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Automatic Air Conditioning: Diagnosis Mitsubishi Galant IX рестайлинг 2

Automatic HVAC System 7 illustrations ~1293 words

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 (Vehicles with CAN communication system)
CAUTIONTo prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

Scheme 1

Scheme 1
Scheme 1
  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 (Vehicles with CAN communication system)
CAUTIONTo prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

Note. If the battery voltage is low, diagnostic trouble codes will not be output. 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 "Interactive Diagnosis" from the start-up screen.
  4. Select "System Select."
  5. Choose "AUTO A/C" from the "BODY" tab.
  6. Select "MITSUBISHI."
  7. Select "Diagnostic Trouble Code to read the DTC."
  8. If a DTC is set, it is shown.
  9. Choose "Erase DTC" to erase the DTC.

HOW TO PERFORM ACTUATOR TEST

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 (Vehicles with CAN communication system)
CAUTIONTo prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
  1. Connect the scan tool MB991958 to the data link connector.
  2. Turn the ignition switch to the "ON" position.
  3. Select "Interactive Diagnosis" from the start-up screen.
  4. Select "System Select."
  5. Choose "AUTO A/C" from the "BODY" tab.
  6. Select "MITSUBISHI."
  7. Choose "Actuator Test" from "AUTO A/C" screen.
  8. Choose an appropriate item and select the "OK" button.

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
CAUTIONTo prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
  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".

DIAGNOSTIC TROUBLE CODE CHART

CAUTIONDuring diagnosis, a DTC code associated with another system may be set when the ignition switch is turned on with connector(s) disconnected. After completing the repair, confirm all systems for DTC code(s). If DTC code(s) are set, erase them all.
DTC No.Diagnostic itemReference
B1001Interior temperature sensor system (short circuit)
B1002Interior temperature sensor system (open circuit)
B1011Ambient air temperature sensor system (short circuit)Refer to DIAGNOSTIC TROUBLE CODE CHART
B1012Ambient air temperature sensor system (open circuit)
B1021Air thermo sensor system (short circuit)
B1022Air thermo sensor system (open circuit)
B1041Air mixing damper control motor and potentiometer (potentiometer system shorted to its power supply)
B1042Air mixing damper control motor and potentiometer (potentiometer system shorted to its ground or open circuit)
B1045Air mixing damper control motor and potentiometer (activating system failure)
B1061Mode selection damper control motor and potentiometer (potentiometer system shorted to its power supply)
B1062Mode selection damper control motor and potentiometer (potentiometer system shorted to its ground or open circuit)
B1065Mode selection damper control motor and potentiometer (activating system failure)
U1073Bus off
U1100 (1)Powertrain control module time-out (related to engine)
U1111 (1)Multi-center display unit (middle grade type) time-out
U1120Failure information on powertrain control module (related to engine)
(1) When the DTC relating to the CAN communication error are output, make sure of the vehicle equipment. When the vehicle is not equipped with the system the A/C-ECU communicates to, the DTC is always output. This is not abnormal.
(1)When the DTC relating to the CAN communication error are output, make sure of the vehicle equipment. When the vehicle is not equipped with the system the A/C-ECU communicates to, the DTC is always output. This is not abnormal.

DIAGNOSTIC TROUBLE CODE CHART

Scheme 2

Scheme 2: DTC B1001, B1002: Interior Temperature Sensor System
Scheme 2: DTC B1001, B1002: Interior Temperature Sensor System

DTC SET CONDITION

  1. DTC B1001 is set if there is a short circuit in the interior temperature sensor input circuit.
  2. DTC B1002 is set if there is a defective connector connection, or if there is an open circuit in the harness.

Current trouble

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

Past trouble

  1. If DTC B1001 or B1002 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) between the A/C-ECU and the interior 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.

TROUBLESHOOTING HINT

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

DIAGNOSIS

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

Scheme 3

Scheme 3
Scheme 3

Scheme 4

Scheme 4
Scheme 4

Scheme 5

Scheme 5
Scheme 5

Scheme 6

Scheme 6
Scheme 6

Scheme 7

Scheme 7
Scheme 7
  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. (Refer to «CAN BUS DIAGNOSTIC CHART»(ref-373543-S10979998422010101300000) ). Then go to Step 7 .
  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 check result satisfactory? YES: It can be assumed that this malfunction is intermittent. Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTIONS»(ref-373542-S22512035972010101300000) . NO: Go to Step 3.
  3. STEP 3. Using scan tool MB991958, check data list. 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 to the data link connector. Start the engine. Set scan tool MB991958 to the data reading mode. Item 01: Interior temperature sensor. Check that the interior temperature matches the displayed value on the scan tool. NOTE: When this DTC is set and the system is in fail-safe status, the value of service data displays 25°C. Turn the ignition switch to the "LOCK" (OFF) position. Q: Does the interior temperature match the displayed value on the scan tool? YES: Replace the A/C-ECU. Then go to Step 7 . NO: Go to Step 4.
  4. STEP 4. Check A/C-ECU connector C-15, C-16 and interior temperature sensor connector C-123 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are A/C-ECU connectors C-15, C-16 and interior temperature sensor connector C-123 in good condition? YES: Go to Step 5. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(ref-373544-S41741678532010101300000) . Then go to Step 7 .
  5. STEP 5. Check the wiring harness between A/C-ECU connector C-15 (terminals 20), C-16 (terminals 22) and interior temperature sensor connector C-123 (terminals 1 and 2). 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»(ref-373544-S41741678532010101300000) . Check the sensor signal line and ground line for open and short circuit. Q: Are the wiring harnesses between A/C-ECU connector C-15 (terminals 20), C-16 (terminals 22) and interior temperature sensor connector C-123 (terminals 1 and 2) in good condition? YES: Go to Step 6. NO: Repair the wiring harness. Then go to Step 7 .
  6. STEP 6. Check the interior temperature sensor. Disconnect interior temperature sensor connector C-123. When the resistance between the sensor terminals is measured under two or more temperature conditions, the resistance should approximately satisfy the illustrated values. NOTE: The temperature conditions when checking should not exceed the range shown in the illustration. Q: Is the interior temperature sensor in good condition? YES: Replace the A/C-ECU. Then go to Step 7. NO: Replace the interior temperature sensor. 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 check result satisfactory? YES: The procedure is complete. NO: Return to Step 1 .

SYMPTOM CHART

CAUTIONDuring diagnosis, a DTC code associated with another system may be set when the ignition switch is turned on with connector(s) disconnected. On completion, confirm all systems for DTC code(s). If DTC code(s) are set, erase them all.
SymptomInspection procedure No.Reference
When the ignition switch is "ON", the A/C does not operate.1REFER TO SYMPTOM CHART
When the air outlet changeover control knob is moved to DEFROSTER or DEFROSTER/FOOT position, the A/C or the inside/outside air changeover damper motor does not operate.2
Outside/Inside air changeover is not possible.3
When the A/C is operating, temperature inside the passenger compartment does not decrease (cool air is not emitted).4
Front blower fan and motor do not turn.5
Front blower air amount cannot be changed.6
The A/C indicator flashes.7
Defogger function does not operate.8
Defogger timer function does not operate.9
Malfunction of the A/C-ECU power supply system.10
Condenser fan does not operate.11REFER TO SYMPTOM CHART

SYMPTOM CHART

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