37-TROUBLE CODE DIAGNOSIS

DIAGNOSTIC FUNCTION

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

Required Special Tools:

MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
MB992745: V.C.I.-Lite main harness A
MB992747: V.C.I.-Lite USB cable short
MB992748: V.C.I.-Lite USB cable long
MB991958: Scan Tool (M.U.T.-III Sub Assembly)

MB991824: Vehicles 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 (M.U.T.-IIISE), always turn off the power supply mode of the electric motor switch before connecting or disconnecting scan tool (M.U.T.-IIISE).

1. Ensure that the power supply mode of the electric motor switch should be turned off.

2. Start up the personal computer.

3. Connect special tool MB992747/M992748 or special tool MB991827 to special tool MB992744 or special tool MB991824 and the personal computer.

4. Connect special tool MB992745 or special tool MB991910 to special tool MB992744 or special tool MB991824.

5. Connect special tool MB992745 or special tool MB991910 to the data link connector.

note	When the special tool MB992745 is connected to the data link connector, the special tool MB992744 indicator light will be illuminated in a green color.

6. Turn the power switch of special tool MB991824 to the "ON" position. <When using the special tool MB991824>

note	When special tool MB991824 is energized, 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 scan tool (M.U.T.-IIISE) is the reverse of the connecting sequence, making sure that the power supply mode of the electric motor switch should be turned off.

HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODES

Required Special Tools:

MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
MB992745: V.C.I.-Lite main harness A
MB992747: V.C.I.-Lite USB cable short
MB992748: V.C.I.-Lite USB cable long
MB991958: Scan Tool (M.U.T.-III Sub Assembly)

MB991824: Vehicles 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)

note	If the 12V Starter Battery voltage is low, diagnostic trouble codes will not be set. Check the battery if scan tool (M.U.T.-IIISE) does not display.

1. Connect scan tool (M.U.T.-IIISE) to the data link connector.

2. Turn on the power supply mode of the electric motor switch.

3. Select "STV."

4. Select "ECPS/4WS."

5. Select "Diagnostic Trouble Code" to read the DTC.

6. If a DTC is set, it is shown.

7. Select "Erase DTCs" to erase the DTC.

HOW TO READ DATA LIST

Required Special Tools:

MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
MB992745: V.C.I.-Lite main harness A
MB992747: V.C.I.-Lite USB cable short
MB992748: V.C.I.-Lite USB cable long
MB991958: Scan Tool (M.U.T.-III Sub Assembly)

MB991824: Vehicles 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)

1. Connect the scan tool (M.U.T.-IIISE) to the data link connector.

2. Turn on the power supply mode of the electric motor switch.

3. Select "STV."

4. Select "ECPS/4WS."

5. Select "Data List."

6. Select an appropriate item and select the "OK" button.

HOW TO PERFORM ACTUATOR TEST

Required Special Tools:

MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
MB992745: V.C.I.-Lite main harness A
MB992747: V.C.I.-Lite USB cable short
MB992748: V.C.I.-Lite USB cable long
MB991958: Scan Tool (M.U.T.-III Sub Assembly)

MB991824: Vehicles 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)

1. Connect the scan tool (M.U.T.-IIISE) to the data link connector.

2. Turn on the power supply mode of the electric motor switch.

3. Select "STV."

4. Select "ECPS/4WS."

5. Select "Actuator Test."

6. Select an appropriate item and select the "OK" button.

HOW TO DIAGNOSE THE CAN BUS LINES

Required Special Tools:

MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
MB992745: V.C.I.-Lite main harness A
MB992747: V.C.I.-Lite USB cable short
MB992748: V.C.I.-Lite USB cable long
MB991958: Scan Tool (M.U.T.-III Sub Assembly)

MB991824: Vehicles 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)

1. Connect scan tool (M.U.T.-IIISE) to the data link connector.

2. Turn on the power supply mode of the electric motor switch.

3. Select "CAN bus diagnosis" from the System select screen.

4. When the optional equipment screen is displayed, choose the one which the vehicle is fitted with, and then select the "OK" button.

CHECK OF FREEZE FRAME DATA

The freeze frame data can be checked by using scan tool (M.U.T.-IIISE).

When detecting the trouble and storing the diagnostic trouble code, the ECU connected to CAN bus line obtains the data when the diagnostic trouble code is confirmed, and then stores the ECU status of that time. By analyzing each data from scan tool (M.U.T.-IIISE), the troubleshooting can be performed more efficiently. The displayed items are as the table below.

Display item list

Item No.	Item name	Data item	Unit
01	Odometer	Total driving distance when the diagnostic trouble code is generated	km/mile
02	Ignition cycle	Number of times the power supply mode of the electric motor switch is turned ON or OFF after the past failure transition	Number of counts is displayed.
04	Accumulated minute	Cumulative time for current malfunction of diagnostic trouble code	min
06	Torque sensor (main)	Voltage of the main torque sensor when the diagnostic trouble code is generated	V
07	Torque sensor (sub)	Voltage of the sub torque sensor when the diagnostic trouble code is generated	V
08	Torque sensor (power supply)	Voltage of torque sensor power supply when the diagnostic trouble code is generated	V
09	Resolver voltage 1	Voltage of the motor angle sensor signal when the diagnostic trouble code is generated.	V
10	Resolver voltage 2		V
11	Relay voltage	Voltage of power supply relay when the diagnostic trouble code is generated	V
12	Vehicle speed	Vehicles speed when the diagnostic trouble code is generated	km/h/mph
13	Assist flag for Engine	Not used.	-
14	Assist flag for EV	Indicates the status of the steering assist.	OFF/ON
15	Engine speed lost flag	Not used.	-
16	Engine speed fail flag	Not used.	-
17	EV-ECU READY lost flag	The EPS-ECU can not receive the READY signal from the PHEV-ECU.	OFF/ON