NISSAN PATROL 2000 Electronic Manual Online

A/T Fluid Temperature Sensor and TCM
Power Source
DESCRIPTION
The A/T fluid temperature sensor detects the A/T fluid tempera-
ture and sends a signal to the TCM.
ON BOARD DIAGNOSIS LOGIC
Diagnostic trouble code Malfunction is detected when ...Check items
(Possible cause)
:
BATT/FLUID TEMP SEN
TCM receives an excessively low or
high voltage from the sensor.+Harness or connectors
(The sensor circuit is open or
shorted.)
+A/T fluid temperature sensor
: 8th judgement flicker
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Remarks: Specification data are reference values.
Monitor item Condition Specification
A/T fluid temperature sensorCold [20ÉC (68ÉF)]
¯
Hot [80ÉC (176ÉF)]Approximately
1.5V
¯
Approximately
0.5V
SELF-DIAGNOSIS CODE CONFIRMATION
PROCEDURE
After the repair, perform the following procedure to confirm the
malfunction is eliminated.
1) Start engine.
2) Select ªSELF-DIAG RESULTSº mode for A/T with
CONSULT-II.
3) Drive vehicle under the following conditions:
Selector lever in ªDº position, vehicle speed higher
than 10 km/h (6 MPH), throttle opening greater than
1/8 of the full open position, engine speed higher than
450 rpm and driving for more than 10 minutes.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------OR-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1) Start engine.
2) Drive vehicle under the following conditions:
Selector lever in ªDº position, vehicle speed higher
than 10 km/h (6 MPH), throttle opening greater than
1/8 of the full open position, engine speed higher than
450 rpm and driving for more than 10 minutes.
3) Perform self-diagnosis.
Refer to SELF-DIAGNOSTIC PROCEDURE (Without
CONSULT-II), AT-1029.
SAT342HA
SAT014K
SAT821H
TROUBLE DIAGNOSIS FOR BATT/FLUID TEMP SEN
AT-1079

DIAGNOSTIC PROCEDURE
CHECK TCM POWER SOURCE.
1. Turn ignition switch to ªONº position.
(Do not start engine.)
2. Check voltage between TCM terminals
V10,V19and ground.
Battery voltage should exist.
OK
cNG
Check the following items:
+Harness for short or
open between ignition
switch and TCM (Main
harness)
+Ignition switch and fuse
Refer to EL section
(ªPOWER SUPPLY
ROUTINGº).
CHECK A/T FLUID TEMPERATURE
SENSOR WITH TERMINAL CORD
ASSEMBLY.
1. Turn ignition switch to ªOFFº position.
2. Disconnect terminal cord assembly
connector in engine compartment.
3. Check resistance between terminals
V8andV9when A/T is cold.
Resistance:
Cold [20ÉC (68ÉF)]
Approximately 2.5 kW
4. Reinstall any part removed.
OK
cNG
1. Remove oil pan.
2. Check the following
items:
+A/T fluid temperature
sensor
Refer to ªCOMPONENT
INSPECTIONº on next
page.
+Harness of terminal cord
assembly for short or
open
VA
(Go to next page.)
SAT248J
SAT249J
.
.
TROUBLE DIAGNOSIS FOR BATT/FLUID TEMP SEN
A/T Fluid Temperature Sensor and TCM
Power Source (Cont'd)
AT-1080

VA
CHECK INPUT SIGNAL OF A/T FLUID
TEMPERATURE SENSOR.
1. Start engine.
2. Select ªTCM INPUT SIGNALSº
in Data Monitor.
3. Read out the value of ªFLUID
TEMP SEº.
Voltage:
Cold [20ÉC (68ÉF)]®
Hot [80ÉC (176ÉF)]:
Approximately
1.5V®0.5V
------------------------------------------------------------------------------------------------------------------------------------OR------------------------------------------------------------------------------------------------------------------------------------
1. Start engine.
2. Check voltage between TCM
terminal
V47and ground while
warming up A/T.
Voltage:
Cold [20ÉC (68ÉF)]®
Hot [80ÉC (176ÉF)]:
Approximately
1.5V®0.5V
OK
cNG
Check the following item:
+Harness for short or
open between TCM and
terminal cord assembly
(Main harness)
Perform ªSELF-DIAGNOSIS CODE CON-
FIRMATION PROCEDUREº, AT-1079.
OK
cNG
1. Perform TCM input/
output signal inspection.
2. If NG, recheck TCM pin
terminals for damage or
loose connection with
harness connector.
INSPECTION END
COMPONENT INSPECTION
A/T fluid temperature sensor
+For removal, refer to AT-1124.
+Check resistance between terminals
V8andV9while chang-
ing temperature as shown at left.
Temperature ÉC (ÉF) Resistance
20 (68) Approximately 2.5 kW
80 (176) Approximately 0.3 kW
SAT738J
SAT250J
SAT252J
.
.
.
TROUBLE DIAGNOSIS FOR BATT/FLUID TEMP SEN
A/T Fluid Temperature Sensor and TCM
Power Source (Cont'd)
AT-1081

Engine Speed Signal
DESCRIPTION
The engine speed signal is sent from the ECM to the TCM.
ON BOARD DIAGNOSIS LOGIC
Diagnostic trouble code Malfunction is detected when ...Check items
(Possible cause)
:
ENGINE SPEED SIG
TCM does not receive the proper volt-
age signal from ECM.+Harness or connectors
(The sensor circuit is open or
shorted.)
:
9th judgement flicker
SELF-DIAGNOSIS CODE CONFIRMATION
PROCEDURE
After the repair, perform the following procedure to confirm the
malfunction is eliminated.
1) Start engine.
2) Select ªSELF-DIAG RESULTSº mode for A/T with
CONSULT-II.
3) Drive vehicle under the following conditions:
Selector lever in ªDº position, vehicle speed higher
than 10 km/h (6 MPH), throttle opening greater than
1/8 of the full throttle position and driving for more than
10 seconds.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------OR-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1) Start engine.
2) Drive vehicle under the following conditions:
Selector lever in ªDº position, vehicle speed higher
than 10 km/h (6 MPH), throttle opening greater than
1/8 of the full throttle position and driving for more than
10 seconds.
3) Perform self-diagnosis.
Refer to SELF-DIAGNOSTIC PROCEDURE (Without
CONSULT-II), AT-1029.
SAT014K
SAT823H
TROUBLE DIAGNOSIS FOR ENGINE SPEED SIG
AT-1082

DIAGNOSTIC PROCEDURE
Perform diagnostic test mode II (self-
diagnostic results) for engine control.
Check ignition signal circuit condition.
OK
cNG
Check ignition signal cir-
cuit for engine control.
Refer to EC section
[TROUBLE DIAGNOSIS
FOR ªIGN SIGNAL-PRI-
MARYº (DTC 21)].
CHECK INPUT SIGNAL.
1. Start engine.
2. Select ªTCM INPUT SIGNALSº
in Data Monitor.
3. Read out the value of ªENGINE
SPEEDº.
Check engine speed changes
according to throttle position.
------------------------------------------------------------------------------------------------------------------------------------OR------------------------------------------------------------------------------------------------------------------------------------
1. Start engine.
2. Check voltage between TCM
terminal
V39and ground.
Voltage:
Refer to EC section.
OK
cNG
Check the following items:
+Harness for short or
open between TCM and
ECM
+Resistor
+Ignition coil
Refer to EC section
[TROUBLE DIAGNOSIS
FOR ªIGN SIGNAL-PRI-
MARYº (DTC 21)].
Perform ªSELF-DIAGNOSIS CODE CON-
FIRMATION PROCEDUREº, AT-1082.
OK
cNG
1. Perform TCM input/
output signal inspection.
2. If NG, recheck TCM pin
terminals for damage or
loose connection with
harness connector.
INSPECTION END
SAT740J
SAT253J
.
.
.
TROUBLE DIAGNOSIS FOR ENGINE SPEED SIG
Engine Speed Signal (Cont'd)
AT-1083

Line Pressure Solenoid Valve
DESCRIPTION
The line pressure solenoid valve regulates the oil pump dis-
charge pressure to suit the driving condition in response to a
signal sent from the TCM.
ON BOARD DIAGNOSIS LOGIC
Diagnostic trouble code Malfunction is detected when ...Check items
(Possible cause)
: LINE PRESSURE S/V
TCM detects an improper voltage drop
when it tries to operate the solenoid
valve.+Harness or connectors
(The solenoid circuit is open or
shorted.)
+Line pressure solenoid valve
: 10th judgement flicker
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Remarks: Specification data are reference values.
Monitor item Condition Specification
Line pressure solenoid valve dutyLow line-pressure
(Small throttle opening)
¯
High line-pressure
(Large throttle opening)Approximately
0%
¯
Approximately
95%
SELF-DIAGNOSIS CODE CONFIRMATION
PROCEDURE
After the repair, perform the following procedure to confirm the
malfunction is eliminated.
1) Start engine.
2) Select ªSELF-DIAG RESULTSº mode for A/T with
CONSULT-II.
3) With brake pedal depressed, shift the lever from ªPº®
ªNº®ªDº®ªNº®ªPº positions.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------OR-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1) Start engine.
2) With brake pedal depressed, shift the lever from ªPº®
ªNº®ªDº®ªNº®ªPº positions.
3) Perform self-diagnosis.
Refer to SELF-DIAGNOSTIC PROCEDURE (Without
CONSULT-II), AT-1029.
SAT341H
SAT014K
SAT824H
TROUBLE DIAGNOSIS FOR LINE PRESSURE S/V
AT-1084

DIAGNOSTIC PROCEDURE
CHECK GROUND CIRCUIT.
1. Turn ignition switch to ªOFFº position.
2. Disconnect terminal cord assembly
connector in engine compartment.
3. Check resistance between terminal
V6
and ground.
Resistance: 2.5 - 5W
OK
cNG
1. Remove control valve
assembly. Refer to
AT-1124.
2. Check the following
items:
+Line pressure sole-
noid valve
Refer to ªCOMPO-
NENT INSPECTIONº
on next page.
+Harness of terminal
cord assembly for
short or open
CHECK POWER SOURCE CIRCUIT.
1. Turn ignition switch to ªOFFº position.
2. Disconnect TCM harness connector.
3. Check resistance between terminal
V6
and TCM harness connector terminal
V2.
Resistance: 11.2 - 12.8W
OK
cNG
Check the following items:
+Dropping resistor
Refer to ªCOMPONENT
INSPECTIONº on next
page.
+Harness for short or
open between TCM ter-
minal
V2and terminal
cord assembly (Main
harness)
CHECK POWER SOURCE CIRCUIT.
1. Turn ignition switch to ªOFFº position.
2. Check resistance between terminal
V6
and TCM harness connector terminal
V1.
Resistance:
Approximately 0W
If OK, check harness for short to
ground and short to power.
3. Reinstall any part removed.
OK
cNG
Repair open circuit or
short to ground or short to
power in harness or con-
nector.
Perform ªSELF-DIAGNOSIS CODE CON-
FIRMATION PROCEDUREº, AT-1084.
OK
cNG
1. Perform TCM input/
output signal inspection.
2. If NG, recheck TCM pin
terminals for damage or
loose connection with
harness connector.
INSPECTION END
SAT254J
SAT255J
.
.
.
.
TROUBLE DIAGNOSIS FOR LINE PRESSURE S/V
Line Pressure Solenoid Valve (Cont'd)
AT-1085

COMPONENT INSPECTION
Line pressure solenoid valve
+For removal, refer to AT-1124.
Resistance check
+Check resistance between terminal
V6and ground.
Solenoid valve Terminal No.Resistance
(Approx.)
Line pressure
solenoid valve
V6Ground 2.5 - 5W
Operation check
+Check solenoid valve by listening for its operating sound
while applying battery voltage to the terminal
V6and ground.
Dropping resistor
+Check resistance between terminalsV1andV2.
Resistance: 11.2 - 12.8W
SAT548IA
SAT549IA
SAT550IC
TROUBLE DIAGNOSIS FOR LINE PRESSURE S/V
Line Pressure Solenoid Valve (Cont'd)
AT-1086

Description
The TCM consists of a microcomputer and connectors for signal
input and output and for power supply. The unit controls the A/T.
ON BOARD DIAGNOSIS LOGIC
Diagnostic trouble code Malfunction is detected when ...Check item
(Possible cause)
:
CONTROL UNIT (RAM)
TCM memory (RAM) or (ROM) is mal-
functioning.TCM
:CONTROL UNIT (ROM)
SELF-DIAGNOSIS CODE CONFIRMATION
PROCEDURE
NOTE:
If ªSELF-DIAGNOSIS CODE CONFIRMATION PROCEDUREº
has been previously conducted, always turn ignition switch
ªOFFº and wait at least 5 seconds before conducting the
next test.
WITH CONSULT-II
1) Turn ignition switch ªONº and select ªDATA MONITORº
mode for A/T with CONSULT-II.
2) Start engine.
3) Run engine for at least 2 seconds at idle speed.
SAT574J
SAT014K
SAT971J
TROUBLE DIAGNOSIS FOR CONTROL UNIT (RAM), CONTROL UNIT (ROM)
AT-1087

Diagnostic Procedure
1 CHECK DTC
WITH CONSULT-II
1. Turn ignition switch ªONº and select ªSELF DIAG RESULTSº mode for A/T with CONSULT-II.
2. Touch ªERASEº.
Perform Self-diagnosis Code confirmation procedure.
See previous page.
Is the ªCONTROL UNIT (RAM) or CONTROL UNIT (ROM)º displayed again?
YescReplace TCM.
NocINSPECTION END
TROUBLE DIAGNOSIS FOR CONTROL UNIT (RAM), CONTROL UNIT (ROM)
AT-1088