sensor NISSAN PRIMERA 1999 Electronic Repair Manual

YEC810 : Detectable line for DTC
: Non-detectable line for DTC
ACCELERATOR
WORK UNIT ECM
RELEASEDDEPRESSED
TROUBLE DIAGNOSIS 12CD20T
Accelerator Position Sensor & Switch
(Cont'd)
EC-110

DIAGNOSTIC PROCEDURE
INSPECTION START
(Accelerator position sensor)
CHECK POWER SUPPLY.
1. Turn ignition switch to ªLOCKº position.
2. Disconnect accelerator position sensor
harness connector.
3. Turn ignition switch to ªONº position.
4. Check voltage between accelerator posi-
tion sensor connector terminal
p5and
ground with CONSULT-II or voltage
tester.
Voltage: Approximately 5V
OK
ENG
Check the following:
lHarness connectorsM50,F104
lHarness for open or
short-circuit between
ECM and accelerator
position sensor.
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch to ªLOCKº position.
2. Check harness continuity between accel-
erator position sensor connector terminal
p4and engine ground.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG
Check the following:
lHarness connectorsM50,F104
lHarness for open or
short-circuit between
ECM and accelerator
position sensor.
If NG, repair harness or
connectors.
CHECK INPUT SIGNAL CIRCUIT.
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM
terminal
434and accelerator position
sensor connector terminal
p2.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG
Check the following
lHarness connectorsM50,F104
lHarness for open or
short-circuit between
ECM and accelerator
position sensor
If NG, repair harness or
connectors.
CHECK COMPONENT
(Accelerator position sensor).
Refer to ªCOMPONENT INSPECTIONº
EC-CD-113.
OK
ENG
Replace accelerator pedal
assembly.
Disconnect and reconnect harness connec-
tors in the circuit. Then retest.
Trouble is not fixed.
Check ECM pin terminals for damage and
check the connection of ECM harness con-
nector. Reconnect ECM harness connector
and retest.
INSPECTION END
NEF823
Accelerator position
sensor harness con-
nector Accelerator
pedal
NEF824
Accelerator position
sensor connector
NEF825 Accelerator position
sensor connector
NEF209A
Accelerator position
sensor connector
H
H
H
H
H
H
H
TROUBLE DIAGNOSIS 12CD20T
Accelerator Position Sensor & Switch
(Cont'd)
EC-111

DIAGNOSTIC PROCEDURE
INSPECTION START
(Accelerator position switch)
CHECK OVERALL FUNCTION.1. Turn ignition switch to ªONº
position.
2. Check ªOFF ACCEL POSº in
ªDATA MONITORº mode with
CONSULT-II.
Accelerator pedal released:
ON
Accelerator pedal depressed:
OFF
-------------------------------------------------------------------------------------------------------------------------------OR-------------------------------------------------------------------------------------------------------------------------------
1. Turn ignition switch to ªLOCKº
position.
2. Check continuity between ECM
connector terminal
435and
ground.
Continuity:
Accelerator pedal released:
No
Accelerator pedal depressed:
Ye s
NG
EOK
INSPECTION END
CHECK GROUND CIRCUIT.
1. Disconnect accelerator switch harness
connector.
2. Check harness continuity between
accelerator switch connector terminal
p1and ECM connector terminal426.
Continuity should exist.
OK
ENG
Check the following:
lHarness connectorsM52,F103lHarness for open circuit
between accelerator switch
and ECM connector termi-
nal
426.
If NG, repair harness or con-
nectors.
CHECK INPUT SIGNAL CIRCUIT.
Check harness continuity between ECM
connector terminal
435and accelerator
switch connector terminal
p3.
Continuity should exist.
OK
ENG
Check the following:
lHarness connectorsF103,M52lHarness for open or short-
circuit between accelerator
switch and ECM
CHECK COMPONENT
(Accelerator switch).
Refer to ªCOMPONENT INSPECTIONº
on next page.
OK
ENG
Replace accelerator switch.
Disconnect and reconnect harness connec-
tors in the circuit. Then retest.
Trouble is not fixed
Check ECM pin terminals for damage and
check the connection of ECM harness con-
nector. Reconnect ECM harness connector
and retest.
INSPECTION END
PEF123W
NEF210A
NEF212A
Accelerator
switch con-
nector
NEF211A
Accelerator
switch connector
H
H
H
H
H
H
H
TROUBLE DIAGNOSIS 12CD20T
Accelerator Position Sensor & Switch
(Cont'd)
EC-112

COMPONENT INSPECTION
Accelerator position sensor
1. Disconnect accelerator position sensor harness connector.
2. Make sure that resistance between accelerator position sen-
sor terminals
p2andp4changes when opening throttle
valve manually.
Throttle valve conditions Resistance [at 25ÉC (77ÉF)]
Completely closedApproximately 1.2 kW
Partially open1.2 - 1.9 kW
Completely openApproximately 1.9 kW
If NG, replace accelerator pedal assembly.
CAUTION:
lDo not disassemble accelerator pedal assembly.
COMPONENT INSPECTION
Accelerator switch
1. Disconnect accelerator switch harness connector.
2. Check continuity between accelerator switch connector ter-
minals
p1andp3.
Conditions Continuity
Accelerator pedal releasedNo
Accelerator pedal depressedYe s
If NG, replace accelerator pedal assembly.
CAUTION:
lDo not disassemble accelerator pedal assembly.
1
25 4 3M68
24
YEC368 Accelerator position
sensor connector
M68
1
25 4 3M68
13
YEC369 Accelerator position
sensor connector
M68
TROUBLE DIAGNOSIS 12CD20T
Accelerator Position Sensor & Switch
(Cont'd)
EC-113

Crankshaft Position Sensor (TDC)
The crankshaft position sensor (TDC) monitors engine speed by
means of signals from the sensing plate (with two protrusions)
installed to the crankshaft pulley. The datum signal output is
detected at ATDC 70É and sent to the ECM. The sensor signal
is used for fuel injection control and fuel injection timing control.
Malfunction is detected when ....Check Items
(Possible Cause)
lAn incorrect signal from the sensor is detected by ECM
during engine running and cranking.lHarness or connectors
(The sensor circuit is open.)
lCrankshaft position sensor (TDC)
DIAGNOSTIC TROUBLE CONFIRMATION
PROCEDURE
Before performing the following procedure, confirm
that battery voltage is more than 9V.
1) Turn ignition switch to ªONº position and select
ªDATA MONITORº mode with CONSULT-II.
2) Start engine and run it for at least 3 seconds above
1,200 rpm.
SEF615S Core
Magnet
Coil
SEF616S Crank pulley
Crankshaft position
sensor (TDC)
TROUBLE DIAGNOSIS 13CD20E
EC-114

YEC811
CRANKSHAFT POSI-
TION SENSOR (TDC)
: Detectable line for DTC
: Non-detectable line for DTC
ECM
TROUBLE DIAGNOSIS 13CD20E
Crankshaft Position Sensor (TDC) (Cont'd)
EC-115

DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK INPUT SIGNAL CIRCUIT.
1. Turn ignition switch to ªLOCKº posi-
tion.
2. Disconnect crankshaft position sen-
sor (TDC) and ECM harness con-
nectors.
3. Check continuity between ECM ter-
minal
344and crankshaft position
sensor (TDC) connector terminal
p3.
Continuity should exist.
If OK, check harness for short-cir-
cuit.
OK
ENG
Repair harness or con-
nectors.
Loosen and retighten engine ground
screws.
OK
CHECK GROUND CIRCUIT.
Check harness continuity between
crankshaft position sensor (TDC) con-
nector terminal
p2and ECM connec-
tor terminal
331.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG
Repair harness or con-
nectors.
CHECK COMPONENT
[Crankshaft position sensor (TDC)].
Refer to ªCOMPONENT INSPECTIONº
on next page.
OK
ENG
Replace crankshaft posi-
tion sensor (TDC).
Disconnect and reconnect harness
connectors in the circuit. Then retest.
Trouble is not fixed
Check ECM pin terminals for damage
and check the connection of ECM har-
ness connector. Reconnect ECM har-
ness connector and retest.
INSPECTION END
SEF617S Crankshaft position
sensor (TDC)
harness connector
NEF213A
Crankshaft position
harness connector
NEF214A
Crankshaft position
sensor connector
H
H
H
H
H
H
H
TROUBLE DIAGNOSIS 13CD20E
Crankshaft Position Sensor (TDC) (Cont'd)
EC-116

COMPONENT INSPECTION
Crankshaft position sensor (TDC)
1. Disconnect crankshaft position sensor (TDC) harness con-
nector.
2. Loosen the fixing bolt of the sensor.
3. Remove the sensor.
4. Visually check the sensor for chipping.
5. Check resistance between crankshaft position sensor (TDC)
terminals
p2andp3.
Resistance: Approximately 1.2 - 1.5kW
[at 25ÉC (77ÉF)]
If NG, replace crankshaft position sensor (TDC).
SEF620S
NEF440 Crankshaft position
sensor (TDC) con-
nector
TROUBLE DIAGNOSIS 13CD20E
Crankshaft Position Sensor (TDC) (Cont'd)
EC-117

Air Conditioner Cut Control
The Air Conditioner relay is controlled by the ECM. During the
following conditions, the ECM will cut the power supply towards
the air conditioner relay:
lStarting engine
lQuick acceleration from low speed
lUndershooting of idle speed
lHigh engine coolant temperature [above 107ÉC (225ÉF)].
lMalfunctioning of engine speed sensor, accelerator position
sensor or vehicle speed sensor when engine speed is below
2,100 rpm.
Malfunction is detected when ....Check Items
(Possible cause)
lAir conditioner relay signal circuit is shorted.lHarness or connectors
(The air conditioner relay signal circuit is shorted).
lAir conditioner relay
DIAGNOSTIC TROUBLE CONFIRMATION
PROCEDURE
1) Turn ignition switch and air conditioner switch to the
ªONº position.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Wait at least 2 seconds.
TROUBLE DIAGNOSES 15CD20T
EC-126

EGRC-Solenoid Valve
SYSTEM DESCRIPTION
Camshaft position sensor (TDC)EEngine speed
ECM
Air conditioner switchEAir conditioner ªONº signalEEGRC-solenoid valve
Engine coolant temperature sensorEEngine coolant temperature
Atmospheric pressure sensor
EAtmospheric pressure
Mass air flow sensor
EMass air flow
The ECM receives signals sent from the engine coolant tempera-
ture sensor, crankshaft position sensor (TDC), atmospheric pres-
sure sensor, mass air flow sensor and air conditioner switch to
determine engine speed and operating conditions. Based on
these signals, the ECM controls the EGR control solenoid valve
operation.
No EGR operation will take place when the engine coolant tem-
perature is below 70ÉC (158ÉF), when idling, at starting and dur-
ing a period of time after starting the engine (70 - 200 seconds,
depending on engine coolant temperature).
Engine coolant
temperature ÉC (ÉF)Load EGRC-solenoid valve EGR valve Amount of EGR gas
Below 70 (158) AnyOFF
(Closed)Fully closed Ð
Above 70 (158)Low loadON
(Open)Fully open Large
High loadOFF
(Closed)Fully closed Ð
COMPONENT DESCRIPTION
The EGR control solenoid valves control vacuum pressure act-
ing on the EGR valve. The EGR control valve will then be fully
opened or fully closed, as required.
Thus, intake air passages are opened or closed in relation to
exhaust gas and intake air. Utilizing the relationship between
exhaust gas pressure and intake air pressure control, the amount
of EGR (exhaust gas recirculated) is regulated in large or small
volumes.
Malfunction is detected when ....Check Items
(Possible cause)
lEGRC-solenoid valve A circuit is shorted.lHarness or connectors
(EGRC-solenoid valve A circuit is open or shorted).
lEGRC solenoid valve A
SEF240PH To control valve
To intake
air flow
Vacuum
signal
TROUBLE DIAGNOSES 16CD20T
EC-129