check oil MITSUBISHI TRITON 1997 Owner's Manual

MPI ± Troubleshooting13A-56
INSPECTION PROCEDURE 48
Check ignition coil and power transistor unit circuit.
Check the ignition coil. (Refer to GROUP 16 ± Ignition System.)NG
Replace
OK
Check the power transistor unit.
(Refer to GROUP 16 ± Ignition System.)NG
Replace
OK
Measure at the power transistor unit connector A-70.

Disconnect the connector and measure at the harness side.
1. Voltage between 3 and earth (Ignition switch: ON)
OK: System voltage
2. Voltage between 1 and earth (Engine: Cranking)
OK: 2 ± 7 V1. OKCheck the following
connector. A-65NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire
between the engine-ECU
and the power transistor
unit, and repair if neces-
sary.NG
Repair
NG
As short circuit occurs between power transistor unit and combina-
tion meter (tachometer), check the harness wire, and repair if neces-
sary.
OK
Check the following connectors, and repair if necessary.
A-65, A-70NG
Check the harness wire between the power transistor unit and
ignition coil connector, and repair if necessary. 2. NG
Check the following
connector. C-49NG
Repair
OK
Check trouble symptom. OK
Measure at the power transistor unit connector A-70.

Disconnect the connector and measure at the harness side.

Disconnect the ignition coil connector.

Continuity between 3 and earth
OK: No continuity
OK
Replace the engine-ECU.

MPI ± Troubleshooting13A-60
Item
No.Reference
page Inspection
procedure
No. Normal condition Inspection contents Inspection
item
28A/C switchEngine: Idling
(when A/C switch isA/C switch: OFFOFFProcedure
No. 2913A-43
(
ON, A/C compressor
should be operating.)A/C switch: ONON
29Inhibitor
switch
Ignition switch: ONP or NP or NProcedure
No 27
13A-42
switch
D, 2, L or RD, 2, L or R
No. 27
41Injectors *3Engine: CrankingWhen engine cool-
ant temperature is
0C51 ± 76 ms
<4G63>
60 ± 90 ms
<4G64>±±
When engine
coolant temperature
is 20C26 ± 38 ms
<4G63>
30 ± 45 ms
<4G64>
When engine
coolant temperature
is 80C5.7 ± 8.5 ms
<4G63>
6.7 ± 10.1 ms
<4G64>
Injectors*4
Engine coolant
temperature:
80 ± 95C

Lamps and all
accessories: OFF
Engine is idling1.9 ± 3.1 ms
<4G63>
2.2 ± 3.4 ms
<4G64>
accessories: OFF

Transmission:
Neutral (A/T :
P range)2,500 r/min1.8 ± 3.0 ms
<4G63>
1.9 ± 3.1 ms
<4G64>
When engine is
suddenly racedIncreases
44Ignition coils
and power
Engine: After
having warmed upEngine is idling2±18BTDC±±
transistors
g

Timing lamp is set.
(The timing lamp
is set in order to
check actual
ignition timing.)2,500 r/min23 ± 43 BTDC
<4G63>
27 ± 47 BTDC
<4G64>

MPI ± Troubleshooting13A-68
Terminal No. Normal condition (Check condition)Inspection item
4±12Stepper motor coil (A1)28 ± 33 W (At 20
C)
17 ± 12Stepper motor coil (A2)
5±12Stepper motor coil (B1)
18 ± 12Stepper motor coil (B2)
6±12EGR control solenoid valve36 ± 44 W (At 20
C)
9±12Purge control solenoid valve36 ± 44 W (At 20
C)
13 ± Body earthEngine-ECU earthContinuity (0W)
26 ±Body earthEngine-ECU earth
35 ± 12Oxygen sensor heaterApprox. 12 W (At 20
C)
52 ± 72Intake air temperature sensor5.3 ± 6.7 kW (When intake air temperature is 0
C)
2.3 ± 3.0 kW (When intake air temperature is 20
C)
1.0 ± 1.5 kW (When intake air temperature is 40
C)
0.30 ± 0.42 kW (When intake air temperature is 80
C)
63 ± 72Engine coolant temperature sensor5.1 ± 6.5 kW (When coolant temperature is 0
C)
2.1 ± 2.7 kW (When coolant temperature is 20
C)
0.9 ± 1.3 kW (When coolant temperature is 40
C)
0.26 ± 0.36 kW (When coolant temperature is 80
C)
67 ± 72Idle position switchContinuity (when throttle valve is at idle position)
No continuity (when throttle valve is slightly open)
71 ±Body earthInhibitor switch Continuity (when select lever is at P or N)
No continuity (when select lever is at D, 2, L or R)

MPI ± On-vehicle Service13A-83
14. Stop the engine and check change of fuel pressure gauge
reading. Normal if the reading does not drop within 2
minutes. If it does, observe the rate of drop and
troubleshoot and repair according to the table below.
SymptomProbable causeRemedy
Fuel pressure drops gradually after
engine is stopped
Leaky injectorReplace injector
engine is sto ed
Leaky fuel regulator valve seatReplace fuel pressure regulator
Fuel pressure drops sharply
immediately after engine is stoppedCheck valve in fuel pump is held openReplace fuel pump
15. Release residual pressure from the fuel pipe line. (Refer
to P.13A-84.)
16. Remove the fuel pressure gauge and special tool from
the delivery pipe.
Caution
Cover the hose connection with rags to prevent splash
of fuel that could be caused by some residual pressure
in the fuel pipe line.
17. Replace the O-ring at the end of the fuel high pressure
hose with a new one. Furthermore, apply engine oil to
the new O-ring before replacement.
18. Fit the fuel high pressure hose over the delivery pipe
and tighten the bolt to specified torque.
Tightening torque: 5 Nm
19. Check for fuel leaks.
(1) Apply the battery voltage to the fuel pump drive
terminal to drive the fuel pump.
(2) Under fuel pressure, check the fuel line for leaks.

MPI ± Injector13A-93
REMOVAL SERVICE POINT
A
DELIVERY PIPE/INJECTOR REMOVAL
Remove the delivery pipe (with the injectors attached to it).
Caution
Care must be taken, when removing the delivery pipe,
not to drop the injector.
INSTALLATION SERVICE POINT

AINJECTOR/FUEL PRESSURE REGULATOR/
HIGH-PRESSURE FUEL HOSE INSTALLATION
(1) Apply a drop of new engine oil to the O-ring.
Caution
Be sure not to let engine oil in the delivery pipe.
(2) While turning the injector, high-pressure fuel hose and
fuel pressure regulator to the right and left, install the
delivery pipe, while being careful not to damage the O-ring.
After installing, check that the hose turns smoothly.
(3) If it does not turn smoothly, the O-ring may be trapped,
remove the fuel pressure regulator and then re-insert
it into the delivery pipe and check once again.
(4) Tighten the high-pressure fuel hose and fuel pressure
regulator to the specified torque.
Tightening torque:
9 Nm (Fuel pressure regulator)
5 Nm (High-pressure fuel hose)

INTAKE AND EXHAUST ±
Turbocharger and Exhaust
Manifold <4D56-4WD>15-14
OIL PIPE AND OIL RETURN PIPE CHECK15100650010
Check the oil pipe and oil return pipe for clogging, bending,
or other damage. If there is clogging, clean it.
EXHAUST MANIFOLD CHECK
15100340108
Damage or cracking of any part.

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.)

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.

BASIC BRAKE SYSTEM ± Troubleshooting35A-8
SymptomProbable causeRemedy
Insufficient parking brake functionWorn brake lining or padReplace
Grease or oil on lining or pad surface
Parking brake cable sticking
Stuck wheel cylinder or caliper piston
Excessive parking brake lever strokeAdjust the parking brake lever stroke or
check the parking brake cable routing
Auto adjuster malfunctionAdjust
Scraping or grinding noise when
brakes are applied
Worn brake lining or padReplace
brakes are a lied
Caliper to wheel interferenceCorrect or replace
Dust cover to disc interference
Bent brake backing plate
Cracked drums or brake disc
Squealing, groaning or chattering
noise when brakes are appliedDisc brakes ± Missing or damaged
brake pad anti-squeak shimReplace
Brake drums and linings, discs and pads
worn or scoredCorrect or replace
Improper lining parts
Disc brake ± Burred or rusted calipersCorrect or deburr
Dirty, greased, contaminated or glazed
liningsClean or replace
Drum brakes ± Weak, damaged or
incorrect shoe hold-down springs, loose
or damaged shoe hold-down pins and
springsCorrect or replace
Incorrect brake pedal or booster push rodAdjust