engine NISSAN PRIMERA 1999 Electronic Workshop Manual

4 CHECK THROTTLE POSITION SWITCH CIRCUIT (With CONSULT-II)
With CONSULT-II
1. Turn ignition switch to ªONº position.
(Do not start engine.)
2. Select ªECU INPUT SIGNALSº in ªDATA MONITORº mode for ªCVTº with CONSULT-II.
3. Read out ªCLOSED THL/SWº and ªW/O THRL/P-SWº depressing and releasing accelerator pedal.
Check the signal of throttle position switch is indicated properly.
OK or NG
OK©GO TO 6.
NG©Check the following items:
IThrottle position switch Ð Refer to ªComponents Inspectionº, AT-85.
IHarness for short or open between ignition switch and throttle position switch (Main
harness)
IHarness for short or open between throttle position switch and TCM (Main harness)
Accelerator pedal
conditionData monitor
CLOSED THL/SW W/O THRL/P-SW
ReleasedON OFF
Fully depressedOFF ON
MTLB0011
DTC P1705 THROTTLE POSITION SENSOR
Diagnostic Procedure (Cont'd)
AT-83

5 CHECK THROTTLE POSITION SWITCH CIRCUIT (Without CONSULT-II)
Without CONSULT-II
1. Turn ignition switch to ªONº position.
(Do not start engine.)
2. Check voltage between TCM terminals 16, 17 and ground while depressing, and releasing accelerator pedal slowly. (After warming up
engine)
SAT454J
OK or NG
OK©GO TO 6.
NG©Check the following items:
IThrottle position switch Ð Refer to ªComponents Inspectionº, AT-85.
IHarness for short or open between ignition switch and throttle position switch (Main
harness)
IHarness for short or open between throttle position switch and TCM (Main harness)
Accelerator pedal
conditionVoltage
Terminal No. 16 Terminal No. 17
ReleasedBattery voltage 1V or less
Fully depressed1V or less Battery voltage
MTBL0137
6 CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-80.
OK or NG
OK©INSPECTION END
NG©1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-
nector.
DTC P1705 THROTTLE POSITION SENSOR
Diagnostic Procedure (Cont'd)
AT-84

DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NCAT0224S04CAUTION:
IAlways drive vehicle at a safe speed.
IBe careful not to rev engine into the red zone on the
tachometer.
NOTE:
If ªDIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DUREº has been previously conducted, always turn ignition
switch ªOFFº and wait at least 5 seconds before conducting
the next test.
After the repair, perform the following procedure to confirm the
malfunction is eliminated.
With CONSULT-II
1) Turn ignition switch ªONº and select ªDATA MONITORº mode
for ªENGINEº with CONSULT-II.
2) Drive vehicle for at least 5 consecutive seconds.
If the check result is ªNGº, go to ªDiagnostic Procedureº,
AT-89.
With GST
Follow the procedure ªWith CONSULT-IIº.
SAT651J
SAT654J
DTC P1777 STEP MOTOR Ð CIRCUIT
Description (Cont'd)
AT-87

DescriptionNCAT0228IThe step motor is ON/OFF of 4 aspects changes according to
the signal from TCM.
As a result, the flow of line pressure to primary pulley is
changed and pulley ratio is controlled.
IThis diagnosis item detects when electrical system is OK but,
mechanical system is NG.
IThis diagnosis item detects when the state that the changing
the speed mechanism in unit does not operate normally.
CONSULT-II REFERENCE VALUE IN DATA MONITOR
MODE
NCAT0228S01It is monitoring whether ªCVT RATIO: 2.32 - 0.47º changes similarly
to ªPLY CONT STEP: 3 - 200º by DATA MONITOR mode.
ON BOARD DIAGNOSIS LOGICNCAT0228S03
Diagnostic trouble code Malfunction is detected when ... Check items (Possible cause)
: STEP MOTOR/FNCTN
When not changing the speed according
to the instruction of TCM.IStep motor
: P1778
: MI Code No. 1778
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NCAT0228S04CAUTION:
IAlways drive vehicle at a safe speed.
IBe careful not to rev engine into the red zone on the
tachometer.
IBefore start ªDIAGNOSTIC TROUBLE CODE (DTC) CON-
FIRMATION PROCEDUREº, confirm ªHiº or ªMidº or
ªLowº fixation by ªI/P PULLY SPDº and ªVHCL SPEED SEº
on ªDATA MONITOR MODEº.
IIf hi-geared fixation, go to diagnostic procedure soon.
NOTE:
If ªDIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DUREº has been previously conducted, always turn ignition
switch ªOFFº and wait at least 5 seconds before conducting
the next test.
After the repair, perform the following procedure to confirm the
malfunction is eliminated.
With CONSULT-II
1) Turn ignition switch ªONº and select ªDATA MONITORº mode
for ªCVTº with CONSULT-II.
SAT651J
SAT971J
DTC P1778 STEP MOTOR Ð FUNCTION
Description
AT-91

2) Make sure that output voltage of CVT fluid temperature sne-
sor is within the range below.
FLUID TEMP SEN: 0.5 - 1.5V
If out of range, drive the vehicle to decrease the voltage
(warm up the fluid) or stop engine to increase the voltage
(cool down the fluid)
3) Select ªENGINEº mode for ªENGINEº with CONSULT-II.
4) Start engine and maintain the following conditions for at least
30 consecutive seconds.
TEST START FROM 0 km/h (0 MPH)
CONSTANT ACCELERATION: Keep 30 sec or more
VHCL SPEED SE: 10 km/h (6 MPH) or more
THRTL POS SEN: More than 1.3V
Selector lever: D position
ENG SPEED: 450 rpm or more
If the check result is NG, go to ªDIAGNOSTIC PROCEDUREº,
AT-93.
With GST
Follow the procedure ªWith CONSULT-IIº.
SAT654J
DTC P1778 STEP MOTOR Ð FUNCTION
Description (Cont'd)
AT-92

Diagnostic ProcedureNCAT0230
1 CHECK STEP MOTOR
IIt is monitoring whether ªCVT ratio: 2.32 - 0.47º changes similarly to ªPLY CONT STEP: -3 - 200º by DATA MONITOR mode.
IIf no CONSULT-II, inspect the engine speed (rise and descend) about vehicle speed and throttle opening angle, and check shift
change.
OK or NG
OK©INSPECTION END
NG©Replace CVT assembly.
DTC P1778 STEP MOTOR Ð FUNCTION
Diagnostic Procedure
AT-93

DescriptionNCAT0232IThe CVT fluid pressure sensor detects line pressure of CVT,
and sends TCM the signal.
CONSULT-II REFERENCE VALUE IN DATA MONITOR
MODE
NCAT0232S01Remarks: Specification data are reference values.
Monitor item Condition Specification
CVT fluid pressure sensorThrottle valve fully closed (PL Duty: 4%)
"
Throttle valve fully depressed
(PL Duty: 94%)Approx. 1.0 V
"
Approx. 4.0 V
TCM TERMINALS AND REFERENCE VALUENCAT0232S02Remarks: Specification data are reference values.
Terminal
No.Wire color Item ConditionJudgement
standard
37 W/G
CVT fluid pressure
sensor
When engine runs at idle speed.Approx. 1.0 V
When engine runs at stall speed.Approx. 4.0V
42 B
ÐÐ
46 P/LÐ4.5 - 5.5 V
ON BOARD DIAGNOSIS LOGICNCAT0232S03
Diagnostic trouble code Malfunction is detected when ... Check items (Possible cause)
: LINE PRESS SEN
TCM receives an excessively low or high
voltage from the step motor.IHarness or connectors
(The sensor circuit is open or shorted.)
ICVT fluid pressure sensor
: P1791
: MI Code No. 1791
DTC P1791 CVT FLUID PRESSURE SENSOR
Description
AT-94

DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NCAT0232S04CAUTION:
IAlways drive vehicle at a safe speed.
IBe careful not to rev engine into the red zone on the
tachometer.
NOTE:
If ªDIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DUREº has been previously conducted, always turn ignition
switch ªOFFº and wait at least 5 seconds before conducting
the next test.
After the repair, perform the following procedure to confirm the
malfunction is eliminated.
With CONSULT-II
1) Turn ignition switch ªONº and select ªDATA MONITORº mode
for ªCVTº with CONSULT-II.
2) Make sure that output voltage of CVT fluid temperature sne-
sor is within the range below.
FLUID TEMP SEN: 0.5 - 1.5V
If out of range, drive the vehicle to decrease the voltage
(warm up the fluid) or stop engine to increase the voltage
(cool down the fluid)
3) Select ªDATA MONITORº mode for ªENGINEº with CONSULT-
II.
4) Start engine and maintain the following conditions for at least
5 consecutive seconds.
VHCL SPEED SE: 10 km/h (6 MPH) or more
THRTL POS SEN: 1.3V
Selector lever: D position
ENG SPEED: 450 rpm or more
If the check result is NG, go to ªDiagnostic Procedureº, AT-97.
With GST
Follow the procedure ªWith CONSULT-IIº.
SAT651J
SAT971J
SAT654J
DTC P1791 CVT FLUID PRESSURE SENSOR
Description (Cont'd)
AT-95

Diagnostic ProcedureNCAT0234
1 CHECK PRESSURE SENSOR
Refer to ªComponent Inspectionº, AT-98.
OK or NG
OK (With CONSULT-II)©GO TO 2.
OK (Without CONSULT-II)©GO TO 3.
NG©Repair or replace pressure sensor.
2 CHECK INPUT SIGNAL (With CONSULT-II)
With CONSULT-II
1. Start engine.
2. Select ªECU Input Item Parameter Listº in ªDATA MONITORº mode for ªCVTº with CONSULT-II.
3. Read out the value of ªLINE PRES SENº while driving.
IThrottle valve fully closed (PL Duty: 4%): Approx. 1.0V
IThrottle valve fully depressed (PL Duty: 94%): Approx. 4.0V
OK or NG
OK©GO TO 4.
NG©Check the following items:
IHarness for short or open between TCM, ECM and CVT fluid pressure sensor (Main
harness)
IGround circuit for ECM
Refer to EC section (ªTROUBLE DIAGNOSIS FOR POWER SUPPLYº).
3 CHECK INPUT SIGNAL (Without CONSULT-II)
Without CONSULT-II
Refer to ªComponent Inspectionº, AT-98.
OK or NG
OK©GO TO 4.
NG©Check the following items:
IHarness for short or open between TCM, ECM and CVT fluid pressure sensor (Main
harness).
IGround circuit for ECM
Refer to EC section (ªTROUBLE DIAGNOSIS FOR POWER SUPPLYº).
4 CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-95.
OK or NG
OK©INSPECTION END
NG©1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-
nector.
DTC P1791 CVT FLUID PRESSURE SENSOR
Diagnostic Procedure
AT-97

Component Inspection=NCAT0235CVT FLUID PRESSURE SENSORNCAT0235S01IStart engine.
ICheck voltage between terminals 1 and 6, 6 and 10.
Terminal No. Voltage
16Approx. 0.5 - 4.5V
610Approx. 4.5 - 5.5V
SAT691J CVT fluid pressure sensor connector
DTC P1791 CVT FLUID PRESSURE SENSOR
Component Inspection
AT-98