Page 1057 of 3051
14 ADJUSTMENT THROTTLE POSITION SWITCH CLOSED POSITION-I
Without CONSULT-II
1. Loosen throttle position sensor fixing bolts.
2. Confirm that proper vacuum is applied. Refer to Test No. 6. During adjustment, vacuum should be applied.
3. Insert 0.05 mm (0.0020 in) feeler gauge between stopper and throttle drum as shown in the figure.
LEC270
SEF769Z
4. Turn throttle position sensor body counterclockwise until continuity does not exist.
SEF867X
©GO TO 15.
TROUBLE DIAGNOSIS Ð BASIC INSPECTIONSR20DE
Basic Inspection (Models with Throttle Opener) (Cont'd)
EC-632
Page 1058 of 3051

15 ADJUSTMENT THROTTLE POSITION SWITCH CLOSED POSITION-II
Without CONSULT-II
1. Temporarily tighten sensor body fixing bolts as follows.
+Gradually move the sensor body clockwise and stop it when the continuity comes to exist, then temporarily
tighten sensor body fixing bolts.
SEF867X
2. Make sure two or three times that the continuity exists when the throttle valve is closed and continuity does not exist
when it is opened.
3. Remove 0.05 mm (0.0020 in) feeler gauge then insert 0.15 mm (0.0059 in) feeler gauge.
4. Make sure two or three times that the continuity does not exist when the throttle valve is closed.
5. Tighten throttle position sensor.
6. Check the continuity again.
Continuity does not exist while closing the throttle valve.
OK or NG
OK©GO TO 16.
NG©GO TO 14.
16 RESET THROTTLE POSITION SENSOR IDLE POSITION MEMORY
Without CONSULT-II
NOTE:
Always warm up engine to normal operating temperature. If engine is cool, the throttle position sensor idle posi-
tion memory will not be reset correctly.
1. Confirm that proper vacuum is applied. Refer to Test No. 6.
2. Attach blind cap to vacuum port from which vacuum hose to throttle opener was disconnected.
3. Start engine.
4. Warm up engine to normal operating temperature.
5. Stop engine. (Turn ignition switch ªOFFº.)
6. Turn ignition switch ªONº and wait at least 5 seconds.
SEF864V
7. Turn ignition switch ªOFFº and wait at least 10 seconds.
8. Repeat steps 6 and 7, 20 times.
©GO TO 17.
TROUBLE DIAGNOSIS Ð BASIC INSPECTIONSR20DE
Basic Inspection (Models with Throttle Opener) (Cont'd)
EC-633
Page 1059 of 3051
17 CHECK IGNITION TIMING-I
Without CONSULT-II
1. Turn ignition switch ªOFFº.
2. Release vacuum from throttle opener.
3. Remove vacuum pump and vacuum hose from throttle opener.
4. Reinstall original vacuum hose to throttle opener securely.
5. Start engine and warm it up to normal operating temperature.
6. Stop engine and disconnect throttle position sensor harness connector.
SEF770Z
7. Start engine.
8. Check ignition timing at idle using a timing light.
SEF284G
Ignition timing:
15ɱ2É BTDC (in ªPº or ªNº position)
OK or NG
OK©GO TO 18.
NG©1. Adjust ignition timing by turning distributor.
2. GO TO 18.
TROUBLE DIAGNOSIS Ð BASIC INSPECTIONSR20DE
Basic Inspection (Models with Throttle Opener) (Cont'd)
EC-634
Page 1060 of 3051

18 CHECK IGNITION TIMING-II
1. Stop engine.
2. Reconnect throttle position sensor harness connector.
3. Start engine and let it idle.
4. Check ignition timing at idle using a timing light.
SEF984U
Ignition timing:
15ɱ2É BTDC (in ªPº or ªNº position)
OK or NG
OK©GO TO 29.
NG©GO TO 19.
19 PERFORM IDLE AIR VOLUME LEARNING
Refer to ªIdle Air Volume Learningº, EC-581.
Is the result CMPLT or INCMP?
CMPLT or INCMP
CMPLT©GO TO 20.
INCMP©Follow the instruction of ªIdle Air Volume Learningº.
20 CHECK IGNITION TIMING AGAIN
Check ignition timing again. Refer to Test No. 12 (With CONSULT-II) or 18 (Without CONSULT-II).
OK or NG
OK (With CONSULT-II)©GO TO 26.
OK (Without CONSULT-
II)©GO TO 29.
NG©GO TO 21.
21 CHECK FOR INTAKE AIR LEAK
1. Start engine and let it idle.
2. Listen for an air leak from PCV hose and after IACV-AAC valve.
OK or NG
OK©GO TO 23.
NG©GO TO 22.
22 REPAIR MALFUNCTION
1. Stop engine.
2. Repair or replace malfunctioning part.
©GO TO 19.
TROUBLE DIAGNOSIS Ð BASIC INSPECTIONSR20DE
Basic Inspection (Models with Throttle Opener) (Cont'd)
EC-635
Page 1061 of 3051

23 DETECT MALFUNCTIONING PART
Check the IACV-AAC valve circuit and function. Refer to EC-863 (Models with Euro-OBD system) or EC-995 (Models with-
out Euro-OBD system).
OK or NG
OK©GO TO 25.
NG©GO TO 24.
24 REPAIR MALFUNCTION
Repair or replace malfunction part following the ªDiagnostic Procedureº corresponding the detected malfunction.
©GO TO 19.
25 CHECK ECM FUNCTION
1. Substitute another known good ECM to check ECM function.
(ECM may be the cause of a problem, but this is rarely the case.)
2. Perform initialization of NATS system and registration of NATS ignition key IDs. Refer to ªNATS (Nissan Anti-theft
System)º, EC-597.
©GO TO 19.
26 CHECK TARGET IDLE SPEED
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Select ªENG SPEEDº in ªDATA MONITORº mode.
3. Check idle speed.
750±50 rpm (in ªPº or ªNº position)
OK or NG
OK©GO TO 32.
NG©GO TO 27.
27 PERFORM IDLE AIR VOLUME LEARNING
Refer to ªIdle Air Volume Learningº, EC-581.
Is the result CMPLT or INCMP?
CMPLT or INCMP
CMPLT©GO TO 28.
INCMP©Follow the instruction of ªIdle Air Volume Learningº.
28 CHECK TARGET IDLE SPEED AGAIN
1. Start engine and warm it up to normal operating temperature.
2. Select ªENG SPEEDº in ªDATA MONITORº mode with CONSULT-II.
3. Check idle speed.
750±50 rpm (in ªPº or ªNº position)
OK or NG
OK©GO TO 32.
NG©GO TO 21.
TROUBLE DIAGNOSIS Ð BASIC INSPECTIONSR20DE
Basic Inspection (Models with Throttle Opener) (Cont'd)
EC-636
Page 1062 of 3051
29 CHECK TARGET IDLE SPEED
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Check idle speed.
750±50 rpm (in ªPº or ªNº position)
OK or NG
OK©GO TO 32.
NG©GO TO 30.
30 PERFORM IDLE AIR VOLUME LEARNING
Refer to ªIdle Air Volume Learningº, EC-581.
Is the result CMPLT or INCMP?
CMPLT or INCMP
CMPLT©GO TO 31.
INCMP©Follow the instruction of ªIdle Air Volume Learningº.
31 CHECK TARGET IDLE SPEED AGAIN
1. Start engine and warm it up to normal operating temperature.
2. Check idle speed.
750±50 rpm (in ªPº or ªNº position)
OK or NG
OK©GO TO 32.
NG©GO TO 21.
32 ERASE UNNECESSARY DTC
After this inspection, unnecessary DTC No. might be displayed.
Erase the stored memory in ECM and TCM (Transmission control module).
Refer to ªHOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATIONº, EC-594, 596 and ªHOW TO ERASE
DTCº, AT-19 .
©INSPECTION END
TROUBLE DIAGNOSIS Ð BASIC INSPECTIONSR20DE
Basic Inspection (Models with Throttle Opener) (Cont'd)
EC-637
Page 1063 of 3051

Basic Inspection (Models without Throttle
Opener)
=NLEC1930Precaution:
Perform Basic Inspection without electrical or mechanical
loads applied;
+Headlamp switch is OFF,
+On vehicles equipped with daytime running light system, set
lighting switch to the 1st position to light only small lamps.
+Air conditioner switch is OFF,
+Rear window defogger switch is OFF,
+Steering wheel is in the straight-ahead position, etc.
1 INSPECTION START
1. Check service records for any recent repairs that may indicate a related problem, or the current need for scheduled
maintenance.
2. Open engine hood and check the following:
+Harness connectors for improper connections
+Vacuum hoses for splits, kinks, or improper connections
+Wiring for improper connections, pinches, or cuts
+Air cleaner clogging
+Hoses and ducts for leaks
SEF983U
©GO TO 2.
2 CHECK THROTTLE DRUM OPERATION
Confirm that throttle drum is in contact with the stopper.
OK or NG
OK (with CONSULT-II)©GO TO 5.
OK (without CONSULT-
II)©GO TO 8.
NG©GO TO 3.
3 CHECK ACCELERATOR WIRE INSTALLATION
Check accelerator wire for slack.
OK or NG
OK©GO TO 4.
NG©Adjust accelerator wire. Refer to FE section, ªAdjusting Accelerator Wireº.
TROUBLE DIAGNOSIS Ð BASIC INSPECTIONSR20DE
Basic Inspection (Models without Throttle Opener)
EC-638
Page 1064 of 3051

4 CHECK THROTTLE VALVE OPERATION
1. Remove intake air ducts.
2. Check throttle valve operation when moving throttle drum by hand.
OK or NG
OK©Retighten the throttle drum fixing nuts.
NG©Clean the throttle body and throttle valve.
5 CHECK CLOSED THROTTLE POSITION SWITCH IDLE POSITION
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Stop engine.
3. Turn ignition switch ªONº.
4. Select ªTHRTL POS SENº and ªCLSD THL POSº in ªDATA MONITORº mode with CONSULT-II.
5. Make sure that ªTHRTL POS SENº indicates 0.35 to 0.65V, and ªCLSD THL POSº indicates ªONº. (Accelerator pedal is
fully released).
NEF238A
OK or NG
OK©GO TO 11.
NG©GO TO 6.
6 ADJUSTMENT THROTTLE POSITION SENSOR IDLE POSITION
With CONSULT-II
1. Loosen throttle position sensor fixing bolts.
2. Turn throttle position sensor body clockwise or counterclockwise until ªTHRTL POS SENº indication becomes 0.35 to
0.65V.
SEF964W
3. Tighten the throttle position sensor fixing bolts.
©GO TO 7.
TROUBLE DIAGNOSIS Ð BASIC INSPECTIONSR20DE
Basic Inspection (Models without Throttle Opener) (Cont'd)
EC-639