brake sensor MITSUBISHI MONTERO 1998 User Guide
Page 147 of 1501
Fig. 16: Locating Electronic Control Unit (ECU)
Courtesy of Mitsubishi Motor Sales of America.
"G" SENSOR
CAUTION: DO NOT turn "G" sensor upside-down or lay unit on its side.
DO NOT drop "G" sensor. DO NOT disassemble unit. Replace "G"
sensor as an assembly.
Removal & Installation
Sensor is located under center console, near shifter. See
Fig. 10 . Remove center console assembly. Disconnect sensor wiring
harnes s connector. Remove sensor. To install, reverse removal
procedure. Tighten bolts to specification. See TORQUE SPECIFICATIONS.
HYDRAULIC UNIT
Removal
Remove brakelines from hydraulic unit. Remove ABS relay box
cover. See Fig. 3. Disconnect ground wire and wiring harness
connectors from hydraulic unit. Remove hydraulic unit retaining nuts.
Carefully remove hydraulic unit.
Installation
To install, reverse removal procedure. Install hydraulic unit
brakelines. Ensure brakelines are installed in correct location. See
Fig. 17. Bleed brake system. See BLEEDING BRAKE SYSTEM.
Page 148 of 1501
Fig. 17: Identifying Hydraulic Unit Brakeline Connections
Courtesy of Mitsubishi Motor Sales of America.
WHEEL SPEED SENSOR (WSS)
Page 149 of 1501
Removal & Installation
Disconnect WSS connector. Remove WSS bolts. Remove WSS from
vehicle. To install, reverse removal procedure. Sensors are not
interchangeable. Adjust wheel WSS-to-rotor gap. See WHEEL SPEED SENSOR
(WSS) under ADJUSTMENTS. To complete installation, reverse removal
procedure. Tighten WSS bolts to specification. See
TORQUE SPECIFICATIONS .
WHEEL SENSOR ROTOR
Removal & Installation
Remove brake disc. Remove disc assembly. Remove wheel
bearings. Remove axle hub. Remove bolts attaching sensor rotor to hub
assembly. To install, reverse removal procedure.
OVERHAUL
HYDRAULIC UNIT
DO NOT attempt to overhaul or disassemble hydraulic unit. If
hydraulic unit is defective, replace entire assembly.
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS \
\
\
\
\
\
\
Application INCH Lbs. (N.m)\
"G" Sensor Mounting Bolt ................................. 80 (9.0)\
Wheel Speed Sensor (WSS) Bolt .................... 84-120 (9.5-14.6\
)
\
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WIRING DIAGRAMS
Page 153 of 1501
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
Page 163 of 1501
under COMPONENT TESTING. If lock-up solenoid is okay, go to next step.
If lock-up solenoid is bad, replace and retest system.
4) Check wiring harness and connectors between lock-up
solenoid and TCM. If wiring harness and connectors are okay, check TCC
engagement hydraulic pressure, valve body malfunction or TCC slipping.
DTC 50: TCC DISENGAGEMENT MALFUNCTION
1) Using scan tool, verify vehicle tachometer and scan tool
vehicle RPM values are identical. If tachometer values are identical,
go to next step. If tachometer values are different, test ignition
signal circuit. See DTC 21 & 22: SHORT OR OPEN IN IGNITION SIGNAL
CIRCUIT.
2) Lift and support vehicle to allow drive wheels to spin
freely. With transmission in "D" position, run engine to 1300-1900
RPM. Verify scan tool and speedometer read 31 MPH (50 km/h). If values\
are identical, go to next step. If values are different, test input
speed sensor. See DTC 31: INPUT SPEED SENSOR.
3) Check lock-up solenoid for proper operation. See SOLENOIDS
under COMPONENT TESTING. If lock-up solenoid is okay, go to next step.
If lock-up solenoid is bad, replace and retest system.
4) Check wiring harness and connectors between lock-up
solenoid and TCM. If wiring harness and connectors are okay, check
valve body malfunction or TCC sticking.
DTC 51: 1ST GEAR RATIO SIGNAL INCORRECT
1) If DTC 31 is set, go to DTC 31: INPUT SPEED SENSOR. If DTC
31 is not set and DTC 32 is set, go to DTC 32: OUTPUT SPEED SENSOR. If
neither DTC 31 nor DTC 32 is set, go to next step.
2) Test input speed sensor. See INPUT SPEED SENSOR under
COMPONENT TESTING. If resistance is as specified, go to next step. If
resistance is not as specified, replace input speed sensor and recheck
DTC. If DTC still exists, go to step 5).
3) Test output speed sensor. See OUTPUT SPEED SENSOR under
COMPONENT TESTING. If resistance is as specified, go to next step. If
resistance is not as specified, replace output speed sensor and
recheck DTC. If DTC still exists, go to step 5).
4) If referenced here from another DTC, go back to referenced
DTC. Check No. 2 one-way clutch system. See NO. 2 ONE-WAY CLUTCH in
MITSUBISHI R4AW3 & V4AW3 OVERHAUL article.
5) Check output speed sensor and No. 2 speed sensor shielding
wire. Repair as necessary. If shielding wire is okay, recheck DTC. If
DTC still exists, replace sensor rotor. If DTC still exists after
sensor rotor is replaced, check for interference noise and repair.
DTC 52: 2ND GEAR RATIO SIGNAL INCORRECT
If DTC 51 is set also, go to DTC 51: 1ST GEAR RATIO SIGNAL
INCORRECT test. If DTC 51 is not set, check 2nd brake and No. 1 one-
way clutch systems for a mechanical failure. See 2ND BRAKE and NO. 1
ONE-WAY CLUTCH in MITSUBISHI R4AW3 & V4AW3 OVERHAUL article.
DTC 53: 3RD GEAR RATIO SIGNAL INCORRECT
If DTC 51 is set also, go to DTC 51: 1ST GEAR RATIO SIGNAL
INCORRECT test. If DTC 51 is not set, check direct clutch system for a
mechanical failure. See DIRECT CLUTCH in MITSUBISHI R4AW3 & V4AW3
OVERHAUL article.
DTC 54: 4TH GEAR RATIO SIGNAL INCORRECT
Page 164 of 1501
If DTC 51 is set also, go to DTC 51: 1ST GEAR RATIO SIGNAL
INCORRECT test. If DTC 51 is not set, check overdrive brake for a
mechanical failure. See OVERDRIVE BRAKE in MITSUBISHI R4AW3 & V4AW3
OVERHAUL article.
SYMPTOM TROUBLE SHOOTING
NOTE: Check system using appropriate scan tool. See WIRING DIAGRAMS
for electrical schematics and COMPONENT TESTING.
COMMUNICATION WITH SCAN TOOL NOT POSSIBLE
If scan tool cannot communicate with TCM, check proper
connection with DLC. Check TCM power circuits, TCM ground circuits and
malfunctioning TCM.
SHIFT POINTS INCORRECT
If shift points are incorrect, check for DTCs. If no DTC is
present, check oil temperature sensor, pattern select switch, 4WD low
range detection switch and TCM for proper operation.
UPSHIFTS OCCUR SPONTANEOUSLY
If upshifting occurs spontaneously, check park/neutral
position switch, overdrive switch and TCM for proper operation.
TCC LOCK-UP MALFUNCTIONING
If TCC lock-up system is not operating properly, check torque
converter, valve body, lock-up switch and oil temperature switch.
COMPONENT TESTING
A/T FLUID TEMPERATURE SWITCH
1) Remove fluid temperature switch, located to rear of
neutral safety switch. Immerse switch in container of ATF up to top
threaded portion of switch. Using a DVOM, check continuity between
switch terminals. Continuity should not exist when fluid temperature
is 257
F (125C) or less.
2) When fluid is heated to 289-304F (143-151C), continuity
should exist. Replace switch if necessary. Apply thread sealant to
fluid temperature switch threads and install in transmission.
BRAKELIGHT SWITCH
1) Disconnect electrical connector from brakelight switch,
located near brake pedal. Using ohmmeter, ensure continuity exists
between terminal No. 2 (White/Red wire) and terminal No. 3 (Green
wire) with brake pedal released. Replace brakelight switch if
continuity does not exist. Continuity should not exist between
terminals No. 2 and No. 3 with brake pedal depressed.
2) If continuity does not exist, ensure brake pedal is
properly adjusted so brakelight switch has proper travel for switch
operation. If proper brakelight switch travel exists, replace
brakelight switch.
ENGINE COOLANT TEMPERATURE (ECT) SENSOR
Page 167 of 1501
Using a screwdriver, remove pattern select switch from
console. Switch is located at rear of selector lever, to right of
emergency brake handle. Using a DVOM, check continuity between pattern
select switch terminals No. 1 and 2, with switch in HOLD position.
Continuity should exist. With switch in POWER position, check
continuity between terminals No. 1 and 6. Continuity should exist. If
continuity is not as specified, replace switch. See Fig. 12.
Fig. 12: Identifying Pattern Select Switch Terminals
Courtesy of Mitsubishi Motor Sales of America.
SOLENOIDS
For solenoid testing, refer to the appropriate DTC under
DIAGNOSTIC TESTS. To check solenoid operation, apply battery voltage
to appropriate terminal of TCM connector and ground. Ensure operating
sound can be heard when battery voltage is connected. Replace solenoid
if operating sound cannot be heard.
THROTTLE POSITION (TP) SENSOR
For diagnostic and testing information, see appropriate SELF-
DIAGNOSTICS article in ENGINE PERFORMANCE section.
4WD LOW RANGE DETECTION SWITCH
For location and testing information on 4WD low range
detection switch, see appropriate article in AXLE SHAFTS & TRANSFER
CASES.
TCM PIN VOLTAGE CHARTS
Access TCM. See Fig. 1 or 2. Turn ignition on. Using DVOM,
Page 168 of 1501
backprobe TCM connector. See Fig. 13. Check voltage between designated
terminals on TCM connector and ground. See TCM TERMINAL VOLTAGE
SPECIFICATIONS table. Voltage should be as specified.
Fig. 13: Identifying TCM Terminals
Courtesy of Mitsubishi Motor Sales of America.
TCM TERMINAL VOLTAGE SPECIFICATIONS
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Terminal Circuit Condition Voltage
No.
\b
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1 Lock-Up Solenoid Lock-Up Clutch Engaged Battery
\b
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1 Lock-Up Solenoid Lock-Up Clutch 0 Volts
Disengaged
\b
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2 Back-Up Power Supply At All Times Battery
\b
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5 Brakelight Switch Brake Pedal Depressed 0 Volts
\b
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5 Brakelight Switch Brake Pedal Released Battery
\b
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8 TP Sensor Throttle Closed (Idle) .3-1.0
\b
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8 TP Sensor Throttle Wide Open 4.4-5.0
\b
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11 Neutral Safety Switch In "P" Position Battery
\b
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11 Neutral Safety Switch Except In "P" 0 Volts
\b
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12 Ground Engine Idling 0 Volts
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35 Output Speed Ignition Off 0 Volts
Sensor Gnd
\b
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35 Output Speed Ignition On 2.5 Volts
Sensor Gnd
\b
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36 Input Speed Sensor Gnd Ignition Off 0 Volts
\b
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36 Input Speed Sensor Gnd Ignition On 2.5 Volts
\b
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37 Overdrive OFF Signal (
1) Steady Driving @ Battery
31 MPH (50 km/h)
\b
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37 Overdrive OFF Signal (
1) Climbing Hill @ 0 - 1
31 MPH (50 km/h)
\b
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38 Engine Ign. Signal Engine @ 3000 RPM .3 - 3.0
\b
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39 Neutral Safety Switch In "D" Position Battery
\b
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39 Neutral Safety Switch Except In "D" 0 Volts
\b
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40 Neutral Safety Switch In "2" Position Battery
\b
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40 Neutral Safety Switch Except In "2" 0 Volts
\b
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41 HOLD Mode HOLD Mode Selected Battery
\b
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41 HOLD Mode HOLD Mode Not Selected 0 Volts
\b
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42 Overdrive Switch Overdrive ON 0 Volts
\b
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42 Overdrive Switch Overdrive OFF Battery
\b
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43 Output Speed Sensor Vehicle Stopped About 2.5
\b
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43 Output Speed Sensor Vehicle Moving Other Than
2.5
\b
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44 Input Speed Sensor Vehicle Stopped About 2.5
\b
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44 Input Speed Sensor Vehicle Moving Other Than
2.5
\b
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45 Coolant Temp Sensor Temp @ 86F (30C) 2.5
\b
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45 Coolant Temp Sensor Temp @ 158F (70C) 0 Volts
\b
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46 MIL Signal Ignition ON .5
4.5 Volts
\b
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(
1) - Test circuit with shift lever in "D" position, mode selector
normal and cruise control on.
\f
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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 171 of 1501
until brakelight plunger contacts brake pedal.
2) Loosen brakelight switch 1/2 to one turn. Install and
tighten lock nut on brakelight switch. Install electrical connector.
Ensure brakelights and cruise control operate properly.
INPUT SPEED SENSOR
Removal & Installation
Disconnect electrical connector. Remove bolt securing sensor
to transmission. Remove input speed sensor from transmission. See
Fig. 14 . To install, reverse removal procedure.
Fig. 14: Locating Input Speed Sensor
Courtesy of Mitsubishi Motor Sales of America.
OIL TEMPERATURE SENSOR
Removal & Installation
Sensor is located on transmission connected to cooler line,
near PNP switch. Disconnect electrical connector. Remove oil
temperature sensor from transmission. To install, reverse removal
procedure using NEW gasket.
OUTPUT SPEED SENSOR
Removal & Installation