General: Diagnosis Mitsubishi Eclipse IV

TROUBLESHOOTING CONTENTS

Troubleshooting of electronic control systems for which the scan tool can be used follows the basic outline described below. Even in systems for which the scan tool cannot be used, part of these systems still follow this outline.

1. STANDARD FLOW OF DIAGNOSTIC TROUBLESHOOTING Troubleshooting strategy is shown in each procedure.
2. SYSTEM OPERATION AND SYMPTOM VERIFICATION TESTS If verification of the symptom(s) is difficult, procedures for checking operation and verifying symptoms are shown.
3. DIAGNOSTIC FUNCTION The following trouble code diagnoses are shown. How to read diagnostic trouble codes How to erase diagnostic trouble codes Input inspection service points
4. DIAGNOSTIC TROUBLE CODE CHART If the scan tool displays a diagnostic trouble code, find the applicable inspection procedure according to this chart.
5. SYMPTOM CHART If there are symptoms, even though the scan tools show that no DTCs are set, inspection procedures for each symptom will be found by using this chart.
6. DIAGNOSTIC TROUBLE CODE PROCEDURES Indicates the inspection procedures corresponding to each diagnostic trouble code. (Refer to «HOW TO USE THE INSPECTION PROCEDURES»(ref-241284-S16363382922006081100000) ).
7. SYMPTOM PROCEDURES Indicates the inspection procedures corresponding to each symptom listed in the Symptom Chart (Refer to «HOW TO USE THE INSPECTION PROCEDURES»(ref-241284-S16363382922006081100000) ).
8. SERVICE DATA REFERENCE TABLE Inspection items and normal judgment values have been provided in this chart as reference information.
9. CHECK AT ECU TERMINALS Terminal numbers for the ECU connectors, inspection items, and standard values have been provided in this chart as reference information. TERMINAL VOLTAGE CHECKS Connect a needle-nosed wire probe to a voltmeter probe. CAUTION: Short-circuiting the positive (+) probe between a connector terminal and ground could damage the vehicle wiring, the sensor, the ECU, or all three. Use care to prevent this! Insert the needle-nosed wire probe into each of the ECU connector terminals from the wire side, and measure the voltage while referring to the check chart. NOTE: Measure voltage with the ECU connectors connected. You may find it convenient to pull out the ECU to make it easier to reach the connector terminals. Checks don't have to be carried out in the order given in the chart. If voltage readings differ from normal condition values, check related sensors, actuators, and wiring. Replace or repair as needed. After repair or replacement, recheck with the voltmeter to confirm that the repair has corrected the problem. TERMINAL RESISTANCE AND CONTINUITY CHECKS Turn the ignition switch to the "LOCK" (OFF) position. Disconnect the ECU connector. CAUTION: If resistance and continuity checks are performed on the wrong terminals, damage to the vehicle wiring, sensors, ECU, and/or ohmmeter may occur. Use care to prevent this! Measure the resistance and check for continuity between the terminals of the ECU harness-side connector while referring to the check chart. NOTE: Checks don't have to be carried out in the order given in the chart. If the ohmmeter shows any deviation from the Normal Condition value, check the corresponding sensor, actuator and related electrical wiring, then repair or replace. After repair or replacement, recheck with the ohmmeter to confirm that the repair has corrected the problem.
10. INSPECTION PROCEDURES USING AN OSCILLOSCOPE When there are inspection procedures using an oscilloscope, these are listed.

HOW TO USE THE INSPECTION PROCEDURES

The causes of many of the problems occurring in electric circuitry are generally the connectors, components, the ECU, and the harnesses between connectors, in that order. These inspection procedures follow this order. They first try to discover a problem with a connector or a defective component.

CURRENT TROUBLE

Indicates that the trouble is currently present. Carry out troubleshooting as described in the applicable inspection procedure.

PAST TROUBLE

Indicates that the trouble is historic, but normal operation has been restored. Observe the applicable inspection procedure with particular emphasis on connector(s) and wiring harness.

HARNESS INSPECTION

Check for an open or short circuit in the harness between the terminals which were faulty according to the connector measurements. Carry out this inspection while referring to HARNESS CONNECTOR INSPECTION . Here, "Check harness between power supply and terminal xx" also includes checking for blown fuse. For inspection service points when there is a blown fuse, refer to " INSPECTION SERVICE POINTS FOR A BLOWN FUSE ."

IF INSPECTING WITH THE CONNECTOR CONNECTED < WATERPROOF CONNECTORS >

Be sure to use special tool. Never insert a test probe from the harness side, as this will reduce the waterproof performance and result in corrosion.

Scheme 2

IF INSPECTING WITH THE CONNECTOR CONNECTED < ORDINARY (NON-WATERPROOF) CONNECTORS >

Required Special Tool

1. MB992006: Extra Fine Probe

Inspect by inserting a test probe from the harness side. If the connector is too small to insert a test probe (e.g. control unit connector), do not insert it forcibly. Use special tool MB992006 (extra fine probe).

Scheme 3

IF INSPECTING WITH THE CONNECTOR DISCONNECTED < WHEN INSPECTING A FEMALE PIN >

Required Special Tool

Scheme 4

Scheme 5

1. MB991219: Inspection Harness (Included in MB991223, Harness Set)
2. The special tool MB991219 for connector pin contact pressure should be used. The test probe should never be forcibly inserted, as it may cause a defective contact.
3. From back side of the connector (SRS-ECU harness side connector)
4. Since the SRS-ECU harness connector is plated to improve conductivity, observe the warning below when checking this connector.

IF INSPECTING WITH THE CONNECTOR DISCONNECTED < WHEN INSPECTING A MALE PIN >

Touch the pin directly with the test probe.

Scheme 6

Scheme 7

1. Connector is disconnected or improperly connected
2. Connector pins are pulled out
3. Stretched and broken wires at terminal section
4. Low contact pressure between male and female terminals
5. Low connection pressure due to rusted terminals or foreign matter lodged in terminals

CONNECTOR PIN INSPECTION

If the connector pin stopper is damaged, the terminal connections (male and female pins) will not be perfect even when the connector body is connected, because the pins may pull out of the back side of the connector. Therefore, gently pull the wires one by one to make sure that no pins pull out of the connector.

Scheme 8

CONNECTOR ENGAGEMENT INSPECTION

Required Special Tool

1. MB991219: Inspection Harness (contained in MB991223 Test Harness)

Use special tool MB991219 to inspect the engagement of the male pins and female pins. [Pin drawing force: 1 N (0.2 pound) or more]

Scheme 9

INSPECTION SERVICE POINTS FOR A BLOWN FUSE

Remove the blown fuse and measure the resistance between the load side of the blown fuse and the ground. Close the switches of all circuits which are connected to this fuse. If the resistance is almost Zero ohms at this time, there is a short somewhere between these switches and the load. If the resistance is not 0 ohms, there is no short at the present time, but a momentary short has probably caused the fuse to blow.

The main causes of a short circuit are the following.

Scheme 10

1. Harness being clamped by the vehicle body
2. Damage to the outer casing of the harness due to wear or heat
3. Water getting into the connector or circuitry
4. Human error (mistakenly shorting a circuit, etc).

HOW TO TREAT CURRENT TROUBLE

1. Make a note of the diagnostic trouble code, and erase it.
2. Check the trouble symptom again.
3. Check for diagnostic trouble codes again.
4. If a diagnostic trouble code is set, follow the applicable Diagnostic Trouble Code Chart.
5. If no diagnostic trouble code is set, refer to " «HOW TO COPE WITH INTERMITTENT MALFUNCTION»(ref-241284-S30929246612006081100000) ."

HOW TO TREAT PAST TROUBLE

1. Establish from the customer whether a fuse or connector has been replaced or disconnected.
2. If yes, erase the diagnostic trouble code, and then check that no diagnostic code is reset. If no diagnostic trouble code is reset, the diagnosis is complete.
3. If no, follow the applicable Diagnostic Trouble Code Chart. Then check the wiring harness and connector, and refer to " «HOW TO COPE WITH INTERMITTENT MALFUNCTION»(ref-241284-S30929246612006081100000) ."

INTERSYSTEM AFFILIATED DTC REFERENCE TABLE

For vehicles with CAN, when DTC which influences the transmission data is set to the ECU which sends the data, DTC also could be set to the ECU which receives and controls the transmission data. The table below shows the relativity of DTC between ECUs. In addition, the alphabet shows the following DTC.

1. A: TCL - (Refer to «DTC NO. U1073»(ref-241287-S14173964792006081100000) - Traction control system diagnosis)
2. B: TCL - (Refer to «DTC NO. U1120»(ref-241287-S06860769952006081100000) - Traction control system diagnosis)
3. C: Air conditioner - (Refer to «DTC NO. U1120»(ref-241288-S31847108422006081100000) - Manual A/C diagnosis)
4. D: SWS - (Refer to «DTC NO. U1128»(ref-241289-S08710369032006081100000) - SWS diagnosis) INTERSYSTEM AFFILIATED DTC REFERENCE CHART CAUSAL DTC NO. DTC SET NO. SYSTEM NAME DTC NO. A B C D (< 2.4 L engine > Refer to - «DIAGNOSTIC TROUBLE CODE CHART»(ref-241290-S20949381442006081100000) < 3.8 L engine > Refer to - «DIAGNOSTIC TROUBLE CODE CHART»(ref-241291-S08054306522006081100000) ) P0101, P0102, P0103, P0111, P0112, P0113, P0116, P0122, P0123, P0125, P0134, P0154, P0171, P0172, P0174, P0175 X P0117, P0118 X X P0201, P0202, P0203, P0204, P0205, P0206, P0222, P0223 X P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0325, P0335, P0340 X P0506, P0507 X P0638, P0657 X P1601, P2108, P2127, P2128, P2135, P2227, P2228 X P2138 X X P2122, P2123 X X Combination meter (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-241292-S40273146372006081100000) ) U1120 X

Scheme 11

The vehicle identification number (VIN) is located on a plate attached to the left top side of the instrument panel.

SCAN TOOL (MUT-III SUB ASSEMBLY)

Note. MUT-III trigger harness is not necessary when pushing V.C.I. ENTER key.

Scheme 12

WHEN USING SCAN TOOL MB991958

Required Special Tools

1. MB991668: Belt Tension Meter Set
2. MB991958: Scan Tool (MUT-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991910: MUT-III Main Harness A

Scheme 13

Scheme 14

1. Connect special tool MB991668 to scan tool MB991824.
2. Connect scan tool MB991910 to scan tool MB991824.
3. Connect scan tool MB991910 to the data link connector.
4. Turn the ignition switch to the "ON" position and select "Belt Tension" from the menu scan tool MB991824 screen. CAUTION: The temperature of the surface of the belt should be as close as possible to underhood temperature. DO NOT let any contaminants such as water or oil get onto the microphone. If strong gusts of wind blow against the microphone or if there are any loud sources of noise nearby, the values measured by the microphone may not correspond to actual values. If the microphone is touching the belt while the measurement is being made, the values measured by the microphone may not correspond to actual values. DO NOT take the measurement while the vehicle's engine is running.
5. Hold special tool MB991668 (microphone) to the middle of the drive belt between the pulleys (at the place indicated by the arrow), about 10 - 20 mm (0.4 - 0.8 inch) away from the rear surface of the belt and so that it is perpendicular to the belt (within an angle of +/- 15 degree angle).
6. Gently tap the middle of the belt between the pulleys (the place indicated by the arrow) with your finger as shown in the illustration, and check that the vibration frequency of the belt is within the standard value. Standard value: 143 - 169 Hz NOTE: Because the frequency depends on the belt material, confirm Part No. shown on the reverse of the belt.

Required Special Tools

1. MB991668: Belt Tension Meter Set
2. MB991958: Scan Tool (MUT-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991910: MUT-III Main Harness A

Gently tap the middle of the belt between the pulleys (the location indicated by the arrow) with your finger as shown in the illustration, and check that the vibration frequency of the belt is within the standard value.

Note. Refer to WHEN USING SCAN TOOL MB991958 for details on the method of measuring the vibration frequency using the scan tool.

Standard value

POWER STEERING DRIVE BELT TENSION ADJUSTMENT REFERENCE DATA

Scheme 15

15. COOLANT HOSES (RADIATOR HOSE, HEATER HOSE) (INSPECT)

Inspect the surface of radiator hoses and heater hoses for heat and mechanical damage. Hard and brittle rubber, cracking, tears, cuts, abrasions and excessive swelling indicate deterioration of the rubber.

16. DISC BRAKE PADS, ROTORS (INSPECT FOR WEAR)

Check for fluid contamination and wear. Replace the complete set of pads if any one pad is defective.

Thickness of lining

Minimum limit: 2.0 mm (0.08 inch)

Scheme 16

20. SUSPENSION SYSTEM (INSPECT FOR LOOSENESS AND DAMAGE)

Visually inspect the front/rear suspension components for deterioration and damage. Re-tighten the front/rear suspension components retaining bolts to specified torque.