Engine Controls - System/component Tests - 2.0L Turbo: Other Mitsubishi Eclipse II

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»(ref-19155-S07117629462000123000000) table.
2. If pressure gauge reading is more than specified, check wastegate actuator. See DTC P1103 and P1104 in «TESTS W/CODES - 2.0L TURBO»(ref-19156) 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 Application Pressure psi (kPa) Eclipse 6.4-14.7 (44-101)

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.

Variable Induction Control System

VIC motor is mounted on front of intake plenum. For testing procedures, see DTC P1100 in TESTS W/CODES - 2.0L TURBO article.

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 PIN VOLTAGE CHARTS - 2.0L TURBO article. To identify PCM power and ground circuits, see WIRING DIAGRAMS .

Scheme 1

1. Turn ignition off. Using an ohmmeter, check continuity between chassis ground and PCM ground terminal(s). (Scheme 1) 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. (Scheme 1) If battery voltage is not present, check operation of MFI relay. See RELAYS under MOTORS, RELAYS & SOLENOIDS.

POWERTRAIN CONTROL MODULE (PCM) LOCATION

ENGINE SENSORS & SWITCHES

Note. For circuit identification, see appropriate wiring diagram in WIRING DIAGRAMS section.

BAROMETRIC PRESSURE SENSOR

Sensor is a part of volume airflow sensor assembly. See TESTS W/CODES - 2.0L TURBO article.

CLOSED THROTTLE POSITION SWITCH

Switch is part of throttle position sensor. See CLOSED THROTTLE POSITION (TP) SWITCH or THROTTLE POSITION (TP) SENSOR in TESTS W/CODES - 2.0L TURBO article.

ENGINE COOLANT TEMPERATURE SENSOR

See TESTS W/CODES - 2.0L TURBO article.

HEATED OXYGEN SENSOR

See TESTS W/CODES - 2.0L TURBO article.

INTAKE AIR TEMPERATURE SENSOR

Sensor is a part of volume airflow sensor assembly. See TESTS W/CODES - 2.0L TURBO article.

MANIFOLD ABSOLUTE PRESSURE SENSOR

See TESTS W/CODES - 2.0L TURBO article.

MANIFOLD DIFFERENTIAL PRESSURE SENSOR

See TESTS W/CODES - 2.0L TURBO article.

Scheme 2

Scheme 3

Scheme 4

1. Switch is mounted to automatic transmission, near shift lever mechanism.
2. Ensure switch is adjusted properly. Switch output can be affected by improper adjustment. On Eclipse 2.0L, switch is not adjustable. Go to next step.
3. On Eclipse 2.0L turbo, ensure continuity exists between specified terminals. (Scheme 2)and (Scheme 3). If continuity is not as specified, replace switch.

POWER STEERING OIL PRESSURE (PSP) SWITCH

1. Disconnect switch connector at pump. Using DVOM, check continuity between switch and chassis ground. Continuity should not exist with wheels straight ahead and engine idling. Continuity should be present when wheels are turned to lock position or when pump pressure is increased.
2. Check continuity of circuit between switch connector and PCM connector terminal No. 37. If continuity exists, go to next step. If continuity does not exist, check and repair circuit.
3. Disconnect power steering oil pressure switch connector and PCM connector. See «POWERTRAIN CONTROL MODULE (PCM) LOCATION»(ref-19155-S25654146842000123000000) table under COMPUTERIZED ENGINE CONTROLS. Connect jumper wire between PCM terminal No. 37 and chassis ground. Using DVOM, check for continuity between switch connector and chassis ground. If continuity exists, go to next step. If continuity does not exist, check and repair circuit.
4. Turn ignition on. Using DVOM, check voltage at switch connector. If battery voltage is present, system is okay. If battery voltage is not present and PCM is suspected, substitute PCM with known-good unit and retest.

THROTTLE POSITION SENSOR

See TESTS W/CODES - 2.0L TURBO article.

VEHICLE SPEED SENSOR

See TESTS W/CODES - 2.0L TURBO article.

VOLUME AIRFLOW SENSOR

See TESTS W/CODES - 2.0L TURBO article.

Idle Air Control Motor

See TESTS W/CODES - 2.0L TURBO article.

RELAYS

MFI RELAY LOCATION

Scheme 5

1. Turn ignition off. Disconnect PCM connector. See «POWERTRAIN CONTROL MODULE (PCM) LOCATION»(ref-19155-S25654146842000123000000) table under COMPUTERIZED ENGINE CONTROLS. On Eclipse 2.0L turbo, go to next step.
2. Turn ignition on. Using DVOM, check voltage between PCM connector terminal No. 82 and chassis ground. (Scheme 1) If battery voltage is present, go to next step. If battery voltage is not present, check and repair circuit between ignition switch and PCM connector.
3. Check voltage between PCM connector terminal No. 38 and chassis ground. If battery voltage is present, go to next step. If battery voltage is not present check and repair circuit between ignition switch and PCM connector.
4. Check voltage between PCM connector terminals No. 12 and 25 and chassis ground. Battery voltage should exist when PCM connector terminal No. 38 is grounded. If voltage is not as specified, ignition switch and PCM connector. If voltage is as specified, go to next step.
5. Turn ignition off. Check continuity between PCM connector terminals No. 13 and 26 and chassis ground. If continuity exists, go to next step. If continuity does not exist, check and repair circuits between MFI relay connector and PCM.
6. Turn ignition on. Check voltage between PCM connector terminal No. 60 on Galant or No. 80 on Eclipse and chassis ground. If battery voltage is not present, check and repair circuit between PCM and battery. If battery voltage is present, on Galant, go to step 9). On Eclipse, go to next step.
7. Remove MFI relay. Check resistance between MFI relay terminals No. 2 and 4. Resistance should be approximately 70 ohms. If continuity is not as specified, replace MFI relay. If continuity is as specified, go to next step.
8. Connect 12-volt power source between MFI relay terminals No. 4and 2. Connect positive lead to terminal No. 4. With MFI relay energized, continuity should exist between terminals No. 1 and 3. With power source removed, continuity should not exist. If continuity is not as specified, replace MFI relay. If continuity is as specified, substitute PCM with known-good unit and retest.
9. Connect 12-volt power source between MFI relay terminals No. 4and 2. Connect positive lead to terminal No. 4. With MFI relay energized, continuity should exist between terminals No. 1 and 3. With power source removed, continuity should exist between terminals No. 2 and 4. If continuity is not as specified, replace MFI relay. If continuity is as specified, substitute PCM with known-good unit and retest.

Radiator Cooling Fan Control Relay (Hi & Lo)

See TESTS W/CODES - 2.0L TURBO article.

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

See TURBOCHARGED under AIR INDUCTION SYSTEMS.

FUEL DELIVERY

Note. For fuel system pressure testing, see BASIC TESTING - 2.0L TURBO article.

See TESTS W/CODES - 2.0L TURBO article.

Fuel Injectors

See TESTS W/CODES - 2.0L TURBO article.

IDLE AIR CONTROL (IAC) MOTOR

For testing procedures, see TESTS W/CODES - 2.0L TURBO article.

IGNITION SYSTEM

For basic ignition checks, see BASIC TESTING - 2.0L TURBO article.

Camshaft Position Sensor

See TESTS W/CODES - 2.0L TURBO article.

Crankshaft Position Sensor

See TESTS W/CODES - 2.0L TURBO article.

Knock Sensor

See TESTS W/CODES - 2.0L TURBO article.

1. Label and disconnect both vacuum hoses from solenoid valve. See «VACUUM DIAGRAMS - 2.0L TURBO»(ref-19187) article. Disconnect electrical connector. Connect hand-held vacuum pump to solenoid valve nipple where Green-striped hose was connected. Apply vacuum to solenoid valve. Vacuum should hold.
2. Apply battery voltage to terminals of solenoid valve. Vacuum should bleed down when voltage is applied to terminals. Using an ohmmeter, check resistance across solenoid valve terminals. Reading should be 36-44 ohms at 68°F (20°C). If reading is not within specification, replace valve.
3. Disconnect EGR solenoid connector. Turn ignition on. Using DVOM, check voltage at connector MFI relay power supply terminal. See «EGR CONTROL SOLENOID HARNESS CONNECTOR TERMINAL ID»(ref-19155-S08318961372000123000000) table.
4. If battery voltage is present, go to step 5). If battery voltage is not present, check and repair circuit between purge solenoid and MFI relay. If circuit is okay, inspect MFI relay. See «RELAYS»(ref-19155-S08408607202000123000000) under MOTORS, RELAYS & SOLENOIDS.
5. Disconnect PCM connector. See «POWERTRAIN CONTROL MODULE (PCM) LOCATION»(ref-19155-S25654146842000123000000) table under COMPUTERIZED ENGINE CONTROLS. Connect jumper wire between PCM terminal No. 6 and chassis ground. (Scheme 1)
6. Using DVOM, check for continuity between connector PCM control circuit terminal and chassis ground. See «EGR CONTROL SOLENOID HARNESS CONNECTOR TERMINAL ID»(ref-19155-S08318961372000123000000) table. If continuity does not exist, check and repair circuit as needed. If continuity exists and preceding tests do not show any system or component malfunction and PCM is suspected, substitute PCM with known-good unit and retest system. EGR CONTROL SOLENOID HARNESS CONNECTOR TERMINAL ID Application Terminal No. Wire Color MFI Relay Circuit 1 Black/Red PCM Control Circuit 2 Lt. Green/Red

EVAP Purge Control Valve

Remove EVAP purge control valve. Valve is mounted between canister and purge control solenoid valve. See VACUUM DIAGRAMS - 2.0L TURBO article. Apply vacuum to diaphragm of vacuum valve. Valve should begin opening at approximately 15.7 in. Hg. Observe operation of valve through by-pass opening.

PCV Valve

Remove PCV valve. Shake valve by hand. Valve should rattle if moving freely. Apply air pressure to valve. Air should flow in one direction only. Connect PCV valve to vacuum hose and start engine. Ensure vacuum is flowing through valve.

MISCELLANEOUS CONTROLS

Note. Although some of the controlled devices listed here are not technically engine performance components, they can affect driveability if they malfunction.

A/C SWITCH & COMPRESSOR CLUTCH RELAY

Using DVOM, check A/C power supply voltage from PCM. Turn ignition to OFF position. Disconnect PCM connector. Turn A/C switch and ignition switch to ON positions. Check voltage between specified PCM terminals and chassis ground. See A/C POWER PCM TERMINAL IDENTIFICATION table. If battery voltage is not as present, check and repair circuit(s).

A/C POWER PCM TERMINAL IDENTIFICATION

Wiring Diagram (Eclipse 2.0L Turbo - 1 Of 2). Scheme 6

Wiring Diagram (Eclipse 2.0L Turbo - 2 Of 2). Scheme 7