oil temperature MITSUBISHI MONTERO 1998 Service Manual
[x] Cancel search | Manufacturer: MITSUBISHI, Model Year: 1998, Model line: MONTERO, Model: MITSUBISHI MONTERO 1998Pages: 1501, PDF Size: 25.81 MB
Page 84 of 1501
A/C-HEATER SYSTEM
1998 Mitsubishi Montero
1998 AIR CONDITIONING & HEAT
Mitsubishi - A/C-Heater System
Montero
* PLEASE READ THIS FIRST *
WARNING: To avoid injury from accidental air bag deployment, read and
carefully follow all SERVICE PRECAUTIONS and DISABLING &
ACTIVATING AIR BAG SYSTEM procedures in AIR BAG RESTRAINT
SYSTEM article.
A/C SYSTEM SPECIFICATIONS
A/C SYSTEM SPECIFICATIONS TABLE \
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Application Specification
Compressor Type ............... Nippondenso 10PA15 10-Cyl.
Compressor Belt Deflection ( 1)
New .......................... 13/64-15/64" (5.1-6.0 mm)
Used ......................... 17/64-19/64" (6.6-7.5 mm)
Compressor Oil Capacity ..................... ( 2) 2.7 ozs.
Refrigerant (R-134a) Capacity ................. 21-23 ozs.
System Operating Pressures ( 4)
High Side ............... 149-213 psi (10.5-15.0 kg/cm
)
Low Side .................... 14-33 psi (1.0-2.3 kg/cm)
( 1) - With 22 lbs. (100 N.m) force applied midway on longest
span of belt.
( 2) - Use ND 8-OIL refrigerant oil.
( 3) - Use SUN PAG 56 refrigerant oil.
( 4) - With ambient temperature at about 80
F (27C). \
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DESCRIPTION
Slight variations exist among manual A/C-heater systems used.
On Montero, a Nippondenso 10-cylinder compressor is used. Cycling of
compressor clutch is controlled by an automatic A/C Control Unit
(ACCU).
Compressors will only operate within normal temperatures and
pressures set for each model. An electric condenser fan operates
whenever A/C system is operating. System components may vary depending
upon model. Systems may include an ACCU, fan switch, evaporator,
temperature sensor, dual-pressure switch, engine coolant temperature
switch, compressor, condenser, receiver-drier and various pipes and
hoses.
OPERATION
A/C CONTROL UNIT (ACCU)
ACCU controls cycling of compressor clutch based on
information received from air thermosensor and air inlet sensor, dual-
pressure switch, A/C switch and A/C engine coolant temperature switch.
ACCU is attached to top of evaporator housing.
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With A/C switch in indicated position, ensure continuity
exists between listed terminals. See appropriate A/C SWITCH CONTINUITY
TEST table. See Fig. 2.
A/C SWITCH CONTINUITY TEST TABLE
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Switch Position Terminal No. Continuity
OFF ...................... ( 1) ...................... No
ECONO ................... 1 & 3 .................... Yes
A/C ................... 1, 3 & 4 ................... Yes
( 1) - Continuity should not exist between any terminals.
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Fig. 2: Identifying A/C Switch Terminals
Courtesy of Mitsubishi Motor Sales of America.
A/C ENGINE COOLANT TEMPERATURE SWITCH
1) Disconnect A/C engine coolant temperature switch
connector. Remove A/C engine coolant temperature switch. Carefully
heat a pan of oil and hold coolant temperature switch up to threads in
oil. Coolant switch is normally closed (continuity exists).
2) When oil reaches 235-243
F (112-118C), coolant switch
should open (no continuity). Replace A/C engine coolant temperature
switch if it does not test as specified. See Fig. 3.
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Removal & Installation
Discharge A/C system, using approved refrigerant
recovery/recycling equipment. Disconnect refrigerant temperature
sensor wiring connector. Remove temperature sensor from compressor. To
install, reverse removal procedure. Use new "O" ring on temperature
sensor.
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS TABLE \
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Application Ft. Lbs. (N.m)
A/C Compressor Bolt/Nut .................... 17-20 (23-27)
A/C Compressor Bracket Bolt/Nut .................. 37 (50)
A/C Compressor Clutch Coil Nut ................... 12 (16)
A/C Engine Coolant Temperature Switch ............ 26 (35)
INCH Lbs. (N.m)
Blower Motor Bolts/Nuts ........................... 44 (5)
Condenser Bolts/Nuts ............................ 106 (12)
Dual-Pressure Switch ............................. 89 (10)
Evaporator Assembly Bolts/Nuts .................... 44 (5)
Heater Assembly Bolts/Nuts ........................ 44 (5)
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WIRING DIAGRAMS
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Transportation (DOT) approved, DOT 4BW or DOT 4BA refrigerant
containers.
7) Never overfill refrigerant containers. The safe filling
level of a refrigerant container MUST NOT exceed 60 percent of the
container's gross weight rating. Store refrigerant containers at
temperature less than 125
F (52C).
8) R-134a refrigerant is sold and stored in 30- or 50-pound
Light Blue containers, while Freon (R-12) is stored in White colored
containers.
9) Refrigerant R-12 and R-134a must never be mixed, as they
and their desiccants and lubricants are not compatible. If
refrigerants are mixed, system cross-contamination or A/C system
component failure may occur. Always use separate servicing and
refrigerant recovery/recycling equipment.
10) Follow equipment manufacturer instructions of all service
equipment to be used. The Material Safety Data Sheet (MSDS), provided
by refrigerant manufacturer/suppliers, contains valuable information
regarding the safe handling of refrigerants.
11) Before connecting refrigerant lines always lubricate "O"
rings using appropriate refrigerant oil.
12) Always plug or cap A/C system refrigerant lines and
component connections as soon as possible to protect components from
moisture and/or dust. DO NOT remove plugs or caps until ready to
install component.
13) Always use a back-up wrench when tightening or loosening
fittings.
IDENTIFYING R-134a SYSTEMS & COMPONENTS
To prevent refrigerant cross-contamination, use following
methods to identify R-134a based systems and components.
Fittings & "O" Rings
All R-134a based A/C systems use 1/2" - 16ACME threaded
fittings (identifiable by square threads) and quick-connect service
couplings. See Fig. 1. Besides the use of these fittings, most
manufacturers will use Green colored "O" rings in R-134a systems.
Fig. 1: Identifying R-134a Fittings & Quick-Connect Service Couplings
Courtesy of Audi of America, Inc.
Underhood A/C Specification Labels
Most R-134a based systems will be identified through the use
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Other Means Of Identification
Refrigerant R-134a, when viewed through a sight glass, may
have a "milky" appearance due to the mixture of refrigerant and
lubricating oil. As the refrigerant and oil DO NOT exhibit a "clear"
sight glass on a properly charged A/C system, most R-134a systems have
no sight glass.
REFRIGERANT OILS
NOTE: Use ONLY the specified oil for the appropriate system or A/C
compressor. Always check vehicle underhood A/C specification
label or A/C compressor label before adding refrigerant oil
to A/C compressor/system. See Figs. 2 and 3. Always use
refrigerant oil specified on vehicle underhood A/C
specification label if different from the following list.
Refrigerant R-12 based systems use mineral oil, while R-134a
systems use Polyalkylene Glycol (PAG) oils. Using a mineral oil based
lubricant with R-134a will result in A/C compressor failure due to
lack of proper lubrication. The following R-134a refrigerant oils are
currently specified:
Use DENSO/ND-Oil 8 refrigerant oil on Nippondenso
compressors. Use SUN PAG 56 refrigerant oil on Sanden compressors.
NOTE: PAG oils absorb moisture very rapidly, 2.3-5.6 percent by
weight, as compared to a mineral oil absorption rate of
0.005 percent by weight.
SERVICE EQUIPMENT
A/C systems using R-134a refrigerant and PAG lubricants
cannot use R-12 refrigerant or mineral oil lubricants. R-134a
refrigerant is NOT compatible or interchangeable with R-12
refrigerant. Separate sets of hoses, manifold gauge sets and
recovery/recycling equipment are required to service the different
systems. This is necessary to avoid cross-contaminating and damaging
A/C system. A single set of A/C service equipment cannot be cleaned
thoroughly enough to be used with both types of refrigerant.
All equipment used to service A/C systems using R-134a must
be U.L. listed and certified to meet SAE standard J2210. The service
hoses on the manifold gauge set must have manual (turn wheel) or
automatic back-flow valves at the service port connector ends. This
will prevent refrigerant from being released into the atmosphere.
For identification purposes, R-134a service hoses must have a
Black stripe along its length and be clearly labeled SAE J2196/R-134a.
The low pressure test hose is Blue with a Black stripe. The high
pressure test hose is Red with a Black stripe, and the center test
hose is Yellow with a Black stripe.
R-134a manifold gauge sets can be identified by one or all of
the following: Labeled FOR USE WITH R-134a on set, labeled HFC-134a or
R-134a on gauge face, or by a Light Blue color on gauge face. In
addition, pressure/temperature scales on R-134a gauge sets are
different from R-12 manifold gauge sets.
SYSTEM SERVICE VALVES
SCHRADER-TYPE VALVES
NOTE: Although similar in construction and operation to a tire
valve, NEVER replace a Schrader-type valve with a tire valve.
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A/C SYSTEM SPECIFICATIONS
1998 Mitsubishi Montero
1998 AIR CONDITIONING & HEAT
Mitsubishi - A/C System Specifications
Montero
A/C SYSTEM SPECIFICATIONS
A/C SYSTEM SPECIFICATIONS TABLE \
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Application Specification
Compressor Type ............... Nippondenso 10PA15 10-Cyl.
Compressor Belt Deflection ( 1)
New .......................... 13/64-15/64" (5.1-6.0 mm)
Used ......................... 17/64-19/64" (6.6-7.5 mm)
Compressor Oil Capacity ..................... ( 2) 2.7 ozs.
Refrigerant (R-134a) Capacity ................. 21-23 ozs.
System Operating Pressures ( 4)
High Side ............... 149-213 psi (10.5-15.0 kg/cm
)
Low Side .................... 14-33 psi (1.0-2.3 kg/cm)
( 1) - With 22 lbs. (100 N.m) force applied midway on longest
span of belt.
( 2) - Use ND 8-OIL refrigerant oil.
( 3) - Use SUN PAG 56 refrigerant oil.
( 4) - With ambient temperature at about 80
F (27C). \
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this information to control solenoids on transmission valve body. TCM
controls transmission shifting and torque converter lock-up.
TCM contains a self-diagnostic system, which will store
Diagnostic Trouble Codes (DTC) if failure or problem exists in
electronic control system. DTC can be retrieved to determine problem
area. See SELF-DIAGNOSTIC SYSTEM. TCM is located under left side of
instrument panel, left of steering column. See Fig. 1.
TCM INPUT DEVICES
Brakelight Switch Signal
Brakelight switch delivers input signal to TCM, indicating
vehicle braking. Brakelight switch is located on brake pedal support.
Cruise Control Electronic Control Unit (ECU)
Cruise control ECU delivers an input signal to control
overdrive operation in accordance with vehicle speed when cruise
control is operating. When in overdrive with cruise control on, if
vehicle speed drops 2 MPH less than the set speed, overdrive is
released to prevent reduction in vehicle speed. Once vehicle speed is
more than the set speed, overdrive function is resumed. If coolant
temperature is low, transmission will not shift into overdrive. Cruise
control ECU is located below center A/C vent, behind temperature
control panel on Montero. On Montero Sport, cruise control ECU is
located behind driver's kick panel.
Engine Coolant Temperature Sensor (ECT) Signal
Engine coolant temperature sensor delivers input signal to
TCM, indicating engine coolant temperature. Coolant temperature sensor
is located on engine.
Input & Output Shaft Speed Sensors
Sensors are magnetic pick-ups that monitor input and output
shaft speeds. AC waveforms are input to TCM by sensors. Sensors are
located on front and rear side of transmission case.
OD Switch Signal
The OD switch provides an input signal to TCM to indicate
when overdrive is selected by operator. When OD switch is depressed to
ON position, transmission will shift into 4th gear when shift lever is
in "D" position, and OD OFF light on instrument panel will go off.
When OD switch is released to OFF position, transmission will shift
into 3rd gear, and OD OFF light on instrument panel will come on. The
OD switch is mounted on shift lever.
Oil Temperature Sensor Signal
Oil temperature sensor provides TCM with ATF temperature
values. TCM uses this information to control shift points for maximum
performance. If transmission oil temperature exceeds standard values,
instrument panel ATF - TEMP light will come on. Sensor is mounted to
cooler line at transmission.
Park/Neutral Position (PNP) Switch Signal
PNP switch delivers an input signal to TCM indicating shift
lever position. Switch is located on side of transmission.
Throttle Position (TP) Sensor Signal
TP sensor delivers closed throttle and variable throttle
position input signals to TCM. TP sensor is located on side of
throttle body.
4WD Low Range Detection Switch
4WD low range detection switch provides information to TCM
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Fig. 5: Retrieving Codes Using Scan Tool
Courtesy of Mitsubishi Motor Sales of America.
Retrieving Codes Using Oil Temperature Warning Light
1) Using jumper wire, ground DLC terminal No. 1. See Fig. 6.
Note number of flashes from oil temperature warning light on
instrument panel. See Fig. 7. If normal system operation exists, oil
temperature warning light will blink 2 times per second. See Fig. 8.
2) If system is operating correctly and no DTC exists, turn
ignition off and remove jumper wire. If DTC exists, oil temperature
warning light will flash once every 2 seconds. The number of flashes
will equal first digit of DTC. After a pause of 2 seconds, second
digit will be displayed. Oil temperature warning light will flash once
every half second for second digit. See Fig. 8.
3) If more than one DTC exists, next DTC will be displayed
after pause of 3 seconds. Smallest DTC number will be first. DTCs will
be repeated.
4) Once DTC is obtained, determine probable cause and
symptom. See DIAGNOSTIC TROUBLE CODE IDENTIFICATION table. To trouble
shoot DTC, see DIAGNOSTIC TESTS. Turn ignition off and remove jumper
wire.
NOTE: Once repairs have been performed, DTCs must be cleared from
TCM memory. See CLEARING DIAGNOSTIC TROUBLE CODES (DTC).
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![MITSUBISHI MONTERO 1998 Service Manual DIAGNOSTIC TROUBLE CODE IDENTIFICATION
DIAGNOSTIC TROUBLE CODE IDENTIFICATION \
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DIAGNOSTIC TROUBLE CODE IDENTIFICATION
DIAGNOSTIC TROUBLE CODE IDENTIFICATION \
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DTC ( 1) Probable Cause
11 ........................ Defective TP Sensor Or TP Sensor Circuit
15 ............................. Open Oil Temperature Sensor Circuit
16 ............................ Short Oil Temperature Sensor Circuit
21 ................................... Short Ignition Signal Circuit
22 .................................... Open Ignition Signal Circuit
23 .......................... Open Signal Line (ECT) From ECM To TCM\
24 ......................... Short Signal Line (ECT) From ECM To TCM\
29 ............................. Short Neutral Safety Switch Circuit
30 .............................. Open Neutral Safety Switch Circuit
31 ................................. Open No. 2 Speed Sensor Circuit
32 ................................. Open No. 1 Speed Sensor Circuit
41 ..................................... Open Solenoid No. 1 Circuit
42 .................................... Short Solenoid No. 1 Circuit
43 ..................................... Open Solenoid No. 2 Circuit
44 .................................... Short Solenoid No. 2 Circuit
47 ................................... Open Lock-Up Solenoid Circuit
48 .................................. Short Lock-up Solenoid Circuit
49 .............. ( 2) Torque Converter Clutch Engagement Malfunction
50 ........... ( 2) Torque Converter Clutch Disengagement Malfunction
51 ................................. 1st Gear Ratio Signal Incorrect
52 ................................. 2nd Gear Ratio Signal Incorrect
53 ................................. 3rd Gear Ratio Signal Incorrect
54 ................................. 4th Gear Ratio Signal Incorrect
( 1) - Check listed fault code and component for probable cause. See
appropriate fault code listing under DIAGNOSTIC TESTS. Check
wiring and connections of specified component.
( 2) - Scan tool is required for testing malfunctioning circuit.
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Fig. 6: Identifying Data Link Connector (DLC) Terminals
Courtesy of Mitsubishi Motor Sales of America.
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Once repairs have been performed, DTCs must be cleared from
TCM memory. DTCs may be cleared by disconnecting negative battery
cable for 10 seconds or more. Reconnect cable and ensure DTCs have
been cleared. Start engine and warm to normal operating temperature.
Run engine at idle for 10 minutes. DTCs may also be cleared using scan
tool. Refer to manufacturer's instruction manual.
DIAGNOSTIC TESTS
NOTE: For terminal and wire color identification, see WIRING
DIAGRAMS.
DTC 11: THROTTLE POSITION (TP) SENSOR
For diagnosis and testing information, see appropriate SELF-
DIAGNOSTICS article in ENGINE PERFORMANCE section. If TP sensor is
okay, check wiring harness and connectors between TP sensor and TCM.
Repair if necessary. If wiring harness and connectors are okay,
replace TCM.
DTC 15 & 16: OPEN OR SHORT IN OIL TEMPERATURE SENSOR CIRCUIT
1) Test oil temperature for proper operation. See OIL
TEMPERATURE SENSOR under COMPONENT TESTING. If oil temperature sensor
is okay, check wire harness, connectors and ground circuit for poor
connections or damage. Go to next step.
2) If wire harness and connectors are okay, check DTCs again
and verify code No. 15 or No. 16 still exists. If either code still
exists, replace TCM.
DTC 21 & 22: SHORT OR OPEN IN IGNITION SIGNAL CIRCUIT
1) Using an external tachometer, verify vehicles' tachometer
is operating accurately. If tachometer is incorrect, check ignition
coil and ignition power transistor and circuits for malfunction. See
appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE section.
2) If tachometer is okay, check TCM wire harness connector
for poor connection. If wire harness is okay, recheck DTCs. If codes
reappear check wire harness between ignition power transistor and TCM.
If wire harness is okay, replace TCM.
DTC 23 & 24: OPEN OR SHORT IN SIGNAL LINE (ECT) FROM ECM TO
TCM
Check wire harness, connectors and ground circuit for poor
connections or damage. Go to next step. If wire harness and connectors
are okay, check DTCs again and verify code No. 23 or No. 24 still
exists. If either code still exists, replace TCM.
DTC 29 & 30: SHORT OR OPEN IN PARK/NEUTRAL POSITION (PNP)
SWITCH CIRCUIT
1) Check PNP switch for correct operation. See. If PNP switch
is okay, disconnect switch connector and measure voltage between
harness connector terminal No. 1 and ground.
2) If battery voltage does not exist, check wire harness and
connectors. See WIRING DIAGRAMS. If battery voltage exists, check wire
harness and connectors between PNP switch and TCM. If wire harness is
okay, replace TCM.
DTC 31: INPUT SPEED SENSOR