Mitsubishi Montero (1998+). Manual - part 205

I - SYSTEM/COMPONENT TESTS 

1998 Mitsubishi Montero

         1998 ENGINE PERFORMANCE

         Mitsubishi - System & Component Testing

         Diamante, Eclipse, Galant, Mirage, Montero, Montero Sport,

         3000GT

         INTRODUCTION

NOTE:    Testing individual components does not isolate shorts or

         opens. Perform all voltage tests using a Digital

         Volt-Ohmmeter (DVOM) with minimum 10-megohm input impedance,

         unless stated otherwise in test procedure. Use ohmmeter to

         isolate wiring harness shorts or opens. Testing procedures

         not covered in this article require a scan tool. See

         G - TESTS W/CODES article.

         Before testing separate components or systems, perform basic

diagnostic procedures in F - BASIC TESTING article. Since many

computer-controlled and monitored components set a diagnostic trouble

code if they malfunction, also perform self-diagnostics in G - TESTS

W/CODES article.

         AIR INDUCTION SYSTEMS

         TURBOCHARGER

         Turbocharger Pressure Check

         1) Disconnect Black turbocharger pressure control hose at

wastegate solenoid valve, and plug valve nipple. Attach pressure gauge

to hose. Drive vehicle and accelerate engine, in 2nd gear, to 3500 RPM

or more. Check turbocharger pressure when pressure gauge stabilizes.

See TURBOCHARGER PRESSURE SPECIFICATIONS table.

         2) If pressure gauge reading is more than specified, check

wastegate actuator. See DTCs P1103 and P1104 in G - TESTS W/CODES

article. Replace wastegate actuator as required. If pressure gauge

reading is less than specified, check for malfunctioning wastegate

valve, turbocharger pressure leaks and faulty turbocharger.

TURBOCHARGER PRESSURE SPECIFICATIONS TABLE

Application                            Pressure psi (kg/cm



)

Eclipse  ................................  6.4-14.7 (.4-1.0)

3000GT  ...................................  2.9-8.7 (.2-.6)

         Air By-Pass Valve

         Remove air by-pass valve. Valve is mounted to intake air duct

between air-to-air intercooler and intake plenum. Apply vacuum to

diaphragm of vacuum valve. Valve should begin opening at approximately

16 in. Hg. Observe operation of valve through by-pass opening.

         Wastegate Actuator Test

         Actuator is mounted on turbocharger. For testing procedures,

see DTCs P1103 and P1104 in G - TESTS W/CODES article.

         Wastegate Control Solenoid Valve Test

         On Eclipse, valve is mounted to top back section of air

cleaner. On 3000GT, valve is mounted to firewall, beside EGR solenoid.

For testing procedures, see DTCs P1103 and P1104 in G - TESTS W/CODES

article.

         COMPUTERIZED ENGINE CONTROLS

         CONTROL UNIT

NOTE:    For Powertrain Control Module (PCM) location, see

         POWERTRAIN CONTROL MODULE (PCM) LOCATION table. To identify

         PCM power and ground terminals, see appropriate pin voltage

         chart in J - PIN VOLTAGE CHARTS article. To identify PCM

         power and ground circuits, see appropriate wiring diagram in

         L - WIRING DIAGRAMS article.

         Ground Circuits

         1) Turn ignition off. Using an ohmmeter, check continuity

between chassis ground and PCM ground terminal(s). See  Figs. 1-5.

Ohmmeter should indicate zero ohms. If reading is not as specified,

check and repair open circuit between PCM connector and chassis

ground. If reading is as specified, go to next step.

         2) Connect voltmeter negative lead to chassis ground. Connect

positive lead to PCM ground terminal(s). With engine running,

voltmeter should indicate less than one volt. If reading is more than

one volt, check for open, corrosion or loose connection in ground

circuit.

         Power Circuits

         Turn ignition on. Check for battery voltage on both PCM power

terminals. See Figs. 1-5. If battery voltage is not present, check

operation of MFI relay. See RELAYS under MOTORS, RELAYS & SOLENOIDS.

POWERTRAIN CONTROL MODULE (PCM) LOCATION TABLE

Application                                         Location

Eclipse 2.0L Non-Turbo  ..................  In Front Of Left

                                           Front Strut Tower

Mirage & Montero Sport  ..............  Behind Right Side Of

                                Instrument Panel (Glove Box)

Montero  ...........................  Right Front Kick Panel

All Other Models  ...................  Behind Center Console

Fig. 1:  Identifying PCM Terminals (Diamante)

Courtesy of Mitsubishi Motor Sales of America

Fig. 2:  Identifying PCM Terminals (Eclipse 2.0L Non-Turbo)

Courtesy of Mitsubishi Motor Sales of America

Fig. 3:  Identifying PCM Terminals (Eclipse 2.0L Turbo, 2.4L & Mirage)

Courtesy of Mitsubishi Motor Sales of America

Fig. 4:  Identifying PCM Terminals (Galant)

Courtesy of Mitsubishi Motor Sales of America

Fig. 5:  Identifying PCM Terminals (All Other Models)

Courtesy of Mitsubishi Motor Sales of America

         ENGINE SENSORS & SWITCHES

NOTE:    For circuit identification, see appropriate wiring diagram

         in L - WIRING DIAGRAMS article.

         Automatic Transaxle/Transmission Range Switch Or Park Neutral

         Position Switch

         See G - TESTS W/CODES article.

         Barometric Pressure Sensor

         Sensor is a part of volume airflow sensor assembly. See G -

TESTS W/CODES article.

         Closed Throttle Position Switch

         Switch is part of throttle position sensor. See CLOSED

THROTTLE POSITION (TP) SWITCH or THROTTLE POSITION (TP) SENSOR in G -

TESTS W/CODES article.

         Engine Coolant Temperature Sensor

         See G - TESTS W/CODES article.

         Heated Oxygen Sensor

         See G - TESTS W/CODES article.

         Intake Air Temperature (IAT) Sensor

         On all models except Eclipse 2.0L non-turbo and Mirage 1.5L,

IAT sensor is a part of volume airflow sensor assembly. On all models,

see G - TESTS W/CODES article.

         Manifold Absolute Pressure Sensor

         See G - TESTS W/CODES article.

         Manifold Differential Pressure Sensor

         See G - TESTS W/CODES article.

         Power Steering Oil Pressure (PSP) Switch

         On Eclipse 2.0L non-turbo, see DTC 115 in G - TESTS W/CODES -

NON-TURBO article. On all other models except Eclipse 2.0L non-turbo,

see G - TESTS W/CODES article.

         Throttle Position Sensor

         See G - TESTS W/CODES article.

         Vehicle Speed Sensor

         See G - TESTS W/CODES article.

         Volume Airflow Sensor

         See G - TESTS W/CODES article.

         MOTORS, RELAYS & SOLENOIDS

         MOTORS

         Idle Air Control Motor

         See G - TESTS W/CODES article.

         RELAYS

         ASD, Fuel Pump & MFI Relay

         See G - TESTS W/CODES article.

         Radiator Cooling Fan Control Relay (High & Low)

         See G - TESTS W/CODES article.

         SOLENOIDS

         EGR Control Solenoid Valve

         See EXHAUST GAS RECIRCULATION (EGR) under EMISSION SYSTEMS &

SUB-SYSTEMS.

         EVAP Purge Control Solenoid Valve

         See FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS.

         Fuel Pressure Regulator Control Solenoid Valve (Turbo Models)

         See FUEL DELIVERY under FUEL SYSTEM.

         Wastegate Control Solenoid Valve