OBD2

On-board diagnostics (OBD) provides vehicle self-diagnostic and reporting capabilities.
OBD2 functionality is typically required for vehicle homologation.

info

OBD2 is a premium feature not included in the standard (public) LYNX firmware.
Contact siliXcon to obtain an OEM firmware with OBD2 functionality enabled.

DTC Codes

Supported Diagnostic Trouble Codes (DTC) and their implementations:

DTC	ID	Description	LYNX Implementation Details
P0120	1	Accelerator/Pedal Position Sensor/Switch "A" Circuit	Triggers when /acc/csc output is NaN
P0122	2	Accelerator/Pedal Position Sensor/Switch "A" Circuit Low	Requires /acc/asc/absmin to be non-zero Triggers when /acc/acc/in falls below absmin Also applies to /acc/asc_2
P0123	3	Accelerator/Pedal Position Sensor/Switch "A" Circuit High	Requires /acc/asc/absmax to be non-zero Triggers when /acc/acc/in exceeds absmax Also applies to /acc/asc_2
P0500	4	Vehicle Speed Sensor "A"	Reserved for future implementation
P0A1B	5	Drive Motor "A" Control Module	Triggers when /driver/error is non-zero
P0A2A	6	Drive Motor "A" Temperature Sensor Circuit	Motor sensor temperature failure Triggers when RThermistor > 50 kOhm or < 80 Ohm
P0A2F	7	Drive Motor "A" Over Temperature	Motor overtemperature - /driver/limit & 256 Requires configured and functioning motor sensor
P0A3C	8	Drive Motor "A" Inverter Over Temperature	Driver overtemperature condition - /driver/stat & 4
P0A3F	9	Drive Motor "A" Position Sensor Circuit	Motor sensor error - /driver/stat & 16
P0C05	10	Drive Motor "A" Phase U-V-W Circuit/Open	Phase B disconnection detected at startup
P0A9B	11	Hybrid Battery Temperature Sensor "A" Circuit	Triggers upon CAN BMS connection loss

note

Motor Sensor Error

• Some sin/cos sensors may have unreliable disconnection detection

PID Codes

Parameter IDs for diagnostic data:

PID	Description
0x05	Controller temperature [°C +40]
0x8D	Motor RPM [rpm * 100]
0x5B	Battery SOC [%]

Permanents

Permanent	Description
obd_t_milon	[minutes] Time run with MIL on
obd_t_miloff	[minutes] Time run with MIL off
obd_d_milon	[km] Distance traveled with malfunction indicator lamp (MIL) on
obd_d_miloff	[km] Distance traveled with malfunction indicator lamp (MIL) off
obd_ff	Freeze frame
obd_dtc	This is an internal state to track the DTCs status. The OBD2 logic is computing from this value if the MIL is ON or OFF for each DTC.

Freeze Frame

The freeze frame is a snapshot of the vehicle's operating conditions at the time a DTC was triggered.

Field	Description
1	DTC caused the Freeze Frame
2	Motor load. 0-255 -> 0-100% of motor phase current. (From controller current range)
3 - 4	Motor RPM [rpm]
5 - 6	Runtime since engine start [s]

note

To get motor RPM or runtime since start, you need to add two number fields like this:
First field + Second field * 256 = Value

Commands

Command	Description
obd_clear	Clears all OBD2 DTCs and resets the MIL status