1991 MITSUBISHI 3000GT sensor

23-20AUTOMATIC TRANSAXLE - Troubleshootina
TROUBLESHOOTING GUIDE
‘resumed cause
38Malfunction of transaxle control unttX
NOTE- @ indicates items of prlortty during Inspection.PSCV = Pressure control solenoid valveAbbrewatlons TPS = Throttle powon sensor
DCCSV = Damper clutch control solenoid valveSCSV = Shift control solenoid valveOD = Overdwe
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23-24AUTOMATIC TRANSAXLE - Troubleshooting
FAULT CODEDESCRIPTIONCode
No.Display PatternItemRemedial Action
Excessively large throttle
position sensor outputl Check throttle position sensor
connector.
l Check throttle position sensor
on bench.
12Excessively small throttle
position sensor outputl Adjust throttle position sensor.
l Check accelerator switch
(whether code number 24 is being
output).
13Defective or improperly
adjusted throttle position
sensor
14
Improperly adjusted throttle
position sensor
Open-circuited low-oil-
temperature sensorl Check oil temperature sensor
connector.
l Check oil temperature sensor on
bench.
16Short-circuited high-oil-
I-lMnnM-.temperature sensor
17
Open-circuited high-oil-
rlnnnruuvltemperature sensor or short-
circuited low-oil-temperature
sensor
Open-circuited kickdown servo
switch
Short-circuited kickdown servo
switchl Check kickdown servo switch
connector.
l Check kickdown servo switch on
bench.
Open-circuited ignition pulse
pickup cablel Check ignition pulse signal line.
24Open-circuited or improperly
adjusted accelerator switchl Check accelerator switch connector
l Check accelerator switch on bench.
l Adjust accelerator switch.
12A010412A0107
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23-28AUTOMATIC TRANSAXLE - Troubleshooting
INSPECTION OF CONTROL SYSTEMCheck the control system by using the multi-use tester and following the procedure given below.
CONTROL SYSTEM INSPECTION TABLE
Check Item
sensor
l Data listl Item No. 15Cold engine (before start)nglne warming up
l Data listl Item No. 23
or circuitharness
Item No. 26
lerator pedal switchl
Item No. 27l Defective inhibitor switch circuitl Defective TPS circuitl
Defective pulse generator A
shielded wire
l External noise interference
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23-30AUTOMATIC TRANSAXLE - Troubleshooting
TRANSMISSION CONTROL UNIT
The connector has 42 pins to accommodate the increased number of senso.r inputs.
Here are the pin assignments.
uu
101.102.103.
104.105.
106.
107.
108.
109.
110.
1.
3':4.
Z:
i:9.10.11.
12.
13.
14.
15.
16.
17.
18.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
63.
64.Damper clutch control solenoid valve
Shift control solenoid valve A
-Power source
Ground
Pressure control solenoid valve
Shift control solenoid valve B
. .
*Engine communrcatron srgnaiPower source
Ground
Ground
-Accelerator switch
-Diagnosis output terminal
Air-conditioner relay signal
Engine communication signal
Diagnosis control terminal
Engine communication signal
Power source (backup)Kickdown servo switch
Idle switch
oil temperature sensor (Low temperature side)
Oil temperature sensor (High temperature side)
Throttle position sensor
Sensor ground
Vehicle-speed reed switch
Inhibitor switch
(P)Inhibitor switch (R)Inhibitor switch (N)Inhibitor switch (D)
Inhibitor switch (2)
Inhibitor switch
(L)Overdrive switch
Pulse generator B
Pulse generator B
Pulse generator A
Pulse generator A
Ground
Ignition pulse
Power mode signal
TFA0360
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23-32AUTOMATIC TRANSAXLE - Troubleshooting
INSPECTION OF ELECTRONIC CONTROL SYSTEM COMPONENTS
1. WiringBased on the wiring diagram.check whether the continuity andgrounding of each harness is OK.
I
(
4
ContinuityII
+
Normal~ Improper connection of
connector, damaged ordisconnected harness,
or incorrect wiring con-
nection.
I
Reconnect the connec-tor; repair or replace theharness.Vary the thermo-sensitive part
2. Oil-temperaturefrom low temperature to highsensortemperature and check theresist-Damaged or disconnected
ante between the terminals 1 anwiring2or2and3.
4
J
Changes of the resistance con-Replace the oil-
tinuous and smooth.temperature sensor
41750447
Normal1
1:LOW temperature side2: Ground
3:High temperature side
I:3. Throttle-
K
Check the resistance between
Ip~~~t,ion sensorterminals 1 and 4 of the TPS.hiah or infinitem- -----inecteciI-
\ IDamaged or discon-..----Awiring
I
c3.5 - 6.5 kW20”C (68°F)t
v
Replace the TPS.I>ITPS terminal
7FUO5351. Ground
2. Idle switch
3. output
4. Power
Check the resistance betweenterminals 4 and 2 with the engine
idling after throttle-valve opening
warm-up.
Resistance: approx. 0.4
kR/20°C (68°F)
Changes of the resistance con-
tinuous and smooth.
/Resistance:\more or less
than 0.4 kQ/Improper adjustment
Istallaiion.I
Check for changes of theresist-ance between terminals 4 and 2when the throttle valve is
operated from the idling position
o the fully open position.
Poor contactII
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23-48AUTOMATIC TRANSAXLE - Service Adjustment Procedures
Adjusting screw4
or~0\====m00~7/IIIITFAm
c-1
Pi(8) Tighten lock nut by hand until it contacts piston. Then, using
torque wrench, tighten to specification.
Lock nut: 29 Nm (21
ftlbs.)Caution
Use of socket wrench or torque wrench could result in
lock nut being turned with adjust rod.
(9) Remove the special tool to secure the piston and torque
plug to specification at L/R brake pressure take-up port.
LINE PRESSURE ADJUSTMENT
(I) Discharge AFT.
(2) Remove oil pan.
(3) Remove oil filter.
(4) Remove oil temperature sensor.
M23FSAC(5) Press solenoid valve harness grommet catch to push in
grommet; then, remove valve body assembly.
Caution
Do not let manual valve fall.
(6) Turn adjusting screw of regulator valve to obtain the
specified line pressure
(K/D brake pressure).
Standard value:870
- 890 kPa (124 - 127 psi)
Oil pressure change for
each turn of adjustment screw:38
kPa (54 psi)
(7)Check that an O-ring is fitted at the location shown on top off
valve body.
(8) Replace O-ring of solenoid valve intermediate grommet
with a new one and then fit the O-ring into case.6
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AUTOMATIC TRANSAXLE - Service Adjustment Procedures23-49
1(9) Install valve body and oil temperature sensor.
Bolt A
= Length 18 mm (.709 in.)
Bolt B
= Length 25 mm (.984 in.)
Bolt C
= Length 40 mm (1.575 in.)
CautionSecure solenoid valve and oil temperature sensor
harness at locations shown.
(1O)lnstall oil filter.(1l)lnstall new oil pan gasket and oil pan.
(12)Add the specified amount of ATF.
(13)Carry out hydraulic test.
Readjust as necessary.
REDUCING PRESSURE ADJUSTMENTh323FfADWhen multi-use tester is not used
(1) Following the same steps as those in line pressure
adjustment, remove parts up to oil filter.
There is no need to remove valve body.
(2) Turn adjusting screw of lower valve body to obtain the
specified reducing pressure. Turn it counterclockwise to
increase the pressure.
Standard value:425 f 10 kPa (60 f 1 psi)
Oil pressure change for
each turn of adjusting screw:45 kPa (6 psi)(3) In the same way as in line pressure adjustment,
/nstall oil
filter and oil pan.
(4) Perform hydraulic test.
Adjust as necessary.
When multi-use tester is used
(1) Adjust to obtain the specified K/D brake pressure when PC
solenoid is energized at duty 50% with the multi-use tester.
Standard value:275 kPa (39 psi)
Oil pressure change for
each turn of adjusting screw:50 kPa (7 psi)(2) After adjustment has been made, check that the recuding
pressure is in the range 360
- 480 kPa (51 - 68 psi).
Caution
This adjustment should be made with oil temperature70
- 80°C (160 - 180°F).
The adjustment made with high oil temperature couldresult in improper adjustment due to a line pressure
drop at idle.
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23-62AUTOMATIC TRANSAXLE - Transaxle AssemblyTRANSAXLE ASSEMBLY
REMOVAL AND INSTALLATION
MZJLA- -
Pre-removal Operationl Place Selector Lever in “N” Position
and Stop the Engine.
l Draining of Transaxle Fluid
(Refer to GROUP 00
- Maintenance
Service.)
l Removal of Front Under Cover
(Referto GROUP 51 -Front Bumper.)09FO112
Removal steps
1. Side under cover2. Battery
3. Battery seat, Washer tank
4. kiorsteaner cover, Air intake
l +5. Connection for transaxle controlcable
4*
6. Connection for oil cooler hose
7. Inhibitor switch connector
8.
Kickdown servo switch connector
9. Pulse generator connector
10 Oil temperature sensor connector
11. Shift control solenoid valve connector
12. Connection for speedometer cable
13. Connection for transaxle mount bracket70 Nm
51
ft.lbs.
70 Nm
51 ft.lbs.I
09FOO81
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