1998 MITSUBISHI MONTERO ignition coil

Fig. 5: Power Transistor Connector Terminals (Mirage 1.8L)
Courtesy of Mitsubishi Motor Sales of America
2) Using an analog ohmmeter, check for continuity between
terminals No. 2 and 3 of power transistor. Continuity should exist.
With positive end of 1.5-volt battery disconnected, there should be no
continuity. Replace power transistor if it fails test.
DISTRIBUTORLESS IGNITION SYSTEM (DIS - V6)
Ignition Coil Resistance
1) On 3000GT DOHC, go to next step. On Montero and Montero
Sport, use DVOM to measure primary coil resistance between each
individual coil. To check secondary coil resistance, measure
resistance between towers of each individual coil. Replace coil if
primary and secondary coil resistances are not within specification.
See IGNITION COIL RESISTANCE (V6) table.
2) Using DVOM, measure primary coil resistance between
terminal No. 3 (power terminal) and each individual coil terminal. See\
Fig. 6 . Terminal No. 1 controls coil "B", terminal No. 2 controls coil
"A", and terminal No. 4 controls coil "C". See Fig. 7. To check
secondary coil resistance, measure resistance between towers of each
individual coil. Replace coil if primary and secondary coil

resistances are not within specification. See
IGNITION COIL RESISTANCE (V6) table.
IGNITION COIL RESISTANCE (V6) - Ohms @ 68
F (20C) TABLE








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Application Primary Secondary
3.0L
VIN J & K ............ .67-.81 ......... 11,300-15,300
VIN P ................ .74-.90 ......... 20,100-27,300
3.5L (VIN M) ........... .74-.90 ......... 20,100-27,300









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Fig. 6: Identifying Ignition Coil Terminals (3000GT DOHC)
Courtesy of Mitsubishi Motor Sales of America

Fig. 7: Identifying Ignition Coils (3000GT DOHC)
Courtesy of Mitsubishi Motor Sales of America
Power Transistor
1) To test section of power transistor that controls
cylinders No. 1 and 4 of ignition coil, disconnect power transistor
connector. Using a 1.5-volt dry cell battery, connect negative end of
1.5-volt battery to terminal No. 4 of power transistor and positive
end to terminal No. 3. See Fig. 8.
2) Using an analog ohmmeter, check for continuity between
terminals No. 4 and 13 of power transistor. Continuity should exist.
With positive end of 1.5-volt battery disconnected, there should be no
continuity. Replace power transistor if it fails test.
3) To test section of power transistor that controls
cylinders No. 2 and 5 of ignition coil, connect negative end of 1.5-
volt battery to terminal No. 4 of power transistor and positive end to
terminal No. 2.
4) Using an analog ohmmeter, check for continuity between
terminals No. 4 and 12 of power transistor. Continuity should exist.
With positive end of 1.5-volt battery disconnected, there should be no
continuity. Replace power transistor if it fails test.
5) To test section of power transistor that controls
cylinders No. 3 and 6 of ignition coil, connect negative end of 1.5-
volt battery to terminal No. 4 of power transistor and positive end to
terminal No. 1.
6) Using an analog ohmmeter, check for continuity between
terminals No. 4 and 11 of power transistor. Continuity should exist.
With positive end of 1.5-volt battery disconnected, there should be no
continuity. Replace power transistor if it fails test.
Fig. 8: Identifying Power Transistor Terminals
Courtesy of Mitsubishi Motor Sales of America

HALL EFFECT IGNITION
Ignition Coil Resistance
Using a DVOM, measure primary coil resistance between
specified coil terminals. See Figs. 9-12. On Galant, measure between
terminals No. 11 and 12. On Mirage measure between terminals No. 1 and
2. On all other vehicles, measure between positive and negative
terminals. Measure secondary coil resistance between coil positive
terminal and ignition coil tower. Primary and secondary coil
resistance should be within specification. See
IGNITION COIL RESISTANCE TABLE .
IGNITION COIL RESISTANCE TABLE - Ohms @ 68
F (20C)








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Application Primary Secondary
1.5L (VIN A) ........... .50-.70 ......... 15,000-22,000
2.4L (VIN G)
Galant .............. .90-1.20 ......... 20,000-29,000
Montero Sport ........ .67-.81 ......... 11,300-15,300
3.0L (VIN H) ........... .72-.88 ......... 12,290-13,920
3.5L (VIN P) ........... .50-.70 ........... 9000-13,000









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Fig. 9: Ignition Coil Connectors Terminals (Except DIS - Diamante)
Courtesy of Mitsubishi Motor Sales of America

Fig. 10: Ignition Coil Connectors Terminals (Except DIS - Galant)
Courtesy of Mitsubishi Motor Sales of America
Fig. 11: Ignition Coil Connectors Terminals (Except DIS - Mirage
1.5L)
Courtesy of Mitsubishi Motor Sales of America

Fig. 12: Ignition Coil Connectors Terminals (Except DIS - Montero
Sport 2.4L)
Courtesy of Mitsubishi Motor Sales of America
CAUTION: Power transistor test must be performed in less than 10
seconds to prevent coil from burning or power transistor
from breaking.
Power Transistor (Diamante)
1) Disconnect power transistor connector. Using a 1.5-volt
dry cell battery, connect negative end of 1.5-volt battery to terminal
No. 4 of power transistor and positive end to terminal No. 3. See
Fig. 13 .
2) Using an analog ohmmeter, check for continuity between
terminals No. 1 and 4 of power transistor. Continuity should exist.
With positive end of 1.5-volt battery disconnected, there should be no
continuity. Replace power transistor if it fails test.
Power Transistor (Galant)
1) Disconnect power transistor connector. Using a 1.5-volt
dry cell battery, connect negative end of 1.5-volt battery to terminal
No. 5 of power transistor and positive end to terminal No. 6. See
Fig. 14 .
2) Using an analog ohmmeter, check for continuity between
terminals No. 5 and 12 of power transistor. Continuity should exist.
With positive end of 1.5-volt battery disconnected, there should be no
continuity. Replace power transistor if it fails test.
Power Transistor (Mirage)
1) Disconnect power transistor (distributor) connector. Usin\
g
a 1.5-volt dry cell battery, connect negative end of 1.5-volt battery
to terminal No. 4 of power transistor and positive end to terminal No.
3. See Fig. 15.
2) Using an analog ohmmeter, check for continuity between
terminals No. 2 and 4 of power transistor. Continuity should exist.
With positive end of 1.5-volt battery disconnected, there should be no

* 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.

DTC P0155
Heated Oxygen Sensor (HO2S) heater circuit failure (bank 2,
sensor 1). Possible causes are: connector or harness, or HO2S.
DTC P0156
Heated Oxygen Sensor (HO2S) circuit failure (bank 2, sensor
2). Possible causes are: connector or harness, or HO2S.
DTC P0161
Heated Oxygen Sensor (HO2S) heater circuit failure (bank 2,
sensor 2). Possible causes are: connector or harness, or HO2S.
DTC P0170
Fuel trim failure (bank 1). Possible causes are: intake air
leaks, cracked exhaust manifold, faulty VAF sensor frequency, HO2S,
injector, fuel pressure, ECT, IAT or BARO pressure sensor.
DTC P0173
Fuel trim failure (bank 2). Possible causes are: intake air
leaks, cracked exhaust manifold, faulty VAF sensor frequency, HO2S,
injector, fuel pressure, ECT, IAT or BARO pressure sensor.
DTC P0201
Cylinder No. 1 injector circuit failure. Possible causes are:
connector or harness, or faulty injector.
DTC P0202
Cylinder No. 2 injector circuit failure. Possible causes are:
connector or harness, or faulty injector.
DTC P0203
Cylinder No. 3 injector circuit failure. Possible causes are:
connector or harness, or faulty injector.
DTC P0204
Cylinder No. 4 injector circuit failure. Possible causes are:
connector or harness, or faulty injector.
DTC P0205
Cylinder No. 5 injector circuit failure. Possible causes are:
connector or harness, or faulty injector.
DTC P0206
Cylinder No. 6 injector circuit failure. Possible causes are:
connector or harness, or faulty injector.
DTC P0300
Random misfire detected. Possible causes are: connector or
harness, faulty ignition coil, ignition power transistor, spark plug,
ignition circuit, injector, HO2S, compression pressure, timing belt,
air intake system, fuel pressure, or CKP sensor.
DTC P0301
Cylinder No. 1 misfire detected. Possible causes are:
connector or harness, faulty ignition coil, ignition power transistor,
spark plug, ignition circuit, injector, HO2S, compression pressure,
timing belt, air intake system, fuel pressure, or CKP sensor.
DTC P0302
Cylinder No. 2 misfire detected. Possible causes are:
connector or harness, faulty ignition coil, ignition power transistor,
spark plug, ignition circuit, injector, HO2S, compression pressure,
timing belt, air intake system, fuel pressure, or CKP sensor.