1998 MITSUBISHI MONTERO display

* PLEASE READ THIS FIRST *
NOTE: Self-diagnostics should be performed when cruise control
cancels without driver using normal cancel modes.
RETRIEVING CODES
1) Data Link Connector (DLC) is located to left of steering
column. Use analog voltmeter or scan tool for code retrieval. Follow
scan tool manufacturer's instructions.
2) Using an analog voltmeter, connect leads between cruise
control terminal and ground terminal of DLC. See Fig. 35. Count number
of deflections and pauses of voltmeter needle to determine trouble
code. Digit count is about 0.5 second per pulse and pause between
digits is about 2 seconds. Once trouble codes have been displayed, see
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION table.
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION TABLE









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Code Diagnostic Item
11 .............................. Vacuum Pump Drive System
12 ........................... Vehicle Speed Sensor Signal
14 ....................... Vacuum Pump Power Supply System
15 ................................. Cruise Control Switch
16 .................................... Cruise Control ECU
17 ....................... Throttle Position Sensor System









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Fig. 35: Identifying Data Link Connector Terminals
Courtesy of Mitsubishi Motor Sales of America
CLEARING CODES

1) To clear trouble codes, disconnect battery cable, or use
alternative method to prevent memory loss.
2) Turn ignition on. Turn main cruise control switch and SET
switch to ON position, and within one second, turn RES switch to ON
position. Hold stoplight switch and cruise control switch in ON
position for greater than 5 seconds. Verify codes are cleared.
DIAGNOSTIC TESTS
CODE 11: VACUUM PUMP DRIVE SYSTEM
Code 11 is displayed if release valve, control valve and
motor drive signals from vacuum pump are not input to cruise control
ECU. Probable causes are:
* Malfunction of vacuum pump.
* Malfunction of stoplight switch.
* Malfunction of connector.
* Malfunction of harness.
* Malfunction of cruise control ECU.
1) Check vacuum pump. See VACUUM PUMP TEST under COMPONENT
TESTS. If vacuum pump is defective, replace vacuum pump. If vacuum
pump is okay, go to next step.
2) Disconnect cruise control actuator harness connector A-57
or A-95. See Fig. 5. At harness side of connector, check voltage
between terminal No. 1 and ground. If battery voltage is present, go
to next step. If battery voltage is not present, check stoplight
switch. See BRAKELIGHT/STOPLIGHT SWITCH TEST under COMPONENT TESTS.
Replace switch if defective. Check cruise control main switch harness
connector C-01 and stoplight switch harness connector C-55. Repair as
necessary. If malfunction remains, check harness between cruise
control main switch and vacuum pump. Repair as necessary.
3) Disconnect cruise control ECU connector C-50. See Fig. 13.
At harness side of connector, check voltage between ground and
terminals No. 12 (driving release valve), No. 13 (driving control
valve), and No. 26 (driving motor). If battery voltage is present, go\
to next step. If battery voltage is not present, check and repair
connectors A-57 or A-95 and C-111 as necessary. See Figs. 5 and 24. If
malfunction remains, check and repair harness between vacuum pump and
cruise control ECU as necessary.
4) Check cruise control ECU connector C-50. Repair as
necessary. If malfunction remains, replace cruise control ECU.
CODE 12: VEHICLE SPEED SENSOR SIGNAL
Code 12 is displayed if vehicle speed signals from vehicle
speed sensor are not input to cruise control ECU when vehicle speed is
25 MPH or more. Probable causes are:
* Malfunction of VSS.
* Malfunction of connector.
* Malfunction of harness.
* Malfunction of cruise control ECU.
1) Check vehicle speed sensor. See VEHICLE SPEED SENSOR TEST
under COMPONENT TESTS. If speed sensor is okay, go to next step. If
speed sensor is defective, repair or replace as necessary.
2) Disconnect combination meter connector C-06. See Fig. 10.
At harness side of connector, with ignition switch in ON position,
measure voltage between terminal No. 1 and ground. If voltage is 4.5
volts or more, go to next step. If voltage is less than 4.5 volts,

check cruise control ECU connector C-50 and joint connector C-130.
Repair as necessary. See Figs. 13, 16 and 28. If malfunction remains,
check harness between combination meter (instrument cluster) and
cruise control ECU. Repair as necessary.
3) Disconnect combination meter connector C-04. See Fig. 9.
Check for continuity at harness side between terminal No. 43 and
ground. If continuity is present, go to next step. If continuity is
not present, check harness between combination meter and ground.
Repair as necessary.
4) Inspect combination meter connector C-04. If connector is
defective, repair as necessary. If connector is okay and malfunction
remains, replace cruise control ECU.
CODE 14: VACUUM PUMP POWER SUPPLY
Code 14 is displayed when drive signals for vacuum pump
release valve, control valve and motor are not input into cruise
control ECU. Probable causes are:
* Malfunction of stoplight switch.
* Malfunction of connector.
* Malfunction of harness.
* Malfunction of cruise control ECU.
1) Disconnect vacuum pump connector A-105. See Fig. 6. At
harness side of connector, check voltage between terminal No. 1 and
ground. If battery voltage is present, go to next step. If battery
voltage is not present, check stoplight switch. See
BRAKELIGHT/STOPLIGHT SWITCH TEST under COMPONENT TESTS. Replace as
necessary. If switch is okay, check connectors to combination meter,
stoplight switch and vacuum pump. Repair as necessary. If connectors
are okay and malfunction remains, check and repair circuit between
cruise control ECU and vacuum pump. If malfunction remains, replace
cruise control ECU.
2) Check connectors and circuit between cruise control ECU
and vacuum pump. See WIRING DIAGRAMS. Repair as necessary. If
connectors and circuit are okay, replace cruise control ECU.
CODE 15: CRUISE CONTROL SWITCH
Code 15 is displayed if RESUME switch or SET switch remains
on. Probable cause is malfunction of cruise control switch. Replace
cruise control switch.
CODE 16: CRUISE CONTROL ECU
Code 16 is displayed if there is an abnormality in CANCEL
hold circuit or microprocessor monitor circuit in cruise control ECU.
Probable cause is malfunction of cruise control ECU. Replace cruise
control ECU.
CODE 17: THROTTLE POSITION SENSOR
Code 17 is displayed if a voltage of 1.5 volts or more exists
when closed throttle position switch is ON or 0.2 volt or less exists
when closed throttle position switch is OFF for a continuous period of
4 seconds or more. Probable causes are:
* Malfunction of throttle position sensor.
* Malfunction of connector.
* Malfunction of harness.
* Malfunction of cruise control ECU.

ELECTROSTATIC DISCHARGE WARNING - BASIC INFORMATION
1998 Mitsubishi Montero
GENERAL INFORMATION
Electrostatic Discharge (ESD) Warning - Basic Information
All Makes amd Models
* PLEASE READ THIS FIRST *
NOTE: This article is intended for general information purposes
only.
INTRODUCTION
All Electrostatic Discharge (ESD) sensitive components
contain solid state circuits (transistors, diodes, semiconductors)
that may become damaged when contacted with an electrostatic charge.
The following information applies to all ESD sensitive devices. The
ESD symbol shown in Fig. 1 may be used on schematics to indicate which
components are ESD sensitive. See Fig. 1. Although different
manufactures may display different symbols to represent ESD sensitive
devices, the handling and measuring precautions and procedures are the
same.
Fig. 1: Sample ESD Symbol
HANDLING STATIC-SENSITIVE CIRCUITS/DEVICES

If equipped, the EMR light (some models may use a reminder
flag) reminds vehicle operator that an emission system maintenance is
required. This indicator is activated after a predetermined
time/mileage.
When performing a smog check inspection, ensure EMR indicator
is not activated. On models using an EMR light, light should glow when
ignition switch is turned to ON position and should turn off when
engine is running.
If an EMR flag is present or an EMR light stays on with
engine running, fail vehicle and service or replace applicable
emission-related components. To reset an EMR indicator, refer to
appropriate MAINTENANCE REMINDER LIGHTS in the MAINTENANCE section.
MALFUNCTION INDICATOR LIGHT (MIL)
The Malfunction Indicator Light (MIL) is used to alert
vehicle operator that the computerized engine control system has
detected a malfunction (when it stays on all the time with engine
running). On some models, the MIL may also be used to display trouble
codes.
As a bulb and system check, malfunction indicator light will
glow when ignition switch is turned to ON position and engine is not
running. When engine is started, light should go out.

* Load Value (Displayed As Percent)
* Engine Coolant Temperature
* Short Term Fuel Trim (Displayed As Percent)
* Long Term Fuel Trim (Displayed As Percent)
* MAP Vacuum
* Engine RPM
* Vehicle Speed Sensor
* DTC During Data Recording
SELF-DIAGNOSTIC SYSTEM
SERVICE PRECAUTIONS
Before proceeding with diagnosis, following precautions must
be observed:
* Ensure vehicle has a fully charged battery and functional
charging system.
* Visually inspect connectors and circuit wiring being worked
on.
* DO NOT disconnect battery or PCM. This will erase any DTCs
stored in PCM.
* DO NOT cause short circuits when performing electrical tests.
This will set additional DTCs, making diagnosis of original
problem more difficult.
* DO NOT use a test light in place of a voltmeter.
* When checking for spark, ensure coil wire is NOT more than
1/4" from chassis ground. If coil wire is more than 1/4" from
chassis ground, damage to vehicle electronics and/or PCM may
result.
* DO NOT prolong testing of fuel injectors. Engine may
hydrostatically (liquid) lock.
* When a vehicle has multiple DTCs, always repair lowest number
DTC first.
VISUAL INSPECTION
Most driveability problems in the engine control system
result from faulty wiring, poor electrical connections or leaking air
and vacuum hose connections. To avoid unnecessary component testing,
perform a visual inspection before beginning self-diagnostic tests.
ENTERING ON-BOARD DIAGNOSTICS
NOTE: DO NOT skip any steps in self-diagnostic tests or incorrect
diagnosis may result. Ensure self-diagnostic test applies to
vehicle being tested.
DTCs may be retrieved by using a scan tool only. Proceed to
DTC retrieval method.
NOTE: Although other scan tools are available, Mitsubishi
recommends using Multi-Use Tester II (MUT II) scan tool.
Using Scan Tool
1) Refer to manufacturer's operation manual for instructions
in use of scan tool. Before entering on-board diagnostics, see
SERVICE PRECAUTIONS . Locate Data Link Connector (DLC) under instrument
panel, near steering column.
2) Turn ignition switch to OFF position. Connect scan tool to
DLC. Turn ignition switch to ON position. Read and record scan tool
self-diagnostic output. Proceed to TROUBLE CODE DEFINITION.

PCM or performing resistance tests.
NOTE: Perform all resistance and voltage tests using a Digital
Volt-Ohmmeter (DVOM) with a minimum 10-megohm impedance,
unless stated otherwise in test procedures.
Using scan tool, display and record Diagnostic Trouble DTCs
(DTCs). See ENTERING ON-BOARD DIAGNOSTICS under SELF-DIAGNOSTIC
SYSTEM. If scan tool is blank, see SCAN TOOL WILL NOT COMMUNICATE. If
no DTCs are displayed, see H - TESTS W/O CODES article.
Clear DTCs. See CLEARING DTCS under SELF-DIAGNOSTIC SYSTEM.
Road test vehicle (if necessary) and attempt to duplicate conditions
that caused original complaint. Recheck for DTCs. If no DTCs are
displayed, go to INTERMITTENT DTCS. If one or more DTCs are displayed,
repair DTCs in order, starting with lowest numbered DTC. Clear DTCs
after each repair. Recheck for DTCs to confirm repair.
SCAN TOOL WILL NOT COMMUNICATE
NOTE: For terminal identification, see TERMINAL IDENTIFICATION. For
circuit and wire color identification, see
L - WIRING DIAGRAMS article.
1) Using DVOM, check voltage between Data Link Connector
(DLC) terminal No. 16 and chassis ground. If battery voltage does not
exist, check and repair junction connectors and wiring harness between
DLC and power supply.
2) If battery voltage exists, check for continuity between
DLC terminal No. 4 and chassis ground, and between DLC terminal No. 5
and chassis ground. If continuity does not exist, check and repair
wiring harness between DLC and chassis ground. If continuity exists,
go to next step.
3) Try a different scan tool adapter cable. If scan tool does
not communicate, try scan tool on a known-good vehicle. If scan tool
still does not communicate, replace scan tool.
INTERMITTENT DTCS
This procedure applies if you have been sent here from
diagnostic tests and have just attempted to simulate the condition
that initially set DTC. The following additional checks may assist in
identifying a possible intermittent problem:
* Visually inspect related wiring harness connectors for
broken, bent, pushed out or corroded terminals.
* Visually inspect related wiring harness for chafed, pierced
or partially broken wires.
* Check all pertinent technical service bulletins.
DTC P0100: VOLUME AIRFLOW (VAF) SENSOR CIRCUIT FAILURE
NOTE: For terminal identification, see TERMINAL IDENTIFICATION. For
circuit and wire color identification, see
L - WIRING DIAGRAMS article.
NOTE: Procedures are provided by manufacturer for component
testing using an engine analyzer with oscilloscope
capability. Refer to manufacturer's operation manual for
instructions in use of oscilloscope.
1) If using scan tool, go to step 3). Disconnect VAF sensor
connector. Install Test Harness (MB991348) between VAF sensor and
connector. Using engine analyzer with oscilloscope capability, connect

special patterns probe to VAF sensor connector terminal No. 3 or to
PCM connector terminal No. 61.
2) Start engine. Verify waveform high frequency and low
frequency patterns are of about the same length (time). Verify
wavelength decreases and frequency increases as engine RPM increases.
If conditions are not as specified, replace VAF sensor. If conditions
are as specified, go to step 4).
3) Warm vehicle to normal operating temperature. Ensure
headlights and accessories are off. Using scan tool, read VAF sensor
frequency value (item 12). See VOLUME AIRFLOW SENSOR VALUES table.
Frequency should increase when engine is raced. If values are not as
specified, replace VAF sensor. If values are as specified, turn
ignition switch to off position and disconnect VAF sensor connector.
Go to next step.
VOLUME AIRFLOW SENSOR VALUES TABLE









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Application Hz @ 700 RPM Hz @ 2500 RPM
Montero ................. 25-51 ................. 80-120
3000GT
DOHC
Non-Turbo ........... 24-50 ................. 71-111
Turbo ............... 26-52 ................. 93-133
SOHC .................. 21-47 .................. 57-97









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4) On 3000GT, go to next step. On Montero, disconnect MFI
relay connector. Using DVOM, check for continuity between VAF sensor
connector terminal No. 4 and MFI relay connector terminal No. 1. If
continuity does not exist, repair wiring harness as necessary. If
continuity exists, go to next step.
5) Using DVOM, check for continuity between chassis ground
and VAF sensor connector terminal No. 5. If continuity does not exist,
repair wiring harness as necessary. If continuity exists, go to next
step.
6) Ensure ignition switch is in OFF position. Disconnect PCM
connector. Ground PCM connector terminal No. 19. Using DVOM, check for
continuity between chassis ground and VAF sensor connector terminal
No. 7. If continuity does not exist, repair wiring harness as
necessary. If continuity exists, go to next step.
7) On 3000GT, go to next step. On Montero, ground PCM
connector terminal No. 61. Using DVOM, check for continuity between
chassis ground and VAF sensor connector terminal No. 3. If continuity
does not exist, repair wiring harness as necessary. If continuity
exists, turn ignition switch to ON position and go to step 9).
8) Turn ignition switch to ON position. Using DVOM, check
voltage between chassis ground and VAF sensor connector terminal No.
4. If battery voltage does not exist, repair wiring harness as
necessary. If battery voltage exists, go to next step.
9) Using DVOM, check voltage between chassis ground and VAF
sensor connector terminal No. 3. If voltage is not 4.8-5.2 volts,
replace PCM. If voltage is as specified, condition required to set DTC
is not present at this time. Go to next step.
10) Test is complete. Intermittent problem may exist. Road
test vehicle (if necessary) and attempt to duplicate conditions that
caused original complaint. Recheck for DTCs. If no DTCs are displayed,
go to INTERMITTENT DTCS .
DTC P0105: BAROMETRIC (BARO) PRESSURE SENSOR CIRCUIT FAILURE
NOTE: BARO pressure sensor is built into Volume Airflow (VAF)
sensor. For DTC P0105 test purposes, VAF sensor will be