Engine Controls - Basic Diagnostic Procedures: Other Mitsubishi Lancer IX

Cylinder Compression Check

Before inspection, check that the engine oil, starter and battery are normal. Also, set the vehicle to the following conditions

1. Engine coolant temperature: 176-203°F (80-95°C)
2. Lights and all accessories: OFF
3. Transaxle: "P" range

1. Disconnect the spark plug cables.
2. Remove all of the spark plugs.
3. Disconnect the crankshaft position sensor connector. NOTE: Doing so will prevent the engine control module from carrying out ignition and fuel injection. WARNING: Keep your distance from the spark plug hole when cranking. Oil, fuel, etc., may spray from the spark plug hole and may cause serious injury.
4. Cover the spark plug hole with a shop towel or the like, during cranking. After the engine has been cranked, check for foreign material adhering to the shop towel.
5. Set compression gauge to one of the spark plug holes.
6. Crank the engine with the throttle valve fully open and measure the compression pressure. See «COMPRESSION SPECIFICATIONS»(ref-157284-S33963074262003080800000) table.
7. Measure the compression pressure for all the cylinders, and check that the pressure differences of the cylinders are below the limit: 14 psi (98 kPa).
8. If there is a cylinder with compression or a compression difference that is outside the limit, pour a small amount of engine oil through the spark plug hole, and repeat the operations in steps 6 - 8 . If the compression increases after oil is added, the cause of the malfunction is a worn or damaged piston ring and/or cylinder inner surface. If the compression does not rise after oil is added, the cause is a burnt or defective valve seat, or pressure is leaking from the gasket.
9. Connect the crankshaft position sensor connector.
10. Install the spark plugs and spark plug cables.
11. Use the scan tool to erase the diagnostic trouble codes. NOTE: This will erase the diagnostic trouble code resulting from the crankshaft position sensor connector being disconnected.

COMPRESSION SPECIFICATIONS

Exhaust System Backpressure

The exhaust system can be tested with a vacuum or pressure gauge. If using a pressure gauge, remove front Heated Oxygen Sensor (HO2S). Connect a 0-5 psi pressure gauge and run engine at 2500 RPM. If exhaust system backpressure is greater than 2 psi, exhaust system or catalytic converter is plugged.

If using a vacuum gauge, connect vacuum gauge hose to intake manifold vacuum port. Start engine. Observe vacuum gauge. Open throttle part way and hold steady. If vacuum gauge indication slowly drops after stabilizing, inspect exhaust system for restriction.

FUEL SYSTEM

Note. Manufacturer does not provide fuel pump maximum pressure or volume specifications.

Diamante

Remove the rear seat cushion. Remove the fuel pump/fuel gauge floor cover plate and disconnect the wiring connector at the fuel pump/gauge assembly. (Scheme 100) Start the engine and let it run until it stops naturally, turn the ignition off. Re-connect the fuel pump/gauge wiring harness connector. Install the rear seat cushion.

Scheme 100

Eclipse, Eclipse Spyder & Galant

Remove the instrument panel side cover (driver's side). Disconnect the fuel pump relay (2). (Scheme 101) Start the engine and let it run until it stops naturally. Turn the ignition off. Connect the fuel pump relay (2). Install the instrument panel side cover (driver's side).

Scheme 101

Lancer, Lancer Evolution VIII & Outlander

Remove the rear seat assembly. Remove the protector. Disconnect the fuel pump module connector. (Scheme 102)- (Scheme 104). After starting the engine and letting it run until it stops naturally, turn the ignition off. Connect the fuel pump module connector. Install the protector and rear seat assembly.

Scheme 102

Scheme 103

Scheme 104

Montero

Turn the ignition off. Fold down the second seat. Remove the service hole cover (upper) and packing. Remove the service hole cover (lower) and packing. Disconnect fuel pump module connector. (Scheme 105) Start the engine and let it run until it stops naturally. Turn the ignition off. Connect the fuel pump module connector.

Scheme 105

Montero Sport

Disconnect the fuel pump relay connector. (Scheme 106) Start the engine and let it run until it stops naturally. Turn the ignition off. Connect the fuel pump relay.

Scheme 106

FUEL PRESSURE

Using Fuel Pressure Gauge

1. Remove the union joint and bolt from Adaptor Hose (MD998709) and instead, attach Hose Adaptor (MB998742) to the adaptor hose.
2. Place a suitable O-ring or gasket on assembled adaptor hose and hose adaptor and install the fuel pressure gauge.
3. Install the assembled fuel pressure measurement tools between the fuel rail and high-pressure fuel hose. (Scheme 107)

Scheme 107

Scheme 108

1. Remove the union joint and bolt from Adaptor Hose (MD998709) and instead, attach Hose Adaptor (MD998742) to the adaptor hose.
2. Install Fuel Pressure Gauge Set (MB991637) to assembled hose and adaptor via a gasket.
3. Install the assembled fuel pressure measurement tools between the fuel rail and the high-pressure fuel hose. (Scheme 108) CAUTION: To prevent damage to the scan tool, always turn the ignition off before connecting or disconnecting it.
4. Connect Scan Tool (MB991502) to the data link connector.
5. Use the Actuator Test 07 to drive the fuel pump. Check that there is no fuel leaking from any section when the fuel pump is operating.
6. Stop the fuel pump.
7. Start the engine and run at idle.
8. Measure fuel pressure while the engine is running at idle. See «FUEL PUMP PERFORMANCE»(ref-157284-S15168728752003081100000) table.
9. Disconnect the vacuum hose from the fuel pressure regulator and measure fuel pressure with the hose end closed with your finger. See «FUEL PUMP PERFORMANCE»(ref-157284-S15168728752003081100000) table.
10. Check to see that fuel pressure at idle does not drop even after the engine has been revved several times.
11. While revving the engine repeatedly, hold the fuel return hose lightly with your fingers to feel that fuel pressure is present in the return hose. NOTE: If the fuel flow rate is low, there will be no fuel pressure in the return hose.
12. If any of the fuel pressures measured in steps 10 - 13 are out of specification, trouble shoot and repair according to «FUEL PRESSURE TROUBLE SHOOTING»(ref-157284-S15416565742003081100000) table.
13. Stop the engine and observe fuel pressure gauge reading. It is normal if the reading does not drop within two minutes. If it does, observe the rate of drop and trouble shoot and repair according to «FUEL PRESSURE DROP TROUBLE SHOOTING»(ref-157284-S41816642582003081100000) table. Start, then stop the engine. Squeeze the fuel return line closed to confirm leak-down occurs from defective fuel pressure regulator. Squeeze the fuel supply line closed to confirm leak-down occurs from defective fuel pump check valve. If pressure continues to drop with both fuel lines squeezed closed, injector(s) are leaking.
14. Release residual pressure from the fuel pipe line. See «FUEL SYSTEM PRESSURE RELEASE»(ref-157284-S05876951042003080800000). WARNING: Cover the hose connection with shop towels to prevent splash of fuel that could be caused by some residual pressure in the fuel pipe line.
15. Remove the fuel pressure gauge set, and hose and adaptor from the fuel rail.
16. Replace the O-ring at the end of the high-pressure fuel hose with a new one.
17. Fit the high-pressure fuel hose into the fuel rail and tighten the bolts to 37-53 INCH lbs. (4-6 N.m).
18. Use the scan tool to operate the fuel pump and check the fuel line for any leaks. Repair as needed.
19. Disconnect the scan tool.

FUEL PUMP PERFORMANCE

FUEL PRESSURE TROUBLE SHOOTING

FUEL PRESSURE DROP TROUBLE SHOOTING

Diamante, Eclipse, Eclipse Spyder & Galant

1. Turn the ignition off.
2. Remove the instrument panel side cover (driver's side).
3. Remove the fuel pump relay (2), and apply battery voltage to junction block side connector terminal No. 4. (Scheme 109) Check that an operating sound can be heard from the fuel pump. NOTE: As the fuel pump is an in-tank type, the fuel pump sound is hard to hear. Remove the fuel tank filler tube cap and check from the tank inlet.
4. Check for fuel pressure by pinching the fuel hose with fingertips.
5. Install the fuel pump relay (2) and instrument panel side cover (driver's side).

Scheme 109

Lancer & Lancer Evolution VIII

1. Turn the ignition off.
2. Remove the rear seat assembly.
3. Remove the protector.
4. Disconnect the fuel pump module connector. (Scheme 110)or (Scheme 111).
5. When the fuel pump drive connector is attached directly to the battery, check if the sound of the fuel pump operation can be heard. NOTE: As the fuel pump is an in-tank type, the fuel pump sound is hard to hear. Remove the fuel tank filler tube cap and check from the tank inlet.
6. Check for fuel pressure by pinching the fuel hose with fingertips.
7. Connect the fuel pump module connector.
8. Install the protector and rear seat assembly.

Scheme 110

Scheme 111

1. Turn the ignition off.
2. Remove the fuel pump relay (2). Connect terminal number 3 of the harness-side connector to the battery. (Scheme 112) Check if the fuel pump operation sound can be heard at this time. NOTE: As the fuel pump is an in-tank type, the fuel pump sound is hard to hear. Remove the fuel tank filler tube cap and check from the tank inlet.
3. Check the fuel pressure by pinching the fuel hose with your fingertips.
4. Install the fuel pump relay (2).

Scheme 112

1. Turn the ignition off.
2. Remove the fuel pump relay connector. Connect terminal No. 1 of the harness-side connector to the battery. (Scheme 113) Check that the fuel pump operation can be heard at this time. NOTE: As the fuel pump is an in-tank type, the fuel pump sound is hard to hear. Remove the fuel tank filler tube cap and check from the tank inlet.
3. Check the fuel pressure by pinching the fuel hose with your fingertips.
4. Install the fuel pump relay connector.

Scheme 113

Outlander

1. Turn the ignition off.
2. Remove the rear seat assembly.
3. Remove the service hole cover.
4. Disconnect the fuel pump module connector. (Scheme 114)
5. When the fuel pump drive connector is attached directly to the battery, check if the fuel pump can be heard operating. If no operating sound is heard, replace the fuel tank pump. NOTE: As the fuel pump is an in-tank type, the fuel pump sound is hard to hear. Remove the fuel tank filler tube cap and check from the tank inlet.
6. Check for fuel pressure by pinching the fuel hose with fingertips.
7. Connect the fuel pump module connector.
8. Install the service hole cover and rear seat assembly.

Scheme 114

IGNITION CHECKS

Note. Perform all circuit tests with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure.

MFI RELAY

If relay does not test as specified in MFI RELAY CHECK VALUES table, replace the MFI relay.

MFI RELAY CHECK VALUES

SPARK

Check for spark at coil wire (if applicable) and at each spark plug wire using a high output spark tester. Check spark plug wire resistance on suspect wires. Wire resistance should not exceed 22,000 ohms.

CAMSHAFT POSITION SENSOR

For CMP sensor testing procedure, see CAMSHAFT POSITION SENSOR under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING article.

CRANKSHAFT POSITION SENSOR

For CKP sensor testing procedure, see CRANKSHAFT POSITION SENSOR under SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING article.

Ignition Coil Check (Diamante)

1. Measure primary coil resistance between connector terminals No. 1 and 4 of the distributor. See «IGNITION COIL RESISTANCE»(ref-157284-S14364499812003081200000) table.
2. Measure secondary coil resistance between the high-voltage terminals and connector terminals No. 1 or 4. See «IGNITION COIL RESISTANCE»(ref-157284-S14364499812003081200000) table.

Ignition Coil Check (Eclipse, Eclipse Spyder, Galant & Outlander 2.4L, Lancer, Lancer Evolution VIII & Montero)

Note. All 2.4L models are equipped with a built-in ignition power transistor as part of the ignition coil.

Measure secondary coil resistance between the high-voltage terminals of the ignition coil. See IGNITION COIL RESISTANCE table.

Note. An analog-type ohmmeter should be used.

To check primary coil and ignition power transistor continuity, connect the negative probe of the ohmmeter to terminal No. 1. As described in PRIMARY COIL & IGNITION POWER TRANSISTOR CONTINUITY CHECK table, perform a continuity check on the ignition coil and power transistor. Connect and disconnect 1.5V battery between terminals No. 2 and 3, and observe the ohmmeter for continuity. (Scheme 115) If results are not within specification, replace the primary coil and ignition power transistor assembly.

PRIMARY COIL & IGNITION POWER TRANSISTOR CONTINUITY CHECK

Scheme 115

Ignition Coil Check (Eclipse, Eclipse Spyder & Galant 3.0L)

1. Measure primary coil resistance between connector terminals No. 1 and 2 of the distributor. See «IGNITION COIL RESISTANCE»(ref-157284-S14364499812003081200000) table.
2. Measure secondary coil resistance between the high-voltage terminal and connector terminal No. 1. See «IGNITION COIL RESISTANCE»(ref-157284-S14364499812003081200000) table.

Ignition Coil Check (Montero Sport)

1. Measure primary coil resistance between each ignition coil terminal. See «IGNITION COIL RESISTANCE»(ref-157284-S14364499812003081200000) table.
2. Measure secondary coil resistance between each ignition coil high-voltage terminal as follows: Cylinders No. 3 and 6 coil - A coil. Cylinders No. 1 and 4 coil - B coil. Cylinders No. 2 and 5 coil - C coil. See «IGNITION COIL RESISTANCE»(ref-157284-S14364499812003081200000) table for standard resistance values.

IGNITION COIL RESISTANCE

IGNITION TIMING CHECK

1. Before inspection, make sure the vehicle meets the following criteria: Engine coolant temperature: 176-203°F (80-95°C). Lights and all accessories: OFF. Transaxle: Neutral (P range on vehicles with A/T).
2. Insert a paper clip into the No. 3 terminal of the 3 pin connector.
3. Connect a primary voltage detection type tachometer to the paper clip.
4. Install the timing light.
5. Start the engine and run at idle.
6. Check that the idle speed approximately matches the speed specified in «IDLE SPEED SPECIFICATIONS»(ref-157284-S10540671072003081300000) table.
7. Turn the ignition off.
8. Connect the scan tool to the data link connector.
9. Start the engine and run it at idle.
10. Select the MFI system Actuator Test from the scan tool menu and scroll to item 17 - Basic Ignition Timing.
11. Press the "Y" key and check that the basic ignition timing is the standard value. See «IGNITION TIMING SPECIFICATIONS»(ref-157284-S39123215312003081300000) table.
12. If the ignition timing value is not within the standard value range, check the crankshaft position sensor. See «CRANKSHAFT POSITION SENSOR»(ref-157284-S08216432592003081200000) under IGNITION CHECKS.
13. Check that the idling ignition timing is at the correct value. See «IGNITION TIMING SPECIFICATIONS»(ref-157284-S39123215312003081300000) table. NOTE: Ignition timing is variable within about plus or minus 8°, even under normal operating conditions, and it is automatically further advanced by about 5° from 10° BTDC at higher altitudes.

1. Before inspection, make sure the vehicle meets the following criteria: Engine coolant temperature: 176-203°F (80-95°C). Lights and all accessories: OFF. Transaxle: Neutral ("P" range on vehicles with A/T).
2. Connect Scan Tool (MB991502) to the data link connector.
3. Set up a timing light.
4. Start the engine and run it at idle.
5. Check that the idle speed approximately matches the speed specified in «IDLE SPEED SPECIFICATIONS»(ref-157284-S10540671072003081300000) table.
6. Select scan tool actuator test "item No. 17".
7. Check that basic ignition timing is within the standard value. See «IGNITION TIMING SPECIFICATIONS»(ref-157284-S39123215312003081300000) table.
8. If the basic ignition timing is not within the standard value, check the following items: Diagnosis output. Timing belt cover and crankshaft position sensor installation conditions. Crankshaft sensing blade condition. CAUTION: If the actuator test is not cancelled, the forced drive will continue for 27 minutes. Driving in this state could lead to engine failure.
9. Press the clear key on the scan tool (select forced drive stop mode), and cancel the actuator test.
10. Check that the actual ignition timing is at the standard value. See «IGNITION TIMING SPECIFICATIONS»(ref-157284-S39123215312003081300000) . NOTE: Ignition timing fluctuates about plus or minus 7° Before Top Dead Center, even under normal operating conditions. NOTE: It is automatically further advanced by about 5-10° (3.0L, 3.5L: 5-15°) Before Top Dead Center at higher altitudes.

IDLE SPEED SPECIFICATIONS

IGNITION TIMING SPECIFICATIONS