1991 MITSUBISHI 3000GT display

CRUISE CONTROL SYSTEM - Troubleshooting
DIAGNOSIS DISPLAY PATTERNS AND CODES
13473
CodeDisplay patterns (output codes)Probable causeCheck chart No.No.(Use with voltmeter)
11l-l n-JILL
The same pattern repeatedly displayed
Vacuum pump assembly drive output systemout of order5
I I12Vehicle speed signal system out of orderI4I
I In
Control switch out of order (When SET or2RESUME switch is kept in ON statecontinuously for more than 60 seconds)
Control switch out of order
Throttle position sensor or idle switch out9
of order
Normal code
12AOlOa
NOTE
1. When two or more problems occur simultaneously, the
three latest code numbers are displayed in the order of
lowest code number first.
2. Even if the problem represented by the code number
marked * occurs during cruise control operation, the cruise
control mode will not be canceled.
3.When the system is normal, the diagnosis code is displayed
as described below.@ If a multi-use tester is used:
“NORMAL!
! I’ will be displayed.@ If a voltmeter is used:
Continuous ON/OFF signals will be displayed at 0.5
second intervals. (Refer to the illustration at the left.)
INPUT CHECKINGInput checks should be made when the cruise control system
cannot be set and when it is necessary to check (when a
malfunction related to the cruise control system occurs)
whether or not the input signals are normal.
NOTE
1.If inspection of self-diagnosis is necessary, confirm diagno-
sis code first and conduct input check.
2. Input check can be conducted by set operations.
Self-diagnosis terminal outputs display patterns.
3. Display codes are displayed only if the circuit is normal
according to the conditions shown in the table on the next
paw.Perform checks using the following procedures.
(1) Connect a multi-use tester or a voltmeter to the diagnosis
inspection connector of the junction block.
NOTEConnect a voltmeter using the same procedure as for
inspection of diagnosis output.
TSB Revision

13-174CRUISE CONTROL SYSTEM - Troubleshooting
(2) Calling up a code
Control switch
SUME
itch: ON
t
4SET switch:
ON@ Set the ignition switch to ON.@ With the SET switch in the ON state, set the main
switch to ON. In less than 1
.O second thereafter, set theI,/RESUME switch to ON. Then the input check results
can be displayed.
07FOO17 I(3) Reading a code@ Perform the individual input operations according to the
input check table and read the codes.
NOTE1. When two or more input operations are performed
simultaneously, all the associated code numbers are
output in ascending order.
2.If no code is output by performing any of the input
operations, the control unit power supply circuit or
SET and RESUME switches are probably defective.
Check the check tables 1 and 2
(P.13-163, 164).
1 TSB Revision1

CRUISE CONTROL SYSTEM - Troubleshooting
INPUT CHECK TABLE
odeDisplay patterns (output codes)Input operationCheck results40.(use with voltmeter)
21SET switch ONSET switch circuit normal
n
22RESUME switch.ONRESUME switch normal
23
nn
Stop light switch ON(brake pedal depressed)
Stop light switch circuit normal
24Vehicle speed more than approx.
40 km/h (25 mph)Vehicle speed sensor circuitnormal if code Nos. 24 and 25
are displayed
25Vehicle speed less than approx.
40 km/h (25 mph)
26M/T
Clutch switch ON
-1~ ~~;~~o~~i~~~~;sed’
(SELECT lever placedin “N” position)Clutch switch circuit normal
Inhibitor switch circuit normal
27CANCEL switch ONCANCEL switch circuit normal
TPS output voltage 1.5 V or more
Throttle position sensor circuit
(Accelerator pedal depressed more normal
than half the way)
Idle switch OFF (Accelerator pedalIdle switch circuit normal
depressed)@ Set main switch to OFF.
1 TSB RevisionI

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
1 TSB RevisionI

AUTOMATIC TRANSAXLE - Troubleshooting23-25
L
L
ZodeNo.
31Display Pattern
ItemRemedial Action
Open-circuited pulse generator Al Check pulse generator A or B on
bench.
32l Check vehicle-speed reed switch
(chattering).
Open-circuited pulse generator B
Open-circuited shift control
solenoid valve Al Check solenoid valve connector.
l Check shift control solenoid valve
A on bench.
42Short-circuited shift control
solenoid valve A
Open-circuited shift control
solenoid valve Bl Check solenoid valve connector.
l Check shift control solenoid valve
B on bench.
Short-circuited shift control
solenoid valve B
45
uuuLNulM-Open-circuited pressure controll Check solenoid valve connector.
solenoid valvel Check pressure control solenoid
valve on bench.
46Short-circuited pressure
control solenoid valve
Open-circuited damper clutch
control solenoid valvel Check solenoid valve connector.
l Check damper clutch control
solenoid valve on bench.
Short-circuited damper clutch
control solenoid valve
49Defective damper clutch systeml Check damper clutch hydraulic
circuit.
lllJl!-l Check damper clutch control
solenoid valve on bench.0 Replace control unit.
12A010712A0105
TSB Revision

23-26AUTOMATIC TRANSAXLE - Troubleshooting
Code
No.Display PatternItemRemedial Action
1 st speed shift not finishl Check connectors of pulse
generators A and
B.l Check pulse generators A and B on
bench.
l Rear clutch slipping
52
uuuuu-ln-2nd speed shift not finishl Check connectors of pulse
generators A and B.
l Check pulse generators A and B on
bench.
l Rear clutch slipping
533rd speed shift not finishl Kickdown brake slipping
l Check connectors of pulse
generators A and B.
4th speed shift not finishl Check pulse generators A and B on
bench.
l Front clutch slipping
l Rear clutch slipping
l Check connectors of pulse
generators A and B.
l Check pulse generators A and B on
bench.
l End clutch slipping
6162l Kickdown brake slipping
Short-circuited torque
reduction request signal linel Check torque reduction request
or open-circuited torquesignal line.
reduction execution signal linel Check torque reduction execution
signal line.
Open-circuited torque reduction
request signal line0 Check torque reduction request
signal line.
63Short-circuited torque
reduction execution signal linel Check torque reduction execution
signal line.
12A0106
‘J
\J
TSB Revision

AUTOMATIC TRANSAXLE - Troubleshootinn23-27
FAIL-SAFE CODE DESCRIPTION
DdeVO.
81Display Pattern
Item
Open-circuited pulse
generator AFail-safe
Fixed at 3rd (D)or 2nd (2, L)Related
Self-Diagnosis3182Open-circulted pulse
Fixed at 3rd (D)32
generator Bor 2nd (2,
L)83Open- or short-circuited Fixed at 3rd
shift control solenoid
valve A
41,4284Open- or short-circuited Fixed at 3rd
shift control solenoid
valve B
43,4485Open- or short-circuited Fixed at 3rd (D)
45,46
uuu-pressure control
or 2nd
(2, L)solenoid valve
86Shift not finishFixed at 3rd (D)
51,52
uuumor 2nd (2,
L)53,54
12L0296
i
TSB Revision

33B-4ELECTRONIC CONTROL SUSPENSION (ECS) - TroubleshootingTROUBLESHOOTING
M33EAAE
QUICK REFERENCE CHART FOR TROUBLESHOOTING
SymptomsXS
indicator lightdoes not switch
TROUBLESHOOTING HINTS
“1. The G. sensor is a sensor associated with ride control (detecting pitching, bouncing and rough road). If itfails, therefore, ride control stops.
“2. A self diagnostic decision on the steering angular velocity sensor is made by the ECS control unit which
internally detects the voltages of the two sensor output lines connected to the ECS control unit to detectan open circuit in the signal line. When the signal line is short-circuited or when the power line is
open-circuited, however, it cannot be detected. In a situation where anti-roll control only stops, if
self-diagnosis code No. 21 is not on display, a short-circuited sensor output line or open-circuited sensorpower line is suspected.
“3. The vehicle speed sensor is a sensor associated with attitude controls (anti-dive, anti-squat) and steering
stability controls (anti-roll, high speed sensitive controls). If all these controls stop, therefore, trouble in the
sensor is suspected. The vehicle speed sensor is also in use for operation of the speedometer and for theother electronics controlled systems for the engine, automatic transaxle, etc.
“4. The sensor associated with anti-squat control is the throttle position sensor. The sensor is also used for
control of the engine and automatic transaxle. If the sensor fails, therefore, the check engine light in the
combination meter will light, and engine self-diagnosis code No. 14 will be output. In a situation whereanti-squat control only stops, therefore, if the check engine light does not light, defective wiring is
suspected between the ECS control unit and throttle position sensor.
TSB Revision