HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)
- 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)
| 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. |
Scheme 1
- Ensure that the ignition switch is at the "LOCK" (OFF) position.
- Start up the personal computer.
- Connect special tool MB991827 to special tool MB991824 and the personal computer.
- Connect special tool MB991910 to special tool MB991824
- Connect special tool MB991910 to the data link connector.
- 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.
- 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
- 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)
| 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. |
Note. If the battery voltage is low, diagnostic trouble codes will not be output. Check the battery if scan tool MB991958 does not display.
- Connect the scan tool MB991958 to the data link connector.
- Turn the ignition switch to the "ON" position.
- Select "System select" from the start-up screen.
- Select "From 2011 MY" of "Model Year." When the "Vehicle Information" is displayed, check the contents.
- 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.
- Select "Diagnostic Trouble Code" to read the DTC.
- If a DTC is set, it is shown on the scan tool.
- Choose "Erase DTCs" to erase the DTC.
HOW TO PERFORM ACTUATOR TEST
- 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)
| 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 the scan tool MB991958 to the data link connector.
- Turn the ignition switch to the "ON" position.
- Select "System Select."
- Select "AUTO A/C" from "System List," and press the "OK" button.
- Choose "Actuator Test" from "AUTO A/C" screen.
- Choose an appropriate item and select the "OK" button.
HOW TO DIAGNOSE THE CAN BUS LINE
- 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
| 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.
- Turn the ignition switch to the "ON" position.
- Select "CAN bus diagnosis" from the start-up screen.
- 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.
- Select "view vehicle information" button.
- 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 .
- Press the "OK" button.
- When the options are displayed, choose the options (mark the check) and then select "OK".
DIAGNOSTIC TROUBLE CODE CHART
| CAUTION | During 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. |
| Diagnostic trouble code No. | Diagnostic item | Reference |
|---|
| B10C0 | Interior temperature sensor system (short circuit) |
| B10C1 | Interior temperature sensor system (open circuit) |
| B1003 | Mode dial SW error | For B-Codes, refer to DIAGNOSTIC TROUBLE CODE CHART For U-Codes, refer to CAN COMMUNICATION-RELATED DTC (U-CODE) TABLE |
| B1018 | Temperature control dial SW error |
| B1021 | Fan dial SW error |
| B1031 | Air thermo sensor system (short circuit) |
| B1032 | Air thermo sensor system (open circuit) |
| B1034* | Ambient air temperature sensor system (short circuit) |
| B1035* | Ambient air temperature sensor system (open circuit) |
| B1079 | Refrigerant leaks |
| U0019 | Bus off (CAN1) |
| U0141 | ETACS-ECU time-out |
| U0151 | SRS-ECU time-out |
| U0154 | Occupant classification-ECU time-out |
| U0155 | Combination meter time-out |
| U0168 | WCM/F.A.S.T. CAN time-out |
| U0184 | Audio time-out |
| U0195 | Satellite radio tuner time-out |
| U0197 | Hands free module time-out |
| U0245 | AND-CAN out |
| U1000 | OSS-ECU time-out |
| U1415 | Coding not completed |
| NOTE: The diagnostic trouble codes marked by * are set from the ETACS-ECU. |
| NOTE |
|---|
| The diagnostic trouble codes marked by * are set from the ETACS-ECU. |
DIAGNOSTIC TROUBLE CODE CHART
Scheme 2
Scheme 2: Code No. B10C0: Interior temperature sensor system (short circuit); Code No. B10C1: Interior tempera
DTC SET CONDITION
- DTC B10C0 is set if there is a short circuit in the interior temperature sensor input circuit.
- DTC B10C1 is set if there is a defective connector connection, or if there is an open circuit in the harness.
Current trouble
- The A/C control panel, the interior temperature sensor, or connector(s) or wiring between the two may be defective.
Past trouble
- If DTC B10C0 or B10C1 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) between the A/C contrtol panel and the interior 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
- Malfunction of connector.
- Malfunction of the harness.
- Malfunction of the interior temperature sensor.
- Malfunction of the A/C control panel.
Scheme 3
- 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. Use scan tool MB991958 to diagnose the CAN bus lines. Connect scan tool MB991958. Refer to " «HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)»(ref-593021-S04866480722014011300000) ." 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 «CAN BUS DIAGNOSTIC CHART»(ref-593004-S22202362482014011300000) ).
- 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-592971-S42664974692014011300000) . NO: Go to Step 3.
- STEP 3. Check interior temperature sensor connector C-220 and A/C control panel connector C-216 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are interior temperature sensor connector C-220 and A/C control panel connector C-216 in good condition? YES: Go to Step 4. NO: Repair or replace the connector. Refer to «HARNESS CONNECTOR INSPECTION»(ref-592997-S03318112612014011300000) .
- STEP 4. Check the wiring harness between A/C control panel connector C-216 (terminals 13 and 6) and interior temperature sensor connector C-220 (terminals 2 and 1). Check the sensor signal line and ground line for open and short circuit. Q: Is the wiring harness between A/C control panel connector C-216 (terminals 13 and 6) and interior temperature sensor connector C-220 (terminals 2 and 1) in good condition? YES: Go to Step 5. NO: Repair the wiring harness.
- STEP 5. Check the interior 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 interior temperature sensor in good condition? YES: Replace the A/C control panel. Then go to Step 6. NO: Replace the interior temperature sensor. Then go to Step 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 check result satisfactory? YES: The procedure is complete. NO: Return to Step 1 .
SYMPTOM CHART
| CAUTION | During diagnosis, a DTC code associated with other 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. |
| Symptom | Inspection procedure |
|---|
| When the A/C is operation, temperature inside the passenger compartment does not decrease (Cool air is not emitted). | 1 Refer to SYMPTOM CHART |
| Malfunction of the A/C power supply system. | 2 |
| The compressor does not work. | 3 |
| Blower fan and motor do not turn. | 4 |
| Blower air amount cannot be changed. | 5 |
| Outside/inside air changeover is not possible. | 6 |
| A/C outlet air temperature does not increase. | 7 |
| Air outlet vent cannot be changed. | 8 |
| Blower motor power supply system. | 9 |
| A/C control panel power supply system. | 10 |
ACTUATOR TEST
| Item No. | Check items | Driven content |
|---|
| 2 | Idle up request | Idle-up request signal |
| 5 | In/out selection damper | The moving position of outside/inside air selection damper motor |
| 6 | Air mix damper motor | The moving position of air mix damper motor |
| 7 | Front blower fan | The amount of blower motor rotation |
| 8 | Air outlet c/o damper | Air outlet changeover damper motor moving position |
| 10 | Condenser fan | The amount of condenser fan rotation |
| 11 | Air conditioning | A/C switch selection position |
| 12 | Rear defogger switch | Rear window defogger switch selection position |
| 13 | A/T lock open request | |
Scheme 4
Scheme 4: CHECK AT A/C CONTROL PANEL TERMINAL
| Terminal No. | Check items | Check conditions | Normal conditions |
|---|
| 1 - 5 | | | |
| 6 | Sensor ground | Always | 1 V or less |
| 7 - 8 | | | |
| 9 | Ground | Always | 1 V or less |
| 10 | Battery power supply | Battery positive voltage |
| 11 | A/C pressure sensor power supply | Ignition switch: IG2 | 5 V |
| 12 | A/C pressure sensor input | SIMPLE INSPECTION OF THE A/C PRESSURE SENSOR | SIMPLE INSPECTION OF THE A/C PRESSURE SENSOR |
| 13 | Interior temperature sensor | Sensor probe temperature: 25°C (77°F) (4.0 kohms) | 2.1 to 2.7 V |
| 14 | | | |
| 15 | Power transistor (GATE) | Air volume control dial: Maximum air volume | Battery voltage |
| 16 | Power transistor (DRAIN) | 0 to 2 V |
| 17 - 19 | | | |
| 20 | IG1 power supply | Ignition switch: IG1 | Battery voltage |
| 21 - 24 | Mode selection damper control motor | |
| 25 | |
| 23 | | | |
| 24 | Motor for air outside/inside air circulation switching damper | | |
| 26 | Motor for air outside/inside air circulation switching damper | | |
| 26 | Fin thermo sensor | Sensor probe temperature: 25°C (77°F) (4.0 kohms) | 2.1 to 2.7 V |
| 27 | Fin thermo sensor ground | Always | 1 V or less |
| 28 | Motor power supply | | |
| 29 - 32 | Air mixing damper control motor |
| 33 - 36 | Outside/inside air selection damper control motor |
