check engine NISSAN PRIMERA 1999 Electronic Repair Manual

Accelerator Position Sensor & Switch
The accelerator position sensor is installed on the upper end of
the accelerator pedal assembly. The sensor detects the accel-
erator position and sends a signal to the ECM. The ECM uses
the signal to determine the amount of fuel to be injected.
Malfunction is detected when ...Check Items
(Possible Cause)
lAn excessively low or high voltage from the sensor is
detected by the ECM.lHarness or connectors
(The sensor or switch circuit is open or shorted.)
lAccelerator position sensor
lAccelerator position switch
DIAGNOSTIC TROUBLE CONFIRMATION
PROCEDURE
1) Turn ignition switch to ªONº position.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Depress accelerator pedal fully and keep it for at least
1 second. Then release it and wait at least 5 seconds.
DIAGNOSTIC TROUBLE CONFIRMATION
PROCEDURE (For accelerator stiching)
1) Turn ignition switch to ªONº position.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Start engine and rev it up above 1,300 rpm.
4) Depress brake pedal immediately after releasing
accelerator pedal and keep it at least 5 seconds.
NEF822
Output voltage between terminal No. 4 and 5 (V)
Throttle valve opening angle (deg)
TROUBLE DIAGNOSIS 12CD20T
EC-108

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

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

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

Glow Control System
When coolant temperature is lower than 75ÉC (167ÉF):
lIgnition switch ON
After ignition switch has been turned to ON, the glow relay
turns ON for a period of time depending on engine coolant
temperature, allowing current to flow through the glow plugs.
lStarting
After starting the engine, current will flow through the glow
plugs for 300 seconds, or until the coolant temperature
exceeds 50ÉC (122ÉF).
COMPONENT DESCRIPTION
Glow plug
The glow plug is provided with a ceramic heating element to
obtain a high-temperature resistance. It glows in response to a
signal sent from the ECM, allowing current to flow through the
glow plug via the glow relay.
Malfunction is detected when ....Check Items
(Possible cause)
lGlow relay signal circuit is open or shorted.lHarness or connectors
(The glow relay signal circuit is open or shorted)
lGlow relay
lGlow indicator lamp circuit is open or shorted.lHarness or connectors
(The glow indicator lamp circuit is open or shorted.)
lGlow lamp
Glow lamp indicator
Time,[S]
.
Engine coolant temperature
Pre-glow
Time,[S]
Engine coolant temperature.
Post glow
.Time,[S]
Engine coolant temperature
.1.5
.(-40) (-4) (32) (68) (104) (140)
.(-40) (-4) (32) (68) (104) (140)
.(-40) (-4) (32) (68) (104) (140),ÉC (ÉF).,ÉC (ÉF)
.,ÉC (ÉF)
NEF834
.
.
SEF857S Ceramic heater
Resistor
TROUBLE DIAGNOSES 14CD20T
EC-118

INSPECTION START
(Glow plug circuit)
CHECK POWER SUPPLY-I.
1. Turn ignition switch to ªLOCKº posi-
tion.
2. Disconnect glow relay harness con-
nector.
3. Check voltage between glow relay
harness connector terminal
p5and
engine ground.
Voltage: Battery voltage
OK
ENG
Check the following:
lHarness for open or
short-circuit between
glow relay and battery.
l80A fusible link
If NG, replace fusible link
and repair harness con-
nectors.
CHECK POWER SUPPLY-II.
1. Disconnect glow plug harness con-
nector.
2. Check harness continuity between
glow plug harness connector and
glow relay harness connector termi-
nal
p3.
Continuity should exist.
If OK, check harness for short-cir-
cuit.
OK
ENG
Check the following:
lHarness connectors
E2,F46
lHarness for open or
short-circuit between
glow plug and glow
relay.
If NG, repair harness or
connector.
CHECK GLOW PLUG AND GLOW
RELAY.
Refer to ªCOMPONENT INSPECTIONº
(EC-CD-124, 125).
OK
ENG
Replace glow plug or
glow relay.
Disconnect and reconnect harness
connectors in the circuit. Then retest.
INSPECTION END
NEF873
Glow relay connector
YEC374
Glow relay
connectorGlow plug
connector
H
H
H
H
H
TROUBLE DIAGNOSES 14CD20T
Glow Control System (Cont'd)
EC-123

SYSTEM OPERATION CHECK
Set voltmeter between glow plug and engine body.
1. Pre-glow control system
a. Turn ignition switch to ªONº position.
b. Read voltage.
Voltage:
Battery voltage for an engine coolant temperature
dependent time.
* Repeatedly turning the ignition switch to ªONº
position and to ªLOCKº position may change
the pre-glow time.
2. After-glow system
Start engine and read voltage.
Voltage:
Battery voltage for 5* minutes
* Engine coolant temperature is lower than 50ÉC
(122ÉF).
COMPONENT INSPECTION
Glow relay
1. Check relay for coil continuity between glow relay terminals
p1andp2.
Continuity should exist.
2. Check relay for proper operation by applying 12V dc voltage
between glow relay terminals
p1andp2and checking con-
tinuity between terminals
p3andp5.
Coil voltage Continuityp3andp5Contact point
0VNo OFF
12VYe s O N
SEC554B Glow plug plate
NEF838
Pre-glow time
Engine coolant temperature
.(-4) (32) (68) (104)
NEF839 Engine coolant temperature
After glow time (sec.)
.(-4) (32) (68) (104)
SEC564B OhmmeterGlow relay
Contact point
12V dc
p2
p1
p3
p5
TROUBLE DIAGNOSES 14CD20T
Glow Control System (Cont'd)
EC-124

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

INSPECTION START
(Air conditioner relay signal circuit)
CHECK POWER SUPPLY.
1. Turn ignition switch to ªLOCKº posi-
tion.
2. Disconnect air conditioner relay har-
ness connector.
3. Turn ignition switch to ªONº position.
4. Check voltage between air condi-
tioner relay connector terminals
p2,
p5and engine ground.
Voltage: Battery voltage
OK
ENG
Check the following:
lHarness and connec-
tors for open or short-
circuit between ignition
switch and air condi-
tioner relay.
l10A fuse
If NG, replace or repair
the parts affected.
CHECK GROUND CIRCUIT.
1. Turn ignition switch to ªLOCKº posi-
tion.
2. Disconnect ECM harness connector.
3. Check harness continuity between
ECM harness connector terminal
204and air conditioner relay har-
ness connector terminal
p1.
Continuity should exist.
If OK, check harness for short-cir-
cuit.
OK
ENG
Check the following:
lHarness connectors
E43,F2
lHarness for open or
short-circuit between
ECM and air condi-
tioner relay.
If NG, repair harness or
connectors.
CHECK AIR CONDITIONER RELAY.
Refer to HA section for inspection.
OK
ENG
Replace air conditioner
relay.
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
YEC375 Air conditioner relay
harness connector
Air conditioner relay
harness connector
NEF218A
H
H
H
H
H
H
TROUBLE DIAGNOSES 15CD20T
Air Conditioner Cut Control (Cont'd)
EC-128

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