Heating, Air Conditioning and Ventilation (Except Lancer Evolution) Mitsubishi Lancer Evolution X

GENERAL DESCRIPTION

The blower, heater, and evaporator have been integrated with the heater and A/C system to achieve greater fan power and noise reduction.

ITEM SPECIFICATION CHART

SAFETY PRECAUTIONS

Because R-134a refrigerant is a hydro fluorocarbon (HFC) which contains hydrogen atoms in place of chlorine atoms, it will not cause damage to the ozone layer.

Ozone filters out harmful radiation from the sun. To assist in protecting the ozone layer, Mitsubishi Motors Corporation recommends an R-134a refrigerant recycling device.

Refrigerant R-134a is transparent and colorless in both the liquid and vapor state. Since it has a boiling point of -29.8°C (-21.64°F) at atmospheric pressure, it will be a vapor at all normal temperatures and pressures. The vapor is heavier than air, non-flammable, and non-explosive. The following precautions must be observed when handling R-134a.

R-134a evaporates so rapidly at normal atmospheric pressures and temperatures that it tends to freeze anything it contacts. For this reason, extreme care must be taken to prevent any liquid refrigerant from contacting the skin and especially the eyes. Always wear safety goggles when servicing the refrigeration part of the A/C system. Keep a bottle of sterile mineral oil handy when working on the refrigeration system.

1. Should any liquid refrigerant get into your eyes, use a few drops of mineral oil to wash them out. R-134a is rapidly absorbed by the oil.
2. Next, splash your eyes with plenty of cold water.
3. Call your doctor immediately even if irritation has ceased.

In most instances, moderate heat is required to bring the pressure of the refrigerant in its container above the pressure of the system when charging or adding refrigerant.

A bucket or large pan of hot water not over 40°C (104.0°F) is all the heat required for this purpose. Do not heat the refrigerant container with a blow torch or any other means that would raise temperature and pressure above this temperature. Do not weld or steam-clean on or near the system components or refrigerant lines.

When metering R-134a into the refrigeration system, keep the supply tank or cans in an upright position. If the refrigerant container is on its side or upside down, liquid refrigerant will enter the system and damage the compressor.

Refrigerant will tarnish bright metal and chrome surfaces, and in combination with moisture can severely corrode all metal surfaces.

CONDENSER FAN AND RADIATOR FAN CONTROL

The ECM judges the required revolution speed of radiator fan motor and condenser fan motor using the input signals transmitted from A/C switch, secondary pulley speed sensor < CVT > or vehicle speed sensor (VSS) < M/T > and engine coolant temperature sensor.

COMPRESSOR CONTROL

When operating the A/C switch

1. The air thermo sensor, which senses the temperature of the air flowing out of the evaporator, deactivates the compressor at 1°C (33.8°F) or below.
2. The dual pressure switch turns OFF when the refrigerant pressure becomes excessively high or low, thus protecting the compressor circuit (See «A/C COMPRESSOR CLUTCH RELAY ON CONDITIONS CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution) table below).
3. When the air thermo sensor is activated, and the ignition switch, blower switch, and A/C switch are ON, the A/C compressor clutch relay is energized.

When operating the mode selection dial

1. The A/C will work when the mode selection dial is set to the "Defroster" or "Defroster/foot" position, or the temperature control dial is set to the "MAX A/C" position. In other dial positions, when the A/C switch is turned on, the A/C will work.

A/C Compressor Clutch Relay ON Conditions

A/C COMPRESSOR CLUTCH RELAY ON CONDITIONS CHART

GENERAL SPECIFICATIONS

GENERAL SPECIFICATIONS

SERVICE SPECIFICATIONS

SERVICE SPECIFICATIONS

LUBRICANTS

LUBRICANTS

CAUTION LABELS

The refrigerant gas caution label must be affixed in the location shown in the figure. Follow the instructions on the label when servicing.

Scheme 1

Scheme 2

INTRODUCTION TO HEATER, A/C AND VENTILATION DIAGNOSIS

Air is drawn into the heater assembly from either the outside, or from the inside of the passenger cabin if DEFROST, maximum cooling or RECIRCULATION are selected. The air is then forced through the evaporator where heat is removed, cooling and de-humidifying the air. Depending on the temperature selected, a portion of this air is then forced through the heater core to achieve the selected discharge temperature.

If the system does not cool properly, look for a problem with the refrigerant, blower or air distribution systems. If the system does not heat properly, look for a problem with the coolant, blower or air distribution systems. In either case all system fuses, circuit breaker and relays should be checked.

HEATER, A/C AND VENTILATION DIAGNOSTIC TROUBLESHOOTING STRATEGY

Use these steps to plan your diagnostic strategy. If you follow them carefully, you will be sure that you have exhausted most of the possible ways to find a heater, A/C and ventilation fault.

1. Gather information from the customer.
2. Verify that the condition described by the customer exists.
3. Find the malfunction by following the SYMPTOM CHART.
4. Verify that the malfunction is eliminated.

HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)

Required Special Tools

1. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

Scheme 3

1. Ensure that the ignition switch is at the "LOCK" (OFF) position.
2. Start up the personal computer.
3. Connect special tool MB991827 to special tool MB991824 and the personal computer.
4. Connect special tool MB991910 to special tool MB991824
5. Connect special tool MB991910 to the data link connector.
6. Turn the power switch of special tool MB991824 to the "ON" position. NOTE: When the special tool MB991824 is energized, the special tool MB991824 indicator light will be illuminated in a green color.
7. Start the M.U.T.-III system on the personal computer. NOTE: Disconnecting the scan tool special tool MB991824 is the reverse of the connecting sequence, making sure that the ignition switch is at the "LOCK" (OFF) position.

HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODES

Required Special Tools

1. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

Note. If the battery voltage is low, diagnostic trouble codes will not be set. Check the battery if scan tool MB991958 does not display.

1. Connect the scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "System select" from the start-up screen.
4. Select "From 2006 MY" of "Model Year." When the "Vehicle Information" is displayed, check the contents.
5. Select "AUTO A/C" from "System List," and press the "OK" button. NOTE: When the "Loading Option Setup" list is displayed, check the applicable item.
6. Select "Diagnostic Trouble Code" to read the DTC.
7. If a DTC is set, it is shown.
8. Choose "Erase DTCs" to erase the DTC.

HOW TO DIAGNOSE THE CAN BUS LINE

Required Special Tools

1. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "CAN bus diagnosis" from the start-up screen.
4. When the vehicle information is displayed, confirm that it matches the vehicle whose CAN bus lines will be diagnosed. If they match, go to step 8 . If not, go to step 5.
5. Select "view vehicle information" button.
6. When the vehicle information is displayed, confirm again that it matches the vehicle which is diagnosed CAN bus line. If they match, go to step 8 . If not, go to step 5 .
7. Press the "OK" button.
8. When the options are displayed, choose the options (mark the check) and then select "OK".

CHECK OF FREEZE FRAME DATA

The freeze frame data can be checked by using the scan tool (refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).

When detecting fault and storing the DTC, the ECU connected to CAN bus line obtains the data before the determination of the DTC and the data when the DTC is determined, and then stores the ECU status of that time. By analyzing the data from scan tool, the troubleshooting can be performed more efficiently. The displayed items are as shown in the table below.

DISPLAY ITEM LIST

DIAGNOSTIC TROUBLE CODE CHART

< VEHICLES WITHOUT A/C >

DIAGNOSTIC TROUBLE CODE CHART (VEHICLES WITHOUT A/C)

< VEHICLES WITH A/C >

DIAGNOSTIC TROUBLE CODE CHART (VEHICLES WITH A/C)

Scheme 4

DTC SET CONDITION

DTC B1000 will be set when the communication between heater control unit and heater control panel cannot be performed.

Current trouble

1. The heater control unit, the heater control panel, or connector(s) or wiring between the two may be defective.

Past trouble

1. If DTC B1000 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) between the heater control unit and the heater control panel. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU.

TROUBLESHOOTING HINT

1. Malfunction of connector.
2. Malfunction of the harness.
3. Malfunction of the heater control panel.
4. Malfunction of the heater control unit.

DIAGNOSIS

Required Special Tool

1. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

Scheme 5

Scheme 6

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line. Use scan tool MB991958 to diagnose the CAN bus lines. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to "ON" position. Diagnose the CAN bus line. Q: Is the check result satisfactory? YES: Go to Step 2. NO: Repair the CAN bus lines. Repair the CAN bus lines (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Go to Step 3. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
3. STEP 3. Check heater control panel connector C-136 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is heater control panel connector C-136 in good condition? YES: Go to Step 4. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
4. STEP 4. Measure the voltage at heater control panel connector C-136. Disconnect heater control panel connector C-136, and measure the voltage at the harness side. Turn the ignition switch to the "ON" position. Measure the voltage between terminal 6 and ground. The measured value should be approximately 12 volts (battery positive voltage). Q: Is the measured voltage approximately 12 volts? YES: Go to Step 6 . NO: Go to Step 5.
5. STEP 5. Check the wiring harness between heater control panel connector C-136 (terminal 6) and ETACS-ECU connector C-317 (terminal 5). Check the heater control panel power supply line for open circuit. NOTE: Also check joint connector C-03 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-03 is damaged, repair or replace the connector as described in «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Q: Is the wiring harness between heater control panel connector C-136 (terminal 6) and ETACS-ECU connector C-317 (terminal 5) in good condition? YES: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) . NO: Repair the wiring harness.
6. STEP 6. Measure the resistance at heater control panel connector C-136. Disconnect heater control panel connector C-136, and measure the resistance at the wiring harness side. Measure the resistance value between terminal 7 and ground. The measured value should be 2 ohms or less. Q: Does the measured resistance value correspond with this range? YES: Go to Step 8 . NO: Go to Step 7.
7. STEP 7. Check the wiring harness between heater control panel connector C-136 (terminal 7) and ground. Check the heater control panel ground line for open circuit. Q: Is the wiring harness between heater control panel connector C-136 (terminal 7) and ground in good condition? YES: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) . NO: Repair the wiring harness.
8. STEP 8. Check heater control unit connector C-48 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is heater control unit connector C-48 in good condition? YES: Go to Step 9. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
9. STEP 9. Check the wiring harness between heater control unit connector C-48 (terminal 9) and heater control panel connector C-136 (terminal 9). Check the heater control panel signal line for open and short circuit. Q: Is the wiring harness between heater control unit connector C-48 (terminal 9) and heater control panel connector C-136 (terminal 9) in good condition? YES: Go to Step 10. NO: Repair the wiring harness.
10. STEP 10. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Replace the heater control panel. Then go to Step 11. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
11. STEP 11. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Replace the heater control unit. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .

Scheme 7

DTC B1000 will be set when the communication between A/C-ECU and A/C control panel cannot be performed.

1. The A/C-ECU, the A/C control panel, or connector(s) or wiring between the two may be defective.

1. If DTC B1000 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) between the A/C-ECU and the A/C control panel. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU.

1. Malfunction of connector.
2. Malfunction of the harness.
3. Malfunction of the A/C control panel.
4. Malfunction of the A/C-ECU.

Required Special Tool

1. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line. Use scan tool MB991958 to diagnose the CAN bus lines. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to "ON" position. Diagnose the CAN bus line. Q: Is the check result satisfactory? YES: Go to Step 2. NO: Repair the CAN bus lines. Repair the CAN bus lines (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Go to Step 3. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
3. STEP 3. Check A/C control panel connector C-120 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is A/C control panel connector C-120 in good condition? YES: Go to Step 4. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
4. STEP 4. Measure the voltage at A/C control panel connector C-120. Disconnect A/C control panel connector C-120, and measure the voltage at the harness side. Turn the ignition switch to the "ON" position. Measure the voltage between terminal 6 and ground. The measured value should be approximately 12 volts (battery positive voltage). Q: Is the measured voltage approximately 12 volts? YES: Go to Step 6 . NO: Go to Step 5.
5. STEP 5. Check the wiring harness between A/C control panel connector C-120 (terminal 6) and ETACS-ECU connector C-317 (terminal 5). Check the A/C control panel power supply line for open circuit. NOTE: Also check joint connector C-03 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-03 is damaged, repair or replace the connector as described in «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Q: Is the wiring harness between A/C control panel connector C-120 (terminal 6) and ETACS-ECU connector C-317 (terminal 5) in good condition? YES: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) . NO: Repair the wiring harness.
6. STEP 6. Measure the resistance at A/C control panel connector C-120. Disconnect A/C control panel connector C-120, and measure the resistance at the wiring harness side. Measure the resistance value between terminal 7 and ground. The measured value should be 2 ohms or less. Q: Does the measured resistance value correspond with this range? YES: Go to Step 8 . NO: Go to Step 7.
7. STEP 7. Check the wiring harness between A/C control panel connector C-120 (terminal 7) and ground. Check the A/C control panel ground line for open circuit. Q: Is the wiring harness between A/C control panel connector C-120 (terminal 7) and ground in good condition? YES: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) . NO: Repair the wiring harness.
8. STEP 8. Check A/C-ECU connector C-20 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is A/C-ECU connector C-20 in good condition? YES: Go to Step 9. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
9. STEP 9. Check the wiring harness between A/C-ECU connector C-20 (terminal 9) and A/C control panel connector C-120 (terminal 9). Check the A/C control panel signal line for open and short circuit. Q: Is the wiring harness between A/C-ECU connector C-20 (terminal 9) and A/C control panel connector C-120 (terminal 9) in good condition? YES: Go to Step 10. NO: Repair the wiring harness.
10. STEP 10. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Replace the A/C control panel. Then go to Step 11. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
11. STEP 11. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Replace the A/C-ECU. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .

Scheme 8

DTC B1003 will be set when the heater control unit cannot receive the signal of mode selection knob.

1. The heater control unit, the heater control panel, or connector(s) or wiring between the two may be defective.

1. If DTC B1003 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) between the heater control unit and the heater control panel. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU.

1. Malfunction of connector.
2. Malfunction of the harness.
3. Malfunction of the heater control panel.
4. Malfunction of the heater control unit.

Required Special Tool

1. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Diagnose the CAN bus line. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line. (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Go to Step 3. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
3. STEP 3. Check heater control panel connector C-136 and heater control unit connector C-48 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are heater control panel connector C-136 and heater control unit connector C-48 in good condition? YES: Go to Step 4. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
4. STEP 4. Check the wiring harness between heater control unit connector C-48 (terminal 9) and heater control panel connector C-136 (terminal 9). Check the heater control panel signal line for open and short circuit. Q: Is the wiring harness between heater control unit connector C-48 (terminal 9) and heater control panel connector C-136 (terminal 9) in good condition? YES: Go to Step 5. NO: Repair the wiring harness.
5. STEP 5. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Replace the heater control panel. Then go to Step 6. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
6. STEP 6. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Replace the heater control unit. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .

Scheme 9

DTC B1003 will be set when the A/C-ECU cannot receive the signal of mode selection knob.

1. The A/C-ECU, the A/C control panel, or connector(s) or wiring between the two may be defective.

1. If DTC B1003 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) between the A/C-ECU and the A/C control panel. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU.

1. Malfunction of connector.
2. Malfunction of the harness.
3. Malfunction of the A/C control panel.
4. Malfunction of the A/C-ECU.

Required Special Tool

1. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Diagnose the CAN bus line. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line. (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Go to Step 3. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
3. STEP 3. Check A/C control panel connector C-120 and A/C-ECU connector C-20 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are A/C control panel connector C-120 and A/C-ECU connector C-20 in good condition? YES: Go to Step 4. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
4. STEP 4. Check the wiring harness between A/C-ECU connector C-20 (terminal 9) and A/C control panel connector C-120 (terminal 9). Check the A/C control panel signal line for open and short circuit. Q: Is the wiring harness between A/C-ECU connector C-20 (terminal 9) and A/C control panel connector C-120 (terminal 9) in good condition? YES: Go to Step 5. NO: Repair the wiring harness.
5. STEP 5. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Replace the A/C control panel. Then go to Step 6. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
6. STEP 6. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Replace the A/C-ECU. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .

DTC B1018 will be set when the heater control unit cannot receive the signal of temperature adjustment knob.

1. The heater control unit, the heater control panel, or connector(s) or wiring between the two may be defective.

1. If DTC B1018 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) between the heater control unit and the heater control panel. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU.

1. Malfunction of connector.
2. Malfunction of the harness.
3. Malfunction of the heater control panel.
4. Malfunction of the heater control unit.

Required Special Tool

1. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Diagnose the CAN bus line. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line. (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Go to Step 3. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
3. STEP 3. Check heater control panel connector C-136 and heater control unit connector C-48 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are heater control panel connector C-136 and heater control unit connector C-48 in good condition? YES: Go to Step 4. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
4. STEP 4. Check the wiring harness between heater control unit connector C-48 (terminal 9) and heater control panel connector C-136 (terminal 9). Check the heater control panel signal line for open and short circuit. Q: Is the wiring harness between heater control unit connector C-48 (terminal 9) and heater control panel connector C-136 (terminal 9) in good condition? YES: Go to Step 5. NO: Repair the wiring harness.
5. STEP 5. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Replace the heater control panel. Then go to Step 6. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
6. STEP 6. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Replace the heater control unit. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .

DTC B1018 will be set when the A/C-ECU cannot receive the signal of temperature adjustment knob.

1. The A/C-ECU, the A/C control panel, or connector(s) or wiring between the two may be defective.

1. If DTC B1018 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) between the A/C-ECU and the A/C control panel. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU.

1. Malfunction of connector.
2. Malfunction of the harness.
3. Malfunction of the A/C control panel.
4. Malfunction of the A/C-ECU.

Required Special Tool

1. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Diagnose the CAN bus line. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line. (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Go to Step 3. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
3. STEP 3. Check A/C control panel connector C-120 and A/C-ECU connector C-20 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are A/C control panel connector C-120 and A/C-ECU connector C-20 in good condition? YES: Go to Step 4. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
4. STEP 4. Check the wiring harness between A/C-ECU connector C-20 (terminal 9) and A/C control panel connector C-120 (terminal 9). Check the A/C control panel signal line for open and short circuit. Q: Is the wiring harness between A/C-ECU connector C-20 (terminal 9) and A/C control panel connector C-120 (terminal 9) in good condition? YES: Go to Step 5. NO: Repair the wiring harness.
5. STEP 5. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Replace the A/C control panel. Then go to Step 6. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
6. STEP 6. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Replace the A/C-ECU. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .

DTC B1021 will be set when the heater control unit cannot receive the signal of blower knob.

1. The heater control unit, the heater control panel, or connector(s) or wiring between the two may be defective.

1. If DTC B1021 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) between the heater control unit and the heater control panel. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU.

1. Malfunction of connector.
2. Malfunction of the harness.
3. Malfunction of the heater control panel.
4. Malfunction of the heater control unit.

Required Special Tool

1. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Diagnose the CAN bus line. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line. (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Go to Step 3. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
3. STEP 3. Check heater control panel connector C-136 and heater control unit connector C-48 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are heater control panel connector C-136 and heater control unit connector C-48 in good condition? YES: Go to Step 4. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
4. STEP 4. Check the wiring harness between heater control unit connector C-48 (terminal 9) and heater control panel connector C-136 (terminal 9). Check the heater control panel signal line for open and short circuit. Q: Is the wiring harness between heater control unit connector C-48 (terminal 9) and heater control panel connector C-136 (terminal 9) in good condition? YES: Go to Step 5. NO: Repair the wiring harness.
5. STEP 5. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Replace the heater control panel. Then go to Step 6. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
6. STEP 6. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Replace the heater control unit. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .

DTC B1021 will be set when the A/C-ECU cannot receive the signal of blower knob.

1. The A/C-ECU, the A/C control panel, or connector(s) or wiring between the two may be defective.

1. If DTC B1021 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) between the A/C-ECU and the A/C control panel. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU.

1. Malfunction of connector.
2. Malfunction of the harness.
3. Malfunction of the A/C control panel.
4. Malfunction of the A/C-ECU.

Required Special Tool

1. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Diagnose the CAN bus line. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line. (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Go to Step 3. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
3. STEP 3. Check A/C control panel connector C-120 and A/C-ECU connector C-20 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are A/C control panel connector C-120 and A/C-ECU connector C-20 in good condition? YES: Go to Step 4. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
4. STEP 4. Check the wiring harness between A/C-ECU connector C-20 (terminal 9) and A/C control panel connector C-120 (terminal 9). Check the A/C control panel signal line for open and short circuit. Q: Is the wiring harness between A/C-ECU connector C-20 (terminal 9) and A/C control panel connector C-120 (terminal 9) in good condition? YES: Go to Step 5. NO: Repair the wiring harness.
5. STEP 5. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Replace the A/C control panel. Then go to Step 6. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
6. STEP 6. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Replace the A/C-ECU. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .

Scheme 10

1. DTC B1031 is set if there is a short circuit in the air thermo sensor input circuit.
2. DTC B1032 is set if there is a defective connector connection, or if there is an open circuit in the harness.

1. The heater control unit, the air thermo sensor, or connector(s) or wiring between the two may be defective.

1. If DTC B1031 or B1032 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) between the heater control unit and the air thermo sensor. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU.

1. Malfunction of connector.
2. Malfunction of the harness.
3. Malfunction of the air thermo sensor.
4. Malfunction of the heater control unit.

Required Special Tool

1. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

Scheme 11

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Diagnose the CAN bus line. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line. (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Go to Step 3. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
3. STEP 3. Check air thermo sensor connector C-119 and heater control unit connector C-47 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are air thermo sensor connector C-119 and heater control unit connector C-47 in good condition? YES: Go to Step 4. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
4. STEP 4. Check the wiring harness between heater control unit connector C-47 (terminals 22 and 21) and air thermo sensor connector C-119 (terminals 1 and 2). Check the sensor signal line and ground line for open and short circuit. Q: Is the wiring harness between heater control unit connector C-47 (terminals 22 and 21) and air thermo sensor connector C-119 (terminals 1 and 2) in good condition? YES: Go to Step 5. NO: Repair the wiring harness.
5. STEP 5. Check the air thermo sensor. Measure the resistance between connector terminals 1 and 2 under at least two different temperatures. The resistance values should generally match those in the graph. NOTE: The temperature at the check should not exceed the range in the graph. Q: Is the air thermo sensor in good condition? YES: Replace the heater control unit. Then go to Step 6. NO: Replace the air thermo sensor. Then go to Step 6.
6. STEP 6. Recheck for diagnostic trouble code. Check again if the DTC is set. Connect scan tool MB991958 to the data link connector Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Return to Step 1 . NO: The procedure is complete.

Scheme 12

1. DTC B1031 is set if there is a short circuit in the air thermo sensor input circuit.
2. DTC B1032 is set if there is a defective connector connection, or if there is an open circuit in the harness.

1. The A/C-ECU, the air thermo sensor, or connector(s) or wiring between the two may be defective.

1. If DTC B1031 or B1032 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) between the A/C-ECU and the air thermo sensor. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU.

1. Malfunction of connector.
2. Malfunction of the harness.
3. Malfunction of the air thermo sensor.
4. Malfunction of the A/C-ECU.

Required Special Tool

1. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Diagnose the CAN bus line. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line. (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Go to Step 3. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
3. STEP 3. Check air thermo sensor connector C-119 and A/C-ECU connector C-19 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are air thermo sensor connector C-119 and A/C-ECU connector C-19 in good condition? YES: Go to Step 4. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
4. STEP 4. Check the wiring harness between A/C-ECU connector C-19 (terminals 22 and 21) and air thermo sensor connector C-119 (terminals 1 and 2). Check the sensor signal line and ground line for open and short circuit. Q: Is the wiring harness between A/C-ECU connector C-19 (terminals 22 and 21) and air thermo sensor connector C-119 (terminals 1 and 2) in good condition? YES: Go to Step 5. NO: Repair the wiring harness.
5. STEP 5. Check the air thermo sensor. Measure the resistance between connector terminals 1 and 2 under at least two different temperatures. The resistance values should generally match those in the graph. NOTE: The temperature at the check should not exceed the range in the graph. Q: Is the air thermo sensor in good condition? YES: Replace the A/C-ECU. Then go to Step 6. NO: Replace the air thermo sensor. Then go to Step 6.
6. STEP 6. Recheck for diagnostic trouble code. Check again if the DTC is set. Connect scan tool MB991958 to the data link connector Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Return to Step 1 . NO: The procedure is complete.

Scheme 13

1. DTC B1034 is set if there is a short circuit in the ambient air temperature sensor input circuit.
2. DTC B1035 is set if there is a defective connector connection, or if there is an open circuit in the harness.

1. The A/C-ECU, the ambient air temperature sensor, or connector(s) or wiring between the two may be defective.

1. If DTC B1034 or B1035 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) between the A/C-ECU and the ambient air temperature sensor. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU.

1. Malfunction of connector.
2. Malfunction of the harness.
3. Malfunction of the ambient air temperature sensor.
4. Malfunction of the A/C-ECU.

Required Special Tool

1. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

Scheme 14

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Diagnose the CAN bus line. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line. (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Go to Step 3. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
3. STEP 3. Check ambient air temperature sensor connector A-36 and ETACS-ECU connector C-312 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are ambient air temperature sensor connector A-36 and ETACS-ECU connector C-312 in good condition? YES: Go to Step 4. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
4. STEP 4. Check the wiring harness between ambient air temperature sensor connector A-36 (terminals 2 and 1) and ETACS-ECU connector C-312 (terminals 7 and 14). Check the sensor signal line and ground line for open or short circuit. Q: Is the wiring harness between ambient air temperature sensor connector A-36 (terminals 2 and 1) and ETACS-ECU connector C-312 (terminals 7 and 14) in good condition? YES: Go to Step 5. NO: Repair the wiring harness.
5. STEP 5. Check the ambient air temperature sensor. Measure the resistance between connector terminals 1 and 2 under at least two different temperatures. The resistance values should generally match those in the graph. NOTE: The temperature at the check should not exceed the range in the graph. Q: Is the ambient air temperature sensor in good condition? YES: Replace the A/C-ECU. Then go to Step 6. NO: Replace the ambient air temperature sensor. Then go to Step 6.
6. STEP 6. Recheck for diagnostic trouble code. Check again if the DTC is set. Connect scan tool MB991958 to the data link connector Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Return to Step 1 . NO: The procedure is complete.

Scheme 15

DTC B1079 will be set when the A/C pressure sensor detects the refrigerant pressure of specified level or less.

Note. When DTC B1079 is set, the A/C indicator of A/C control panel flashes.

1. The refrigerant amount is not at the specified level, or the wiring harness or connector between the A/C-ECU and A/C pressure sensor, and the A/C-ECU itself or A/C pressure sensor itself may have failed.

1. If DTC B1079 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) between the A/C-ECU and the A/C pressure sensor. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU.

1. Malfunction of connector.
2. Malfunction of the harness.
3. Malfunction of the A/C pressure sensor.
4. Malfunction of the A/C-ECU.

Required Special Tool

1. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

Scheme 16

Scheme 17

Scheme 18

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Diagnose the CAN bus line. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line. (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Go to Step 3. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
3. STEP 3. Check A/C pressure sensor connector A-42 and A/C-ECU connector C-20 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are air A/C pressure sensor connector A-42 and A/C-ECU connector C-20 in good condition? YES: Go to Step 4. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
4. STEP 4. Check the wiring harness between A/C-ECU connector C-20 (terminals 20, 16 and 19) and A/C pressure sensor connector A-42 (terminals 3, 2 and 1). NOTE: Also check intermediate connector C-128 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-128 is damaged, repair or replace the connector as described in «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Check the sensor signal line and ground line for open or short circuit. Q: Is the wiring harness between A/C-ECU connector C-20 (terminals 20, 16 and 19) and A/C pressure sensor connector A-42 (terminals 3, 2 and 1) in good condition? YES: Go to Step 5. NO: Repair the wiring harness.
5. STEP 5. Check the A/C pressure sensor operation. Assemble a gauge manifold on the high pressure service valve. Disconnect the A/C pressure sensor connector and connect special tool test harness MB991658 as shown in the illustration. Turn ON the engine and then turn ON the A/C switch. At this time, check to see that the voltage of A/C pressure sensor terminal No. 2 reflects the specifications of the figure. NOTE: The allowance shall be defined as ±5%. Q: Is the A/C pressure sensor operating properly? YES: Go to Step 6. NO: Replace the A/C pressure sensor. Then go to Step 7 .
6. STEP 6. Check the refrigerant level. Use the refrigerant recovery station to remove all of the refrigerant, and then calculate the amount of the refrigerant and charge it. Q: Is the refrigerant level correct? YES: Go to Step 7. NO: Correct the refrigerant level (Refer to «ON-VEHICLE SERVICE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution) ). Then go to Step 7.
7. STEP 7. Recheck for diagnostic trouble code. Check again if the DTC is set. Connect scan tool MB991958 to the data link connector Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Return to Step 1 . NO: The procedure is complete.

Scheme 19

DTC B2214 will be set when the heater control unit detects the heater control panel abnormality.

1. The heater control unit, the heater control panel, or connector(s) or wiring between the two may be defective.

1. If DTC B2214 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) between the heater control unit and the heater control panel. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU.

1. Malfunction of connector.
2. Malfunction of the harness.
3. Malfunction of the heater control panel.
4. Malfunction of the heater control unit.

Required Special Tool

1. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Diagnose the CAN bus line. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line. (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Go to Step 3. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
3. STEP 3. Check heater control panel connector C-136 and heater control unit connector C-48 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are heater control panel connector C-136 and heater control unit connector C-48 in good condition? YES: Go to Step 4. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
4. STEP 4. Check the wiring harness between heater control unit connector C-48 (terminal 9) and heater control panel connector C-136 (terminal 9). Check the heater control panel signal line for open and short circuit. Q: Is the wiring harness between heater control unit connector C-48 (terminal 9) and heater control panel connector C-136 (terminal 9) in good condition? YES: Go to Step 5. NO: Repair the wiring harness.
5. STEP 5. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Replace the heater control panel. Then go to Step 6. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
6. STEP 6. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Replace the heater control unit. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .

DTC B2214 will be set when the A/C-ECU detects the A/C control panel abnormality.

1. The A/C-ECU, the A/C control panel, or connector(s) or wiring between the two may be defective.

1. If DTC B2214 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) between the A/C-ECU and the A/C control panel. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU.

1. Malfunction of connector.
2. Malfunction of the harness.
3. Malfunction of the A/C control panel.
4. Malfunction of the A/C-ECU.

Required Special Tool

1. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Diagnose the CAN bus line. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line. (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Go to Step 3. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
3. STEP 3. Check A/C control panel connector C-120 and A/C-ECU connector C-20 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are A/C control panel connector C-120 and A/C-ECU connector C-20 in good condition? YES: Go to Step 4. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
4. STEP 4. Check the wiring harness between A/C-ECU connector C-20 (terminal 9) and A/C control panel connector C-120 (terminal 9). Check the A/C control panel signal line for open and short circuit. Q: Is the wiring harness between A/C-ECU connector C-20 (terminal 9) and A/C control panel connector C-120 (terminal 9) in good condition? YES: Go to Step 5. NO: Repair the wiring harness.
5. STEP 5. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Replace the A/C control panel. Then go to Step 6. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .
6. STEP 6. Recheck for diagnostic trouble code. Recheck if the DTC is set. Erase the DTC. Turn the ignition switch to "ON" position. Check if the DTC is set. Q: Is the DTC set? YES: Replace the A/C-ECU. NO: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .

DTC U1415: Coding Not Completed

TROUBLE JUDGMENT

The A/C-ECU or heater control unit < vehicles without A/C > receives the vehicle information signals from the ETACS-ECU via the CAN bus lines. If incorrect global coding data is received or coding data cannot be received with the ignition switch turned ON when the coding confirmation is completed, diagnostic trouble code U1415 is stored.

TROUBLESHOOTING HINTS

1. Malfunction of the ETACS-ECU
2. Malfunction of the A/C-ECU or heater control unit < vehicles without A/C >
3. Damaged wiring harness or connectors

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe
3. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: V.C.I. MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Diagnose the CAN bus line. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line. (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Using scan tool MB991958 read the ETACS-ECU diagnostic trouble code. Check whether an ETACS DTC. Turn the ignition switch to the "ON" position. Check for the DTC related to the ETACS-ECU. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Diagnose the ETACS-ECU (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#electronic-time-and-alarm-control-system-etacs-except-lancer-evolution__diagnostic-trouble-code-chart) ). NO: Go to Step 3.
3. STEP 3. Using scan tool MB991958, check for any diagnostic trouble code. Check if a DTC, which relates to CAN communication-linked systems below, is set. WCM < vehicles with WCM > B2204: Coding data unmatched KOS < vehicles with KOS > B2204: Coding data unmatched Turn the ignition switch to the "ON" position. Check for a DTC related to the relevant system. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Go to Step 5 . NO: Go to Step 4.
4. STEP 4. Recheck for diagnostic trouble code. Check again if the DTC is set. Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Replace the ETACS-ECU. On completion, check that the DTC is not reset. NO: A poor connection, open circuit or other intermittent malfunction is present in the lines between the ETACS-ECU and the A/C-ECU or heater control unit < vehicles without A/C > (Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) ).
5. STEP 5. Recheck for diagnostic trouble code. Check again if the DTC is set. Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Replace the A/C-ECU or heater control unit < vehicles without A/C >. On completion, check that the DTC is not reset. NO: A poor connection, open circuit or other intermittent malfunction is present in the lines between the ETACS-ECU and the A/C-ECU or heater control unit < vehicles without A/C > (Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) ).

DTC U0019: Bus Off (CAN1)

DTC U0019 will be stored when the A/C-ECU or heater control unit < vehicles without A/C > ceases CAN communication (bus off) and then resumes the communication when the ignition switch is turned to the "LOCK" (OFF) position.

TECHNICAL DESCRIPTION (COMMENT)

The wiring harness wire or connectors may have loose, corroded, or damage terminals, or terminals pushed back in the connector, or the A/C-ECU or heater control unit < vehicles without A/C > may be defective.

1. Damaged wiring harness or connectors
2. Malfunction of the A/C-ECU or heater control unit < vehicles without A/C >

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe
3. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: V.C.I. MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Diagnose the CAN bus line. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line. (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Recheck for diagnostic trouble code. Check again if the DTC is set. Connect scan tool MB991958 to the data link connector Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Replace the A/C-ECU or heater control unit < vehicles without A/C >. On completion, check that the DTC is not reset. NO: There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .)

DTC U0141: ETACS-ECU Time-out

The A/C-ECU or heater control unit < vehicles without A/C > receives air conditioning operation-related signals from the ETACS-ECU via the CAN bus lines. If the ECU cannot receive any of the air conditioning control-related signals from the ETACS-ECU, the diagnostic trouble code U0141 is stored.

1. Connector(s) or wiring harness in the CAN bus lines between the ETACS-ECU and the A/C-ECU or heater control unit < vehicles without A/C >, the power supply system to the ETACS-ECU, the ETACS-ECU itself, or the A/C-ECU or heater control unit < vehicles without A/C > may be defective.

1. If DTC U0141 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) in the CAN bus line between the A/C-ECU or heater control unit < vehicles without A/C > and the ETACS-ECU, and the power supply system to the ETACS-ECU. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU. NOTE: For a past trouble, you cannot find it by the scan tool CAN bus diagnostics even if there is a failure in CAN bus lines. In this case, refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ) and check the CAN bus lines. You can narrow down the possible cause of the trouble by referring to the DTC, which is set regarding the CAN communication-linked ECUs (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ).

1. Malfunction of the A/C-ECU or heater control unit < vehicles without A/C >
2. Malfunction of the ETACS-ECU
3. Damaged wiring harness or connectors

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe
3. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: V.C.I. MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Diagnose the CAN bus line. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line. (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Using scan tool MB991958 read the ETACS-ECU diagnostic trouble code. Check whether an ETACS-ECU DTCs are set or not. Turn the ignition switch to the "ON" position. Check for ETACS-ECU DTCs. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Diagnose the ETACS-ECU (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#electronic-time-and-alarm-control-system-etacs-except-lancer-evolution__diagnostic-trouble-code-chart) ). NO: Go to Step 3.
3. STEP 3. Using scan tool MB991958, check for any diagnostic trouble code. Check if a DTC, which relates to CAN communication-linked systems below, is set. Combination meter DTC indicating a time-out error related to the engine or automatic transaxle control system Turn the ignition switch to the "ON" position. Check for a DTC related to the relevant system. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Go to Step 4. NO: Go to Step 5 .
4. STEP 4. Recheck for diagnostic trouble code. Check again if the DTC is set. Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Replace the ETACS-ECU. On completion, check that the DTC is not reset. NO: There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .)
5. STEP 5. Recheck for diagnostic trouble code. Check again if the DTC is set. Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Replace the A/C-ECU or heater control unit < vehicles without A/C >. On completion, check that the DTC is not reset. NO: There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .)

DTC U0151: SRS-ECU Time-out

The A/C-ECU or heater control unit < vehicles without A/C > receives air conditioning operation-related signals from the SRS-ECU via the CAN bus lines. If any of the air conditioning control-related signals from the SRS-ECU cannot be received, the diagnostic trouble code U0151 is stored.

1. Connector(s) or wiring harness in the CAN bus lines between the SRS-ECU and the A/C-ECU or heater control unit < vehicles without A/C >, the power supply system to the SRS-ECU, the SRS-ECU itself, or the A/C-ECU or heater control unit < vehicles without A/C > may be defective.

1. If DTC U0151 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) in the CAN bus line between the A/C-ECU or heater control unit < vehicles without A/C > and the SRS-ECU, and the power supply system to the SRS-ECU. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU.

Note. For a past trouble, you cannot find it by the scan tool CAN bus diagnostics even if there is a failure in CAN bus lines. In this case, refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ) and check the CAN bus lines. You can narrow down the possible cause of the trouble by referring to the DTC, which is set regarding the CAN communication-linked ECUs (Refer to CAN BUS DIAGNOSTICS TABLE ).

1. Malfunction of the SRS-ECU
2. Malfunction of the A/C-ECU or heater control unit < vehicles without A/C >
3. Damaged wiring harness or connectors

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe
3. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: V.C.I. MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Diagnose the CAN bus line. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line. (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Using scan tool MB991958 read the SRS-ECU diagnostic trouble code. Check whether an SRS-ECU DTCs are set or not. Turn the ignition switch to the "ON" position. Check for SRS-ECU DTCs. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Diagnose the SRS-ECU (Refer to «DIAGNOSTIC TROUBLE CODE CHART < SRS-ECU >»(/mitsubishi/lancer-evolution/x-2007-2016/remont/airbag/#supplemental-restraint-system-srs-except-lancer-evolution) ). NO: Go to Step 3.
3. STEP 3. Using scan tool MB991958, check for any diagnostic trouble code. Check if a DTC, which relates to CAN communication-linked systems below, is set. ETACS-ECU DTC indicating a time-out error related to the SRS-ECU system Turn the ignition switch to the "ON" position. Check for a DTC related to the relevant system. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Go to Step 4. NO: Go to Step 5 .
4. STEP 4. Recheck for diagnostic trouble code. Check again if the DTC is set. Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Replace the SRS-ECU. On completion, check that the DTC is not reset. NO: There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .)
5. STEP 5. Recheck for diagnostic trouble code. Check again if the DTC is set. Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Replace the A/C-ECU or heater control unit < vehicles without A/C >. On completion, check that the DTC is not reset. NO: There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .)

DTC U0154: Occupant classification ECU time out

The A/C-ECU or heater control unit < vehicles without A/C > receives air conditioning operation-related signals from the SRS-ECU via the CAN bus lines. If any of the air conditioning control-related signals from the SRS-ECU cannot be received, the diagnostic trouble code U0154 is stored.

1. Connector(s) or wiring harness in the CAN bus lines between the SRS-ECU and the A/C-ECU, the power supply system to the SRS-ECU, the SRS-ECU itself, or the A/C-ECU or heater control unit < vehicles without A/C > may be defective.

1. If DTC U0154 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) in the CAN bus line between the A/C-ECU or heater control unit < vehicles without A/C > and the SRS-ECU, and the power supply system to the SRS-ECU. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU. NOTE: For a past trouble, you cannot find it by the scan tool CAN bus diagnostics even if there is a failure in CAN bus lines. In this case, refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ) and check the CAN bus lines. You can narrow down the possible cause of the trouble by referring to the DTC, which is set regarding the CAN communication-linked ECUs (Refer to «CAN BUS DIAGNOSTICS TABLE»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__can-bus-diagnostics-table) ).

1. Malfunction of the SRS-ECU
2. Malfunction of the A/C-ECU or heater control unit < vehicles without A/C >
3. Damaged wiring harness or connectors

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe
3. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: V.C.I. MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Diagnose the CAN bus line. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line. (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Using scan tool MB991958 read the SRS-ECU diagnostic trouble code. Check whether an SRS-ECU DTCs are set or not. Turn the ignition switch to the "ON" position. Check for SRS-ECU DTCs. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Diagnose the SRS-ECU (Refer to «DIAGNOSTIC TROUBLE CODE CHART < Occupant classification-ECU >»(/mitsubishi/lancer-evolution/x-2007-2016/remont/airbag/#supplemental-restraint-system-srs-except-lancer-evolution) ). NO: Go to Step 3.
3. STEP 3. Using scan tool MB991958, check for any diagnostic trouble code. Check if a DTC, which relates to CAN communication-linked systems below, is set. ETACS-ECU DTC indicating a time-out error related to the SRS-ECU system Turn the ignition switch to the "ON" position. Check for a DTC related to the relevant system. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Go to Step 4. NO: Go to Step 5 .
4. STEP 4. Recheck for diagnostic trouble code. Check again if the DTC is set. Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Replace the SRS-ECU. On completion, check that the DTC is not reset. NO: There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .)
5. STEP 5. Recheck for diagnostic trouble code. Check again if the DTC is set. Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Replace the A/C-ECU or heater control unit < vehicles without A/C >. On completion, check that the DTC is not reset. NO: There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .)

DTC U0155: Combination meter Time-out

The A/C-ECU or heater control unit < vehicles without A/C > receives the air conditioning control-related signals from the combination meter via the CAN bus lines. If any of the air conditioning control-related signals from the combination meter cannot be received, the diagnostic trouble code U0155 is stored.

1. Connector(s) or wiring harness in the CAN bus lines between the combination meter and the A/C-ECU or heater control unit < vehicles without A/C >, the power supply system to the combination meter, the combination meter itself, or the A/C-ECU or heater control unit < vehicles without A/C > may be defective.

1. If DTC U0155 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) in the CAN bus line between the A/C-ECU or heater control unit < vehicles without A/C > and the combination meter, and the power supply system to the combination meter. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU. NOTE: For a past trouble, you cannot find it by the scan tool CAN bus diagnostics even if there is a failure in CAN bus lines. In this case, refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ) and check the CAN bus lines. You can narrow down the possible cause of the trouble by referring to the DTC, which is set regarding the CAN communication-linked ECUs (Refer to «EXPLANATION ABOUT THE SCAN TOOL (M.U.T.-III) CAN BUS DIAGNOSTICS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__explanation-about-the-scan-tool-mut-iii) ).

1. Malfunction of the combination meter
2. Malfunction of the A/C-ECU or heater control unit < vehicles without A/C >
3. Damaged wiring harness or connectors

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe
3. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: V.C.I. MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Diagnose the CAN bus line. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Using scan tool MB991958 read the combination meter diagnostic trouble code. Check whether a combination meter DTCs are set or not. Turn the ignition switch to the "ON" position. Check for combination meter DTCs. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Diagnose the combination meter (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/gauges-instrument-panels/#combination-meter-except-lancer-evolution__diagnostic-trouble-code-chart) ). NO: Go to Step 3.
3. STEP 3. Using scan tool MB991958, check for any diagnostic trouble code. Check if a DTC, which relates to CAN communication-linked systems below, is set. ETACS-ECU DTC indicating a time-out error related to the combination meter system Turn the ignition switch to the "ON" position. Check for a DTC related to the relevant system. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Go to Step 4. NO: Go to Step 5 .
4. STEP 4. Recheck for diagnostic trouble code. Check again if the DTC is set. Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Replace the combination meter. On completion, check that the DTC is not reset. NO: There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .)
5. STEP 5. Recheck for diagnostic trouble code. Check again if the DTC is set. Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Replace the A/C-ECU or heater control unit < vehicles without A/C >. On completion, check that the DTC is not reset. NO: There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .)

DTC U0168: WCM Time-out

The A/C-ECU or heater control unit < vehicles without A/C > receives the air conditioning control-related signals from the WCM-ECU via the CAN bus lines. If any of the air conditioning control-related signals from the WCM-ECU cannot be received, diagnostic trouble code U0168 is stored.

1. Connector(s) or wiring harness in the CAN bus lines between the WCM-ECU and the A/C-ECU or heater control unit < vehicles without A/C >, the power supply system to the WCM-ECU, the WCM-ECU itself, or the A/C-ECU or heater control unit < vehicles without A/C > may be defective.

1. If DTC U0168 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) in the CAN bus line between the A/C-ECU or heater control unit < vehicles without A/C > and the WCM-ECU, and the power supply system to the WCM-ECU. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU.

Note. For a past trouble, you cannot find it by the scan tool CAN bus diagnostics even if there is a failure in CAN bus lines. In this case, refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ) and check the CAN bus lines. You can narrow down the possible cause of the trouble by referring to the DTC, which is set regarding the CAN communication-linked ECUs (Refer to EXPLANATION ABOUT THE SCAN TOOL (M.U.T.-III) CAN BUS DIAGNOSTICS ).

1. Malfunction of the WCM-ECU
2. Malfunction of the A/C-ECU or heater control unit < vehicles without A/C >
3. Damaged wiring harness or connectors

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe
3. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: V.C.I. MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Diagnose the CAN bus line. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Using scan tool MB991958 read the WCM-ECU diagnostic trouble code. Check whether an WCM-ECU DTCs are set or not. Turn the ignition switch to the "ON" position. Check for WCM-ECU DTCs. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Go to Step 3. NO: Diagnose the WCM-ECU (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#wireless-control-module-wcm-except-lancer-evolution__diagnostic-trouble-code-chart) ).
3. STEP 3. Using scan tool MB991958, check for any diagnostic trouble code. Check if a DTC, which relates to CAN communication-linked systems below, is set. ETACS-ECU DTC indicating a time-out error related to the WCM-ECU system Turn the ignition switch to the "ON" position. Check for a DTC related to the relevant system. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Go to Step 4. NO: Go to Step 5 .
4. STEP 4. Recheck for diagnostic trouble code. Check again if the DTC is set. Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Replace the WCM-ECU. On completion, check that the DTC is not reset. NO: There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .)
5. STEP 5. Recheck for diagnostic trouble code. Check again if the DTC is set. Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Replace the A/C-ECU or heater control unit < vehicles without A/C >. On completion, check that the DTC is not reset. NO: There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .)

DTC U0184: Audio Time-out

The A/C-ECU or heater control unit < vehicles without A/C > receives air conditioning operation-related signals from the audio via the CAN bus lines. If any of the air conditioning control-related signals from the audio cannot be received, the diagnostic trouble code U0184 is stored.

1. Connector(s) or wiring harness in the CAN bus lines between the Audio and the A/C-ECU or heater control unit < vehicles without A/C >, the power supply system to the Audio, the Audio itself, or the A/C-ECU or heater control unit < vehicles without A/C > may be defective.

1. If DTC U0184 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) in the CAN bus line between the A/C-ECU or heater control unit < vehicles without A/C > and the Audio, and the power supply system to the Audio. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU. NOTE: For a past trouble, you cannot find it by the scan tool CAN bus diagnostics even if there is a failure in CAN bus lines. In this case, refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ) and check the CAN bus lines. You can narrow down the possible cause of the trouble by referring to the DTC, which is set regarding the CAN communication-linked ECUs (Refer to «EXPLANATION ABOUT THE SCAN TOOL (M.U.T.-III) CAN BUS DIAGNOSTICS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__explanation-about-the-scan-tool-mut-iii) ).

1. Malfunction of the Audio
2. Malfunction of the A/C-ECU or heater control unit < vehicles without A/C >
3. Damaged wiring harness or connectors

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe
3. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: V.C.I. MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Diagnose the CAN bus line. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Using scan tool MB991958 read the Audio diagnostic trouble code. Check whether an audio DTCs are set or not. Turn the ignition switch to the "ON" position. Check for Audio DTCs. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Diagnose the Audio (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/entertainment-systems/#satellite-radio-tuner-except-lancer-evolution__diagnostic-trouble-code-chart) ). NO: Go to Step 3.
3. STEP 3. Using scan tool MB991958, check for any diagnostic trouble code. Check if a DTC, which relates to CAN communication-linked systems below, is set. ETACS-ECU DTC indicating a time-out error related to the Audio system Turn the ignition switch to the "ON" position. Check for a DTC related to the relevant system. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Go to Step 4. NO: Go to Step 5 .
4. STEP 4. Recheck for diagnostic trouble code. Check again if the DTC is set. Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Replace the Audio. On completion, check that the DTC is not reset. NO: There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .)
5. STEP 5. Recheck for diagnostic trouble code. Check again if the DTC is set. Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Replace the A/C-ECU or heater control unit < vehicles without A/C >. On completion, check that the DTC is not reset. NO: There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .)

DTC U0195: Satellite radio tuner CAN timeout

The A/C-ECU or heater control unit < vehicles without A/C > receives air conditioning operation-related signals from the satellite radio via the CAN bus lines. If any of the air conditioning control-related signals from the satellite radio cannot be received, the diagnostic trouble code U0195 is stored.

1. Connector(s) or wiring harness in the CAN bus lines between the Satellite Radio and the A/C-ECU or heater control unit < vehicles without A/C >, the power supply system to the Satellite Radio, the Satellite Radio itself, or the A/C-ECU or heater control unit < vehicles without A/C > may be defective.

1. If DTC U0195 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) in the CAN bus line between the A/C-ECU or heater control unit < vehicles without A/C > and the Satellite Radio, and the power supply system to the Satellite Radio. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU. NOTE: For a past trouble, you cannot find it by the scan tool CAN bus diagnostics even if there is a failure in CAN bus lines. In this case, refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) ) and check the CAN bus lines. You can narrow down the possible cause of the trouble by referring to the DTC, which is set regarding the CAN communication-linked ECUs (Refer to «EXPLANATION ABOUT THE SCAN TOOL (M.U.T.-III) CAN BUS DIAGNOSTICS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__explanation-about-the-scan-tool-mut-iii) ).

1. Malfunction of the Satellite Radio
2. Malfunction of the A/C-ECU or heater control unit < vehicles without A/C >
3. Damaged wiring harness or connectors

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe
3. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: V.C.I. MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Diagnose the CAN bus line. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus line (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Using scan tool MB991958 read the Satellite Radio diagnostic trouble code. Check whether an satellite radio DTCs are set or not. Turn the ignition switch to the "ON" position. Check for Satellite Radio DTCs. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Diagnose the Satellite Radio (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/entertainment-systems/#satellite-radio-tuner-except-lancer-evolution__diagnostic-trouble-code-chart) ). NO: Go to Step 3.
3. STEP 3. Using scan tool MB991958, check for any diagnostic trouble code. Check if a DTC, which relates to CAN communication-linked systems below, is set. ETACS-ECU DTC indicating a time-out error related to the Satellite Radio system Turn the ignition switch to the "ON" position. Check for a DTC related to the relevant system. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Go to Step 4. NO: Go to Step 5 .
4. STEP 4. Recheck for diagnostic trouble code. Check again if the DTC is set. Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Replace the Satellite Radio. On completion, check that the DTC is not reset. NO: There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .)
5. STEP 5. Recheck for diagnostic trouble code. Check again if the DTC is set. Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Replace the A/C-ECU or heater control unit < vehicles without A/C >. On completion, check that the DTC is not reset. NO: There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) .)

SYMPTOM CHART < Vehicles without A/C >

SYMPTOM CHART (VEHICLES WITHOUT A/C)

Scheme 20

The heater control unit power system may be defective if the air conditioning, defogger, and outside/inside air selection damper motor all do not operate normally.

1. Malfunction of the heater control unit
2. Damaged harness wires or connectors

Required Special Tool

1. MB991223: Test Harness Set

Scheme 21

Scheme 22

Scheme 23

1. STEP 1. Check heater control unit connector C-48 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is heater control unit connector C-48 in good condition? YES: Go to Step 2. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Check that the A/C works normally.
2. STEP 2. Measure the voltage at heater control unit connector C-48. Disconnect heater control unit connector C-48 and measure the voltage at the harness side. Turn the ignition switch to the "ON" position. Measure the voltage between terminal 15 and ground. The measured value should be approximately 12 volts (battery positive voltage). Q: Is the measured voltage approximately 12 volts? YES: Go to Step 5 . NO: Go to Step 3.
3. STEP 3. Check ETACS-ECU connector C-317 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is ETACS-ECU connector C-317 in good condition? YES: Go to Step 4. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Check that the A/C works normally.
4. STEP 4. Check the wiring harness between heater control unit connector C-48 (terminal 15) and ETACS-ECU connector C-317 (terminal 5). Check the heater control unit power supply line for open circuit. NOTE: Also check joint connector C-03 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-03 is damaged, repair or replace the connector as described in «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Q: Is the wiring harness between heater control unit connector C-48 (terminal 15) and ETACS-ECU connector C-317 (terminal 5) in good condition? YES: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) . NO: Repair the wiring harness. Check that the A/C works normally.
5. STEP 5. Measure the voltage at heater control unit connector C-48. Disconnect heater control unit connector C-48 and measure the voltage at the harness side. Measure the voltage between terminal 13 and ground. The measured value should be approximately 12 volts (battery positive voltage). Q: Is the measured voltage approximately 12 V? YES: Go to Step 7 . NO: Go to Step 6.
6. STEP 6. Check the wiring harness between heater control unit connector C-48 (terminal 13) and the fusible link (36). NOTE: Also check ETACS-ECU connectors C-307 and C-317 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If ETACS-ECU connectors C-307 and C-317 is damaged, repair or replace the connector as described in «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Check the heater control unit power supply line for open circuit. Q: Is the wiring harness between heater control unit connector C-48 (terminal 13) and the fusible link (36) in good condition? YES: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) . NO: Repair the wiring harness. Check that the A/C works normally.
7. STEP 7. Measure the resistance at heater control unit connector C-48. Disconnect heater control unit connector C-48, and measure at the wiring harness side. Measure the resistance between terminal 14 and ground. The measured value should be 2 ohms or less. Q: Does the measured resistance value correspond with this range? YES: Replace the heater control unit, and check that the A/C works normally. NO: Go to Step 8.
8. STEP 8. Check the wiring harness between heater control unit connector C-48 (terminal 14) and the ground. Check the heater control unit ground line for open circuit. Q: Is the wiring harness between heater control unit connector C-48 (terminal 14) and ground in good condition? YES: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) . NO: Repair the wiring harness. Check that the A/C works normally.

Scheme 24

CIRCUIT OPERATION

If the blower motor does not operate, the blower relay system is suspected.

1. Malfunction of the power transistor
2. Malfunction of the blower motor
3. Malfunction of the heater control unit
4. Damaged wiring harness or connectors

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

Scheme 25

Scheme 26

Scheme 27

1. STEP 1. Check blower motor connector C-113 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is blower motor connector C-113 in good condition? YES: Go to Step 2. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . The blower motor should operate normally.
2. STEP 2. Measure the voltage at blower motor connector C-113. Disconnect blower motor connector C-113, and measure the voltage at the wiring harness side. Turn the ignition switch to the "ON" position. Turn the blower switch to the "Maximum air volume" position. Measure the voltage between terminal 1 and ground. The measured value should be approximately 12 volts (battery positive voltage). Q: Is the measured voltage approximately 12 volts? YES: Go to Step 3. NO: Refer to «INSPECTION PROCEDURE 10, "BLOWER MOTOR POWER SUPPLY SYSTEM»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution) ."
3. STEP 3. Check blower motor connector C-113 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is blower motor connector C-113 in good condition? YES: Go to Step 4. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . The blower motor should operate normally.
4. STEP 4. Check the blower fan and motor operation. Check that the motor turns when applying battery power between the connector terminals. Also check to see that there is no abnormal sound emitted from the motor at this time. Q: Is there any abnormal noise? YES: Go to Step 5. NO: Replace the blower relay. The blower motor should operate normally.
5. STEP 5. Check heater control unit connector C-48 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is heater control unit connector C-48 in good condition? YES: Go to Step 6. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . The blower motor should operate normally.
6. STEP 6. Check the wiring harness between heater control unit connector C-48 (terminal 1) and blower motor connector C-113 (terminal 2). Check the heater control unit signal line for open and short circuit. Q: Is the wiring harness between heater control unit connector C-48 (terminal 1) and blower motor connector C-113 (terminal 2) in good condition? YES: Go to Step 7. NO: Repair the wiring harness. The blower motor should operate normally.
7. STEP 7. Check power transistor connector C-112 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is power transistor connector C-112 in good condition? YES: Go to Step 8. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . The blower motor should operate normally.
8. STEP 8. Measure the resistance at power transistor connector C-112. Disconnect power transistor connector C-112, and measure the resistance at the wiring harness side. Measure the resistance value between terminal 1 and ground. OK: The measured value should be 2 ohms or less Q: Does the measured resistance value correspond with this range? YES: Go to Step 10 . NO: Go to Step 9.
9. STEP 9. Check the wiring harness between power transistor connector C-112 (terminal 1) and ground. Check the power transistor ground line for open circuit. Q: Is the wiring harness between power transistor connector C-112 (terminal 1) and ground in good condition? YES: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) . NO: Repair the wiring harness. The blower motor should operate normally.
10. STEP 10. Check the wiring harness between heater control unit connector C-48 (terminals 1 and 2) and power transistor connector C-112 (terminals 2 and 4). Check the heater control unit signal line for open and short circuit. Q: Is the wiring harness between heater control unit connector C-48 (terminals 1 and 2) and power transistor connector C-112 (terminals 2 and 4) in good condition? YES: Go to Step 11. NO: Repair the wiring harness. The blower motor should operate normally.
11. STEP 11. Replace the power transistor and check the trouble symptom again Check the trouble symptom again. Q: Is the check result satisfactory? YES: The procedure is complete. NO: Replace the heater control unit.

If the blower motor speed cannot be changed, the power transistor circuit is suspected.

1. Malfunction of the power transistor
2. Malfunction of the heater control unit
3. Damaged wiring harness or connectors

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

Scheme 28

1. STEP 1. Check power transistor connector C-112 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is power transistor connector C-112 in good condition? YES: Go to Step 2. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . The blower motor should operate normally.
2. STEP 2. Measure the resistance at power transistor connector C-112. Disconnect power transistor connector C-112, and measure the resistance at the wiring harness side. Measure the resistance value between terminal 1 and ground. OK: The measured value should be 2 ohms or less Q: Does the measured resistance value correspond with this range? YES: Go to Step 4 . NO: Go to Step 3.
3. STEP 3. Check the wiring harness between power transistor connector C-112 (terminal 1) and ground. Check the power transistor ground line for open circuit. Q: Is the wiring harness between power transistor connector C-112 (terminal 1) and ground in good condition? YES: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) . NO: Repair the wiring harness. The blower motor should operate normally.
4. STEP 4. Check heater control unit connector C-48 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is heater control unit connector C-48 in good condition? YES: Go to Step 5. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . The blower motor should operate normally.
5. STEP 5. Check the wiring harness between heater control unit connector C-48 (terminals 1 and 2) and power transistor connector C-112 (terminals 2 and 4). Check the heater control unit signal line for open and short circuit. Q: Is the wiring harness between heater control unit connector C-48 (terminals 1 and 2) and power transistor connector C-112 (terminals 2 and 4) in good condition? YES: Go to Step 6. NO: Repair the wiring harness. The blower motor should operate normally.
6. STEP 6. Replace the power transistor and check the trouble symptom again Check the trouble symptom again. Q: Is the check result satisfactory? YES: The procedure is complete. NO: Replace the heater control unit.

Scheme 29

If the outside/inside air selection damper control motor does not operate normally, the outside/inside air selection damper control motor system may be defective.

1. Malfunction of the outside/inside air selection damper control motor
2. Malfunction of the heater control unit
3. Damaged wiring harness or connectors

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe
3. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: V.C.I. MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, check for diagnostic trouble code. CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Check if an heater control unit DTC is set. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__diagnostic-trouble-code-chart) . NO: Go to Step 2.
2. STEP 2. Check outside/inside air selection damper control motor connector C-109 and heater control unit connector C-47 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are outside/inside air selection damper control motor connector C-109 and heater control unit connector C-47 in good condition? YES: Go to Step 3. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Check that the A/C works normally.
3. STEP 3. Check the wiring harness between heater control unit connector C-47 (terminals 26, 25, 27, 24 and 29) and outside/inside air selection damper control motor connector C-109 (terminals 2, 5, 4, 1 and 3). Check the heater control unit signal line for open and short circuit. Q: Are the wiring harness between heater control unit connector C-47 (terminals 26, 25, 27, 24 and 29) and outside/inside air selection damper control motor connector C-109 (terminals 2, 5, 4, 1 and 3) in good condition? YES: Go to Step 4. NO: Repair the wiring harness. Check that the A/C works normally.
4. STEP 4. Replace the outside/inside air selection damper control motor and check the trouble symptom again Check the trouble symptom again. Q: Is the check result satisfactory? YES: The procedure is complete. NO: Replace the heater control unit.

Scheme 30

If the air outlet temperature cannot be adjusted, the air mixing damper control motor circuit may be failed.

1. Malfunction of the air mixing damper control motor
2. Malfunction of the heater control unit
3. Damaged wiring harness or connectors

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe
3. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: V.C.I. MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, check for diagnostic trouble code. Check if an heater control unit DTC is set. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__diagnostic-trouble-code-chart) . NO: Go to Step 2.
2. STEP 2. Check air mixing damper control motor connector C-118 and heater control unit connector C-47 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are air mixing damper control motor connector C-118 and heater control unit connector C-47 in good condition? YES: Go to Step 3. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Check that the A/C works normally.
3. STEP 3. Check the wiring harness between heater control unit connector C-47 (terminals 29, 35, 36, 34 and 28) and air mixing damper control motor connector C-118 (terminals 3, 2, 5, 4 and 1). Check the heater control unit signal line for open and short circuit. Q: Are the wiring harness between heater control unit connector C-47 (terminals 29, 35, 36, 34 and 28) and air mixing damper control motor connector C-118 (terminals 3, 2, 5, 4 and 1) in good condition? YES: Go to Step 4. NO: Repair the wiring harness. Check that the A/C works normally.
4. STEP 4. Replace the air mixing damper control motor and check the trouble symptom again Check the trouble symptom again. Q: Is the check result satisfactory? YES: The procedure is complete. NO: Replace the heater control unit.

Scheme 31

If the air outlet cannot be switched, the mode selection damper control motor circuit may be failed.

1. Malfunction of the mode selection damper control motor
2. Malfunction of the heater control unit
3. Damaged wiring harness or connectors

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe
3. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: V.C.I. MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, check for diagnostic trouble code. Check if an heater control unit DTC is set. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__diagnostic-trouble-code-chart) . NO: Go to Step 2.
2. STEP 2. Check mode selection damper control motor connector C-111 and heater control unit connector C-47 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are mode selection damper control motor connector C-111 and heater control unit connector C-47 in good condition? YES: Go to Step 3. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Check that the A/C works normally.
3. STEP 3. Check the wiring harness between heater control unit connector C-47 (terminals 29, 31, 32, 30 and 33) and mode selection damper control motor connector C-111 (terminals 3, 2, 5, 4 and 1). Check the heater control unit signal line for open and short circuit. Q: Are the wiring harness between heater control unit connector C-47 (terminals 29, 31, 32, 30 and 33) and mode selection damper control motor connector C-111 (terminals 3, 2, 5, 4 and 1) in good condition? YES: Go to Step 4. NO: Repair the wiring harness. Check that the A/C works normally.
4. STEP 4. Replace the mode selection damper control motor and check the trouble symptom again Check the trouble symptom again. Q: Is the check result satisfactory? YES: The procedure is complete. NO: Replace the heater control unit.

If the voltage is not supplied to the blower motor, the blower relay system may be failed.

1. Malfunction of the ETACS-ECU
2. Malfunction of the blower relay
3. Damaged wiring harness or connectors

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

Scheme 32

Scheme 33

Scheme 34

1. STEP 1. Check blower relay connector C-303 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is blower relay connector C-303 in good condition? YES: Go to Step 2. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
2. STEP 2. Check the blower relay continuity. Follow the table below to check the blower relay for continuity. BLOWER RELAY CONTINUITY CHECK Battery voltage Tester connection Specified condition Not applied 3 - 4 Open circuit Connect terminal 1 to the positive battery terminal Connect terminal 2 to the negative battery terminal 3 - 4 Less than 2 ohms Q: Is the blower relay in good condition? YES: Go to Step 3. NO: Replace the rear window defogger relay.
3. STEP 3. Measure the voltage at blower relay connector C-303. Disconnect blower relay connector C-303, and measure the voltage at the junction block side. Measure the voltage between terminals 1 and ground. The measured value should be approximately 12 volts (battery positive voltage). Measure the voltage between terminals 4 and ground. The measured value should be approximately 12 volts (battery positive voltage). Q: Is the measured voltage approximately 12 volts? YES: Go to Step 5 . NO: Go to Step 4.
4. STEP 4. Check the wiring harness between blower relay connector C-303 (terminals 1 and 4) and the fusible link (37). NOTE: Also check ETACS-ECU connector C-309 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If ETACS-ECU connector C-309 is damaged, repair or replace the connector as described in «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Check the blower relay power supply line for open circuit. Q: Is the wiring harness between blower relay connector C-303 (terminals 1 and 4) and the fusible link (37) in good condition? YES: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) . NO: Repair or replace the wiring harness. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
5. STEP 5. Check blower relay connector C-113 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is blower relay connector C-113 in good condition? YES: Go to Step 6. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
6. STEP 6. Check the wiring harness between blower relay connector C-303 (terminal 3) and blower motor connector C-113 (terminal 1). NOTE: Also check ETACS-ECU connector C-315 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If ETACS-ECU connector C-315 is damaged, repair or replace the connector as described in «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Check the blower motor power supply line for open circuit. Q: Is the wiring harness between blower relay connector C-303 (terminal 3) and blower motor connector C-113 (terminal 1) in good condition? YES: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) . NO: Repair or replace the wiring harness. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .

SYMPTOM CHART < Vehicles with A/C >

SYMPTOM CHART (VEHICLES WITH A/C)

The blower system or the compressor system may be defective if there is no cool air coming from the vents.

1. Malfunction of blower motor
2. Malfunction of A/C-ECU
3. Malfunction of A/C compressor

1. STEP 1. Using scan tool MB991958, read the diagnostic trouble code. CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Check if an A/C-ECU DTC is set. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__diagnostic-trouble-code-chart) . NO: Go to Step 2.
2. STEP 2. Check that the blower motor operation when the blower knob is moved to the "Maximum air volume" position. Turn the ignition switch to the "ON" position. Turn the blower knob to the "Maximum air volume" position Q: Does the blower motor operate when the blower knob is moved to the "Maximum air volume" position? YES: Go to Step 3. NO: Refer to «INSPECTION PROCEDURE 4 "BLOWER FAN AND MOTOR DO NOT TURN»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution) ."
3. STEP 3. Check the rear window defogger and outside/inside air selection damper control motor operation. Turn the ignition switch to the "ON" position. Check the engine running. Check the operations of rear window defogger and outside/inside air selection damper control motor. Q: Do the rear window defogger and outside/inside air selection damper control motor work normally? YES: Refer to «INSPECTION PROCEDURE 3 "THE A/C COMPRESSOR DOES NOT WORK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution) ." NO: Refer to «INSPECTION PROCEDURE 2, "MALFUNCTION OF THE A/C-ECU POWER SUPPLY SYSTEM»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution) ."

Scheme 35

The A/C-ECU power system may be defective if the air conditioning, defogger, and outside/inside air selection damper motor all do not operate normally.

1. Malfunction of the A/C-ECU
2. Damaged wiring harness or connectors

Required Special Tool

1. MB991223: Test Harness Set

Scheme 36

Scheme 37

Scheme 38

1. STEP 1. Check A/C-ECU connector C-20 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is A/C-ECU connector C-20 in good condition? YES: Go to Step 2. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Check that the A/C works normally.
2. STEP 2. Measure the voltage at A/C-ECU connector C-20. Disconnect A/C-ECU connector C-20 and measure the voltage at the harness side. Turn the ignition switch to the "ON" position. Measure the voltage between terminal 15 and ground. The measured value should be approximately 12 volts (battery positive voltage). Q: Is the measured voltage approximately 12 volts? YES: Go to Step 5 . NO: Go to Step 3.
3. STEP 3. Check ETACS-ECU connector C-317 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is ETACS-ECU connector C-317 in good condition? YES: Go to Step 4. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Check that the A/C works normally.
4. STEP 4. Check the wiring harness between A/C-ECU connector C-20 (terminal 15) and ETACS-ECU connector C-317 (terminal 5). Check the A/C-ECU power supply line for open circuit. NOTE: Also check joint connector C-03 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-03 is damaged, repair or replace the connector as described in «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Q: Is the wiring harness between A/C-ECU connector C-20 (terminal 15) and ETACS-ECU connector C-317 (terminal 5) in good condition? YES: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) . NO: Repair the wiring harness. Check that the A/C works normally.
5. STEP 5. Measure the voltage at A/C-ECU connector C-20. Disconnect A/C-ECU connector C-20 and measure the voltage at the harness side. Measure the voltage between terminal 13 and ground. The measured value should be approximately 12 volts (battery positive voltage). Q: Is the measured voltage approximately 12 V? YES: Go to Step 7 . NO: Go to Step 6.
6. STEP 6. Check the wiring harness between A/C-ECU connector C-20 (terminal 13) and the fusible link (36). NOTE: Also check ETACS-ECU connectors C-307 and C-317 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If ETACS-ECU connectors C-307 and C-317 is damaged, repair or replace the connector as described in «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Check the A/C-ECU power supply line for open circuit. Q: Is the wiring harness between A/C-ECU connector C-20 (terminal 13) and the fusible link (36) in good condition? YES: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) . NO: Repair the wiring harness. Check that the A/C works normally.
7. STEP 7. Measure the resistance at A/C-ECU connector C-20. Disconnect A/C-ECU connector C-20, and measure at the wiring harness side. Measure the resistance between terminal 14 and ground. The measured value should be 2 ohms or less. Q: Does the measured resistance value correspond with this range? YES: Replace the A/C-ECU, and check that the A/C works normally. NO: Go to Step 8.
8. STEP 8. Check the wiring harness between A/C-ECU connector C-20 (terminal 14) and the ground. Check the A/C-ECU ground line for open circuit. Q: Is the wiring harness between A/C-ECU connector C-20 (terminal 14) and ground in good condition? YES: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) . NO: Repair the wiring harness. Check that the A/C works normally.

Scheme 39

FUNCTION

Compressor that recovers the refrigerant, which evaporated in the evaporator and became a high-temperature and high-pressure gas, and turns it into liquid again.

PROBABLE CAUSES

1. Insufficient refrigerant
2. Malfunction of connector.
3. Malfunction of the harness (A/C compressor circuit is open/shorted to ground)
4. Malfunction of the A/C pressure sensor.
5. Malfunction of the A/C compressor.
6. Malfunction of the A/C compressor clutch relay.
7. Malfunction of the A/C-ECU.

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe
3. MB991658: Test Harness Set
4. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: V.C.I. MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

Scheme 40

Scheme 41

Scheme 42

Scheme 43

Scheme 44

Scheme 45

Scheme 46

1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line. CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Diagnose the CAN bus line. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the CAN bus line found to be normal? YES: Go to Step 2. NO: Repair the CAN bus lines (Refer to «DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/communication-devices/#controller-area-network-can-except-lancer-evolution__diagnosis) ).
2. STEP 2. Using scan tool MB991958, read the diagnostic trouble code. Check if an A/C-ECU DTC is set. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__diagnostic-trouble-code-chart) . NO: Go to Step 3.
3. STEP 3. Check A/C compressor assembly connector B-14 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is A/C compressor assembly connector B-14 in good condition? YES: Go to Step 4. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
4. STEP 4. Check the A/C compressor clutch operation. Connect the compressor connector terminal to the battery positive (+) terminal and ground the battery's negative (-) terminal to the compressor unit. At that time, the A/C compressor clutch should make a definite operating sound. Q: Can the sound (click) of the A/C compressor clutch operation be heard? YES: Go to Step 5. NO: Replace the compressor magnet clutch.
5. STEP 5. Check A/C compressor clutch relay connector A-13X for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is A/C compressor clutch relay connector A-13X in good condition? YES: Go to Step 6. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
6. STEP 6. Check the A/C compressor clutch relay continuity. Follow the table below to check the A/C compressor clutch relay for continuity. A/C COMPRESSOR CLUTCH RELAY CONTINUITY CHART BATTERY VOLTAGE TESTER CONNECTION SPECIFIED CONDITION Not applied 3 - 4 Open circuit Connect terminal 2 to the positive battery terminal Connect terminal 1 to the negative battery terminal 3 - 4 Less than 2 ohms Q: Is the A/C compressor clutch relay in good condition? YES: Go to Step 7. NO: Replace the A/C compressor clutch relay.
7. STEP 7. Check engine control module connector B-109 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is engine control module connector B-109 in good condition? YES: Go to Step 8. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
8. STEP 8. Measure the voltage at A/C compressor assembly connector B-14. Disconnect A/C compressor assembly connector B-14 and measure the voltage at the wiring harness side. Disconnect powertrain control module connector B-109 and ground harness side terminal No. 102. Turn the ignition switch to the "ON" position. A/C compressor assembly connector B-14 terminal 1 and ground. The measured value should be approximately 12 volts (battery positive voltage). Q: Is the measured voltage approximately 12 volts? YES: Go to Step 13 . NO: Go to Step 9.
9. STEP 9. Measure the voltage at A/C compressor clutch relay connector A-13X. Disconnect A/C compressor connector A-13X and measure the voltage at the relay box side. Turn the ignition switch to the "ON" position. Measure the voltage between terminal 4 and ground. The measured value should be approximately 12 volts (battery positive voltage). Measure the voltage between terminal 2 and ground. The measured value should be approximately 12 volts (battery positive voltage). Q: Is the measured voltage approximately 12 volts? YES: Go to Step 11 . NO: Go to Step 10.
10. STEP 10. Check the wiring harness between A/C compressor clutch relay connector A-13X (terminals 2 and 4) and the fusible link (36). Check the A/C compressor clutch relay power supply line for open circuit. Q: Is the wiring harness between A/C compressor clutch relay connector A-13X (terminals 2 and 4) and the fusible link (36) in good condition? YES: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) . NO: Repair the wiring harness. Check that the A/C works normally.
11. STEP 11. Check the wiring harness between A/C compressor clutch relay connector A-13X (terminal 3) and A/C compressor assembly connector B-14 (terminal 1). NOTE: Also check intermediate connector A-10 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector A-10 is damaged, repair or replace the connector as described in «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Check the A/C compressor assembly power supply line for open circuit. Q: Is the wiring harness between A/C compressor clutch relay connector A-13X (terminal 3) and A/C compressor assembly connector B-14 (terminal 1) in good condition? YES: Go to Step 12. NO: Repair the wiring harness. Check that the A/C works normally.
12. STEP 12. Check the wiring harness between powertrain control module connector B-109 (terminal 102) and A/C compressor clutch relay connector A-13X (terminal 1). Check the powertrain control module signal line for open and short circuit. Q: Is the wiring harness between powertrain control module connector B-109 (terminal 102) and A/C compressor clutch relay connector A-13X (terminal 1) in good condition? YES: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) . NO: Repair the wiring harness. Check that the A/C works normally.
13. STEP 13. Check the refrigerant temperature switch. CAUTION: Do not heat more than necessary. Dip the metal part of the cooling temperature switch into engine oil and increase the oil temperature using a gas burner or similar. When the oil temperature reaches the standard value, check that resistance is supplied between the terminals. Standard value OIL TEMPERATURE SPECIFICATIONS ITEM TEMPERATURE Less than 2 ohms Slightly below 120°C (248°F) No continuity 135°C (275°F) or more NOTE: When the oil temperature is 135°C (275°F) or more and there is no continuity, the resistance will not be 2ohms or lower until the oil temperature reduces to 120°C (248°F) or less. Q: Is the refrigerant temperature switch operating properly? YES: Go to Step 14. NO: Replace the refrigerant temperature switch. Check that the A/C works normally.
14. STEP 14. Replace the A/C-ECU. Q: Does the A/C operate normally? YES: No action is necessary and testing is complete. NO: Replace the powertrain control module. Check that the A/C works normally.

Scheme 47

If the blower motor does not operate, the blower relay system is suspected.

1. Malfunction of the power transistor
2. Malfunction of the blower motor
3. Malfunction of the A/C-ECU
4. Damaged wiring harness or connectors

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

Scheme 48

1. STEP 1. Check blower motor connector C-113 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is blower motor connector C-113 in good condition? YES: Go to Step 2. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . The blower motor should operate normally.
2. STEP 2. Measure the voltage at blower motor connector C-113. Disconnect blower motor connector C-113, and measure the voltage at the wiring harness side. Turn the ignition switch to the "ON" position. Turn the blower switch to the "Maximum air volume" position. Measure the voltage between terminal 1 and ground. The measured value should be approximately 12 volts (battery positive voltage). Q: Is the measured voltage approximately 12 volts? YES: Go to Step 3. NO: Refer to «INSPECTION PROCEDURE 10, "BLOWER MOTOR POWER SUPPLY SYSTEM»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution) ."
3. STEP 3. Check blower motor connector C-113 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is blower motor connector C-113 in good condition? YES: Go to Step 4. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . The blower motor should operate normally.
4. STEP 4. Check the blower fan and motor operation. Check that the motor turns when applying battery power between the connector terminals. Also check to see that there is no abnormal sound emitted from the motor at this time. Q: Is there any abnormal noise? YES: Go to Step 5. NO: Replace the blower relay. The blower motor should operate normally.
5. STEP 5. Check A/C-ECU connector C-20 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is A/C-ECU connector C-20 in good condition? YES: Go to Step 6. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . The blower motor should operate normally.
6. STEP 6. Check the wiring harness between A/C-ECU connector C-20 (terminal 1) and blower motor connector C-113 (terminal 2). Check the AC-ECU signal line for open and short circuit. Q: Is the wiring harness between A/C-ECU connector C-20 (terminal 1) and blower motor connector C-113 (terminal 2) in good condition? YES: Go to Step 7. NO: Repair the wiring harness. The blower motor should operate normally.
7. STEP 7. Check power transistor connector C-112 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is power transistor connector C-112 in good condition? YES: Go to Step 8. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . The blower motor should operate normally.
8. STEP 8. Measure the resistance at power transistor connector C-112. Disconnect power transistor connector C-112, and measure the resistance at the wiring harness side. Measure the resistance value between terminal 1 and ground. OK: The measured value should be 2 ohms or less Q: Does the measured resistance value correspond with this range? YES: Go to Step 10 . NO: Go to Step 9.
9. STEP 9. Check the wiring harness between power transistor connector C-112 (terminal 1) and ground. Check the power transistor ground line for open circuit. Q: Is the wiring harness between power transistor connector C-112 (terminal 1) and ground in good condition? YES: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) . NO: Repair the wiring harness. The blower motor should operate normally.
10. STEP 10. Check the wiring harness between A/C-ECU connector C-20 (terminals 1 and 2) and power transistor connector C-112 (terminals 2 and 4). Check the AC-ECU signal line for open and short circuit. Q: Is the wiring harness between A/C-ECU connector C-20 (terminals 1 and 2) and power transistor connector C-112 (terminals 2 and 4) in good condition? YES: Go to Step 11. NO: Repair the wiring harness. The blower motor should operate normally.
11. STEP 11. Replace the power transistor and check the trouble symptom again Check the trouble symptom again. Q: Is the check result satisfactory? YES: The procedure is complete. NO: Replace the A/C-ECU.

If the blower motor speed cannot be changed, the power transistor circuit is suspected.

1. Malfunction of the power transistor
2. Malfunction of the A/C-ECU
3. Damaged wiring harness or connectors

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

1. STEP 1. Check power transistor connector C-112 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is power transistor connector C-112 in good condition? YES: Go to Step 2. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . The blower motor should operate normally.
2. STEP 2. Measure the resistance at power transistor connector C-112. Disconnect power transistor connector C-112, and measure the resistance at the wiring harness side. Measure the resistance value between terminal 1 and ground. OK: The measured value should be 2 ohms or less Q: Does the measured resistance value correspond with this range? YES: Go to Step 4 . NO: Go to Step 3.
3. STEP 3. Check the wiring harness between power transistor connector C-112 (terminal 1) and ground. Check the power transistor ground line for open circuit. Q: Is the wiring harness between power transistor connector C-112 (terminal 1) and ground in good condition? YES: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) . NO: Repair the wiring harness. The blower motor should operate normally.
4. STEP 4. Check A/C-ECU connector C-20 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is A/C-ECU connector C-20 in good condition? YES: Go to Step 5. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . The blower motor should operate normally.
5. STEP 5. Check the wiring harness between A/C-ECU connector C-20 (terminals 1 and 2) and power transistor connector C-112 (terminals 2 and 4). Check the AC-ECU signal line for open and short circuit. Q: Is the wiring harness between A/C-ECU connector C-20 (terminals 1 and 2) and power transistor connector C-112 (terminals 2 and 4) in good condition? YES: Go to Step 6. NO: Repair the wiring harness. The blower motor should operate normally.
6. STEP 6. Replace the power transistor and check the trouble symptom again Check the trouble symptom again. Q: Is the check result satisfactory? YES: The procedure is complete. NO: Replace the A/C-ECU.

Scheme 49

If the outside/inside air selection damper control motor does not operate normally, the outside/inside air selection damper control motor system may be defective.

1. Malfunction of the outside/inside air selection damper control motor
2. Malfunction of the A/C-ECU
3. Damaged wiring harness or connectors

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe
3. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: V.C.I. MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, check for diagnostic trouble code. CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Check if an A/C-ECU DTC is set. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__how-to-connect-the-scan-tool) ." Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__diagnostic-trouble-code-chart) . NO: Go to Step 2.
2. STEP 2. Check outside/inside air selection damper control motor connector C-109 and A/C-ECU connector C-19 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are outside/inside air selection damper control motor connector C-109 and A/C-ECU connector C-19 in good condition? YES: Go to Step 3. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Check that the A/C works normally.
3. STEP 3. Check the wiring harness between A/C-ECU connector C-19 (terminals 26, 25, 27, 24 and 29) and outside/inside air selection damper control motor connector C-109 (terminals 2, 5, 4, 1 and 3). Check the A/C-ECU signal line for open and short circuit. Q: Are the wiring harness between A/C-ECU connector C-19 (terminals 26, 25, 27, 24 and 29) and outside/inside air selection damper control motor connector C-109 (terminals 2, 5, 4, 1 and 3) in good condition? YES: Go to Step 4. NO: Repair the wiring harness. Check that the A/C works normally.
4. STEP 4. Replace the outside/inside air selection damper control motor and check the trouble symptom again Check the trouble symptom again. Q: Is the check result satisfactory? YES: The procedure is complete. NO: Replace the A/C-ECU.

Scheme 50

If the air outlet temperature cannot be adjusted, the air mixing damper control motor circuit may be failed.

1. Malfunction of the air mixing damper control motor
2. Malfunction of the A/C-ECU
3. Damaged wiring harness or connectors

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe
3. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: V.C.I. MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, check for diagnostic trouble code. Check if an A/C-ECU DTC is set. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__diagnostic-trouble-code-chart) . NO: Go to Step 2.
2. STEP 2. Check air mixing damper control motor connector C-118 and A/C-ECU connector C-19 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are air mixing damper control motor connector C-118 and A/C-ECU connector C-19 in good condition? YES: Go to Step 3. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Check that the A/C works normally.
3. STEP 3. Check the wiring harness between A/C-ECU connector C-19 (terminals 29, 35, 36, 34 and 28) and air mixing damper control motor connector C-118 (terminals 3, 2, 5, 4 and 1). Check the A/C-ECU signal line for open and short circuit. Q: Are the wiring harness between A/C-ECU connector C-19 (terminals 29, 35, 36, 34 and 28) and air mixing damper control motor connector C-118 (terminals 3, 2, 5, 4 and 1) in good condition? YES: Go to Step 4. NO: Repair the wiring harness. Check that the A/C works normally.
4. STEP 4. Replace the air mixing damper control motor and check the trouble symptom again Check the trouble symptom again. Q: Is the check result satisfactory? YES: The procedure is complete. NO: Replace the A/C-ECU.

Scheme 51

If the air outlet cannot be switched, the mode selection damper control motor circuit may be failed.

1. Malfunction of the mode selection damper control motor
2. Malfunction of the A/C-ECU
3. Damaged wiring harness or connectors

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe
3. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: V.C.I. MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, check for diagnostic trouble code. Check if an A/C-ECU DTC is set. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Check if the DTC is set. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the DTC set? YES: Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__diagnostic-trouble-code-chart) . NO: Go to Step 2.
2. STEP 2. Check mode selection damper control motor connector C-111 and A/C-ECU connector C-19 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are mode selection damper control motor connector C-111 and A/C-ECU connector C-19 in good condition? YES: Go to Step 3. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Check that the A/C works normally.
3. STEP 3. Check the wiring harness between A/C-ECU connector C-19 (terminals 29, 31, 32, 30 and 33) and mode selection damper control motor connector C-111 (terminals 3, 2, 5, 4 and 1). Check the A/C-ECU signal line for open and short circuit. Q: Are the wiring harness between A/C-ECU connector C-19 (terminals 29, 31, 32, 30 and 33) and mode selection damper control motor connector C-111 (terminals 3, 2, 5, 4 and 1) in good condition? YES: Go to Step 4. NO: Repair the wiring harness. Check that the A/C works normally.
4. STEP 4. Replace the mode selection damper control motor and check the trouble symptom again Check the trouble symptom again. Q: Is the check result satisfactory? YES: The procedure is complete. NO: Replace the A/C-ECU.

If the voltage is not supplied to the blower motor, the blower relay system may be failed.

1. Malfunction of the ETACS-ECU
2. Malfunction of the blower relay
3. Damaged wiring harness or connectors

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

1. STEP 1. Check blower relay connector C-303 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is blower relay connector C-303 in good condition? YES: Go to Step 2. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
2. STEP 2. Check the blower relay continuity. Follow the table below to check the blower relay for continuity. BLOWER RELAY CONTINUITY CHECK Battery voltage Tester connection Specified condition Not applied 3 - 4 Open circuit Connect terminal 1 to the positive battery terminal Connect terminal 2 to the negative battery terminal 3 - 4 Less than 2 ohms Q: Is the blower relay in good condition? YES: Go to Step 3. NO: Replace the rear window defogger relay.
3. STEP 3. Measure the voltage at blower relay connector C-303. Disconnect blower relay connector C-303, and measure the voltage at the junction block side. Measure the voltage between terminals 1 and ground. The measured value should be approximately 12 volts (battery positive voltage). Measure the voltage between terminals 4 and ground. The measured value should be approximately 12 volts (battery positive voltage). Q: Is the measured voltage approximately 12 volts? YES: Go to Step 5 . NO: Go to Step 4.
4. STEP 4. Check the wiring harness between blower relay connector C-303 (terminals 1 and 4) and the fusible link (37). NOTE: Also check ETACS-ECU connector C-309 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If ETACS-ECU connector C-309 is damaged, repair or replace the connector as described in «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Check the blower relay power supply line for open circuit. Q: Is the wiring harness between blower relay connector C-303 (terminals 1 and 4) and the fusible link (37) in good condition? YES: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) . NO: Repair or replace the wiring harness. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
5. STEP 5. Check blower relay connector C-113 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Is blower relay connector C-113 in good condition? YES: Go to Step 6. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .
6. STEP 6. Check the wiring harness between blower relay connector C-303 (terminal 3) and blower motor connector C-113 (terminal 1). NOTE: Also check ETACS-ECU connector C-315 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If ETACS-ECU connector C-315 is damaged, repair or replace the connector as described in «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) . Check the blower motor power supply line for open circuit. Q: Is the wiring harness between blower relay connector C-303 (terminal 3) and blower motor connector C-113 (terminal 1) in good condition? YES: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/hoistjack/#general-information-except-lancer-evolution__how-to-cope-with-intermittent-malfunctions) . NO: Repair or replace the wiring harness. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/x-2007-2016/remont/body-electrical/#general-electrical-except-lancer-evolution) .

DATA LIST REFERENCE TABLE

Refer to DATA LIST REFERENCE TABLE .)

ACTUATOR TEST REFERENCE

Refer to ACTUATOR TEST .)

Scheme 52

HEATER CONTROL UNIT CONNECTOR TERMINALS VOLTAGE SPECIFIED CONDITIONS

SPECIAL TOOLS

SPECIAL TOOLS Tool Tool number and name Supersession Application MB990810 Side bearing puller MB991367-01 A/C compressor rotor removal and installation MB992623 Guide MIT217213 MB992624 Pusher MB990900-01 MD999566 Claw MB991367-01 MB991367 Special spanner MB991367-01 Armature mounting nut of compressor removal and installation MB991386 Pin MIT217213 Armature mounting nut of compressor removal and installation MB991658 Test harness set Tool not available Inspection of throttle position sensor MB991223 MB991219 MB991220 MB991221 MB991222 Harness set Check harness LED harness LED harness adapter Probe Continuity check and voltage measurement at harness wire or connector For checking connector pin contact pressure For checking power supply circuit For checking power supply circuit For connecting a locally sourced tester MB992006 Extra fine probe General service tool Making voltage and resistance measurement during troubleshooting MB991958 MB991824 MB991827 MB991910 MB991911 MB991914 MB991825 MB991826 M.U.T.-III sub-assembly Vehicle communication interface (V.C.I.) M.U.T.-III USB cable M.U.T.-III main harness A (Vehicles with CAN communication system) M.U.T.-III main harness B (Vehicles without CAN communication system) M.U.T.-III main harness C (for Chrysler only) M.U.T.-III measurement adapter M.U.T.-III trigger harness MB991824-KIT NOTE: G: MB991826 M.U.T.-III Trigger Harness is not necessary when pushing V.C.I. ENTER key. CAUTION: M.U.T.-III main harness A (MB991910) should be used. M.U.T.-III main harness B and C should not be used for this vehicle. DTC, data list and actuator test check

Scheme 53

Scheme 54

Scheme 55

Scheme 56

Scheme 57

Scheme 58

Scheme 59

Scheme 60

Scheme 61

REFRIGERANT LEVEL TEST

Use the refrigerant recovery station to remove all of the refrigerant, and then calculate the amount of the refrigerant and charge it.

A/C COMPRESSOR CLUTCH TEST

1. Disconnect the A/C compressor clutch connector to the A/C compressor clutch.
2. Connect positive battery voltage directly to the connector for the A/C compressor clutch.
3. Supply a ground to the A/C compressor assembly.
4. If the A/C compressor clutch is normal, there will be a "click." If the pulley and armature do not make contact ("no click"), there is a malfunction.

SIMPLE INSPECTION OF THE A/C PRESSURE SENSOR

1. Assemble a gauge manifold on the high pressure service valve.
2. Disconnect the A/C pressure sensor connector and connect special tool test harness MB991658 as shown in the illustration.
3. Turn ON the engine and then turn ON the air conditioner switch.
4. At this time, check to see that the voltage of A/C pressure sensor terminal No. 2 reflects the specifications of the figure. NOTE: The allowance shall be defined as ±5%.

COMPRESSOR DRIVE BELT ADJUSTMENT

Refer to DRIVE BELT TENSION CHECK . < 2.0L ENGINE Non-turbo >

Refer to DRIVE BELT TENSION CHECK . < 2.0L ENGINE Turbo >

Refer to DRIVE BELT TENSION CHECK . < 2.4L ENGINE >

CHARGING

Use the refrigerant recovery station to charge the refrigerant.

METHOD BY USING REFRIGERANT RECOVERY AND RECYCLING UNIT

Using the refrigerant recovery and recycling unit, refill the refrigerant.

Note. Refer to the Refrigerant Recovery and Recycling Unit's Instruction Manual for operation of the unit.

DISCHARGING SYSTEM

Use the refrigerant recovery unit to discharge refrigerant gas from the system.

Note. Refer to the Refrigerant Recovery and Recycling Unit's Instruction Manual for operation of the unit.

REFILLING OF OIL IN THE A/C SYSTEM

Too little oil will provide inadequate compressor lubrication and cause a compressor failure. Too much oil will increase discharge air temperature.

When a compressor is installed at the factory, it contains 70 cm 3 (2.4 fl. oz.) of refrigerant oil. While the A/C system is in operation, the oil is carried through the entire system by the refrigerant. Some of this oil will be trapped and retained in various parts of the system.

When the following system components are changed, it is necessary to add oil to the system to replace the oil being removed with the component.

Compressor oil: SUN PAG 56

Quantity

Evaporator: 25 cm 3 (0.8 fl. oz.)

Condenser: 15 cm 3 (0.5 fl. oz.)

Suction hose: 10 cm 3 (0.3 fl. oz.)

PERFORMANCE TEST

The vehicles to be tested should be parked out of direct sunlight.

Scheme 62

Scheme 63

1. Close the high and low-pressure valve of the gauge manifold.
2. Connect the charging hose (blue) to the low-pressure valve and connect the charging hose (red) to the high-pressure valve of the gauge manifold.
3. Install the quick joint (for low-pressure) to the charging hose (blue), and connect the quick joint (for high-pressure) to the charging hose (red). CAUTION: To connect the quick joint, press section A firmly against the service valve until a click is heard. When connecting, run your hand along the hose while pressing to ensure that there are no bends in the hose.
4. Connect the quick joint (for low-pressure) to the low-pressure service valve and connect the quick joint (for high-pressure) to the high-pressure service valve. NOTE: The high-pressure service valve is on the A/C pipe and the low-pressure service valve is on the suction hose.
5. Start the engine.
6. Set the A/C controls as follows: A/C switch: A/C - ON position Mode selection: FACE position Temperature control: MAXIMUM COOLING position Air selection: RECIRCULATION position Blower switch: Maximum air volume
7. Set the engine speed to the idle speed.
8. Engine should be warmed up with hood, doors and windows opened.
9. Insert a thermometer in the center air outlet and operate the engine for 20 minutes. NOTE: If the A/C clutch cycles, take the reading before the clutch disengages.
10. Note the discharge air temperature.

PERFORMANCE TEMPERATURE CHART

PERFORMANCE TEMPERATURE CHART

LOST CHARGE

If the system has lost all charge due to a leak

1. Evacuate the system. (Refer to «CHARGING»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__charging) ).
2. Charge the system with approximately 0.453 kg (1 pound) of refrigerant.
3. Check for leaks.
4. Discharge the system.
5. Repair leaks. CAUTION: Replacement filter-drier units must be sealed while in storage. The drier used in these units will saturate water quickly upon exposure to the atmosphere. When installing a drier, have all tools and supplies ready for quick assembly to avoid keeping the system open any longer than necessary.
6. Replace receiver drier.
7. Evacuate and charge system.

LOW CHARGE

If the system has not lost all of its refrigerant charge; locate and repair all leaks. If it is necessary to increase the system pressure to find the leak (because of an especially low charge) add refrigerant. If it is possible to repair the leak without discharging the refrigerant system, use the procedure for correcting low refrigerant level.

HANDLING TUBING AND FITTINGS

Kinks in the refrigerant tubing or sharp bends in the refrigerant hose lines will greatly reduce the capacity of the entire system. High pressures are produced in the system when it is operating. Extreme care must be exercised to make sure that all connections are pressure tight. Dirt and moisture can enter the system when it is opened for repair or replacement of lines or components. The following precautions must be observed. The system must be completely discharged before opening any fitting of connection in the refrigeration system. Open fittings with caution even after the system has been discharged. If any pressure is noticed as a fitting is loosened, allow trapped pressure to bleed off very slowly.

Never attempt to rebend formed lines to fit. Use the correct line for the installation you are servicing. A good rule for the flexible hose lines is keep the radius of all bends at least 10 times the diameter of the hose.

Sharper bends will reduce the flow of refrigerant. The flexible hose lines should be routed so that they are at least 80 mm (3.1 inches) from the exhaust manifold. It is good practice to inspect all flexible hose lines at least once a year to make sure they are in good condition and properly routed.

On standard plumbing fittings with O-rings, these O-rings are not reusable.

COMPRESSOR NOISE CHECK

You must first know the conditions when the noise occurs. These conditions are: weather, vehicle speed, in gear or neutral, engine temperature or any other special conditions.

Noises that develop during A/C operation can often be misleading. For example: what sounds like a failed front bearing or connecting rod, may be caused by loose bolts, nuts, mounting brackets, or a loose clutch assembly. Verify accessory drive belt tension (power steering or generator).

Improper accessory drive belt tension can cause a misleading noise when the compressor is engaged and little or no noise when the compressor is disengaged.

Drive belts are speed-sensitive. That is, at different engine speeds, and depending upon belt tension, belts can develop unusual noises that are often mistaken for mechanical problems within the compressor.

ADJUSTMENT

1. Select a quiet area for testing. Duplicate conditions as much as possible. Switch the compressor on and off several times to clearly identify compressor noise. To duplicate high ambient conditions (high head pressure), restrict air flow through the condenser. Install a manifold gauge set to make sure discharge pressure doesn't exceed 2,070 kPa (300.2 psi).
2. Tighten all compressor mounting bolts, clutch mounting bolt, and compressor drive belt. Check to assure clutch coil is tight (no rotation or wobble).
3. Check refrigerant hoses for rubbing or interference that can cause unusual noises.
4. Check refrigerant charge (Refer to «CHARGING»(/mitsubishi/lancer-evolution/x-2007-2016/remont/automatic-hvac-system/#heating-air-conditioning-and-ventilation-except-lancer-evolution__charging) ).
5. Recheck compressor noise as in Step 1 .
6. If noise still exists, loosen compressor mounting bolts and retighten. Repeat Step 1 .
7. If noise continues, replace compressor and repeat from Step 1 .

A/C COMPRESSOR CLUTCH RELAY CONTINUITY CHECK

A/C COMPRESSOR CLUTCH RELAY CONTINUITY CHECK

BLOWER RELAY CONTINUITY CHECK

BLOWER RELAY CONTINUITY CHECK

IDLE-UP OPERATION CHECK

Before inspection and adjustment, set vehicle in the following condition

1. Engine coolant temperature: 80 - 90°C (176.0 - 194.0°F)
2. Lights, electric cooling fan and accessories: OFF
3. Transmission: Neutral ("N" or "P" position)
4. Steering wheel: Straightforward

1. Check whether or not the idle speed is the standard value. Refer to «CURB IDLE SPEED CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical/#engine-mechanical-20l-non-turbo-except-lancer-evolution__curb-idle-speed-check) < 2.0L ENGINE Non-turbo > Refer to «CURB IDLE SPEED CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical/#engine-mechanical-20l-turbo-except-lancer-evolution__curb-idle-speed-check) . < 2.0L ENGINE Turbo > Refer to «CURB IDLE SPEED CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical/#engine-mechanical-24l-except-lancer-evolution__curb-idle-speed-check) . < 2.4L ENGINE > Standard value: 700 ± 100 r/min < Except 2.4L ENGINE > Standard value: 650 ± 100 r/min < 2.4L ENGINE >
2. Turn on the air conditioning switch and the blower speed selection dial. Engine idling speed should be within the standard value: Standard value: 750 ± 50 r/min < 2.0L ENGINE Non-turbo > Standard value: 800 ± 50 r/min < 2.0L ENGINE Turbo > Standard value: 800 ± 50 r/min < 2.4L ENGINE > NOTE: It is not necessary to make an adjustment, because the idling speed is automatically adjusted by the ISC system. If, however, a deviation from the standard value occurs for some reason, check the ISC system (Refer to «CURB IDLE SPEED CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical/#engine-mechanical-20l-non-turbo-except-lancer-evolution__curb-idle-speed-check) < 2.0L ENGINE Non-turbo > or «CURB IDLE SPEED CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical/#engine-mechanical-20l-turbo-except-lancer-evolution__curb-idle-speed-check) < 2.0L ENGINE Turbo > or «CURB IDLE SPEED CHECK»(/mitsubishi/lancer-evolution/x-2007-2016/remont/mechanical/#engine-mechanical-24l-except-lancer-evolution__curb-idle-speed-check) < 2.4L ENGINE >)

Scheme 64

1. Remove the glove box (Refer to «GLOVE BOX»(/mitsubishi/lancer-evolution/x-2007-2016/remont/gauges-instrument-panels/#interior-except-lancer-evolution) ).
2. Loosen the two lugs as shown in the figure to replace the clean air filter.
3. Install the glove box.

Scheme 65

REMOVAL AND INSTALLATION

Scheme 66

<< A >> SUCTION PIPE AND LIQUID PIPE DISCONNECTION

To prevent the entry of dust or other foreign bodies, plug the dismantled hose and the nipples of the expansion valves.

<< B >> FRONT DECK CROSSMEMBER ASSEMBLY REMOVAL

Disconnect the following connectors to gain access to the front deck crossmember.

FRONT DECK CROSSMEMBER CONNECTORS REFERENCE CHART

Scheme 67

Scheme 68

Scheme 69

AIR THERMO SENSOR CHECK

Measure the resistance between the sensor terminals under at least two temperatures. The resistance values should meet the values shown in the figure.

Note. The temperature should be within the range shown in the figure.

Scheme 70

<< A >> AIR MIXING DAMPER CONTROL MOTOR, OUTSIDE/INSIDE AIR SELECTION DAMPER CONTROL MOTOR, MODE SELECTION DAMPER CONTROL MOTOR REMOVAL

Note. A normal plate-type ratchet driver is recommended.

Scheme 71

>> A << OUTSIDE/INSIDE AIR SELECTION DAMPER CONTROL MOTOR INSTALLATION

Install the outside/inside air selection damper control motor while pressing the outside/inside air selection damper from the hole of the blower motor.

BLOWER MOTOR CHECK

Check that the motor turns when applying battery power between the connector terminals. Also check to see that there is no abnormal sound emitted from the motor at this time.

Scheme 72

AMBIENT AIR TEMPERATURE SENSOR CHECK

Measure the resistance between the sensor terminals under at least two temperatures. The resistance values should meet the values shown in the figure.

Note. The temperature should be within the range shown in the figure.

Scheme 73

Scheme 74

<< A >> FLEXIBLE DISCHARGE HOSE/FLEXIBLE SUCTION HOSE DISCONNECTION

To prevent the entry of dust or other foreign bodies, plug the dismantled hoses and compressor nipples.

<< B >> A/C COMPRESSOR REMOVAL

Take care not to spill any compressor oil when removing the compressor.

>> A << A/C COMPRESSOR AND CLUTCH ASSEMBLY INSTALLATION

If a new compressor is installed, first adjust the amount of oil according to the procedures described below, and then install the compressor.

Scheme 75

1. Measure the amount [X cm 3 (X fl. oz.) of oil within the removed compressor.
2. Drain (from the new compressor) the amount of oil calculated according to the following formula, and then install the new compressor. New compressor oil amount = 70 cm 3 (2.4 fl. oz.) 70 cm 3 - X cm 3 = Y cm 3 (2.4 fl. oz. - X fl. oz. = Y fl. oz.) NOTE: Y cm 3 (Y fl. oz.) indicates the amount of oil in the refrigerant line, the condenser, the evaporator, etc. NOTE: When replacing the following parts at the same times as the compressor, subtract the rated oil amount of each part from Y cm 3 (Y fl. oz.) and discharge from the new compressor.
3. Tighten A/C compressor and clutch assembly mounting bolts to the specified torque in the order of number shown in the figure. Tightening torque: 23 ± 6 N.m

A/C COMPRESSOR CLUTCH OPERATION CHECK

Connect the compressor connector terminal to the battery positive (+) terminal and ground the battery's negative (-) terminal to the compressor unit. At that time, the A/C compressor clutch should make a definite operating sound.

Scheme 76

<< A >> SELF-LOCKING NUT REMOVAL

Use the special tools below to remove the self-locking nut.

Scheme 77

<< B >> ROTOR REMOVAL

Rotor can be removed by hand, but if it is difficult to remove it, use the guide (MB992623) and the side bearing puller (MB990810) as shown in the figure.

Scheme 78

>> A << A/C COMPRESSOR HIGH PRESSURE RELIEF VALVE INSTALLATION

Check that O-ring is installed to the high-pressure relief and use the adjust torque wrench to install the high-pressure relief valve to the main body of the compressor.

>> B << FIELD CORE ATTACHMENT

Line up the pin hole on the compressor unit with the field core projection and attach.

Scheme 79

>> C << ROTOR INSTALLATION

Install the rotor while pushing the inner wheel side slowly using the pusher (MB992624) and guide (MB992623).

Note. Insert the rotor in a direction perpendicular to the A/C compressor.

Scheme 80

Scheme 81

>> D << SNAP RING INSTALLATION

Using snap ring pliers, fit the snap ring so that the snap ring's tapered part is on the outside.

Scheme 82

>> E << SELF-LOCKING NUT INSTALLATION

Using a special tool, as when removing the nut, secure the armature and tighten the self-locking nut.

>> F << AIR GAP ADJUSTMENT

Check whether or not the air gap of the clutch is within the standard value.

Standard value

0.25 - 0.45 mm (0.010 - 0.017 inch)

Note. If there is a deviation of the air gap from the standard value, make the necessary adjustment by adjusting the number of shims.

Scheme 83

A/C REFRIGERANT TEMPERATURE SWITCH

Scheme 84

Scheme 85

1. Dip the metal part of the A/C refrigerant temperature switch into engine oil and increase the oil temperature using a gas burner or similar.
2. When the oil temperature reaches the standard value, check that voltage is supplied between the terminals. Standard value: TEMPERATURE SPECIFICATIONS OF A/C REFRIGERANT TEMPERATURE SWITCH Item Temperature Less than 2 ohms Slightly below 120°C (248°F) No continuity 135°C (275°F) or more NOTE: When the oil temperature is 135°C (275°F) or more and there is no continuity, the resistance will not be 2ohms or lower until the oil temperature reduces to 120°C (248°F) or less.

Scheme 86

<< A >> FLEXIBLE SUCTION HOSE AND LIQUID PIPE A DISCONNECTION

To prevent the entry of dust or other foreign bodies, plug the dismantled hose and condenser assembly nipples.

Scheme 87

1. Lift the condenser while pressing the claw B.
2. Lift the condenser while pressing the claw A and remove it.

Scheme 88

<< A >> HOSE/PIPE DISCONNECTION

To prevent the entry of other foreign bodies, plug the condenser, compressor, and expansion valve nipples.

Scheme 89

Scheme 90

Scheme 91

See also:
• HOW TO COPE WITH INTERMITTENT MALFUNCTION
• DIAGNOSIS
• HARNESS CONNECTOR INSPECTION
• DIAGNOSTIC TROUBLE CODE CHART
• CAN BUS DIAGNOSTICS TABLE
• DIAGNOSTIC TROUBLE CODE CHART < SRS-ECU >
• EXPLANATION ABOUT THE SCAN TOOL (M.U.T.-III) CAN BUS DIAGNOSTICS
• DIAGNOSTIC TROUBLE CODE CHART
• DIAGNOSTIC TROUBLE CODE CHART
• DIAGNOSTIC TROUBLE CODE CHART
• DATA LIST REFERENCE TABLE
• ACTUATOR TEST
• DRIVE BELT TENSION CHECK
• DRIVE BELT TENSION CHECK
• DRIVE BELT TENSION CHECK
• CURB IDLE SPEED CHECK
• CURB IDLE SPEED CHECK
• CURB IDLE SPEED CHECK
• GLOVE BOX
• A/C COMPRESSOR CLUTCH RELAY ON CONDITIONS CHART
• U1415
• U0019
• U0141
• U0151
• U0154
• U0155
• U0168
• U0184
• U0195
• HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)
• DIAGNOSTIC TROUBLE CODE CHART
• A/C COMPRESSOR CLUTCH TEST
• CHARGING