CANplus CP750-E
Control Panel Operation Manual
*Patent Pending
41
9M02-1000-A501-EN
Revision B
An ohmmeter reading of around 120
Ω indicates the bus to the terminator in the panel
is complete and the
problem is between the panel and the engine terminator.
An open circuit ohmmeter reading indicates the bus to the engine terminator is complete and the problem is
between the panel and the diagnostic plug.
5.
Reinstall the terminator resistor and reconnect the battery.
If the ECU diagnostic tool is available, use it to verify that the ECU is transmitting CAN data. Refer to the ECU
documentation to identify and correct the error.
If another panel is available for testing, replace the panel to determine if the error is in the panel.
11.5 Diagnostic Trouble Codes (DTC)
CAN Diagnostic Trouble Codes be a pair of numbers, the SPN (Suspect Parameter Number) and the FMI
(Failure Mode Indicator). The SPN indicates the faulting subsystem, and the FMI identifies the type of failure.
11.5.1 Typical SPNs
Standard SPN codes are defined by SAE J1939-71. Not all standard codes are provided by ECUs.
Manufacturers may add additional SPN codes beyond the codes identified in J1939-71. Refer to the ECU
documentation for supported SPNs.
Table 2: Example SPN
SPN
Description
51
Throttle Position
91
Accelerator Pedal Position
94
Fuel Delivery Pressure
98
Engine Oil Level
100
Engine Oil Pressure
110
Engine Coolant Temperature
111
Coolant Level
11.5.2 FMI
FMI codes are defined by SAE J1939-71. Refer to the ECU documentation for correct interpretation of the FMI
describes each FMI.
Table 3: FMI Descriptions
FMI
Description
0
Data valid but above normal operational range
1
Data valid but below normal operational range
2
Data erratic, intermittent or incorrect
3
Voltage above normal or shorted high
4
Voltage below normal or shorted low
