NISSAN PRIMERA 1999 Electronic Repair Manual

YEC813
IGNITION SWITCH
ON or START
FUSE
BLOCK
(J/B)
Refer to EL-POWER.
: Detectable line for DTC
: Non-detectable line for DTC
AIR CONDITIONER
RELAY
To compressor
(Refer to HA-A/C.)
A/C
CONTROL
PANEL
LOWHIGH
NORMALTRIPLE-
PRESSURE
SWITCH
THERMISTORTHERMO
CONTROL
AMP.
ECM
REFER TO THE FOLLOWING
FUSE BLOCK - Junction Box (J/B)
FUSE BLOCK - Junction Box (J/B)
TROUBLE DIAGNOSES 15CD20T
Air Conditioner Cut Control (Cont'd)
EC-127

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

DIAGNOSTIC TROUBLE CONFIRMATION
PROCEDURE
1) Turn ignition switch to the ªONº position.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Wait at least 2 seconds.
TROUBLE DIAGNOSES 16CD20T
EGRC-Solenoid Valve (Cont'd)
EC-130

YEC814
BATTERY
Refer to EL-POWER.: Detectable line for DTC
: Non-detectable line for DTC
EGRC-
SOLENOID
VA LV E A ENGINE
CONTROL
MODULE
RELAY
ECM EGRC-
SOLENOID
VA LV E B
TROUBLE DIAGNOSES 16CD20T
EGRC-Solenoid Valve (Cont'd)
EC-131

DIAGNOSTIC PROCEDURE
INSPECTION START
(Circuit for EGRC-solenoid valve A)
CHECK MAIN POWER SUPPLY.
Refer to Trouble Diagnosis for main
power supply (EC-CD-59)
CHECK POWER SUPPLY.
1. Turn ignition switch to the ªLOCKº
position.
2. Disconnect EGRC-solenoid valve A
harness connector.
3. Turn ignition switch to the ªONº posi-
tion.
4. Check voltage between connector
terminal
p2and engine ground.
Voltage: Battery voltage
OK
ENG
Check the following:
lHarness continuity
between ECM relay
and EGRC-solenoid
valve A connector.
If NG, repair harness or
connectors.
CHECK OUTPUT SIGNAL CIRCUIT.
1. Turn ignition switch to the ªLOCKº
position.
2. Disconnect ECM harness connector.
3. Check harness continuity between
ECM harness connector terminal
208and EGRC solenoid valve A
connector terminal
p1.
Continuity should exist.
If OK, check harness for short-cir-
cuit.
OK
ENG
Check the following:
lHarness for open or
short-circuit between
ECM and solenoid
valve.
If NG, repair harness or
connectors.
CHECK COMPONENTS
(EGRC-solenoid valve).
Refer to ªCOMPONENT INSPECTIONº
EC-CD-135.
OK
ENG
Replace malfunctioning
component(s).
Disconnect and reconnect harness
connectors in the circuit. Then retest.
Trouble is not fixed
Check ECM pin terminals for damage
or the connection of ECM harness con-
nector. Reconnect ECM harness con-
nector and retest.
INSPECTION END
EGRC solenoid valve A
harness connector
NEF219A
EGRC solenoid
valve A harness
connector
NEF220A
H
H
H
H
H
H
H
TROUBLE DIAGNOSES 16CD20T
EGRC-Solenoid Valve (Cont'd)
EC-132

DIAGNOSTIC PROCEDURE
INSPECTION START
EGR CONTROL OPERATION
CHECK OVERALL FUNCTION.
1. Start engine and warm it up suffi-
ciently. (Air conditioner is ªOFFº).
2. Perform diagnostic test mode II
(Self-diagnostic results).
Make sure that diagnostic trouble
code No. 55 is displayed.
3. Make sure that EGR diaphragm
moves up and down (Use your finger
or a suitable tool) under the following
conditions:
At idle:
Spring does not move.
Racing engine from idle to 2800
rpm:
Spring moves up and down.
NG
EOK
INSPECTION END
CHECK VACUUM SOURCES TO EGR
VA LV E .
1. Disconnect vacuum hoses to EGR
valve.
2. Make sure that vacuum exists under
the following conditions:
At idle:
Vacuum should not exist.
Racing engine from idle to 2800
rpm:
Vacuum should exist.
NG
EOK
CHECK COMPONENTS
(EGR valve).
(See page EC-CD-135.)
NG
Replace malfunctioning
component(s).
pA
NEF433
EGR
valve
NEF434
EGR
valve
H
H
H
H
TROUBLE DIAGNOSES 16CD20T
EGRC-Solenoid Valve (Cont'd)
EC-133

pA
CHECK CONTROL FUNCTION.
1. Turn ignition switch to ªONº
position.
2. Turn EGRC-solenoid valve A
ªONº and ªOFFº in ªACTIVE
TESTº mode with CONSULT-II
and check operating sound.
----------------------------------------------------------------------------------------------------------------------------------------OR----------------------------------------------------------------------------------------------------------------------------------------
1. Check voltage between EGRC
solenoid valve A connector ter-
minal
p1, and ground with
tester under the following condi-
tions:
Voltage:
At idle
Battery voltage
Engine speed is 2,800 rpm
Approximately 0.4V
NG
EOK
CHECK VACUUM
HOSE.
Check vacuum hose
for clogging, cracks or
improper connection.
Perform electrical circuit inspection.
Refer to EC-CD-132.
OK
pB
C2ESA01
NEF435
NEF846
Crack
Clogging
Improper connection
.
NEF436
.EGRC-solenoid valve
harness connector
H
H
H
TROUBLE DIAGNOSES 16CD20T
EGRC-Solenoid Valve (Cont'd)
EC-134

COMPONENT INSPECTION
EGR valve
Apply vacuum to EGR vacuum port with a hand vacuum pump.
EGR valve spring should lift.
If NG, replace EGR valve.
EGRC-solenoid valve
Check air passage continuity.
ConditionAir passage
continuity
between
pAandpB
Air passage
continuity
between
pAandpC
12V direct current sup-
ply between terminals
p1andp2
Ye s N o
No supplyNo Yes
If NG, replace solenoid valve.
MEF137D EGR valve
MEC488B BATTERY FUSE
TROUBLE DIAGNOSES 16CD20T
EGRC-Solenoid Valve (Cont'd)
EC-135

Brake Switch
The ECM receives signals from two brake switches. One is a
conventional brake lamp switch, the other is referred to as a
redundant (RDNT) brake switch.
In case the accelerator pedal does not return to the idle position
(pedal sticks), the driver will react by depressing the brake. In
this (emergency) situation, the ECM will disregard the accelera-
tor pedal signal and bring back the engine speed to 1200 rpm.
Malfunction is detected when ...Check Items
(Possible Cause)
lBrake switch circuits are open or shorted.lHarness or connectors
(Brake switch circuits are open or shorted.)
lStop lamp switch
lRDNT brake switch
DIAGNOSTIC TROUBLE CONFIRMATION
PROCEDURE
1) Turn ignition switch to ªONº position and select ªDATA
MONITORº mode with CONSULT-II.
2) Depress brake pedal for at least 1 minute.
TROUBLE DIAGNOSES 17CD20T
EC-136