1997 MITSUBISHI TRITON oil

ENGINE ELECTRICAL ± Ignition System16-34
WAVEFORM OBSERVATION POINTS
Point A: The height, length and slope of the spark line show the following trends (Refer to abnormal
waveform examples, 1, 2, 3 and 4).
Spark linePlug gapCondition of
electrodeCompression
forceConcentration of
air mixtureIgnition timingSpark plug
cable
LengthLongSmallNormalLowRichAdvancedLeak
ShortLargeLarge wearHighLeanRetardedHigh
resistance
HeightHighLargeLarge wearHighLeanRetardedHigh
resistance
LowSmallNormalLowRichAdvancedLeak
SlopeLargePlug is fouled±±±±
Point B: Number of vibration in reduction vibration section (Refer to abnormal waveform example 5)
Number of vibrationsCoil and condenser
Three or moreNormal
Except aboveAbnormal
Point C: Number of vibrations at beginning of dwell section (Refer to abnormal waveform example 5)
Number of vibrationsCoil
5 ± 6 or higherNormal
Except aboveAbnormal
Point D: Ignition voltage height (distribution per each cylinder) shows the following trends.
Ignition
voltagePlug gapCondition of
electrodeCompression
forceConcentration of
air mixtureIgnition timingSpark plug cable
HighLargeLarge wearHighLeanRetardedHigh resistance
LowSmallNormalLowRichAdvancedLeak

ENGINE ELECTRICAL ± Ignition System16-38
WAVEFORM OBSERVATION POINTS
Point A: The height, length and slope of the spark line (refer to abnormal waveform examples 1, 2,
3 and 4) show the following trends.
Spark linePlug gapCondition of
electrodeCompression
forceConcentration of
air mixtureIgnition timingHigh tension
cable
LengthLongSmallNormalLowRichAdvancedLeak
ShortLargeLarge wearHighLeanRetardedHigh
resistance
HeightHighLargeLarge wearHighLeanRetardedHigh
resistance
LowSmallNormalLowRichAdvancedLeak
SlopeLargePlug is fouled±±±±
Point B: Number of vibration in reduction vibration section
(Refer to abnormal waveform example 5)
Number of vibrationsCoil, condenser
3 or higherNormal
Except aboveAbnormal
Point C: Height of Zener voltage
Height of Zener voltageProbable cause
HighProblem in Zener diode
LowAbnormal resistance in
primary coil circuit

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 ± Troubleshooting23-6
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.)

L
in e p re ssu re k P a A
t id le 4
G 63 4
80 ± 5 58 7
35 ± 8 52 4
D 56 4
41 ± 5 00 6
08 ± 6 86 A
t s ta ll 4
G 63 1
019 ± 1 1 95 1
519 ± 1 911 4
D 56 1
098 ± 1 294 1
470 ± 1 863 (
1 ) Regula to r v a lv e fa ult y
( 2 ) Thro ttle v a lv e fa ult y
( 3 ) Thro ttle c o ntr o l c a ble in co rre ctly a dju ste d H
yd ra ulic p re ssu re lo w er th an n om in al in a ll r a nges (
1 ) Oil p um p fa ult y
( 2 ) Regula to r v a lv e fa ult y
( 3 ) Thro ttle v a lv e fa ult y
( 4 ) Thro ttle c o ntr o l c a ble in co rre ctly a dju ste d
( 5 ) Ove rd riv e c lu tc h fa ult y H
yd ra ulic p re ssu re lo w er th an n om in al in ª D º r a nge (
1 ) Larg e flu id le aks in ª D º r a nge h yd ra ulic c ir c u it
( 2 ) Forw ard c lu tc h fa ult y
( 3 ) Ove rd riv e c lu tc h fa ult y H
yd ra ulic p re ssu re lo w er th an n om in al in ª R º r a nge (
1 ) Larg e flu id le aks in ª R º r a nge h yd ra ulic c ir c u it
( 2 ) Bra ke N o. 3 fa ult y
( 3 ) Dir e ct c lu tc h fa ult y
( 4 ) Ove rd riv e c lu tc h fa ult y M
D998331 M
D998330

FRONT AXLE ± Service Specifications/Lubricants26-4
SERVICE SPECIFICATIONS26100030131
ItemStandard valueLimit
Front axle total backlash mm±11
Drive shaft axial play mm0.4 ± 0.7±
Solenoid valve resistance W36 ± 46±
Hub rotary sliding resistance N7 ± 26±
(Hub rotation starting torque) Nm0.5 ± 1.8±
Amount of movement of far the wheel bearing in an axial
direction mm0.05 or less±
Setting of D.O.J. boot length mm80 + 3±
Clutch gear play (bearing axial play) mm0.05 ± 0.30±
Drive gear backlash mm0.11 ± 0.16±
Differential gear backlash mm0 ± 0.076±
Drive pinion rotation torque NmWithout oil sealWhen replacing (with anti-rust agent)
0.3 ± 0.5±
When replacing or reusing (with gear oil
applied) 0.15 ± 0.25±
With oil sealWhen replacing (with anti-rust agent)
0.5 ± 0.7±
When replacing or reusing (with gear oil
applied) 0.3 ± 0.4±
Drive gear runout mm±0.05
Differential gear backlash mm±0.2
LUBRICANTS26100040141
ItemsSpecified lubricantsQuantity
Front differential gear oilHypoid gear oil API classification
GL-5 or higher SAE viscosity No. 90,
80W0.9

D.O.J. boot greaseRepair kit grease100 g

FRONT AXLE ± Drive Shaft26-29
INSPECTION26100360087

Check the boot for damage or deterioration.

Check the ball joint for operating condition and excessive
looseness.

Check the splines for wear or damage.

Check the differential carrier oil seal (L.H.) for damaged.