Check Of Freeze Frame Data
The freeze frame data can be checked by using the scan tool MB991958.
When detecting fault and storing the diagnostic trouble code, the ECU connected to CAN bus line obtains the data before the determination of the diagnostic trouble code and the data when the diagnostic trouble code is determined, and then stores the ECU status of that time. By analyzing each data from scan tool MB991958, the troubleshooting can be performed more efficiently. The displayed items are as the table below.
DISPLAY ITEM LIST DESCRIPTION
| Item No. | Item name | Data item | Unit |
|---|---|---|---|
| 1 | Odometer | Total driving distance after the diagnostic trouble code is generated | km |
| 2 | Ignition cycle | Number of times the ignition switch is turned "ON" or "LOCK (OFF)" after the past failure transition | Number of counts is displayed. |
| 3 | FL wheel ABS control | FL wheel ABS control when the diagnostic trouble code is generated: OFF/ON | - |
| 4 | FR wheel ABS control | FR wheel ABS control when the diagnostic trouble code is generated: OFF/ON | - |
| 5 | RL wheel ABS control | RL wheel ABS control when the diagnostic trouble code is generated: OFF/ON | - |
| 6 | RR wheel ABS control | RR wheel ABS control when the diagnostic trouble code is generated: OFF/ON | - |
| 7 | EBD control | EBD control when the diagnostic trouble code is generated: OFF/ON | - |
| 8 | Brake assist control | Brake assist control when the diagnostic trouble code is generated: OFF/ON | - |
| 9 | Engine control | Traction control operation status (engine control) when the diagnostic trouble code is generated: OFF/ON | - |
| 10 | FL wheel brake TCL control | FL wheel traction control operation status (brake control) when the diagnostic trouble code is generated: OFF/ON | - |
| 11 | FR wheel brake TCL control | FR wheel traction control operation status (brake control) when the diagnostic trouble code is generated: OFF/ON | - |
| 12 | RL wheel brake TCL control | RL wheel traction control operation status (brake control) when the diagnostic trouble code is generated: OFF/ON | - |
| 13 | RR wheel brake TCL control | RR wheel traction control operation status (brake control) when the diagnostic trouble code is generated: OFF/ON | - |
| 14 | FL wheel ASC control | FL wheel ASC control when the diagnostic trouble code is generated: OFF/ON | - |
| 15 | FR wheel ASC control | FR wheel ASC control when the diagnostic trouble code is generated: OFF/ON | - |
| 16 | RL wheel ASC control | RL wheel ASC control when the diagnostic trouble code is generated: OFF/ON | - |
| 17 | RR wheel ASC control | RR wheel ASC control when the diagnostic trouble code is generated: OFF/ON | - |
| 18 | Pump motor | Pump motor condition when the diagnostic trouble code is generated: OFF/ON | - |
| 19 | Stop light switch | Stop light switch condition when the diagnostic trouble code is generated: OFF/ON | - |
| 21 | ASC off switch | ASC control condition when the diagnostic trouble code is generated: OFF/ON | - |
| 22 | Power supply voltage | Voltage of power supply when the diagnostic trouble code is generated | V |
| 23 | Steering angle | Steering angle of steering wheel sensor when the diagnostic trouble code is generated | deg |
| 24 | Yaw rate sensor | Yaw rate of G and yaw rate sensor when the diagnostic trouble code is generated | deg/s |
| 25 | Longitudinal G sensor | Longitudinal G of G and yaw rate sensor when the diagnostic trouble code is generated | G |
| 26 | Lateral G sensor | Lateral G of G and yaw rate sensor when the diagnostic trouble code is generated | G |
| 27 | Master cylinder pressure | Master cylinder pressure of Master cylinder pressure sensor when the diagnostic trouble code is generated | bar |
| 28 | FL wheel speed sensor | Wheel speed (FL) when the diagnostic trouble code is generated | km/h |
| 29 | FR wheel speed sensor | Wheel speed (FR) when the diagnostic trouble code is generated | km/h |
| 30 | RL wheel speed sensor | Wheel speed (RL) when the diagnostic trouble code is generated | km/h |
| 31 | RR wheel speed sensor | Wheel speed (RR) when the diagnostic trouble code is generated | km/h |