2001 NISSAN ALMERA ignition

8 CHECK VACUUM HOSES AND TUBES
1. Disconnect vacuum hoses between the air control valve (Power steering) and vacuum port, air control valve (Power
steering) and air duct.
2. Check hoses and tubes for cracks, clogging, improper connection or disconnection.
SEF109L
OK or NG
OK©GO TO 9.
NG©Repair hoses or tubes.
9 CHECK IACV-AAC VALVE
Refer to ªComponent Inspectionº, EC-519.
OK or NG
OK©GO TO 11.
NG©GO TO 10.
10 REPLACE IACV-AAC VALVE
1. Replace IACV-AAC valve assembly.
2. Perform ªIdle Air Volume Learningº, EC-57.
Is the result CMPLT or INCMP?
CMPLT or INCMP
CMPLT©INSPECTION END
INCMP©Follow the construction of ªIdle Air Volume Learningº.
11 CHECK TARGET IDLE SPEED
1. Turn ignition switch ªOFFº.
2. Reconnect all harness connectors and vacuum hose.
3. Start engine and warm it up to normal operating temperature.
4. Also warm up transmission to normal operating temperature.
+For A/T models with CONSULT-II, drive vehicle until ªFLUID TEMP SEº in ªDATA MONITORº mode of ªA/Tº system indi-
cates less than 0.9V.
+For A/T models without CONSULT-II and M/T models, drive vehicle for 10 minutes.
5. Stop vehicle with engine running.
6. Check target idle speed.
M/T: 700±50 rpm
A/T: 800±50 rpm (in ªPº or ªNº position)
OK or NG
OK©GO TO 12.
NG©Perform ªIdle Air Volume Learningº, EC-57.
IDLE AIR CONTROL VALVE (IACV) Ð AUXILIARY AIR CONTROL
(AAC) VALVE
QG
Diagnostic Procedure (Cont'd)
EC-518

12 CHECK INTERMITTENT INCIDENT
Perform ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-177.
©INSPECTION END
SEF605Y
SEF089X
Component InspectionNJEC1763IACV-AAC VALVENJEC1763S011) Disconnect IACV-AAC valve harness connector.
2) Check IACV-AAC valve resistance.
Condition Resistance
Terminal 2 and terminals 1, 3
20-24W[at 20ÉC (68ÉF)]
Terminal 5 and terminals 4, 6
3) Reconnect IACV-AAC valve harness connector.
4) Remove idle air adjusting unit assembly (IACV-AAC valve is
built-in) from engine.
(The IACV-AAC valve harness connector should remain con-
nected.)
5) Turn ignition switch ªONº and ªOFFº, and ensure the IACV-
AAC valve shaft smoothly moves forward and backward,
according to the ignition switch position.
If NG, replace the IACV-AAC valve.
IDLE AIR CONTROL VALVE (IACV) Ð AUXILIARY AIR CONTROL
(AAC) VALVE
QG
Diagnostic Procedure (Cont'd)
EC-519

SEF505V
Component DescriptionNJEC1764A closed throttle position switch and wide open throttle position
switch are built into the throttle position sensor unit. The wide open
throttle position switch is used only for A/T control.
When the throttle valve is in the closed position, the closed throttle
position switch sends a voltage signal to the ECM. The ECM only
uses this signal to open or close the EVAP canister purge control
valve when the throttle position sensor is malfunctioning.
ECM Terminals and Reference ValueNJEC1765Specification 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 grond other than ECM terminals, such as the ground.
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
43 Y/PUThrottle position switch
(Closed position)[Ignition switch ªONº]
+Accelerator pedal fully releasedBATTERY VOLTAGE
(11 - 14V)
[Ignition switch ªONº]
+Accelerator pedal depressedApproximately 0V
CLOSED THROTTLE POSITION SWITCH (WHERE FITTED)QG
Component Description
EC-520

Diagnostic ProcedureNJEC1767
1 INSPECTION START
Do you have CONSULT-II?
YesorNo
Ye s©GO TO 2.
No©GO TO 3.
2 CHECK OVERALL FUNCTION
With CONSULT-II
1. Turn ignition switch ªONº.
2. Select ªA/Tº and then select ªDATA MONITORº mode with CONSULT-II.
3. Check indication of ªCLSD THL/P SWº under the following conditions. Measurement must be made with throttle position
switch installed in vehicle.
MTBL0355
OK or NG
OK©GO TO 10.
NG©GO TO 4.
3 CHECK OVERALL FUNCTION
Without CONSULT-II
1. Turn ignition switch ªONº.
2. Check voltage between ECM terminal 40 (closed throttle position switch signal) and ground under the following condi-
tions.
SEC583C
OK or NG
OK©GO TO 11.
NG©GO TO 4.
CLOSED THROTTLE POSITION SWITCH (WHERE FITTED)QG
Diagnostic Procedure
EC-522

4 CHECK POWER SUPPLY
1. Turn ignition switch ªOFFº.
2. Disconnect throttle position switch harness connector.
JEF091Y
3. Turn ignition switch ªONº.
4. Check voltage between terminal 5 and engine ground with CONSULT-II or tester.
SEF250W
Voltage: Battery voltage
OK or NG
OK©GO TO 6.
NG©GO TO 5.
5 DETECT MALFUNCTIONING PART
Check the following.
+Harness connectors E74, F35
+Harness for open or short between throttle position switch and fuse block.
+10A fuse
©Repair harness or connectors.
6 CHECK INPUT SIGNAL CIRCUIT
1. Turn ignition switch ªOFFº.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 40 and throttle position switch harness connector terminal 4.
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 8.
NG©GO TO 7.
CLOSED THROTTLE POSITION SWITCH (WHERE FITTED)QG
Diagnostic Procedure (Cont'd)
EC-523

12 CHECK INTERMITTENT INCIDENT
Perform ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-177.
©INSPECTION END
SEF034Y
Component InspectionNJEC1768CLOSED THROTTLE POSITION SWITCHNJEC1768S01With CONSULT-II
1) Turn ignition switch ªONº.
2) Select ªDATA MONITORº mode in A/T SECTION with CON-
SULT-II.
3) Check indication of ªCLOSED THL/SWº under the following
conditions.
NOTE:
Measurement must be made with closed throttle position
switch installed in vehicle.
Throttle valve conditions CLOSED THL/SW
Completely closed ON
Partially open or completely open OFF
If NG, adjust closed throttle position switch. Refer to ªBasic
Inspectionº, EC-100.
4) If it is impossible to adjust closed throttle position switch in
ªBasic Inspectionº, replace closed throttle position switch.
Without CONSULT-II
1) Disconnect throttle position switch harness connector.
2) Check continuity between terminals 4 and 5 under the follow-
ing conditions. Refer to wiring diagram.
NOTE:
Continuity measurement must be made with closed throttle
position switch installed in vehicle.
Throttle valve conditions Continuity
Completely closed Yes
Partially open or completely open No
If NG, adjust closed throttle position switch. Refer to ªBasic
Inspectionº, EC-100.
3) If it is impossible to adjust closed throttle position switch in
ªBasic Inspectionº, replace closed throttle position switch.
CLOSED THROTTLE POSITION SWITCH (WHERE FITTED)QG
Diagnostic Procedure (Cont'd)
EC-525

4 CHECK POWER SUPPLY
1. Turn ignition switch ªOFFº.
2. Disconnect intake valve timing control solenoid valve harness connector.
SEF149X
3. Turn ignition switch ªONº.
4. Check voltage between terminal 1 and engine ground with CONSULT-II or tester.
SEF619X
OK or NG
OK©GO TO 6.
NG©GO TO 5.
5 DETECT MALFUNCTIONING PART
Check the following.
+Harness connectors F35, E74 (If so equipped)
+Harness connectors M169, F113 (If so equipped)
+10A fuse
+Harness for open or short between valve timing control solenoid valve and fuse
©Repair harness or connectors.
6 CHECK OUTPUT SIGNAL CIRCUIT
1. Turn ignition switch ªOFFº.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 1 and intake valve timing control solenoid valve harness connector
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 7.
NG©Repair open circuit or short to ground to short to power or connectors.
INTAKE VALVE TIMING CONTROL SOLENOID VALVEQG
Diagnostic Procedure (Cont'd)
EC-530

Diagnostic ProcedureNJEC1778
1 CHECK OVERALL FUNCTION
1. Start engine and warm it up to normal operating temperature.
2. Check the voltage between ECM terminals 10, 19, 54, 55, 56 and ground.
SEF791Z
OK or NG
OK©INSPECTION END
NG©GO TO 2.
2 CHECK A/T CONTROL INPUT SIGNAL CIRCUIT FOR OPEN
1. Turn ignition switch ªOFFº.
2. Disconnect ECM harness connector and TCM (Transmission Control Module) harness connector.
SEF116Y
3. Check harness continuity between the following terminals.
YEC057A
Refer to Wiring Diagram.
Continuity should exist.
OK or NG
OK©GO TO 3.
NG©Repair harness or connectors.
A/T COMMUNICATION LINEQG
Diagnostic Procedure
EC-534