1997 MITSUBISHI TRITON air condition

MPI ± Troubleshooting13A-58
Item
No.Reference
page Inspection
procedure
No. Normal condition Inspection contents Inspection
item
13Intake air
temperature
sensor
Ignition switch: ON or
with engine runningWhen intake air
temperature is ±20
C±20
CCode No.
1313A-12
sensorWhen intake air
temperature is 0
C0
C
When intake air
temperature is 20
C20
C
When intake air
temperature is 40
C40
C
When intake air
temperature is 80
C80
C
14Throttle
p
osition
Ignition switch: ONSet to idle position300 ± 1,000 mVCode No.
14
13A-13
osition
sensorGradually openIncreases in
proportion to
throttle opening
angle
14
Open fully4,500 ± 5,500 mV
16Power
supply
voltageIgnition switch: ONSystem voltageProcedure
No. 2313A-39
18Cranking
signal
(ignition
it h ST)
Ignition switch: ONEngine: StoppedOFFProcedure
No. 26
13A-41

13A-42
switch-ST)Engine: CrankingONProcedure
No. 27

21Engine
coolant
temperature
sensor
Ignition switch: ON or
with engine runningWhen engine
coolant temperature
is ±20
C±20
CCode No.
2113A-14
sensor
When engine
coolant temperature
is 0
C0
C
When engine
coolant temperature
is 20
C20
C
When engine
coolant temperature
is 40
C40
C
When engine
coolant temperature
is 80
C80
C

MPI ± Troubleshooting13A-65
Terminal No.Normal condition Check condition (Engine condition) Check item
35Oxygen sensor heaterEngine: Idling after warming up0±3V
Engine r/min: 5,000r/min.System voltage
36Engine warning lampIgnition switch: OFF
ON0 ± 3V
9 ± 13V
(After several seconds have
elapsed)
37Power steering fluid
pressure switchEngine: Idling after
warming upWhen steering
wheel is stationarySystem voltage
When steering
wheel is turned0±3V
38Control relay
(Power supply)
Ignition switch: OFFSystem voltage
(Power su ly)
Ignition switch: ON0±3V
45A/C switchEngine: Idle speedTurn the A/C
switch OFF0±3V
Turn the A/C
switch ON (A/C
compressor is
operating)System voltage
51Ignition switch ± STEngine: Cranking8V or more
52Intake air temperature
sensorIgnition switch:
ONWhen intake air
temperature is
0
C3.2 ± 3.8V
When intake air
temperature is
20
C2.3 ± 2.9V
When intake air
temperature is
40
C1.5 ± 2.1V
When intake air
temperature is
80
C0.4 ± 1.0V
56Oxygen sensorEngine: Running at 2,500 r/min after
warmed up (Check using a digital type
voltmeter)0
0.8V
(Changes repeatedly)
60Backup power supplyIgnition switch: OFFSystem voltage
61Sensor impressed
voltageIgnition switch: ON4.5 ± 5.5V
62Ignition switch ± IGIgnition switch: ONSystem voltage

MPI ± TroubleshootingMPI ± Troubleshooting13A-66
Terminal No.Normal condition Check condition (Engine condition) Check item
63Engine coolant
temperature sensorIgnition switch:
ONWhen engine
coolant tempera-
ture is 0C3.2 ± 3.8V
When engine
coolant tempera-
ture is 20C2.3 ± 2.9V
When engine
coolant tempera-
ture is 40C1.3 ± 1.9V
When engine
coolant tempera-
ture is 80C0.3 ± 0.9V
64Throttle position
sensorIgnition switch:
ONSet throttle valve
to idle position0.3 ± 1.0V
Fully open throttle
valve4.5 ± 5.5V
65Barometric pressure
sensorIgnition switch:
ONWhen altitude is
0m3.7 ± 4.3V
When altitude is
1,200m3.2 ± 3.8V
66Vehicle speed sensor
Ignition switch: ON

Move the vehicle slowly forward0
5V
(Changes repeatedly)
67Idle position switchIgnition switch:
ONSet throttle valve
to idle position0±1V
Slightly open
throttle valve4V or more
68Top dead centre sensorEngine: Cranking0.4 ± 3.0V
Engine: Idle speed0.5 ± 2.0V
69Crank angle sensorEngine: Cranking0.4 ± 4.0V
Engine: Idle speed1.5 ± 2.5V
70Air flow sensorEngine: Idle speed2.2 ± 3.2V
Engine r/min: 2,500r/min
71Inhibitor switch Ignition switch:
ONSet selector lever
to P or N0±3V
Set selector lever
to Other than P or
N8 ± 14V

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)

ENGINE COOLING ±
General Information/
Service Specifications/Lubricant/Sealants14-2
GENERAL INFORMATION14100010125
The cooling system is designed to keep every part
of the engine at appropriate temperature in
whatever condition the engine may be operated.
The cooling method is of the water-cooled, pressure
forced circulation type in which the water pump
pressurizes coolant and circulates it throughout the
engine. If the coolant temperature exceeds the
prescribed temperature, the thermostat opens to
circulate the coolant through the radiator as well
so that the heat absorbed by the coolant may be
radiated into the air.The water pump is of the centrifugal type and is
driven by the drive belt from the crankshaft.
The radiator is the corrugated fin, down flow type.
ItemsSpecifications
RadiatorPerformance kJ/h4G63 114,700
4G63 126,800
4G64, 4D56 <2WD>170,000
4D56 <4WD>227,300
Automatic transmission oil coolerPerformance kJ/h4G63 6,400
4D56 6,300
SERVICE SPECIFICATIONS14100030121
ItemsStandard valueLimit
High pressure valve opening pressure of radiator cap kPa75 ± 10565
Range of coolant antifreeze concentration of radiator %30 ± 60±
ThermostatValve opening temperature of thermostat
C82 + 1.5±
Full-opening temperature of thermostat
C95±
Valve lift (at 95
C) mm4G6, 4D56 <4WD>8.5 or more±
4D56 <2WD>8 or more±
LUBRICANT14100040100
ItemsQuantity

HIGH QUALITY ETHYLENE GLYCOL ANTIFREEZE COOLANT4G637.4
4G64, 4D56 <2WD>7.7
4D56 <4WD>7.8
SEALANTS14100050110
ItemsSpecified sealantRemarks
Cylinder block drain plug3M Nut Locking Part No. 4171 or equivalentDrying sealant
Water by-pass fitting <4G6>Mitsubishi Genuine Parts No. MD970389 or
equivalentSemi-drying sealant

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

ABS <2WD> ± Troubleshooting35B-18
Inspection Procedure 7
Brake operation is abnormal.
Probable cause
This varies depending on the driving conditions and the road surface conditions, so
problem diagnosis is difficult. However, if a normal diagnosis code is displayed, carry
out the following inspection.
Improper installation of wheel speed sensor

Incorrect sensor harness contact

Foreign material adhering to wheel speed sensor

Malfunction of wheel speed sensor

Malfunction of rotor

Malfunction of wheel bearing

Malfunction of hydraulic unit

Malfunction of ABS-ECU
OK
Check trouble symptom.NGReplace the ABS-ECU.
OK
Check the following connector.
C-62NG
Repair
NG
Measure at ABS-ECU connector C-62.

Disconnect the connector and
measure at the harness side.

Resistance value between terminals
10-23, 7-20, 8-21 and 9-22
OK:1.2 ± 1.4 kW
(The sensor harness and connector
should be moved while these
inspections are carried out.)NG
Repair
OK
Check trouble symptom.
OK
Check the following connectors.
A-01, A-07, F-01, F-16, D-01, and C-02NG
Repair
OK
Wheel bearing check. (Refer to GROUP
26 and 27 ± On-vehicle Service.)NG
Repair
OK
Rotor check. (Refer to P.35B-40.)NGReplace the rotor.
OK
Hydraulic unit check. (Refer to P.
35B-26.)
OK
Wheel speed sensor output voltage
check. (Refer to P. 35B-24.)NGWheel speed sensor check. (Refer to
P. 35B-39.)NGReplace the wheel speed sensor.
Wheel speed sensor installation check.NG
Repair