shift MITSUBISHI TRITON 1997 Workshop Manual

MPI ± Troubleshooting13A-57
DATA LIST REFERENCE TABLE13100890180
Caution
When shifting the select lever to D range, the brakes should be applied so that the vehicle does
not move forward.
NOTE
*1. In a new vehicle [driven approximately 500 km or less], the air flow sensor output frequency is sometimes
10% higher than the standard frequency.
*
2. The idle position switch normally turns off when the voltage of the throttle position sensor is 50 ±
100 mV higher than the voltage at the idle position. If the idle position switch turns back on after
the throttle position sensor voltage has been by 100 mV and the throttle valve has been opened,
the idle position switch and the throttle position sensor need to be adjusted.
*3. The injector drive time represents the time when the cranking speed is at 250 r/min or below when
the power supply voltage is 11 V.
*4. In a new vehicle [driven approximately 500 km or less], the injector drive time is sometimes 10%
longer than the standard time.
*5. In a new vehicle [driven approximately 500 km or less], the step of the stepper motor is sometimes
30 steps greater than the standard value.
Item
No.Inspection
itemInspection contentsNormal conditionInspection
procedure
No.Reference
page
11Oxygen
sensorEngine:After having
warmed up
Air/fuel mixture is
made leaner when de-
When at 4,000 r/min,
engine is suddenly
decelerated200 mV or lessCode No.
1113A-11
made leaner when de-
celerating, and is made
richer when racing.
When engine is
suddenly raced600 ± 1,000 mV
Engine:After having
warmed up
The oxygen sensor
signal is used to check
the air/fuel mixture
ratio and control
Engine is idling400 mV or less
(Changes)
600 ± 1,000 mV
ratio, and control
condition by the en-
gine-ECU.2,500 r/min400 mV or less
(Changes)
600 ± 1,000 mV
12Air flow
sensor*1
Engine coolant
temperature:
80 ± 95C

Lamps and all
accessories: OFF
Engine is idling22 ± 48 Hz
<4G63>
19 ± 45 Hz
<4G64>±±
accessories: OFF

Transmission:
Neutral (A/T:
P range)2,500 r/min80 ± 120 Hz
<4G63>
67 ± 107 Hz
<4G64>
Engine is racedFrequency
increases in
response to
racing

MANUAL TRANSMISSION ± General Information22-2
GENERAL INFORMATION22100010113
ItemsVehicles with 4G63 engineVehicles with 4D56 engine
Transmission modelR5M21-5R5M21-5
Type5-speed, floor-shift5-speed, floor-shift
Gear ratio1st4.3304.330
2nd2.3552.355
3rd1.5091.509
4th1.0001.000
5th0.8270.827
Reverse4.1424.142
Speedometer gear ratio (driven/drive)29/826/8
ItemsVehicles with 4G64 engineVehicles with 4D56 engine
Transmission modelV5M21-9V5MT1-4
Type5-speed, floor-shift5-speed, floor-shift
Gear ratio1st3.9673.918
2nd2.1362.261
3rd1.3601.395
4th1.0001.000
5th0.8560.829
Reverse3.5783.925
Transfer type2-speed2-speed
Gear ratioHigh1.0001.000
Low1.9251.925
Speedometer gear ratio (driven/drive)27/825/8

MANUAL TRANSMISSION ± 4WD Indicator-ECU22-16
Terminal No.Inspection itemInspection condition
1: Ignition switchInspection condition
2: Transfer lever positionTerminal voltage
1Free wheel engage
switch
ON2HSystem voltage
switch
4H*10 V
24WD detection
switch
ON2HSystem voltage
switch
4H, 4L0 V
3Ignition switch (IG1)OFF±0 V
ON±System voltage
5Free wheel differen-
tial indicator lamp
ON2HSystem voltage
tial indicator lam
4H*10 V
6HI/LOW detection
switchONShifting from 4H to 4L
or vice versaSystem voltage
2H, 4H, 4L0 V
7Free wheel clutch
changeover solenoid
ON4H, 4L0 V
changeover solenoid
valve2H*2System voltage
104WD Indicator lampON2H0 V
4H, 4LSystem voltage
NOTE
*1: When vehicle has been moved once.
*2: Shift the lever from 4H to 2H, and then turn the ignition switch to OFF and then back to ON.

AUTOMATIC TRANSMISSION ±
General Information/
Service Specifications23-2
GENERAL INFORMATION23100010141
ItemsVehicles with 4G63 engineVehicles with 4D56 engine
Transmission modelR4AW2-6V4AW2-6
Type4-speed full automatic4-speed full automatic
Gear ratio1st2.8262.826
2nd1.4931.493
3rd1.0001.000
4th0.7300.688
Reverse2.7032.703
Transfer type±2-speed
Gear ratioHigh±1.000
Low±1.925
Speedometer gear ratio (driven/drive)22/625/8
SERVICE SPECIFICATIONS23100030130
ItemsStandard value
Distance between inner cable stopper and end of outer cable <4G63> mm0 ± 1
Distance between inner cable stopper and end of outer cable <4D56> mm34 ± 35
Lock-up solenoid valve coil resistance (at 20
C) WApprox. 13
Stall speed r/min4G632,100 ± 2,400
4D562,300 ± 2,600
Governor pressure kPa1,000 r/min137 ± 166
2,000 r/min245 ± 284
3,200 r/min402 ± 460
Line pressure kPaAt idle speedD range480 ± 558
R range735 ± 852
At stall speedD range1,019 ± 1,195
R range1,519 ± 1,911
Operation temperature of engine coolant
temperature switch
C
On (continuity)50 + 3
tem erature switch
C
Off (no continuity)43
Clearance between shift lever guide and steering column mm2.4 ± 3.6

AUTOMATIC TRANSMISSION ± Troubleshooting23-4
TROUBLESHOOTING23100760152
STANDARD FLOW OF DIAGNOSIS TROUBLESHOOTING
Automatic transmission malfunctions may be caused by the following conditions.
(1) Improper maintenance and adjustment
(2) Shift control system malfunction
(3) Mechanical malfunctions
(4) Hydraulic malfunctions
(5) Poor engine performance
Troubleshooting in the event of any such malfunctions should begin by checking fluid level, ATF condition,
manual linkage adjustment, throttle control cable adjustment and other conditions whose deviation from
standards can be readily known. Then, road test shall be performed to determine whether or not the
problem has been corrected or more diagnosis is necessary. If the problem still persists after these tests
and corrections, hydraulic tests should be performed for further troubleshooting.
Road test (guess what causes malfunc-
tion.)
Check how A/T works in each drive
range to find a defective system.
A/T control component inspection
Check the throttle cable, inhibitor switch,
overdrive switch, overdrive solenoid
valve, overdrive control relay, defective
switch, engine coolant temperature
switch and vehicle speed sensor.
Torque converter stall test (Inspection
of engine performance and mechanical
function)
Check the engine performance, torque
converter operation and clutch and
brake sliding performance.
Hydraulic pressure test (Inspection of
hydraulic control mechanism)
Measure the fluid line pressure and
check for malfunctions of the oil pump
or regulator valve and for oil leaks.
Oil leak inspection
Visually check gaskets and oil seals for
leaks.
Adjustment of basic inspection items
ROAD TEST 23100780158
Prior to performing road test, be sure to make basic checks including check and adjustment of fluid
level and condition and adjustment of the throttle cable. For road test, the transfer must be placed in
the 2H (2WD-high) position. In road test, various changes such as slips in transmission and shifting
conditions are checked and the transmission operation at each shift position must have been checked.

AUTOMATIC TRANSMISSION ± Troubleshooting23-5
D RANGE TEST
Correct
Carry out the TEST 1 again.
Ye s
Check the shifting points.Incorrect
Line pressure malfunction

Governor malfunction

Incorrect throttle cable adjustment
Ye s
Does the upshift from 3-speed to 4-speed occur? (with throttle
valve opening under 85%)No
3 ± 4 shift valve malfunction

Governor malfunction

Overdrive switch or overdrive solenoid malfunction

Overdrive control relay malfunction

Engine coolant temperature switch malfunction <4G6>
Ye s
Does the upshift from 2-speed to 3-speed occur?No
2 ± 3 shift valve malfunction

Governor malfunction
NG
Does the upshift from 1-speed to 2-speed occur?No
1 ± 2 shift valve malfunction

Governor malfunction
TEST 1
Start with throttle valve opened (50 % and full), and check upshift
from 1-speed  2-speed, 2-speed 3-speed and 3-speed 
4-speed. Check that shifting points match shift pattern.OKTEST 2
Correct
Carry out TEST 2 again.
Ye s
Check the shifting point.Incorrect
Line pressure malfunction

Governor malfunction

Detent regulator valve malfunction
NG
Does the downshift occur?No
Shift valves malfunction

Governor malfunction

Overdrive switch or overdrive solenoid malfunction

Overdrive control relay malfunction

Detection switch malfunction
TEST 2
Kickdown traveling at 2-speed, 3-speed and 4-speed. Check that
possible kickdown vehicle speed limit at 2-speed  1-speed,
3-speed  1-speed, 3-speed  2-speed, or 4-speed  1-speed,
4-speed  2-speed, 4-speed  3-speed conforms with the shift
pattern.OKTEST 3
Correct
Carry out TEST 3 again.
Ye s
Check the Shifting point.Incorrect
Incorrect throttle cable adjustment

Governor malfunction

Line pressure malfunction

Low coast modulator valve malfunction
NG
Does the downshift from 2-speed to 1-speed occur?No
1 ± 2 shift valve malfunction

Governor malfunction
TEST 3
When traveling in 3-speed or 4-speed, release accelerator pedal
and shift to L. Check that 3-speed  2-speed or 4-speed  3-speed
takes place immediately and 2-speed  1-speed downshift con-
forms with shift pattern.OKTEST 4

AUTOMATIC TRANSMISSION ± Troubleshooting23-6
Ye s
Carry out TEST 4 again.
Ye s
Does the engine brake function in L range?NoBrake No. 3 malfunction
No
Does the engine brake function in 2 range?NoBrake No. 1 malfunction
TEST 4
When traveling in 3-speed or 4-speed, shift to 2 and L. Does the
engine brake function in each range?Ye sTEST 5
Ye s

High line pressure

Accumulator malfunction

Check ball malfunctionCarry out TEST 5 again.
TEST 5
Is there abnormal noise(s) during acceleration and deceleration?
Is there shocks when slipping and changing speed?NoTEST 6
Ye s

Incorrect torque converter installation

Oil pump malfunction

Shifting gear not meshing correctly

Incorrect drive plate installationCarry out TEST 6 again.
TEST 6
Is there abnormal noise(s) or vibration when traveling in 3-speed
or 4-speed?NoTEST 7
NOTE
Abnormal noises and vibrations are often caused by an unbalanced propeller shaft, differential, tyre,
torque converter, engine, etc. Extremely thorough inspection is therefore required.
Ye s
Carry out TEST 7 again.
Ye s
Does lock up go on, off?No
Lock up signal valve malfunction

Lock up relay valve malfunction

Lock up clutch malfunction
No
Does the moment when lock up turns ON or OFF conform with
the shift pattern?No
Governor malfunction

Line pressure malfunction
TEST 7
Check that lock up ON, OFF. Does the shifting points conform
with shift pattern?Ye sCarry out the road test in 2 range.
NOTE
(1) Determine the moment when lock up turns ON by decreased engine r/min or by a slight shock back
and forth.
(2) Determine the moment when lock up turns OFF by increased engine r/min.
(3) Check lock up condition by pumping the accelerator slightly. If engine r/min rises in accordance with
throttle valve opening size, determine that the lock up is OFF, if not, determine it ON.
(When lock up is OFF, drive power is transferred through the fluid in the torque converter and therefore,
when the accelerator pedal is depressed, slipping occurs inside the torque converter with a resulting
large increase in engine r/min.)

AUTOMATIC TRANSMISSION ± Troubleshooting23-7
2 RANGE TEST
Correct
Carry out TEST 1 again.
Ye s
Check the shifting point.Incorrect
Misadjusted throttle cable

Governor malfunction

Line pressure malfunction
No
Does the upshift from 1-speed to 2-speed occur?No
1 ± 2 shift valve malfunction

Governor malfunction
TEST 1
Start with throttle valve opening at 50% and full. Does the shifting
points conform with the shift pattern when upshifting from 1-speed

2-speed?Ye sTEST 2
Ye s
Carry out TEST 2 again.
NG
Does the downshift occur and is the shifting point correct?No
Detent regulator valve malfunction

Governor malfunction

Misadjusted throttle cable

1 ± 2 shift valve malfunction

Line pressure malfunction
TEST 2
Kickdown and check that possible kickdown vehicle speed limit
at 2-speed
1-speed conforms with shift pattern.OKCarry out road test in L range.
L RANGE TEST
No
Carry out road test in R range.
TEST 1
Does the transmission upshift to 2-speed?Ye s
Low coast modulator valve malfunction

Governor malfunction

Low line pressure
R RANGE TEST
Ye s
Carry out road test in P range.
TEST 1
Is the engine r/min by stall test correct?No
Brake No. 3 malfunction

Overdrive clutch or direct clutch malfunction

Overdrive one-way clutch malfunction

Low line pressure
P RANGE TEST
Ye s
End
TEST 1
Park vehicle on an incline (more than 5) and release parking
and service brakes. Does the vehicle move?No
Park mechanism malfunction

Misadjusted shift lever

AUTOMATIC TRANSMISSION ± On-vehicle Service23-19
CONVERTER STALL TEST 23100540138
In this test, the engine maximum speed when the
torque converter stalls with the shift lever in the
ªDº or ªRº range is measured to check operation
of the torque converter, starter and one-way clutch
and check holding performance of the transmission
clutch (including brake).
Caution
Do not stand in front or at rear of the vehicle
during this test.
(1) Check the transmission fluid level. The fluid
temperature should be at the level after normal
operation (70 ± 80
C). The engine coolant
temperature should also be at the level after
normal operation (80 ± 90
C).
(2) Apply chocks to the rear wheels (right and left).
(3) Mount an engine tachometer.
(4) Apply fully the parking and service brakes.(5) Start the engine.
(6) With the selector lever in the ªDº range, fully
depress the accelerator pedal and read off the
engine maximum speed.
Standard value:
2,100 ± 2,400 r/min <4G63>
2,300 ± 2,600 r/min <4D56>
NOTE
When doing so, do not keep the engine running
with throttle full open for more than 5 seconds.
If two or more stall tests are needed, place
the selector lever in the ªNº position and run
the engine at about 1,000 r/min to allow the
transmission fluid to cool before another stall
test.
(7) Place the selector lever in the ªRº range and
perform the test as above.
JUDGEMENT OF STALL TEST RESULTS
Stall speed in ªDº and ªRº range is equal to each other
but lower than the nominal value.(1) Engine output is low.
(2) Starter one-way clutch is faulty. (Faulty torque
converter is suspected if it is lower than nominal
by more than 600 r/min)
Stall speed in ªDº range is higher than nominal.(1) Overdrive clutch slipping
(2) Overdrive one-way clutch faulty
(3) Forward clutch slipping
(4) One-way clutch No. 2 faulty
(5) Low line pressure
Stall speed in ªRº range is higher than nominal.(1) Overdrive clutch slipping
(2) Overdrive one-way clutch faulty
(3) Direct clutch slipping
(4) Brake No. 3 slipping
(5) Low line pressure

ABS <4WD> ± Troubleshooting35C-8
Code No. 26 4WD position detection switchProbable cause
This code is output at the following times:
ABS-ECU determines that an open circuit exists in the 4WD detection switch system.
The free wheel engage switch is off and the 4WD detection switch is on at a vehicle
speed of 15km/h or more for 5 seconds or more.
Malfunction of wiring harness or connector

Malfunction of free wheel engage switch

Malfunction of 4WD indicator-ECU

Malfunction of 4WD position detection switch

Malfunction of ABS-ECU
No
OK
Check trouble symptom.NGCheck the harnesses between 4WD
position detection switch and the ABS-
ECU, and repair if necessary.
OKCheck the following connector.
C-64NG
Repair
OK
Check trouble symptom.NGReplace the ABS-ECU.
Ye s
Measure at ABS-ECU connec-
tor C-64.

Disconnect the connector
and measure at the harness
side.

Ignition switch ON

Transfer lever:2H

Voltage between 35 and
body earth
OK:System voltageNGCheck the following connector.
C-64NG
Repair
Does the 4WD indicator lamp operate
normally?
Trouble symptomMain causeRemedy
Even when the transfer shift lever is
in the º4Hº position, the 4WD front
wheel indicator lamp does not
illuminate.Broken harness wire between the 4WD
indicator-ECU and the free-wheel
engage switch, or broken earth wire
from the free wheel engage switchRepair the harness.
Free wheel engage switch is defective.Replace the switch.
Even when the transfer shift lever is
in the º4Hº position, the free wheel
differential indicator lamp does not
illuminate
Broken harness wire between the 4WD
indicator-ECU and the 4WD position
detection switchRepair the harness.
illuminate.Broken wire in the 4WD indicator-ECU
circuit4WD indicator-ECU inspection (Re-
fer to GROUP 22 ± 4WD indicator-
ECU.)
Free wheel differential indicator
lamp illuminates regardless of the
p
osition of the transfer shift lever
Short in the harness wire in the 4WD
position detection switch circuitRepair the harness.
position of the transfer shift lever.4WD position detection switch is
defective.Replace the switch.
Short in the ABS-ECU circuitReplace the ABS-ECU.
Short in the 4WD indicator-ECU circuit4WD indicator-ECU inspection (Re-
fer to GROUP 22 ± 4WD indicator-
ECU.)
No indicator is illuminatedPower circuit in the 4WD indicator-ECU
is defective.Repair the harness.
4WD indicator-ECU is defective.4WD indicator-ECU inspection (Re-
fer to GROUP 22 ± 4WD indicator-
ECU.)
NOTE
When checking a short in the ABS-ECU circuit, remove the ABS-ECU connector and check if the 4WD
indicator returns to normal. If it returns to normal, the ABS-ECU is defective. Furthermore, if the ABS-ECU
is normal, then the 4WD indicator-ECU will be defective.