CMU Data, Fail-Safe, Back-up, and Trouble Codes

CHECK ON FREEZE FRAME DATA

When judging malfunctions and storing diagnosis codes, the BMU should store the malfunction status per diagnosis code. This function is called “Freeze frame data”. By analyzing this “Freeze frame data” with the M.U.T.-III, an effective troubleshooting can be performed. The display items of freeze frame data are shown below.

Freeze Frame Data List

Item No.
Data item
Unit
1 odometer km*1
2 Ignition cycle *2
3 Elapsed time of malfunction*3 min
4 Current accumulated time of malfunction*4 min
note *1: If the odometer signal is not received from the combination meter or if invalid values are input, the FFFF km is displayed on the M.U.T.-III.
note *2: When the electric motor switch is turned to “LOCK” (OFF) position with the M.U.T.-III connected, the on board charger should be kept activated. As well, the BMU should be kept activated. Even though the electric motor switch turn to the “START” position and achieve READY status, the number may not be calculated.
note *3: Accumulated time from when malfunction is detected.
note *4: Accumulated time of current malfunction from time point when malfunction is detected.

FAIL-SAFE AND BACKUP FUNCTION

The control is carried out, which keeps the safety driving by the preset control logic when the diagnostic trouble code is set. The diagnostic trouble code having the fail-safe function is as follows.

List of fail-safe and backup function items

Code No.
Diagnosis item
Fail safe control
P1A40 Main battery current sensor (high) abnormal

  • Turn off the balancer drive.
  • The energy level gauge displays the 0 segment.
P1A41 Main battery current sensor (low) abnormal

  • Use the main battery current sensor (high) to control and turn off the balancer drive when the main battery current sensor (high) is normal.
P1A42 Power supply circuit of main battery current sensor abnormal

  • Turn off the balancer drive.
P1A43 Detection circuit of main battery current sensor abnormal

  • Turn off the balancer drive.
P1A6A CMU01 module temperature abnormal (high input)

  • Drive the main battery cooling fan for 10 minutes after judging malfunctions.
P1A6B CMU02 module temperature abnormal (high input)
P1A6C CMU03 module temperature abnormal (high input)
P1A6D CMU04 module temperature abnormal (high input)
P1A6E CMU05 module temperature abnormal (high input)
P1A6F CMU06 module temperature abnormal (high input)
P1A70 CMU07 module temperature abnormal (high input)
P1A71 CMU08 module temperature abnormal (high input)
P1A72 CMU09 module temperature abnormal (high input)
P1A73 CMU10 module temperature abnormal (high input)
P1A74 CMU11 module temperature abnormal (high input)
P1A75 CMU12 module temperature abnormal (high input)
P1A76 CMU01 battery cell voltage sensor abnormal

  • If the CMU detecting abnormalities also detects the module temperature sensor abnormalities, drive the main battery cooling fan for 10 minutes.
P1A77 CMU02 battery cell voltage sensor abnormal
P1A78 CMU03 battery cell voltage sensor abnormal
P1A79 CMU04 battery cell voltage sensor abnormal
P1A7A CMU05 battery cell voltage sensor abnormal
P1A7B CMU06 battery cell voltage sensor abnormal
P1A7C CMU07 battery cell voltage sensor abnormal
P1A7D CMU08 battery cell voltage sensor abnormal
P1A7E CMU09 battery cell voltage sensor abnormal
P1A7F CMU10 battery cell voltage sensor abnormal
P1A80 CMU11 battery cell voltage sensor abnormal
P1A81 CMU12 battery cell voltage sensor abnormal
P1A82 CMU01 module temperature sensor abnormal

  • If the CMU detecting abnormalities also detects the battery cell voltage sensor abnormalities, drive the main battery cooling fan for 10 minutes.
P1A83 CMU02 module temperature sensor abnormal
P1A84 CMU03 module temperature sensor abnormal
P1A85 CMU04 module temperature sensor abnormal
P1A86 CMU05 module temperature sensor abnormal
P1A87 CMU06 module temperature sensor abnormal
P1A88 CMU07 module temperature sensor abnormal
P1A89 CMU08 module temperature sensor abnormal
P1A8A CMU09 module temperature sensor abnormal
P1A8B CMU10 module temperature sensor abnormal
P1A8C CMU11 module temperature sensor abnormal
P1A8D CMU12 module temperature sensor abnormal
P1AA7 EV-ECU signal time-out

  • When the K-LINE is normal, use the K-LINE communication data.
P1AA8 Local CAN (for main battery) signal time-out

  • Drive the main battery cooling fan for 10 minutes after judging malfunctions.
U1926 EV-ECU CAN abnormal

  • When the K-LINE is normal, use the K-LINE communication data.

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