NISSAN PRIMERA 1999 Electronic Repair Manual

CONSULT-II
CONSULT-II INSPECTION PROCEDURE
1. Turn off ignition switch.
2. Connect ªCONSULT-IIº to data link connector for CONSULT-
II.
(Data link connector for CONSULT-II is located behind the
fuse box cover.)
3. Turn on ignition switch.
4. Touch ªSTARTº.
5. Touch ªENGINEº.
6. Perform each diagnostic test mode according to each service
procedure.
For further information, see the CONSULT-II Operation
Manual.
NEF225A Fuse box
Data link connector
for CONSULT-II
PEF895K
PEF216U
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONCD20T
EC-27

ENGINE CONTROL MODULE COMPONENT PARTS/CONTROL SYSTEMS APPLICATION
ItemDIAGNOSTIC TEST MODE
SELF-DIAG-
NOSTIC
RESULTSD ATA
MONITORACTIVE
TEST
ENGINE CONTROL MODULE COMPONENT PARTS
INPUTCamshaft position sensor (PUMP) *1 X *2 X
Mass air flow sensor X X
Engine coolant temperature sensor X X
Control sleeve position sensor X X X
Fuel temperature sensor X X
Vehicle speed sensor or ABS actuator and electric unit
(control unit)XX
Accelerator position sensor X X
Accelerator position switch X
Brake lamp switch X *2 X
Crankshaft position sensor (TDC) X X
Needle lift sensor X X
Ignition switch (start signal) X
Ignition switch (ON signal) X
Air conditioner switch X
Brake switch X
Battery voltage X
OUTPUTInjection timing control valve X X X
Fuel cut solenoid valve X X X
Air conditioner relay X
Glow relay X X
EGRC-solenoid valve X X
Cooling fan relay X X
X: Applicable
*1: Imaginary sensor, which produces secondary engine revolution signal using needle lift sensor pulse.
*2: CONSULT-II may not display, but self-diagnostic results are available with MI.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONCD20T
CONSULT-II (Cont'd)
EC-28

SELF-DIAGNOSTIC MODE
Regarding items detected in ªSELF-DIAG RESULTSº mode, refer to ªDiagnostic Trouble chartº.
DATA MONITOR MODE
Monitored item
[Unit]ECM
input
signalsMain
signalsDescription Remarks
CKPS×RPM
(TDC) [rpm]
qq
lThe engine speed computed from the
crankshaft position sensor (TDC) sig-
nal is displayed.
CMPS×RPM -
PUMP [rpm]
qq
lThe engine speed computed from the
camshaft position sensor (PUMP) sig-
nal is displayed.
COOLAN TEMP/S
[ÉC] or [ÉF]
qq
lThe engine coolant temperature (deter-
mined by the signal voltage of the
engine coolant temperature sensor) is
displayed.lWhen the engine coolant temperature
sensor is open or short-circuited, ECM
enters fail-safe mode. The engine cool-
ant temperature determined by the
ECM is displayed.
VHCL SPEED SE
[km/h] or [mph]
qq
lThe vehicle speed computed from the
vehicle speed sensor signal or ABS
actuator and electric unit (control unit)
signal is displayed.
FUEL TEMP SEN
[ÉC] or [ÉF]
qq
lThe fuel temperature (determined by
the signal voltage of the fuel tempera-
ture sensor) is displayed.
ACCEL POS SEN
[V]
qqlThe accelerator position sensor signal
voltage is displayed.
OFF ACCEL POS
[ON/OFF]
qqlIndicates [ON/OFF] condition from the
accelerator position switch signal.
C/SLEEV POS/S [V]
qqlThe control sleeve position sensor sig-
nal voltage is displayed.
BATTERY VOLT [V]
qqlThe power supply voltage of ECM is
displayed.
START SIGNAL
[ON/OFF]
qqlIndicates [ON/OFF] condition from the
starter signal.lAfter starting the engine, [OFF] is dis-
played regardless of the starter signal.
AIR COND SIG
[ON/OFF]
qq
lIndicates [ON/OFF] condition of the air
conditioner switch as determined by
the air conditioner signal.
BRAKE SW
[ON/OFF]
qlIndicates [ON/OFF] condition of the
stio lamp switch.
BRAKE SW2
[ON/OFF]
qlIndicates [ON/OFF] condition of the
stio lamp switch 2.
IGN SW
[ON/OFF]
qqlIndicates [ON/OFF] condition from igni-
tion switch.
MAS AIR/FL SE [V]
qqlThe signal voltage of the mass air flow
sensor is displayed.lWhen the engine is stopped, a certain
value is indicated.
ACT INJ TIMG [É]
q
lThe actual injection timing angle deter-
mined by the ECM (an approximate
average angle between injection start
and end from TDC) is displayed.
TARGET F/INJ
[mm
3/STROKE]q
lThe target fuel injection quantity
(determined by the ECM according to
the input signal) is indicated.
NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONCD20T
CONSULT-II (Cont'd)
EC-29

Monitored item
[Unit]ECM
input
signalsMain
signalsDescription Remarks
FUEL CUT S/V
[ON/OFF]
lThe control condition of the fuel cut
solenoid valve (determined by ECM
according to the input signal) is indi-
cated.
lOFF ... Fuel cut solenoid valve is not
operating.
ON ... Fuel cut solenoid valve is oper-
ating.
lWhen the fuel cut solenoid valve is not
operating, fuel supply is shut off.
AIR COND RLY
[ON/OFF]
q
lThe air conditioner relay control condi-
tion (determined by ECM according to
the input signal) is indicated.
GLOW RLY
[ON/OFF]
q
lThe glow relay control condition (deter-
mined by ECM according to the input
signal) is displayed.
COOLING FAN
[LOW/HI/OFF]
q
lIndicates the control condition of the
cooling fans (determined by ECM
according to the input signal).
lLOW ... Operates at low speed.
HI ... Operates at high speed.
OFF ... Stopped.
EGRC SOL/V A
[ON/OFF]
lThe control condition of the EGRC-
solenoid valve (determined by ECM
according to the input signal) is indi-
cated.
lOFF ... EGRC-solenoid valve is not
operating.
ON ... EGRC-solenoid valve is oper-
ating.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONCD20T
CONSULT-II (Cont'd)
EC-30

ACTIVE TEST MODE
TEST ITEM CONDITION JUDGEMENT CHECK ITEM (REMEDY)
TARGET F/INJ
lEngine: Return to the original
trouble condition
lFix the target injection quantity
using CONSULT-II.If trouble symptom disappears, see
CHECK ITEM.lControl sleeve position sensor
COOLING FAN
lIgnition switch: ONlOperate the cooling fan at ªLOWº,
ªHIº speed and turn ªOFFº using
CONSULT-II.Cooling fan moves at ªLOWº, ªHIº
speed and stops.lHarness and connectorlCooling fan motor
FUEL CUT SOL/V
lIgnition switch: ONlTurn solenoid valve ªONº and
ªOFFº with the CONSULT-II and
listen to operating sound.Solenoid valve makes an operating
sound.lHarness and connectorlSolenoid valve
EGRC SOL/V A
lIgnition switch: ONlTurn solenoid valve ªONº and
ªOFFº with the CONSULT-II and
listen to operating sound.Solenoid valve makes an operating
sound.lHarness and connectorlSolenoid valve
GLOW RLY
lIgnition switch: ON (Engine
stopped)
lTurn the glow relay ªONº and
ªOFFº using CONSULT-II and listen
to operating sound.Glow relay makes the operating
sound.lHarness and connectorlFuel pump relay
INJ TIMING
lEngine: Return to the original
trouble condition
lRetard the injection timing using
CONSULT-II.If trouble symptom disappears, see
CHECK ITEM.lAdjust initial injection timing
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONCD20T
CONSULT-II (Cont'd)
EC-31

REAL TIME DIAGNOSIS IN DATA MONITOR MODE
CONSULT-II has two kinds of triggers and they can be selected by touching ªSETTINGº in ªDATA MONI-
TORº mode.
1. ªAUTO TRIGº (Automatic trigger):
lThe malfunction will be identified on the CONSULT-II screen in real time.
In other words, DTC and malfunction item will be displayed at the moment the malfunction is detected
by ECM.
DATA MONITOR can be performed continuously until a malfunction is detected. However, DATA
MONITOR cannot continue any longer after the malfunction detection.
2. ªMANU TRIGº (Manual trigger):
lMalfunction item will not be displayed automatically on CONSULT-II screen even though a malfunc-
tion is detected by ECM.
DATA MONITOR can be performed continuously even though a malfunction is detected.
Use these triggers as follows:
1. ªAUTO TRIGº
lWhile trying to detect the malfunction item by performing the ªDIAGNOSTIC TROUBLE CONFIR-
MATION PROCEDUREº, be sure to select to ªDATA MONITOR (AUTO TRIG)º mode. You can con-
firm the malfunction at the moment it is detected.
lWhile narrowing down the possible causes, CONSULT-II should be set in ªDATA MONITOR (AUTO
TRIG)º mode, especially in case the incident is intermittent.
Inspect the circuit by gently shaking (or twisting) suspicious connectors, components and harness in
the ªDIAGNOSTIC TROUBLE CONFIRMATION PROCEDUREº. The moment a malfunction is found
the malfunction item will be displayed. (Refer to GI section, ªIncident Simulation Testsº in ªHOW TO
PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENTº.)
2. ªMANU TRIGº
lIf the malfunction is displayed as soon as ªDATA MONITORº is selected, reset CONSULT-II to ªMANU
TRIGº. By selecting ªMANU TRIGº you can monitor and store the data. The data can be utilized for
further diagnosis, such as a comparison with the value for the normal operating condition.
PEF529Q ªSETTINGº ªAUTO TRIGº
A malfunction can be
displayed on ªDATA
MONITORº screen
automatically if detected.ªMANU TRIGº
A malfunction can not be
displayed on ªDATA
MONITORº screen
automatically even if
detected.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONCD20T
CONSULT-II (Cont'd)
EC-32

Introduction
The engine has an ECM to control major systems such as fuel
injection control, fuel injection timing control, glow control
system, etc. The ECM accepts input signals from sensors and
instantly drive the electronic fuel injection pump use the data to
based on current ambient conditions. It is essential that both
input and output signals are correct and stable. At the same time,
it is important that there are no problems such as vacuum leaks,
or other problems with the engine.
It is much more difficult to diagnose a problem that occurs inter-
mittently rather than catastrophically. Most intermittent problems
are caused by poor electric connections or faulty wiring. In this
case, careful checking of suspected circuits may help prevent the
replacement of good parts.
A visual check only may not be sufficient to determine the cause
of the problems. A road test with CONSULT-II or a circuit tester
connected should be performed. Follow the ªWork Flowº on the
next page.
Before undertaking actual checks, take a few minutes to talk with
a customer who approaches with a driveability complaint. The
customer can supply good information about such problems,
especially intermittent ones. Find out what symptoms are present
and under what conditions they occur. A ªDiagnostic Worksheetº
like the example on next page should be used.
Start your diagnosis by looking for ªconventionalº problems first.
This will help troubleshoot driveability problems on a vehicle with
an electronically controlled engine.
SEF858S
SEF233G
SEF234G
TROUBLE DIAGNOSIS Ð IntroductionCD20T
EC-33

Diagnostic Worksheet
There are many operating conditions that lead to the malfunction
of engine components. A good grasp of such conditions can
make troubleshooting faster and more accurate.
In general, each customer feels differently about a problem. It is
important to fully understand the symptoms or conditions for a
customer complaint.
Utilize a diagnostic worksheet like the one shown below in order
to organize all the information for troubleshooting.
WORKSHEET SAMPLE
Customer name MR/MS Model & Year VIN
Engine # Trans. Mileage
Incident Date Manuf. Date In Service Date
SymptomslStartabilitylImpossible to startlNo combustionlPartial combustion
lPartial combustion when warming-up engine
lPartial combustion when cooling down engine
lPossible but hard to startlOthers
[]
lIdlinglNo fast idlelUnstablelHigh idlelLow idle
lOthers [ ]
lDriveabilitylStumblelSurgelKnocklLack of power
lOthers [ ]
lEngine stalllAt the time of startlWhile idling
lWhile acceleratinglWhile decelerating
lJust after stoppinglWhile loading
Incident occurrencelJust after deliverylRecently
lIn the morninglAt nightlIn the daytime
FrequencylAll the timelUnder certain conditionslSometimes
Weather conditionslNot affected
WeatherlFinelRaininglSnowinglOthers
[]
TemperaturelHotlWarmlCoollColdlHumid ÉF
Engine conditionslColdlDuring warm-uplAfter warm-up
Engine speed
0 2,000 4,000 6,000 8,000 rpm
Road conditionslIn townlIn suburbslHighwaylOff road (up/down)
Driving conditionslNot affected
lAt startinglWhile idlinglAt racing
lWhile acceleratinglWhile cruising
lWhile deceleratinglWhile turning (RH/LH)
Vehicle speed
0 102030405060708090100mph
Malfunction indicatorlTurned onlNot turned on
SEF907L
KEY POINTS
WHAT..... Vehicle & engine model
WHEN..... Date, Frequencies
WHERE..... Road conditions
HOW..... Operating conditions,
Weather conditions,
Symptoms
TROUBLE DIAGNOSIS Ð IntroductionCD20T
EC-34

Work Flow
CHECK IN
Listen to customer complaints. (Get symptoms.)..........................................
STEP I
Check, print out or write down, and erase Diagnostic Trouble (malfunction item).
.....................................
STEP II
Symptoms
collected.No symptoms, except MI
lights up, or Malfunction
Code exists at STEP II.
Verify the symptom by driving in the condition the
customer described.
H
*1
....................................................................................
STEP III
Normal Code
(at STEP II)
Malfunction Code
(at STEP II)
Verify the malfunction item by performing the ªDIAGNOSTIC TROUBLE CON-
FIRMATION PROCEDUREº.
*1
.....................................
STEP IV
EChoose the appropriate action.
Malfunction Code (at STEP II or IV) Normal Code (at both STEP II and IV)
.....................................
*2STEP V
BASIC INSPECTION
SYMPTOM BASIS (at STEP I or III)
...........................................................
E
Perform inspections
according to Symptom
Matrix Chart.
H
TROUBLE DIAGNOSIS FOR SPECIFIC MAL-
FUNCTION ITEM.STEP VI
REPAIR/REPLACE
NGFINAL CHECK
Confirm that the incident is completely fixed by performing BASIC INSPECTION
and DIAGNOSTIC TROUBLE CONFIRMATION PROCEDURE (or OVERALL
FUNCTION CHECK). Then, erase the unnecessary (already fixed) Malfunction
Item in ECM.
OK.....................................
STEP VII
CHECK OUT
*1: If the incident cannot be duplicated, refer to GI section (ªIncident Simulation Testsº, ªHOW TO PERFORM EFFICIENT
DIAGNOSIS FOR AN ELECTRICAL INCIDENTº).
*2: If the on board diagnostic system cannot be performed, check main power supply and ground circuit. Refer to
ªTROUBLE DIAGNOSIS FOR MAIN POWER SUPPLY AND GROUND CIRCUITº, EC-CD-59.
H
H
H
H
H
H
H
H
H
H
H
TROUBLE DIAGNOSIS Ð Work FlowCD20T
EC-35

Description for Work Flow
STEP DESCRIPTION
STEP IGet detailed information about the conditions and the environment when the incident/symptom occurred
using the ªDIAGNOSTIC WORKSHEETº as shown on the previous page.
STEP IIBefore confirming the concern, check and write down (print out using CONSULT-II) the malfunction item,
then erase the code. The malfunction item can be used when duplicating the incident at STEP III & IV.
Study the relationship between the cause, specified by malfunction item, and the symptom described by the
customer. (The ªSymptom Matrix Chartº will be useful. Refer to EC-CD-47.)
STEP IIITry to confirm the symptom and under what conditions the incident occurs.
The ªDIAGNOSTIC WORK SHEETº is useful to verify the incident. Connect CONSULT-II to the vehicle in
DATA MONITOR (AUTO TRIG) mode and check real time diagnosis results.
If the incident cannot be verified, perform INCIDENT SIMULATION TESTS. Refer to GI section.
If the malfunction code is detected, skip STEP IV and perform STEP V.
STEP IVTry to detect the malfunction item by driving in (or performing) the ªDIAGNOSTIC TROUBLE CONFIRMA-
TION PROCEDUREº. Check and read the malfunction item by using CONSULT-II.
During the malfunction item verification, be sure to connect CONSULT-II to the vehicle in DATA MONITOR
(AUTO TRIG) mode and check real time diagnosis results.
If the incident cannot be verified, perform INCIDENT SIMULATION TESTS. Refer to GI section.
In case the ªDIAGNOSTIC TROUBLE CONFIRMATION PROCEDUREº is not available, perform the ªOVER-
ALL FUNCTION CHECKº instead. The malfunction item cannot be displayed by this check, however, this
simplified ªcheckº is an effective alternative.
The ªNGº result of the ªOVERALL FUNCTION CHECKº is the same as the DTC detection.
STEP VTake the appropriate action based on the results of STEP I through IV.
If the malfunction code is indicated, proceed to specific TROUBLE DIAGNOSIS for the malfunction item.
If the normal code is indicated, proceed to the BASIC INSPECTION. Refer to EC-CD-37. Then perform
inspections according to the Symptom Matrix Chart. Refer to EC-CD-47.
STEP VIIdentify where to begin diagnosis based on the relationship study between symptom and possible causes.
Inspect the system for mechanical binding, loose connectors or wiring damage using (tracing) ªHarness Lay-
outsº.
Gently shake the related connectors, components or wiring harness with CONSULT-II set in ªDATA MONI-
TOR (AUTO TRIG)º mode.
Check the voltage of the related ECM terminals or monitor the output data from the related sensors with
CONSULT-II. Refer to EC-CD-52.
The ªDIAGNOSTIC PROCEDUREº in EC section contains a description based on open circuit inspection. A
short circuit inspection is also required for the circuit check in the DIAGNOSTIC PROCEDURE. For details,
refer to GI section (ªCircuit Inspectionº, ªHOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRI-
CAL INCIDENTº).
Repair or replace the malfunctioning parts.
STEP VIIOnce you have repaired the circuit or replaced a component, you need to run the engine in the same condi-
tions and circumstances which resulted in the customer's initial complaint.
Perform the ªDIAGNOSTIC TROUBLE CONFIRMATION PROCEDUREº and confirm the normal code is
detected. If the incident is still detected in the final check, perform STEP VI by using a different method from
the previous one.
Before returning the vehicle to the customer, be sure to erase the unnecessary (already fixed) malfunction
item in ECM.
TROUBLE DIAGNOSIS Ð Work FlowCD20T
EC-36