnostic ProcedureNJEC0243
1 CHECK EXHAUST SYSTEM
Visually check exhaust tubes and muffler for dent.
OK or NG
OK©GO TO 2.
NG©Repair or replace.
DTC P0420 THREE WAY CATALYST FUNCTIONQG
Overall Function Check
EC-300

2 CHECK EXHAUST AIR LEAK
1. Start engine and run it at idle.
2. Listen for an exhaust air leak before the three way catalyst.
SEF099P
OK or NG
OK©GO TO 3.
NG©Repair or replace.
3 CHECK INTAKE AIR LEAK
Listen for an intake air leak after the mass air flow sensor.
OK or NG
OK©GO TO 4.
NG©Repair or replace.
4 CHECK IGNITION TIMING
Check for ignition timing.
Refer to ªBASIC INSPECTIONº, EC-98.
OK or NG
OK©GO TO 5.
NG©Check camshaft position sensor (PHASE) (EC-278) and crankshaft position sensor
(POS) (EC-272).
DTC P0420 THREE WAY CATALYST FUNCTIONQG
Diagnostic Procedure (Cont'd)
EC-301

5 CHECK INJECTORS
1. Refer to Wiring Diagram for Injectors, EC-447.
2. Stop engine and then turn ignition switch ªONº.
3. Check voltage between ECM terminals 101, 103, 105 and 107 and ground with CONSULT-II or tester.
SEF075X
Battery voltage should exist.
OK or NG
OK©GO TO 6.
NG©Perform ªDiagnostic Procedureº INJECTOR, EC-448.
6 CHECK IGNITION SPARK
1. Disconnect ignition coil assembly from rocker cover.
2. Connect a known good spark plug to the ignition coil assembly.
3. Place end of spark plug against a suitable ground and crank engine.
4. Check for spark.
SEF575Q
OK or NG
OK©GO TO 7.
NG©Check ignition coil, power transistor and their circuits. Refer to EC-451.
7 CHECK INJECTOR
1. Turn ignition switch ªOFFº.
2. Remove injector assembly. Refer to EC-39.
Keep fuel hose and all injectors connected to injector gallery.
3. Disconnect camshaft position sensor harness connector.
4. Turn ignition switch ªONº.
Make sure fuel does not drip from injector.
OK or NG
OK (Does not drip)©GO TO 8.
NG (Drips)©Replace the injector(s) from which fuel is dripping.
DTC P0420 THREE WAY CATALYST FUNCTIONQG
Diagnostic Procedure (Cont'd)
EC-302

ECM Terminals and Reference Value=NJEC0250Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
14 GY/LEVAP canister purge vol-
ume control solenoid valve[Engine is running]
+Warm-up condition
+Idle speedBATTERY VOLTAGE
(11 - 14V)
[Engine is running]
+Warm-up condition
+2,000 rpm5 - 12V
SEF975W
On Board Diagnosis LogicNJEC0251
DTC No. Malfunction is detected when ... Check Items (Possible Cause)
P0443
0443+An improper voltage signal is sent to ECM through the
valve.+Harness or connectors
(The valve circuit is open or shorted.)
+EVAP canister purge volume control solenoid
valve
DTC Confirmation ProcedureNJEC0252NOTE:
If ªDTC Confirmation Procedureº has been previously conducted,
always turn ignition switch ªOFFº and wait at least 9 seconds
before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm battery
voltage is more than 11V.
SEF058Y
With CONSULT-II
1) Turn ignition switch ªONº.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Start engine and let it idle for at least 5 seconds.
4) If 1st trip DTC is detected, go to ªDIAGNOSTIC
PROCEDUREº, EC-307.
With GST
Follow the procedure ªWith CONSULT-IIº above.
DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
(CIRCUIT)
QG
ECM Terminals and Reference Value
EC-305

Diagnostic ProcedureNJEC0254
1 CHECK POWER SUPPLY
1. Turn ignition switch ªOFFº.
2. Disconnect EVAP canister purge volume control solenoid valve harness connector.
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3. Turn ignition switch ªONº.
4. Check voltage between terminals 1 and engine ground with CONSULT-II or tester.
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OK or NG
OK©GO TO 3.
NG©GO TO 2.
2 DETECT MALFUNCTIONING PART
Check the following.
+Harness connectors M169, F113
+10A fuse
+Harness for open or short between EVAP canister purge volume control solenoid valve and fuse
©Repair harness or connectors.
3 CHECK OUTPUT SIGNAL CIRCUIT
1. Turn ignition switch ªOFFº.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 14 and terminal 2.
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 4.
NG©Repair open circuit or short to ground or short to power in harness or connectors.
DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
(CIRCUIT)
QG
Diagnostic Procedure
EC-307

4 CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Refer to ªComponent Inspectionº EC-308.
OK or NG
OK©GO TO 5.
NG©Replace EVAP canister purge volume control solenoid valve.
5 CHECK INTERMITTENT INCIDENT
Perform ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-144.
©INSPECTION END
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SEF079X
Component InspectionNJEC0255EVAP CANISTER PURGE VOLUME CONTROL
SOLENOID VALVE
NJEC0255S01With CONSULT-II
1) Start engine.
2) Perform ªPURG VOL CONT/Vº in ªACTIVE TESTº mode with
CONSULT-II. Check that engine speed varies according to the
valve opening.
If OK, inspection end. If NG, go to following step.
3) Check air passage continuity.
Condition
PURG VOL CONT/V valueAir passage continuity
between A and B
100.0% Yes
0.0% No
If NG or operation takes more than 1 second, replace the
EVAP canister purge volume control solenoid valve.
Without CONSULT-II
Check air passage continuity.
ConditionAir passage continuity
between A and B
12V direct current supply between ter-
minalsYe s
No supply No
If NG or operation takes more than 1 second, replace the EVAP
canister purge volume control solenoid valve.
DTC P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
(CIRCUIT)
QG
Diagnostic Procedure (Cont'd)
EC-308

SEF080X
Component DescriptionNJEC0272The vehicle speed sensor is installed in the transaxle. It contains a
pulse generator which provides a vehicle speed signal to the
speedometer. The speedometer then sends a signal to the ECM.
ECM Terminals and Reference ValueNJEC0273Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
86 PU/R Vehicle speed sensor[Engine is running]
+Lift up the vehicle
+In 2nd gear position
+Vehicle speed is 40 km/h (25 MPH)2.5-3V
SEF976W
On Board Diagnosis LogicNJEC0274
DTC No. Malfunction is detected when ... Check Items (Possible Cause)
P0500
0500+The almost 0 km/h (0 MPH) signal from vehicle speed
sensor is sent to ECM even when vehicle is being
driven.+Harness or connector
(The vehicle speed sensor circuit is open or
shorted.)
+Vehicle speed sensor
DTC Confirmation ProcedureNJEC0275CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If ªDTC Confirmation Procedureº has been previously conducted,
always turn ignition switch ªOFFº and wait at least 9 seconds
before conducting the next test.
TESTING CONDITION:
This procedure may be conducted with the drive wheels lifted
in the shop or by driving the vehicle. If a road test is expected
to be easier, it is unnecessary to lift the vehicle.
DTC P0500 VEHICLE SPEED SENSOR (VSS)QG
Component Description
EC-309

CONSULT-II Reference Value in Data Monitor
Mode
NJEC0280
MONITOR ITEM CONDITION SPECIFICATION
IACV-AAC/V+Engine: After warming up
+Air conditioner switch: OFF
+Shift lever: ªNº
+No-loadIdle 5 - 25 steps
2,000 rpm Ð
ECM Terminals and Reference ValueNJEC0281Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
6
7
15
16BR
LG
P
ORIACV-AAC valve[Engine is running]
+Warm-up condition
+Idle speed0.1 - 14V
On Board Diagnosis LogicNJEC0282
DTC No. Malfunction is detected when ... Check Items (Possible Cause)
P0505
0505+An improper voltage signal is sent to ECM through the
valve.+Harness or connectors
(The IACV-AAC valve circuit is open.)
+IACV-AAC valve
SEF058Y
DTC Confirmation ProcedureNJEC0283NOTE:
+If ªDTC Confirmation Procedureº has been previously
conducted, always turn ignition switch ªOFFº and wait at least
9 seconds before conducting the next test.
+If the target idle speed is out of the specified value, per-
form ªIdle Air Volume Learningº, refer to EC-55, before
conducting ªDTC Confirmation Procedureº. For the target
idle speed, refer to ªSERVICE DATA AND SPECIFICA-
TIONS (SDS)º, EC-489.
With CONSULT-II
1) Turn ignition switch ªONº.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Start engine and warm it up to normal operating temperature.
4) Rev engine from idle to 2,000 rpm 20 times.
If 1st trip DTC is detected, go to ªDIAGNOSTIC
PROCEDUREº, EC-297.
With GST
Follow the procedure ªWith CONSULT-IIº above.
DTC P0505 IDLE AIR CONTROL VALVE (IACV) Ð AUXILIARY AIR CONTROL
(AAC) VALVE
QG
CONSULT-II Reference Value in Data Monitor Mode
EC-314