engine coolant MITSUBISHI MONTERO 1998 User Guide
Page 170 of 1501
35 Output Speed Ignition Off 0 Volts
Sensor Gnd
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35 Output Speed Ignition On 2.5 Volts
Sensor Gnd
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36 Input Speed Sensor Gnd Ignition Off 0 Volts
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36 Input Speed Sensor Gnd Ignition On 2.5 Volts
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37 Overdrive OFF Signal (
1) Steady Driving @ Battery
31 MPH (50 km/h)
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37 Overdrive OFF Signal (
1) Climbing Hill @ 0 - 1
31 MPH (50 km/h)
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38 Engine Ign. Signal Engine @ 3000 RPM .3 - 3.0
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39 Neutral Safety Switch In "D" Position Battery
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39 Neutral Safety Switch Except In "D" 0 Volts
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40 Neutral Safety Switch In "2" Position Battery
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40 Neutral Safety Switch Except In "2" 0 Volts
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41 HOLD Mode HOLD Mode Selected Battery
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41 HOLD Mode HOLD Mode Not Selected 0 Volts
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42 Overdrive Switch Overdrive ON 0 Volts
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42 Overdrive Switch Overdrive OFF Battery
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43 Output Speed Sensor Vehicle Stopped About 2.5
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43 Output Speed Sensor Vehicle Moving Other Than
2.5
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44 Input Speed Sensor Vehicle Stopped About 2.5
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44 Input Speed Sensor Vehicle Moving Other Than
2.5
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45 Coolant Temp Sensor Temp @ 86F (30C) 2.5
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45 Coolant Temp Sensor Temp @ 158F (70C) 0 Volts
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46 MIL Signal Ignition ON .5
4.5 Volts
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1) - Test circuit with shift lever in "D" position, mode selector
normal and cruise control on.
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REMOVAL & INSTALLATION
BRAKELIGHT SWITCH
Removal & Installation
1) Disconnect electrical connector. Remove lock nut, and
unscrew brakelight switch. To install, screw brakelight switch inward
Page 208 of 1501
NOTE: Copied Vehicle Speed Sensors from Engine UIGs & added
Air Gap incorrect, loose, and wire lead misrouted. For
"contaminated" removed coolant & fuel examples from note.
SPEED SENSOR INSPECTION
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Condition Code Procedure
Air gap incorrect ....... B ....... (1) Require adjustment or
replacement.
Attaching hardware
missing ................ C .......... Require replacement of
hardware.
Attaching hardware
threads damaged ........ A ... Require repair or replacement
of hardware.
Attaching hardware
threads stripped
(threads missing) ...... A .. Require repair or replacement
of hardware.
Connector broken ........ A .. Require repair or replacement.
Connector (Weatherpack
type) leaking ........... A .. Require repair or replacement.
Connector melted ........ A ........... ( 2) Require repair or
replacement.
Connector missing ....... C ............ Require replacement.
Contaminated ............ A ........... ( 3) Require repair or
replacement.
Inoperative ............. B ........... ( 4) Require repair or
replacement. Further
inspection required.
Lead routing incorrect .. B ..... Require rerouting according
to vehicle manufacturer's
specifications.
Leaking ................. A .. Require repair or replacement.
Loose ................... A .. Require repair or replacement.
Missing ................. C ............ Require replacement.
Resistance out of
specification .......... B .. Require repair or replacement.
Sensor housing cracked .. 2 ............ Suggest replacement.
Terminal broken ......... A .. Require repair or replacement.
Terminal burned,
affecting performance .. A ........... ( 2) Require repair or
replacement.
Terminal burned, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal corroded,
affecting performance .. A .. Require repair or replacement.
Terminal corroded, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal loose,
affecting performance .. B .. Require repair or replacement.
Terminal loose, not
affecting performance .. 1 .. Suggest repair or replacement.
Threads damaged ......... A .. Require repair or replacement.
Threads stripped
(threads missing) ...... A ............ Require replacement.
Wire lead conductors
exposed ................ B .. Require repair or replacement.
Wire lead corroded ...... A .. Require repair or replacement.
Wire lead misrouted ..... B . Require re-routing according to
vehicle manufacturer's
Page 279 of 1501
Repair or replace components as necessary. If no problems exist, go to
next step.
2) Ground fan motor 3-pin connector terminal No. 3 (Black
wire). Using a fused jumper wire, connect battery voltage to 3-pin
connector terminal No. 2 (Blue wire). See WIRING DIAGRAMS. Fan motor
should operate with no abnormal noises or interferences. Repair or
replace components as necessary.
Engine Coolant Temperature (ECT) Sensor
Remove ECT sensor from vehicle. Suspend sensor in water so
that sensor does not touch container. Slowly heat water. Using an
ohmmeter, check sensor continuity as temperature increases. Replace
ECT sensor if resistance is not as specified. See
ENGINE COOLANT TEMPERATURE SENSOR RESISTANCE table.
ENGINE COOLANT TEMPERATURE SENSOR RESISTANCE
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Temperature F (C) Ohms
Diamante, Eclipse 2.0L Turbo & 2.4L
32 (0) ................................................. 5100-6500\
68 (20) ................................................ 2100-2700\
104 (40) ................................................ 900-1300\
176 (80) ................................................. 260-360\
Eclipse Non-Turbo
77 (25) ................................................. 900-1100\
212 (100) ................................................ 600-800\
Galant & Mirage
68 (20) ................................................ 2100-2700\
176 (80) ................................................. 260-360\
Montero
68 (20) ................................................ 2130-2610\
176 (80) ................................................. 258-322\
Montero Sport
68 (20) ................................................ 2100-2700\
176 (80) ................................................. 260-360\
3000GT
32 (0) ...................................................... 5800\
68 (20) ..................................................... 2400\
104 (40) .................................................... 1100\
176 (80) ..................................................... 300\
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Electric Cooling Fan Relay (Diamante, Eclipse, Galant &
Mirage)
1) Remove radiator fan motor relay from relay box located at
right side of engine compartment. Check for continuity between relay
terminals No. 1 and 3. If continuity exists, go to next step. If
continuity does not exist, replace cooling fan relay. See Fig. 8.
2) Using a fused jumper wire, connect battery voltage to
cooling fan relay terminal No. 1. Using another jumper wire, connect
cooling fan relay terminal No. 3 to battery ground. With cooling fan
relay energized, there should be continuity between cooling fan relay
terminals No. 4 and 5. With cooling fan relay not energized, there
should be no continuity between terminals No. 4 and 5. If continuity
does not exist as specified, replace cooling fan relay. See Fig. 8.
Electric Cooling Fan Relay (Montero, Montero Sport & 3000GT)
1)Remove relay from relay box in engine compartment relay
box. Check for continuity between relay terminals No. 2 and 4. If
continuity exists, go to next step. If continuity does not exist,
replace cooling fan relay. See Fig. 9.
2) Using a fused jumper wire, connect battery voltage to
Page 282 of 1501
speed, coolant temperature and A/C operation request, PCM
will command low, medium or high speed fan operation.
Diamante
1) If only the radiator fan does not operate, check fusible
link No. 6 located in engine compartment relay box. If only the
condenser fan does not operate, check dedicated fuse No. 16 (20-amp)
located in engine compartment relay box. See WIRING DIAGRAMS. Repair
as necessary.
2) If radiator fan and condenser fan operate in all speeds
except low, check appropriate low speed relay. See COMPONENT TESTS.
See WIRING DIAGRAMS . If low speed relay is okay, check PCM. See
appropriate G - TESTS W/CODES article in ENGINE PERFORMANCE.
* G - TESTS W/CODES - 1997
* G - TESTS W/CODES - 1998
3) If radiator fan and condenser fan operate in all speeds
except high, check appropriate high speed relay. See COMPONENT TESTS.
See WIRING DIAGRAMS . If high speed relay is okay, check PCM. See
appropriate G - TESTS W/CODES article in ENGINE PERFORMANCE.
* G - TESTS W/CODES - 1997
* G - TESTS W/CODES - 1998
4) To confirm radiator fan or condenser fan operation, see
FAN OPERATING MODE (DIAMANTE) table. If fan operation is not as
specified, check wiring harness for opens or shorts. Repair as
necessary.
FAN OPERATING MODE (DIAMANTE) ( 1)
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Power Circuit
Coolant Operating Radiator Condenser
Temp.
F (C) Low/High Fan Speed Fan Speed
13 MPH ( 2)
221 (105) ( 2) ........ On/Off ....... Low ................ Low
221 (105) ( 3) ........ Off/On ....... Mid ................ Mid
239 (115) ( 3) ........ On/On ........ High .............. High
13 MPH ( 3)
221 (105) ( 2) ........ On/Off ....... Low ................ Low
221 (105) ( 2) ........ On/On ........ High .............. High
30 MPH ( 2)
203 (95) ( 2) ........ Off/Off ....... Off ................ Off
203 (95) ( 3) ......... On/Off ....... Low ................ Off
221 (105) ( 3) ........ Off/On ....... Mid ................ Mid
30 MPH ( 3)
194 (90) ( 2) ........ Off/Off ....... Off ................ Off
194 (90) ( 3) ......... On/Off ....... Low ................ Off
221 (105) ( 3) ........ On/On ........ High ............... Mid
50 MPH ( 3)
221 (105) ( 2) ....... Off/Off ....... Off ................ Off
221 (105) ( 3) ........ On/On ........ High ............... Mid
( 1) - A/C request switch is turned off.
( 2) - Approximate vehicle speed/coolant temperature or less.
( 3) - Approximate vehicle speed/coolant temperature or more.
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NOTE: Operation of radiator and condenser fans is controlled by
vehicle Powertrain Control Module (PCM). Based on vehicle
speed, coolant temperature and A/C operation request, PCM
Page 283 of 1501
will command low, medium or high speed fan operation.
Eclipse
1) If only the radiator fan does not operate, check fusible
link No. 7 (20-amp) located in engine compartment relay box. If only
the condenser fan does not operate, check dedicated fuse No. 9 (20-
amp) located in engine compartment relay box. See WIRING DIAGRAMS.
Repair as necessary.
2) If radiator fan and condenser fan operate in all speeds
except low, check appropriate low speed relay. See COMPONENT TESTS.
See WIRING DIAGRAMS . If low speed relay is okay, check PCM. See
appropriate G - TESTS W/CODES article in ENGINE PERFORMANCE.
* G - TESTS W/CODES - 2.0L NON-TURBO - 1997
* G - TESTS W/CODES - 2.0L TURBO - 1997
* G - TESTS W/CODES - 2.4L - 1997
* G - TESTS W/CODES - 2.0L NON-TURBO - 1998
* G - TESTS W/CODES - 2.0L TURBO & 2.4L - 1998
3) If radiator fan and condenser fan operate in all speeds
except high, check appropriate high speed relay. See COMPONENT TESTS.
See WIRING DIAGRAMS . If high speed relay is okay, check PCM. See
appropriate G - TESTS W/CODES article in ENGINE PERFORMANCE.
* G - TESTS W/CODES - 2.0L NON-TURBO - 1997
* G - TESTS W/CODES - 2.0L TURBO - 1997
* G - TESTS W/CODES - 2.4L - 1997
* G - TESTS W/CODES - 2.0L NON-TURBO - 1998
* G - TESTS W/CODES - 2.0L TURBO & 2.4L - 1998
4) To confirm radiator fan or condenser fan operation, see
FAN OPERATING MODE (ECLIPSE NON-TURBO) or FAN OPERATING MODE (ECLIPSE\
2.0L TURBO & 2.4L) table. If fan operation is not as specified, check
wiring harness for opens or shorts. Repair as necessary.
FAN OPERATING MODE (ECLIPSE NON-TURBO)
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With A/T With M/T
Coolant Radiator Radiator Condenser
Temp.
F (C) Fan Speed Fan Speed Fan Speed
28 MPH ( 1) ( 2)
203 (95) ( 2) .......... Off ......... Off ................ Off
203-210 (95-99) ....... Mid ......... High ............... Off\
210 (99) ( 3) .......... High ........ High ............... Mid
28-50 MPH ( 1)
194 (90) ( 2) .......... Off ......... Off ................ Off
194-210 (90-99) ....... Mid ......... High ............... Off\
210 (99) ( 3) .......... High ........ High ............... Mid
50 MPH ( 1) ( 3)
210 (99) ( 2) .......... Off ......... Off ................ Mid
210 (99) ( 3) .......... High ........ High ............... Off
12 MPH ( 2) ( 4)
210 (99) ( 2) .......... Mid ......... High ............... Mid
210-242 (99-117) ...... High ........ High .............. High\
242 (117) ( 3) ......... High ........ High .............. High
12-50 MPH ( 4)
210 (99) ( 2) .......... Mid ......... High ............... Mid
210-242 (99-117) ...... High ........ High .............. High\
242 (117) ( 3) ......... High ........ High .............. High
50 MPH ( 3) ( 4)
210 (99) ( 2) .......... Mid ......... High ............... Mid
210-242 (99-117) ( 3) .. High ........ High .............. High
Page 284 of 1501
242 (117) (3) ......... High ........ High .............. High
( 1) - A/C request switch is turned off.
( 2) - Approximate vehicle speed/coolant temperature or less.
( 3) - Approximate vehicle speed/coolant temperature or more.
( 4) - A/C request switch is turned on.
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With A/T With M/T
Coolant Radiator Radiator Condenser
Temp.
F (C) Fan Speed Fan Speed Fan Speed
28 MPH ( 1) ( 2)
203 (95) ( 2) .......... Off ......... Off ................ Off
203-210 (95-99) ....... Low ......... Mid ................ Off\
210 (99) ( 3) .......... High ........ High ............... Mid
28-50 MPH ( 1)
194 (90) ( 2) .......... Off ......... Off ................ Off
194-210 (90-99) ....... Low ......... Mid ................ Off\
210 (99) ( 3) .......... High ........ High ............... Mid
50 MPH ( 1) ( 3)
210 (99) ( 2) .......... Off ......... Off ................ Off
210 (99) ( 3) .......... High ........ High ............... Mid
12 MPH ( 2) ( 4)
210 (99) ( 2) .......... Low ......... Mid ................ Mid
210-242 (99-117) ...... High ........ High .............. High\
242 (117) ( 3) ......... High ........ High .............. High
12-50 MPH ( 4)
210 (99) ( 2) .......... Low ......... Mid ................ Mid
210-242 (99-117) ...... High ........ High .............. High\
242 (117) ( 3) ......... High ........ High .............. High
50 MPH ( 3) ( 4)
210 (99) ( 2) .......... Low ......... Mid ................ Mid
210-242 (99-117) ( 3) .. High ........ High .............. High
242 (117) ( 3) ......... High ........ High .............. High
( 1) - A/C request switch is turned off.
( 2) - Approximate vehicle speed/coolant temperature or less.
( 3) - Approximate vehicle speed/coolant temperature or more.
( 4) - A/C request switch is turned on.
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NOTE: Operation of radiator and condenser fans is controlled by
vehicle Powertrain Control Module (PCM). Based on vehicle
speed, coolant temperature and A/C operation request, PCM
will command low, medium or high speed fan operation.
Galant
1) If only the radiator fan does not operate, check fusible
link No. 5 (30-amp) located in engine compartment relay box. If only
the condenser fan does not operate, check dedicated fuse No. 3 (30-
amp) located in engine compartment relay box. See WIRING DIAGRAMS.
Repair as necessary.
2) If radiator fan and condenser fan operate in all speeds
except low, check appropriate low speed relay. See COMPONENT TESTS.
See WIRING DIAGRAMS . If low speed relay is okay, check PCM. See
appropriate G - TESTS W/CODES article in ENGINE PERFORMANCE.
* G - TESTS W/CODES - 1997
* G - TESTS W/CODES - 1998
Page 285 of 1501
3) If radiator fan and condenser fan operate in all speeds
except high, check appropriate high speed relay. See COMPONENT TESTS.
See WIRING DIAGRAMS . If high speed relay is okay, check PCM. See
appropriate G - TESTS W/CODES article in ENGINE PERFORMANCE.
* G - TESTS W/CODES - 1997
* G - TESTS W/CODES - 1998
4) To confirm radiator fan or condenser fan operation, see
appropriate FAN OPERATING MODE (GALANT) table. If fan operation is not\
as specified, check wiring harness for opens or shorts. Repair as
necessary.
FAN OPERATING MODE (GALANT) ( 1)
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Coolant Radiator Condenser
Temp. F (C) Fan Speed Fan Speed
28 MPH ( 2)
203 (95) ( 2) ................ Off .......................... Off
203-221 (95-105) ............ Low .......................... Low\
221 (105) ( 3) .............. High ......................... High
28-50 MPH
194 (90) ( 2) ................ Off .......................... Off
194-221 (90-105) ............ Low .......................... Low\
221 (105) ( 3) .............. High ......................... High
50 MPH ( 3)
221 (105) ( 2) ............... Off .......................... Off
221 (105) ( 3) .............. High ......................... High
Any Speed ( 4)
221 (105) ( 2) ............... Low .......................... Low
221 (105) ( 3) .............. High ......................... High
( 1) - A/C request switch is turned off.
( 2) - Approximate vehicle speed/coolant temperature or less.
( 3) - Approximate vehicle speed/coolant temperature or more.
( 4) - A/C request switch is turned on.
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NOTE: Operation of radiator and condenser fans is controlled by
vehicle Powertrain Control Module (PCM). Based on vehicle
speed, coolant temperature and A/C operation request, PCM
will command low, medium or high speed fan operation.
Mirage
1) If only the radiator fan does not operate, check fusible
link No. 5 (30-amp) located in engine compartment relay box. If only
the condenser fan does not operate, check fusible link No. 2 (100-amp)\
and dedicated fuse No. 1 (25-amp) located in engine compartment relay
box. See WIRING DIAGRAMS . Repair as necessary.
2) If fusible links and dedicated fuse are okay, check
appropriate fan relay and/or fan motor for proper operation. See
COMPONENT TESTS. See WIRING DIAGRAMS. If fan relay and motor are okay,
check PCM. See appropriate G - TESTS W/CODES article in ENGINE
PERFORMANCE.
* G - TESTS W/CODES - 1.5L - 1997
* G - TESTS W/CODES - 1.8L - 1997
* G - TESTS W/CODES - 1998
3) To confirm radiator fan or condenser fan operation, see
appropriate FAN OPERATING MODE (MIRAGE) table. If fan operation is not\
as specified, check wiring harness for opens or shorts. Repair as
Page 286 of 1501
necessary.
FAN OPERATING MODE (MIRAGE)
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Power Circuit
Coolant Operating Radiator Condenser
Temp.
F (C) RAD/COND Fan Speed Fan Speed
203 (95) ( 1) ( 2) ...... Off/Off ....... Off ................ Off
203-221 (95-105) ( 1) ... On/Off ........ On ................ Off
221 (105) ( 1) ( 3) ...... On/On ......... On ................. On
All Temp. ( 4) .......... On/On ......... On ................. On
( 1) - A/C request switch is turned off.
( 2) - Approximate coolant temperature or less.
( 3) - Approximate coolant temperature or more.
( 4) - A/C request switch is turned on.
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NOTE: Operation of radiator and condenser fans is controlled by
vehicle Powertrain Control Module (PCM). Based on vehicle
speed, coolant temperature and A/C operation request, PCM
will command low, medium or high speed fan operation.
3000GT
1) If neither the radiator fan nor the condenser fan operate,
check fusible link No. 5 (40-amp). See WIRING DIAGRAMS. If only the
condenser fan does not operate, check dedicated fuse No. 8 (20-amp).
2) If the condenser fan operates in all speeds except low and
A/C compressor clutch does not enter the ON state, check for A/C
compressor lock controller unit output signal. If the A/C compressor
clutch does enter the ON state, check condenser fan low speed relay
operation.
3) If the radiator fan and the condenser fan operate in all
speeds except high, check PCM. See appropriate G - TESTS W/CODES
article in ENGINE PERFORMANCE. If fan operation is not as specified,
check wiring harness for opens or shorts. Repair as necessary.
* G - TESTS W/CODES - NON-TURBO - 1997
* G - TESTS W/CODES - TURBO - 1997
* G - TESTS W/CODES - 1998
4) To confirm radiator fan or condenser fan operation, see
appropriate FAN OPERATING MODE (3000GT) table. If fan operation is not\
as specified, check wiring harness for opens or shorts. Repair as
necessary.
FAN OPERATING MODE (3000GT)
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Power Circuit
Coolant Operating Radiator Condenser
Temp.
F (C) Low/High Fan Speed Fan Speed
50 MPH ( 1) ( 2)
203 (95) ( 2) ........ Off/Off ....... Off ................ Off
203-221 (95-105) ..... On/Off ....... Low ................ Off\
221 (105) ( 3) ........ On/On ........ High .............. High
50 MPH ( 1) ( 3)
221 (105) ( 2) ....... Off/Off ....... Off ................ Off
221 (105) ( 3) ........ On/On ........ High .............. High
All Speeds
221 (105) ( 2) ........ On/Off ....... Low ................ Low
221 (105) ( 3) ........ On/On ........ High .............. High
Page 332 of 1501
distributor.
2) Start engine and warm engine until engine temperature
coolant is 176-203
F (80-95 C). Turn engine off. Insert a paper clip
in engine speed detection connector terminal No. 3. See Fig. 1.
Connect a primary voltage detection-type tachometer to paper clip.
Fig. 1: Locating Engine Speed Detection Connector (Diamante)
Courtesy of Mitsubishi Motor Sales of America
3) Install a timing light. Start engine and allow it to idle.
Ensure engine curb idle speed is about 700 RPM. Curb idle speed is
automatically controlled by Idle Air Control (IAC) system. If curb
idle speed is not as specified, see DTC P0505 in G - TESTS W/CODES
article.
CAUTION: MFI system actuator test must be cancelled or test will
continue to run for 27 minutes. Driving vehicle under this
condition may damage engine.
4) Turn engine off. Connect scan tool to Data Link Connector
(DLC). DLC is located below left side of dash, near steering column.
See Fig. 2 . Start engine and allow it to idle. Using scan tool, select
MFI SYSTEM ACTUATOR TEST, then select item 17 (BASIC IGNITION TIMING).\
Press "Y" and read basic ignition timing value. See
IGNITION TIMING SPECIFICATIONS table. If basic ignition timing is
within specification, go to next step. If basic ignition timing is not
within specification, cancel MFI system actuator test. See DTC P0335
in G - TESTS W/CODES article.
5) Read actual ignition timing value. If actual ignition
timing is not within specification, cancel MFI system actuator test.
See DTC P0335 in G - TESTS W/CODES article.
Page 334 of 1501
coolant is 176-203 F (80-95 C). Turn engine off. Insert a paper clip
in engine speed detection connector. See Fig. 3. Connect a tachometer
to paper clip.
Fig. 3: Locating Engine Speed Detection Connector (3000GT - DOHC)
Courtesy of Mitsubishi Motor Sales of America
3) Install a timing light. Start engine and allow it to idle.
Using tachometer, read curb idle (RPM). Multiply RPM reading by 3 to
obtain actual curb idle speed. Ensure curb idle speed is 600-700 RPM.
Turn engine off. Curb idle speed is automatically controlled by Idle
Air Control (IAC) system. If curb idle speed is not as specified, see
DTC P0505 in G - TESTS W/CODES article.
4) Disconnect waterproof female connector from Brown ignition
timing check connector. See Fig. 4. Using a jumper wire, ground
ignition timing check terminal to read basic ignition timing. Using
timing light, read basic ignition timing value. See
IGNITION TIMING SPECIFICATIONS table. If basic ignition timing is
within specification, go to next step. If basic ignition timing is not
within specification, see DTC P0335 in G - TESTS W/CODES article.
5) Remove jumper wire to read actual ignition timing. Using
timing light, read actual ignition timing value. If actual ignition
timing is not within specification, see DTC P0335 in G - TESTS W/CODES
article.