fuel pressure MITSUBISHI MONTERO 2000 Service Owners Manual

DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-48
Terminal
No.Normal condition: Inspection conditions (engine status) Check item
88Boost air temperature
sensorIgnition switch: ONIntake air temperature:
0_C3.2 - 3.8 V
Intake air temperature:
20_C2.3 - 2.9 V
Intake air temperature:
40_C1.4 - 2.0 V
Intake air temperature:
80_C0.4 - 1.0 V
89Crank angle sensorEngine: Idling (Use a digital voltage meter to check.)0V↔5V
(repeat the change)
90EGR valve position
sensor
Engine: After warm-
inguptheengine
Idling under no load2.3 - 3.3 V
sensoring up the engineEngine is suddenly racedMomentarily drops from
voltage during idling
91Parking switchIgnition switch: ON
(Enginestops)
Parking brake: ON0-1V
(Engine stops)Parking brake: OFFSystem voltage
CHECK CHART FOR RESISTANCE AND CONTINUITY
BETWEEN TERMINALS
1. Turn the ignition switch to LOCK (OFF) position.
2. Disconnect the engine-ECU connector.
3. Measure the resistance and check for continuity between
the terminals of the engine-ECU harness-side connector
while referring to the check chart.
NOTE
(1) When measuring resistance and checking continuity,
a harness for checking contact pin pressure should
be used instead of inserting a test probe.
(2) Checking need not be carried out in the order given
in the chart.
Caution
If the terminals that should be checked are mistaken,
or if connector terminals are not correctly shorted
to earth, damage may be caused to the vehicle wiring,
sensors, engine-ECU and/or ohmmeter.
Be careful to prevent this!
4. If the ohmmeter shows any deviation from the standard
value, check the corresponding sensor, actuator and
related electrical wiring, and then repair or replace.
5. After repair or replacement, recheck with the ohmmeter
to confirm that the repair or replacement has corrected
the problem.


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INTAKE AND EXHAUST -General Information/Service Specifications/Sealant15-3
At starting and driving at low speed, the duty control
value of the variable geometry solenoid valve is
increased to apply the vacuum pressure of the
vacuum pump to the variable geometry actuator.
Applying the vacuum pressure to the variable
geometry actuator pulls the actuator rod so that
it can move towards the direction of closing the
variable nozzle of the variable geometry
turbocharger. As closing the nozzle reduces the
exhaust gas mass, the speed of exhaust gas flow
will be increased and efficiency will be improved.
Since the characteristic of boost pressure becomes
a low speed type, boost pressure will suddenly
rise from low speed.
At driving at high speed, the duty control value
of the variable geometry solenoid valve is
decreased to reduce the vacuum pressure from
the vacuum pump so that the actuator rod can
return to the deactivated status and move towards
the direction of opening the nozzle of the variable
geometry turbocharger.Opening the nozzle allows the characteristic of
boost pressure to become a high speed type so
that the appropriate boost pressure can be
maintained.
Therefore, boost pressure can be controlled by
appropriate duty control of the variable geometry
solenoid valve. The engine-ECU calculates the
correct boost pressure based on the engine speed
and fuel injection amount. Furthermore, the duty
control of the variable geometry solenoid valve is
given feedback of the signals from the variable
geometry control pressure sensor and the boost
pressure sensor so that the variable nozzle opening
angle of the variable geometry turbocharger can
be quickly adjusted to obtain the desired boost
pressure.
SERVICE SPECIFICATIONS
ItemsStandard value
Variable geometry actuator activation vacuum
(Approximately 1 mm stroke) kPaApproximately 10.5 - 12.5
Variable geometry solenoid valve coil resistance
(at 20°C)Ω29 - 35
SEALANT
ItemSpecified sealantRemarks
Thread of the intake manifold mounting
bolts3M Stud Locking No.4170 or equivalentAnaerobic sealant


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AUTOMATIC TRANSMISSION -Troubleshooting 23-49
Inspection procedure 2
Starting not possible
Probable cause
If the enginewill not start when the selector lever is at the P or N position, the
cause is probably a malfunction of the inhibitor switch system, the transmission
control cable assembly, theenginesystem, the torque converter or the oil pump.DMalfunction of inhibitor switch system
DMalfunction of transmission control cable assembly
DMalfunction of enginesystem
DMalfunction of torque converter
DMalfunction of oil pump
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
LRefer to the Transmission Workshop Manual.
NG
Inspection Procedure 16: Inhibitor switch system check (Refer
to P.23-58.)NG
Repair or replace
OK
Torque converter check
DCheck for incorrect installation (inserted at an angle, etc.)
or damagedsplines.NGIf repair is possible, repair the damaged part.
If repair is not possible because the splines aredamaged,
replace the torque converter assembly.
OK
Replace the oil pumpassembly.
L
(The oilpump cannot be disassembled.)
Engine system check
DControl system, ignition system, fuel system, vehicle bodyNG
Repair
OK
Transmission control cable assembly checkNG
Repair OK
Check the trouble symptoms.Replace the engine-A/T-ECU or A/T-ECU.
Inspection procedure 3
Does not move forward
Probable cause
If the vehicle does not move forward when theengine is idling and theselector
lever is moved from N to D, 3, 2 or L, or if it is shifted to 1st or 2nd in Sports
mode, the cause is probably a problem with line pressure, or a malfunction of
the UD clutch or valve body.DAbnormal line pressure
DMalfunction of UD solenoid valve
DMalfunction of UD clutch system
DMalfunction of valve body
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
LRefer to the Transmission Workshop Manual.
MUT-
IIActuator Test
DNo.2 UD solenoid valve
OK:Sound of operation can be heardNGReplace the solenoid valve.
L
OK
Fluid pressure test (Refer to P.23-106.)
DMeasure the fluid pressure at each element in 1st in
Sportsmode
Standard value:Refer to P.23-106.NGDisassemble, clean and re-assemble the valve body.
L
DMake sure that the mounting bolts are not loose and that
the O-ring and valve body are notdamaged or positioned
incorrectly.
DIf the extent of thedamagelooks too bad for repairs to be
carried out, replace the valve body assembly.
OK
UD clutch system check
DRemove the transmission assembly, the valve body cover
and the valve body.
DBlow air through the UD clutch oilhole in the transmission
case, and check that the piston operates to maintain
pressure.
UD clutch check
L
DCheck for a problem such as burnt facing, poor piston
sealing or interference with the retainer.OKCheck the trouble symptoms. NG
Replace the engine-A/T-ECU or A/T-ECU.NG


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AUTOMATIC TRANSMISSION -Troubleshooting AUTOMATIC TRANSMISSION -Troubleshooting 23-51
Inspection procedure 5
Does not move (forward or reverse)
Probable cause
If the vehicle does not move forward or reverse when the selector lever is
moved to any position while the engine is idling, thecause is probably a
problem with line pressure or a malfunction of the oil pumps and valve bodies in
the power train.DAbnormal line pressure
DMalfunction of power train components
DMalfunction of oil pump
DMalfunction of valve body
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
LRefer to the Transmission Workshop Manual.
Fluid pressure test (Refer to P.23-106.)
DMeasure the fluid pressure at each element in 1st, 2nd
and reverse.
Standard value:Refer to P.23-106.OKCheck the power train components
L
DDisassemble the transmission and check the condition of
components such as the planetary carrier, output shaft and
differential.
NG
Replace the oil pumpassembly.
L
(The oilpump cannot be disassembled.)
Disassemble, clean and re-assemble the valve body.
L
DMake sure that the mounting bolts are not loose and that
the O-ring and valve body are notdamaged or positioned
incorrectly.
DIf the extent of thedamagelooks too bad for repairs to be
carried out, replace the valve body assembly.NG
NG
Check the trouble symptoms.
Replace the engine-A/T-ECU or A/T-ECU.
Inspection procedure 6
Engine stalls during shifting
Probable cause
If the enginestalls when the selector lever is moved from N to D or R while the
engine is idling, thecause is probably a malfunction of theenginesystem, DCC
solenoid valve, valve body, or torque converter (damper clutch).DMalfunction of enginesystem
DMalfunction of DCC solenoid valve
DMalfunction of valve body
DMalfunction of torque converter (malfunction of
damper clutch)
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
LRefer to the Transmission Workshop Manual.
Engine system check
DControl system, ignition system, fuel system, vehicle bodyNG
Repair or replace
OK
Replace the DCC solenoid valve.
L
Disassemble, clean and re-assemble the valve body.
L
DMake sure that the mounting bolts are not loose and that
the O-ring and valve body are notdamaged or positioned
incorrectly.
DIf the extent of thedamagelooks too bad for repairs to be
carried out, replace the valve body assembly.NGReplace the torque converter assembly.
Check the trouble symptoms.
Replace the engine-A/T-ECU or A/T-ECU.NG


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AUTOMATIC TRANSMISSION -Troubleshooting 23-57
Inspection procedure 14
Poor acceleration
Probable cause
If the vehicle does not accelerate after downshifting, the cause is probably a
malfunction of the enginesystem or of a brake or clutch.DMalfunction of enginesystem
DMalfunction of brake or clutch
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
LRefer to the Transmission Workshop Manual.
Engine system check
DControl system, ignition system, fuel system, vehicle bodyNG
Repair or replace
OK
Brake and clutch check
L
DCheck for a problem such as burnt facing, poor piston
sealing or interference with the retainer.Check the trouble symptoms.
Replace the engine-A/T-ECU or A/T-ECU.NG
Inspection procedure 15
Vibration
Probable cause
If vibration occurs when accelerating or decelerating while driving at a constant
speed or driving in top range, the cause is probably abnormal damper clutch
pressure, or a malfunction of theenginesystem, DCC solenoid valve, torque
converter or valve body.DAbnormal damper clutch pressure
DMalfunction of enginesystem
DMalfunction of DCC solenoid valve
DMalfunction of torque converter
DMalfunction of valve body
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
LRefer to the Transmission Workshop Manual.
NGReplace the DCC solenoid valve.
L
OK
Does the problem still occur when theengine coolant
temperature sensor is disconnected?YESEngine system check
DControl system, ignition system, fuel system, vehicle body
NO
Fluid pressure test (Refer to P.23-106.)
DMeasure the damper clutch fluid pressure.
Standard value:Refer to P.23-106.NGDisassemble, clean and re-assemble the valve body.
L
DMake sure that the mounting bolts are not loose and that
the O-ring and valve body are notdamaged or positioned
incorrectly.
DIf the extent of thedamagelooks too bad for repairs to be
carried out, replace the valve body assembly.
OK
Replace the torque converter assembly.Check the trouble symptoms.
Replace the engine-A/T-ECU or A/T-ECU.OK
MUT-
IIActuator Test
DNo. 6 DCC solenoid valve
OK:Sound of operation can be heard


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