DATA LIST REFERENCE TABLE


The following items can be read by the M.U.T.-III from the electric power steering-ECU input data.

When the system is normal.


Item No.
 Check items
 Check conditions
 Normal conditions
01
 Torque sensor (main)
  • Start the engine.
  • Turn the steering wheel with a vehicle stationary.

 Centre position
 Approximately 2500 mV
Steering wheel turned to right
 2500 - 4500 mV
Steering wheel turned to left
 500 - 2500 mV
02
 Torque sensor (sub)
  • Start the engine.
  • Turn the steering wheel with a vehicle stationary.

 Centre position
 Approximately 2500 mV
Steering wheel turned to right
 2500 - 500 mV
Steering wheel turned to left
 4500 - 2500 mV
03
 Torque sensor supply voltage*
 Start the engine.
 3750 - 4250 mV
05
 Motor current
  • Start the engine.
  • Turn the steering wheel to the left and right with a vehicle stationary.

 Approximately 50 A or less
(When the steering wheel is not operated, approximately 0 V)
06
 Motor current (desired value)
  • Start the engine.
  • Turn the steering wheel to the left and right with a vehicle stationary.

 Approximately 50 A or less
(When the steering wheel is not operated, approximately 0 V)
07
 Assist limit current (limit value)
  • Start the engine.
  • Turn the steering wheel to the left and right with a vehicle stationary.

 Approximately 50 A or less
(After at least 10 minutes without operating the steering wheel, approximately 50 A)
10
 Relay voltage
  • Start the engine.
  • Turn the steering wheel to the left and right with a vehicle stationary.

 B+ (approximately 12 V) or less
11
 Vehicle speed
 Perform a test run of the vehicle.
 Speedometer displayed value and M.U.T.-III displayed value agree with each other.
12
 Engine speed
 Start the engine.
 Tachometer displayed value and M.U.T.-III displayed value agree with each other.
14
 Fail-safe relay
 Stop the engine. (Ignition switch: ON)
 OFF
Start the engine, and let it idle.
 ON
15
 Ignition switch key signal
 Ignition switch: from ON to OFF
 OFF
Ignition switch: ON
 ON
note Item No.13 (idle-up relay) is displayed on M.U.T.-III. In this case, however, the idle-up signal is not accepted by the engine-ECU, and the idle speed will not actually increase. Therefore, the item No.13 is excluded from the above table.
note *: Torque sensor is supplied either with 3 V or 8 V. Only the 8 V side of the torque sensor power supply can be monitored by M.U.T.-III as service data (Output is 8V x 0.5). Even though the 8 V-ide torque sensor power supply is normal, diagnosis code C1514 (abnormal torque sensor power supply) is displayed if any malfunction occurs in the 3 V-side power supply.

When the electric power steering-ECU shut off electric power steering system operation.


When the diagnosis system stops the electric power steering-ECU, the M.U.T.-III display data will be unreliable.