MITSUBISHI MONTERO 1998 Service Manual

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.

DTC P0303
Cylinder No. 3 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 P0304
Cylinder No. 4 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 P0305
Cylinder No. 5 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 P0306
Cylinder No. 6 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 P0325
Knock Sensor (KS) circuit failure. Possible causes are:
connector or harness, or faulty KS.
DTC P0335
Crankshaft Position (CKP) sensor circuit failure. Possible
causes are: connector or harness, or faulty CKP sensor.
DTC P0340
Camshaft Position (CMP) sensor circuit failure. Possible
causes are: connector or harness, or faulty CMP sensor.
DTC P0400
Exhaust Gas Recirculation (EGR) flow failure. Possible causes\
are: connector or harness, faulty EGR valve, EGR solenoid, EGR valve
control vacuum, or manifold differential pressure sensor.
DTC P0403
Exhaust Gas Recirculation (EGR) solenoid failure. Possible
causes are: connector or harness, or faulty EGR solenoid.
DTC P0420
Catalyst efficiency below threshold. Possible causes are:
cracked exhaust manifold, or faulty catalytic converter.
DTC P0421
Warm-up catalyst efficiency below threshold (bank 1).
Possible causes are: faulty exhaust manifold. If exhaust manifold is
okay, replace catalytic converter.
DTC P0431
Warm-up catalyst efficiency below threshold (bank 2).
Possible causes are: faulty exhaust manifold. If exhaust manifold is
okay, replace catalytic converter.
DTC P0442
Evaporative (EVAP) emission control system leak detected.
Possible causes are: connector or harness, faulty EVAP purge solenoid,

purge control valve, or vacuum hose routing.
DTC P0443
Evaporative (EVAP) purge control valve circuit failure.
Possible causes are: connector or harness, or faulty EVAP solenoid.
DTC P0446
Evaporative (EVAP) emission control system vent control
failure. Possible causes are: connector or harness, faulty EVAP vent
solenoid.
DTC P0450
Evaporative (EVAP) emission control system pressure sensor
failure. Possible causes are: connector or harness, or faulty fuel
tank differential pressure sensor.
DTC P0455
Evaporative (EVAP) emission control system large leak
detected. Possible causes are: connector or harness, faulty EVAP purge
solenoid, purge control valve, or vacuum hose routing.
DTC P0500
Vehicle Speed Sensor (VSS) failure. Possible causes are:
connector or harness, or faulty VSS.
DTC P0505
Idle Air Control (IAC) system failure. Possible causes are:
connector or harness, or faulty IAC motor.
DTC P0510
Closed Throttle Position (TP) switch failure. Possible causes\
are: connector or harness, or faulty closed TP switch.
DTC P0551
Power Steering Pressure (PSP) sensor failure. Possible causes\
are: connector or harness, or faulty PSP sensor.
DTC P0705
Automatic transaxle/transmission range sensor circuit
failure. Possible causes are: connector or harness, or faulty PNP
switch.
DTC P0710
Automatic transaxle/transmission fluid sensor failure.
Possible causes are: connector or harness, or faulty
transaxle/transmission sensor.
DTC P0715
Automatic transaxle input/turbine speed sensor circuit
failure. Possible causes are: connector or harness, or pulse
generator.
DTC P0720
Automatic transaxle input/turbine speed sensor circuit
failure. Possible causes are: connector or harness, or pulse
generator.
DTC P0725
Engine speed input circuit failure. Possible causes are:
connector or harness.
DTC P0740
Torque converter clutch system failure. Possible causes are:

connector or harness, or torque converter clutch solenoid.
DTC P0750
Shift solenoid "A" failure. Possible causes are: connector or
harness, or low-reverse solenoid.
DTC P0755
Shift solenoid "B" failure. Possible causes are: connector or
harness, or underdrive solenoid.
DTC P0760
Shift solenoid "C" failure. Possible causes are: connector or
harness, or second solenoid.
DTC P0765
Shift solenoid "D" failure. Possible causes are: connector or
harness, or overdrive solenoid.
DTC P1103
Turbocharger wastegate actuator failure. Possible causes are:
connector or harness, faulty wastegate solenoid or actuator, or vacuum
hose routing.
DTC P1104
Turbocharger wastegate solenoid failure. Possible causes are:
connector or harness, or faulty wastegate solenoid.
DTC P1105
Fuel pressure solenoid failure. Possible causes are:
connector or harness, or faulty fuel pressure solenoid.
DTC P1400
Manifold Differential Pressure (MDP) sensor circuit failure.
Possible causes are: connector or harness, or faulty MDP sensor.
DTC P1500
Generator FR terminal circuit failure. Possible causes are:
connector or harness.
DTC P1600
Serial communication link failure. Possible causes are:
connector or harness.
DTC P1715
Pulse Generator (PG) failure. Possible causes are: connector
or harness, or faulty PG.
DTC P1750
Solenoid failure. Possible causes are: connector or harness,
faulty converter clutch solenoid, shift control solenoid, or pressure
control solenoid.
DTC P0751
Automatic transaxle control relay failure. Possible causes
are: connector or harness, or automatic transaxle relay.
DTC P1791
Engine coolant temperature level input circuit (to TCM)
failure. Possible causes are: connector or harness.
DTC P1795
Throttle position input circuit failure. Possible causes are:
connector or harness.

CLEARING DTCS
CAUTION: When battery is disconnected, vehicle computer and memory
systems may lose memory data. Driveability problems may
exist until computer systems have completed a relearn cycle.
To clear DTCs using a scan tool, refer to owners manual
supplied with scan tool. If scan tool is not available, DTCs may also
be cleared by disconnecting negative battery cable or PCM for at least
15 seconds, allowing PCM to clear DTCs. Reconnect negative battery
cable and check for DTCs to confirm repair.
PCM LOCATION
PCM LOCATION TABLE








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Application Location
Montero ........................... Right Front Kick Panel
3000GT ............................. Behind Center Console









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SUMMARY
If no hard DTCs (or only pass DTCs) are present, driveability\
symptoms exist, or intermittent DTCs exist, proceed to H - TESTS W/O
CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START,
etc.) or intermittent diagnostic procedures.
TERMINAL IDENTIFICATION
NOTE: The following terminals are shown as viewed from component
side of connector. Vehicles are equipped with different
combinations of components. Not all components are used on
all models. To determine component usage, see appropriate
wiring diagram in L - WIRING DIAGRAMS article.
TERMINAL IDENTIFICATION DIRECTORY TABLE









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Connector See
ASD/Fuel Pump/MFI Relay ...................... Fig. 1 or 2
CKP/CMP Sensor ............................ Fig. 3, 4 or 5
DLC ............................................... Fig. 6
ECT Sensor ........................................ Fig. 7
EVAP Purge Solenoid ............................... Fig. 8
EVAP Vent Solenoid ................................ Fig. 9
Fuel Injector ....................... Fig. 10, 11, 12 or 13
Fuel Pump ................................... Fig. 14 or 15
Fuel Pump Control/Relay Module .................... Fig. 16
FTDP Sensor ...................................... Fig. 17
Generator Field .................................. Fig. 18
HO2S ............................................. Fig. 19
IAC Motor ........................................ Fig. 20
Ignition Coil .......................... Fig. 21, 22 or 23
Ignition Failure Sensor .......................... Fig. 24
Ignition Power Transistor .................. Fig. 25 or 26
KS ............................................... Fig. 27
MDP Sensor ....................................... Fig. 28
PCM .............................................. Fig. 29

PNP Switch ................................. Fig. 30 or 31
Starter Relay .................................... Fig. 32
TCM .............................................. Fig. 33
TP Sensor ........................................ Fig. 34
VAF Sensor ....................................... Fig. 35
VIC Valve Position Sensor ........................ Fig. 36
VSS .............................................. Fig. 37









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Fig. 1: ASD/Fuel Pump/MFI Relay Terminals (3000GT DOHC Turbo - Fuel
Pump)
Courtesy of Mitsubishi Motor Sales of America

Fig. 2: ASD/Fuel Pump/MFI Relay Terminals (All Other Models)
Courtesy of Mitsubishi Motor Sales of America

Fig. 3: Identifying CKP Terminals
Courtesy of Mitsubishi Motor Sales of America

Fig. 4: Identifying CMP Terminals (Montero & 3000GT DOHC)
Courtesy of Mitsubishi Motor Sales of America
Fig. 5: Identifying CMP Terminals (3000GT SOHC)
Courtesy of Mitsubishi Motor Sales of America

Fig. 6: Identifying DLC Terminals
Courtesy of Mitsubishi Motor Sales of America
Fig. 7: Identifying ECT Sensor Terminals
Courtesy of Mitsubishi Motor Sales of America