2000 NISSAN PATROL check engine

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

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)
: CONT UNIT (EEP ROM)TCM memory (EEP ROM) is malfunc-
tioning.TCM
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 (EFP ROM)
AT-1089

DIAGNOSTIC PROCEDURE
CHECK PNP SWITCH CIRCUIT.
1. Turn ignition switch to ªONº
position.
(Do not start engine.)
2. Select ªTCM INPUT SIGNALSº
in Data Monitor.
3. Read out ªR, N, D, 2 and 1
position switchesº moving
selector lever to each position.
Check the signal of the selector
lever position is indicated prop-
erly.
------------------------------------------------------------------------------------------------------------------------------------OR------------------------------------------------------------------------------------------------------------------------------------
1. Turn ignition switch to ªONº
position. (Do not start engine.)
2. Check voltage between TCM
terminals
V26,V27,V34,V35,V36
and ground while moving selec-
tor lever through each position.
Voltage:
B: Battery voltage
0: 0V
OK
cNG
Check the following items:
+PNP switch
Refer to ªCOMPONENT
INSPECTIONº,
AT-1095.
+Harness for short or
open between ignition
switch and PNP switch
(Main harness)
+Harness for short or
open between PNP
switch and TCM (Main
harness)
+Diode
VA
(Go to next page.)
Lever positionTerminal No.V36V35V34V27V26
P, NB0000
R0B000
D00B00
2 000B0
1 0000B
SAT738J
SAT227J
.
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMS
PNP, Overdrive Control, A/T Mode or
Accelerator Position Switches (Cont'd)
AT-1092

VA
CHECK OVERDRIVE CONTROL
SWITCH CIRCUIT.
Ð Except for the Middle East Ð
1. Turn ignition switch to ªONº
position.
(Do not start engine.)
2. Select ªTCM INPUT SIGNALSº
in Data Monitor.
3. Read out ªOVERDRIVE
SWITCHº.
Check the signal of the over-
drive control switch is indicated
properly.
(Overdrive control switch ªONº
displayed on CONSULT-II
means overdrive ªOFFº.)
------------------------------------------------------------------------------------------------------------------------------------OR------------------------------------------------------------------------------------------------------------------------------------
1. Turn ignition switch to ªONº
position.
(Do not start engine.)
2. Check voltage between TCM
terminal
V22and ground when
overdrive control switch is ªONº
and ªOFFº.
OK
cNG
Check the following items.
+Overdrive control switch
Refer to ªCOMPONENT
INSPECTIONº,
AT-1095.
+Harness for short or
open between TCM and
overdrive control switch
(Main harness)
+Harness for short or
open of ground circuit
for overdrive control
switch (Main harness)
VB
(Go to next page.)
Switch position Voltage
ON Battery voltage
OFF 1V or less
SAT740J
SAT224J
.
.
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMS
PNP, Overdrive Control, A/T Mode or
Accelerator Position Switches (Cont'd)
AT-1093

VB
CHECK ACCELERATOR POSITION
SWITCH CIRCUIT.
1. Turn ignition switch to ªONº
position.
(Do not start engine.)
2. Select ªTCM INPUT SIGNALSº
in Data Monitor.
3. Read out ªCLOSED THL/SWº
and ªW/O THRL/P-SWº
depressing and releasing accel-
erator pedal.
Check the signal of accelerator
position switch is indicated
properly.
------------------------------------------------------------------------------------------------------------------------------------OR------------------------------------------------------------------------------------------------------------------------------------
1. Turn ignition switch to ªONº
position.
(Do not start engine.)
2. Check voltage between TCM
terminals
V16,V17and ground
while depressing, and releasing
accelerator pedal slowly. (after
warming up engine)
OK
cNG
Check the following items:
+Accelerator position
switch
Refer to ªCOMPONENT
INSPECTIONº,
AT-1096.
+Harness for short or
open between ignition
switch and accelerator
position switch (Main
harness)
+Harness for short or
open between accelera-
tor position switch and
TCM (Main harness)
Perform ªDIAGNOSTIC PROCEDUREº,
AT-1092.
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
Accelerator
pedal condi-
tionData monitor
CLOSED
THL/SWW/O THRL/
P-SW
Released ON OFF
Fully
depressedOFF ON
Accelerator
pedal condi-
tionVoltage
Terminal
No.
V16Terminal No.
V17
ReleasedBattery volt-
age1V or less
Fully
depressed1V or lessBattery
voltage
SAT739J
SAT226J
.
.
.
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMS
PNP, Overdrive Control, A/T Mode or
Accelerator Position Switches (Cont'd)
AT-1094

1. SPORT Indicator Lamp Does Not Come On
SYMPTOM:
SPORT indicator lamp does not come on for about 2 sec-
onds when turning ignition switch to ªONº.
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 TCM GROUND CIRCUIT.
1. Turn ignition switch to ªOFFº position.
2. Disconnect TCM harness connector.
3. Check resistance between TCM termi-
nals
V25,V48and ground.
Resistance:
Approximately 0W
If OK, check harness for short to
ground and short to power.
OK
cNG
Repair open circuit or
short to ground or short to
power in harness or con-
nector.
CHECK LAMP CIRCUIT.
1. Turn ignition switch to ªONº position.
2. Set A/T mode switch to ªSPORTº posi-
tion.
3. Check voltage between TCM terminal
V13and ground.
Voltage: Battery voltage
4. Reinstall any part removed.
OK
cNG
Check the following items:
+Fuse (7.5A)
+SPORT indicator lamp
Refer to EL section
(ªWARNING LAMPSº).
+Harness for short or
open between ignition
switch and SPORT indi-
cator lamp (Main har-
ness)
Refer to EL section
(ªPOWER SUPPLY
ROUTINGº).
+Harness for short or
open between SPORT
indicator lamp and TCM
Check again.
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
SAT211JA
SAT256J
SAT257J
SAT258J
.
.
. .
.
DIAGNOSTIC PROCEDURES FOR SYMPTOMS
AT-1097

5. Engine Cannot Be Started In ªPº and ªNº
Position
SYMPTOM:
+Engine cannot be started with selector lever in ªPº or
ªNº position.
+Engine can be started with selector lever in ªDº, ª2º, ª1º
or ªRº position.
Does ªTCM INPUT SIGNALSº in
Data Monitor show damage to
PNP switch circuit?
------------------------------------------------------------------------------------------------------------------------------------OR------------------------------------------------------------------------------------------------------------------------------------
Does self-diagnosis show damage
to PNP switch circuit?
No
cYes
Check PNP switch. Refer
to AT-1091.
Check for short or open of PNP switch
2-pin connector. Refer to AT-1095.
OK
cNG
Repair or replace PNP
switch.
Check starting system. Refer to EL sec-
tion (ªSystem Descriptionº, ªSTARTING
SYSTEMº).
OK
cNG
Repair or replace dam-
aged parts.
INSPECTION END
6. In ªPº Position, Vehicle Moves Forward Or
Backward When Pushed
SYMPTOM:
Vehicle moves when it is pushed forward or backward with
selector lever in ªPº position.
Check parking pawl components. Refer to
AT-1184.
OK
cNG
Repair or replace dam-
aged parts.
INSPECTION END
SAT146BA
SAT259JA
SAT133B
.
.
.
.
DIAGNOSTIC PROCEDURES FOR SYMPTOMS
AT-1100

16. A/T Does Not Hold Lock-up Condition
SYMPTOM:
A/T does not hold lock-up condition for more than 30 sec-
onds.
Does self-diagnosis show damage to
engine speed signal circuit after cruise
test?
No
cYes
Check engine speed sig-
nal. Refer to AT-1082.
1. Remove oil pan.
2. Check A/T fluid condition.
OK
cNG
1. Remove control valve
assembly. Refer to
AT-1124.
2. Check the following
items:
+Torque converter clutch
control valve
+Pilot valve
+Pilot filter
3. Disassemble A/T.
4. Check torque converter
and oil pump assembly.
1. Remove control valve assembly. Refer
to AT-1124.
2. Check the following items:
+Torque converter clutch control valve
+Pilot valve
+Pilot filter
OKOKb
Check again.
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
17. Lock-up Is Not Released
SYMPTOM:
Lock-up is not released when accelerator pedal is released.
Does ªTCM INPUT SIGNALSº in
Data Monitor show damage to
closed throttle position switch cir-
cuit?
------------------------------------------------------------------------------------------------------------------------------------OR------------------------------------------------------------------------------------------------------------------------------------
Does self-diagnosis show damage
to closed throttle position switch
circuit?
No
cYes
Check closed throttle posi-
tion switch. Refer to
AT-1091.
Check again.
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
SAT835H
SAT171B
SAT146BA
.
.
. .
.
.
.
DIAGNOSTIC PROCEDURES FOR SYMPTOMS
AT-1110