DEM-000A

DTC DEM-000A





Condition
The Differential Electronic Module (DEM) checks if the power supply for the control module is within the permitted limits by comparing the signal with a calculated value.

Diagnostic Trouble Code (DTC) DEM-000A is stored if the control module registers a power supply lower than 8.5 Volts for 25 seconds or greater than 18.5 Volts for 3 seconds.

Diagnostic Trouble Code (DTC) DEM-000A can be diagnosed with the engine running and the engine speed (RPM) >500 rpm.

Substitute value
- Four wheel drive is blocked.

Possible source

Signal too high:
- Short-circuit to ground.

Signal too low:
- Open-circuit in the power supply.

Fault symptom[s]
- Four wheel drive is not functioning.





Condition
The control modules transmit and receive information via a standardized serial communication method -Control Area Network (CAN). The Diagnostic Trouble Code (DTC) is stored if the control module registers serious interference (CAN communication blocked).

Note! In the event of system communication problems, it is not possible to communicate with the control module. Therefore it will only be possible to read off the fault if it is intermittent.

Substitute value
- The control module shuts itself off ("bus-off")

Hint: The control module will remain shut off until the power supply is broken (15, 30, X). when the power supply is connected the control module will make a new attempt to communicate.

Possible source
- Short-circuit between the Control Area Network (CAN) wiring
- Open-circuit in the Control Area Network (CAN) wiring
- Internal fault in the control module
- Internal fault in another control module in the same part of the Control Area Network (CAN).

Fault symptom[s]
- Four wheel drive is not functioning
- Message in the display (not S60 model year 2002)
- The anti-spin warning lamp is lit (up to and including 2002 model year)
- General warning lamp lit.





Condition
The control module compares its configuration ID with the signal configuration transmitted on the Control Area Network (CAN) by the Central Electronic Module (CEM). If the configuration IDs do not correspond the fault code is stored. The Diagnostic Trouble Code (DTC) is also stored if the communication between the control module and the Central Electronic Module (CEM) is interrupted.

Note! In the event of an open-circuit in both the Control Area Network (CAN) cables, it is not possible to communicate with the control module. Therefore it will only be possible to read off the Diagnostic Trouble Code (DTC) if this type of fault is intermittent. When the Diagnostic Trouble Code (DTC) is stored, the control module responds to the diagnostic command, however normal control area network (CAN) communication does not work. ("Expulsion mode")

Substitute value
- None.

Possible source
- Faulty Control Area Network (CAN) configuration ID. (The node is not intended for this car (for example a used control module with different software/hardware))
- Open-circuit in the Control Area Network (CAN) wiring between the control module and the Central Electrical Module (CEM).

Fault symptom[s]
- Four wheel drive is not functioning
- Message in the display (not S60 model year 2002)
- The anti-spin warning lamp is lit (up to and including 2002 model year)
- General warning lamp lit (from model year 2003 inclusive).