1998 NISSAN PATROL sensor

COMPONENT INSPECTION
Engine coolant temperature sensor
Check resistance as shown in the ®gure.
Temperature ÉC (ÉF) Resistance kW
20 (68) 2.1 - 2.9
50 (122) 0.68 - 1.0
90 (194) 0.236 - 0.260
If NG, replace engine coolant temperature sensor.
SEF152P
SEF012P
TROUBLE DIAGNOSIS FOR ``COOLANT TEMP SEN'' (DTC 13)
Engine Coolant Temperature (ECT) Sensor
(Cont'd)
EC-82

Vehicle Speed Sensor (VSS)
The vehicle speed sensor is installed in the transaxle. It contains a
pulse generator which provides a vehicle speed signal to the
speedometer. The speedometer then sends a signal to the ECM.
ECM TERMINALS AND REFERENCE VALUE
Remarks: Speci®cation data are reference values and are measured between each terminal andV43(ECCS
ground) with a voltmeter.
TER-
MINAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC Voltage and Pulse
Signal)
26 L/OR Vehicle speed sensorEngine is running.
Lift up the vehicle.In 1st gear positionVehicle speed is 40 km/h (25 MPH).0 - BATTERY VOLTAGE
(11 - 14V)
SEF717V
ON BOARD DIAGNOSIS LOGIC
Diagnostic
Trouble Code
No.Malfunction is detected when ....Check Items
(Possible Cause)
14+The almost 0 km/h (0 MPH) signal from vehicle speed
sensor is sent to ECM even when vehicle is being
driven.+Harness or connector
(The vehicle speed sensor circuit is open or shorted.)
+Vehicle speed sensor
AEC110
TROUBLE DIAGNOSIS FOR ``VEHICLE SPEED SEN'' (DTC 14)
EC-83

OVERALL FUNCTION CHECK
Use this procedure to check the overall function of the vehicle
speed sensor circuit. During this check, a DTC might not be con-
®rmed.
1) Jack up drive wheels.
2) Start engine.
3) Read vehicle speed sensor signal in ``DATA MONITOR''
mode with CONSULT.
The vehicle speed on CONSULT should be able to
exceed 10 km/h (6 MPH) when rotating wheels with suit-
able gear position.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------OR-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1) Jack up drive wheels.
2) Start engine.
3) Rotate drive wheel by hand.
4) Check voltage between ECM terminal
V26and ground
with tester.
Voltage should vary between 0V - battery voltage.
SEF941N
SEF811R
TROUBLE DIAGNOSIS FOR ``VEHICLE SPEED SEN'' (DTC 14)
Vehicle Speed Sensor (VSS) (Cont'd)
EC-84

TEC426
TROUBLE DIAGNOSIS FOR ``VEHICLE SPEED SEN'' (DTC 14)
Vehicle Speed Sensor (VSS) (Cont'd)
EC-85

DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK INPUT SIGNAL CIRCUIT.
1. Turn ignition switch ``OFF''.
2. Disconnect ECM harness connector
and combination meter harness con-
nector.
3. Check harness continuity between ECM
terminal
V26and meter terminalV26.
Continuity should exist.
If OK, check harness for short to
ground and short to power.
OK
cNG
Check the following.
+Harness connectors
M52,F7
+Joint connectorM79
+Harness for open or
short between ECM and
combination meter
If NG, repair open circuit or
short to ground or short to
power in harness or con-
nectors.
CHECK SPEEDOMETER FUNCTION.
Make sure that speedometer functions
properly.
OK
cNG
Check the following.
+Harness connectors
M86,E104(LHD mod-
els)
+Harness connectors
M21,E127(RHD mod-
els)
+Harness connectors
E70,E201
+Harness for open or
short between combina-
tion meter and vehicle
speed sensor
If NG, repair open circuit or
short to ground or short to
power in harness or con-
nectors.
Check vehicle speed sen-
sor and its circuit.
Refer to EL section.
Disconnect and reconnect harness con-
nectors in the circuit. Then retest.
Trouble is not ®xed.
Check ECM pin terminals for damage and
check the connection of ECM harness
connector. Reconnect ECM harness con-
nector and retest.
INSPECTION END
SEF742V
.
.
.
.
.
TROUBLE DIAGNOSIS FOR ``VEHICLE SPEED SEN'' (DTC 14)
Vehicle Speed Sensor (VSS) (Cont'd)
EC-86

Control Sleeve Position Sensor (CSPS)
The control sleeve position sensor is installed on the electric gov-
ernor. It senses the position of control sleeve (rotor angle) while the
control sleeve is being driven by the electric governor, and feeds it
back to the ECM.
CONSULT REFERENCE VALUE IN DATA MONITOR MODE
Remarks: Speci®cation data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
C/SLEEV POS/S+Engine: After warming up 1.0 - 3.5V
ECM TERMINALS AND REFERENCE VALUE
Remarks: Speci®cation data are reference values and are measured between each terminal andV43(ECCS
ground) with a voltmeter.
TER-
MINAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC Voltage and Pulse
Signal)
53
57WControl sleeve position
sensor power supplyEngine is running.
Idle speedApproximately 2.6V
SEF724V
62
66BControl sleeve position
sensor groundEngine is running.
Idle speedApproximately 2.6V
SEF725V
63
67RControl sleeve position
sensorEngine is running.
Idle speedApproximately 2.6V
SEF726V
SEF743V
TROUBLE DIAGNOSIS FOR ``CONT SLEEV POS SEN'' (DTC 15)
EC-87

ON BOARD DIAGNOSIS LOGIC
Diagnostic
Trouble Code
No.Malfunction is detected when ....Check Items
(Possible cause)
15+An excessively high or low voltage from the sensor is
detected by ECM.
...........................................................................................
+An improper voltage signal from the sensor is
detected by ECM during engine running.+Harness or connectors
(The control sleeve position sensor circuit is open or
shorted.)
+Control sleeve position sensor
DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE
1) Turn ignition switch ``ON'' and select ``DATA MONITOR''
mode with CONSULT.
2) Start engine and run it for at least 2 seconds at idle
speed.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------OR-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1) Start engine and run it for at least 2 seconds at idle
speed.
2) Turn ignition switch ``OFF'', wait at least 5 seconds and
then ``ON''.
3) Perform ``Diagnostic Test Mode II (Self-diagnostic
results)'' with ECM.
SEF714V
TROUBLE DIAGNOSIS FOR ``CONT SLEEV POS SEN'' (DTC 15)
Control Sleeve Position Sensor (CSPS) (Cont'd)
EC-88

TEC427
TROUBLE DIAGNOSIS FOR ``CONT SLEEV POS SEN'' (DTC 15)
Control Sleeve Position Sensor (CSPS) (Cont'd)
EC-89