2001 NISSAN PICK-UP sensor

System DescriptionNEEC0015S02
SEF742M
The ignition timing is controlled by the ECM to maintain the best air-fuel ratio for every running condition of
the engine. The ignition timing data is stored in the ECM. This data forms the map shown above.
The ECM receives information such as the injection pulse width and camshaft position sensor signal. Com-
puting this information, ignition signals are transmitted to the power transistor.
e.g., N: 1,800 rpm, Tp: 1.50 msec
AÉBTDC
During the following conditions, the ignition timing is revised by the ECM according to the other data stored
in the ECM.
+At starting
+During warm-up
+At idle
+At low battery voltage
+During acceleration
The knock sensor retard system is designed only for emergencies. The basic ignition timing is programmed
within the anti-knocking zone, if recommended fuel is used under dry conditions. The retard system does not
operate under normal driving conditions.
If engine knocking occurs, the knock sensor monitors the condition. The signal is transmitted to the ECM. The
ECM retards the ignition timing to eliminate the knocking condition.
ENGINE AND EMISSION BASIC CONTROL SYSTEM
DESCRIPTION
KA24DE (EURO OBD)
Distributor Ignition (DI) System
EC-3027

Air Conditioning Cut Control
DESCRIPTION=NEEC0016Input/Output Signal ChartNEEC0016S01
Sensor Input Signal to ECMECM func-
tionActuator
Air conditioner switch Air conditioner ªONº signal
Air condi-
tioner cut
controlAir conditioner relay Throttle position sensor Throttle valve opening angle
Camshaft position sensor Engine speed
Engine coolant temperature sensor Engine coolant temperature
Ignition switch Start signal
Vehicle speed sensor Vehicle speed
Power steering oil pressure switch Power steering operation
System DescriptionNEEC0016S02This system improves engine operation when the air conditioner is used.
Under the following conditions, the air conditioner is turned off.
+When the accelerator pedal is fully depressed.
+When cranking the engine.
+When the engine coolant temperature becomes excessively high.
+When operating power steering and air conditioner during low engine speed or when fully releasing accel-
erator pedal.
+When engine speed is excessively low.
Fuel Cut Control (at no load & high engine
speed)
DESCRIPTIONNEEC0017Input/Output Signal ChartNEEC0017S01
Sensor Input Signal to ECMECM func-
tionActuator
Vehicle speed sensor Vehicle speed
Fuel cut
controlInjectors PNP switch Neutral position
Throttle position sensor Throttle position
Camshaft position sensor Engine speed
If the engine speed is above 3,000 rpm with no load, (for example, in Neutral and engine speed over 3,000
rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies based on engine speed.
Fuel cut will operate until the engine speed reaches 1,500 rpm, then fuel cut is cancelled.
NOTE:
This function is different from deceleration control listed under ªMultiport Fuel Injection (MFI) Systemº,
EC-3024.
ENGINE AND EMISSION BASIC CONTROL SYSTEM
DESCRIPTION
KA24DE (EURO OBD)
Air Conditioning Cut Control
EC-3028

INSPECTION PROCEDURE=NEEC0028S02
1 INSPECTION START
1. Visually check the following:
+Air cleaner clogging
+Hoses and duct for leaks
+Electrical connectors
+Gasket (intake manifold, cylinder head, exhaust system)
+Throttle valve and throttle position sensor operation
2. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
Ensure engine speed stays below 1,000 rpm.
SEF810K
3. Open engine hood and run engine at about 2,000 rpm for about 2 minutes under no-load.
4. Make sure that no DTC is displayed with CONSULT-II or GST.
OK or NG
OK©+GO TO 2. (With CONSULT-II)
+GO TO 3. (Without CONSULT-II)
NG©1. Repair or replace components as necessary.
2. GO TO 2. (With CONSULT-II)
3. GO TO 3. (Without CONSULT-II)
BASIC SERVICE PROCEDUREKA24DE (EURO OBD)
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment
EC-3037

3 CHECK IGNITION TIMING
Without CONSULT-II
1. Run engine at about 2,000 rpm for about 2 minutes under no-load.
2. Rev engine two or three times under no-load, then run engine at idle speed for about 1 minute.
SEF978U
3. Turn off engine and disconnect throttle position sensor harness connector.
SEF265S
4. Start engine and rev it (2,000 to 3,000 rpm) two or three times under no-load, then run engine at idle speed.
5. Check ignition timing with a timing light.
SEF320V
M/T: 15ɱ2É BTDC
OK or NG
OK©GO TO 5.
NG©GO TO 4.
BASIC SERVICE PROCEDUREKA24DE (EURO OBD)
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment
EC-3039

4 ADJUST IGNITION TIMING
With CONSULT-II
1. Adjust ignition timing to the specified value by turning distributor after loosening bolts which secure distributor.
Without CONSULT-II
1. Adjust ignition timing to the specified value by turning distributor after loosening bolts which secure distributor.
2. Turn off engine and connect throttle position sensor harness connector to throttle position sensor.
SEF265S
Models with CONSULT-II©GO TO 2.
Models without CON-
SULT-II©GO TO 3.
5 CHECK BASE IDLE SPEED
With CONSULT-II
1. Read idle speed in ªIGNITION TIMING ADJº in ªWORK SUPPORTº mode.
SEF713Z
M/T: 650±50 rpm
Without CONSULT-II
1. Check idle speed.
M/T: 650±50 rpm
OK or NG
OK (With CONSULT-II)©GO TO 7.
OK (Without CONSULT-
II)©GO TO 8.
NG©GO TO 6.
BASIC SERVICE PROCEDUREKA24DE (EURO OBD)
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment
EC-3040

8 CHECK TARGET IDLE SPEED
Without CONSULT-II
1. Turn off engine and connect throttle position sensor harness connector.
SEF265S
2. Start engine.
3. Rev engine (2,000 to 3,000 rpm) two or three times under no-load, then run engine at idle speed.
4. Check target idle speed.
M/T: 700±50 rpm
OK or NG
OK©GO TO 10.
NG©GO TO 9.
9 DETECT MALFUNCTIONING PART
Check the following.
1. Check IACV-AAC valve and replace if necessary. Refer to EC-3295.
2. Check IACV-AAC valve harness and repair if necessary. Refer to EC-3295.
3. Check ECM function by substituting another known-good ECM.
(ECM may be the cause of a problem, but this is rarely the case.)
©GO TO 10.
BASIC SERVICE PROCEDUREKA24DE (EURO OBD)
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment
EC-3042

10 CHECK HEATED OXYGEN SENSOR 1 SIGNAL
With CONSULT-II
1. See ªHO2S1 MNTR (B1)º in ªDATA MONITORº mode.
2. Run engine at about 2,000 rpm for about 2 minutes under no-load.
3. Maintain engine at 2,000 rpm under no-load (engine is warmed up to normal operating temperature) and check that the
monitor fluctuates between ªLEANº and ªRICHº more than five times during 10 seconds.
SEF820Y
1 cycle: RICH®LEAN®RICH
2 cycles: RICH®LEAN®RICH®LEAN®RICH
Without CONSULT-II
1. Run engine at about 2,000 rpm for about 2 minutes under no-load.
2. Set voltmeter probe between ECM terminal 50 and ground.
3. Make sure that the voltage fluctuates between 0 - 0.3V and 0.6 - 1.0V more than 5 times during 10 seconds at 2,000
rpm.
1 time: 0 - 0.3V®0.6 - 1.0V®0 - 0.3V
2 times: 0 - 0.3V®0.6 - 1.0V®0 - 0.3V®0.6 - 1.0V®0 - 0.3V
OK or NG
OK©INSPECTION END
NG©GO TO 11.
BASIC SERVICE PROCEDUREKA24DE (EURO OBD)
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment
EC-3043

11 CHECK HEATED OXYGEN SENSOR 1 HARNESS
1. Turn off engine and disconnect battery ground cable.
2. Disconnect ECM harness connector.
3. Disconnect heated oxygen sensor 1 harness connector.
4. Then connect harness connector terminal for heated oxygen sensor 1 to ground with a jumper wire.
SEC299D
5. Check for continuity between terminal 50 of ECM harness connector and body ground.
SEF250P
Continuity exists...OK
Continuity does not exist...NG
OK or NG
OK©1. Connect ECM harness connector to ECM.
2. Connect battery ground cable.
3. GO TO 13.
NG©1. Repair or replace harness.
2. GO TO 12.
BASIC SERVICE PROCEDUREKA24DE (EURO OBD)
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment
EC-3044