939003673 - K125 DISPLAY DOES NOT SHOW RANGE ON TRIP MODULE

With the key ON, the range reading on the display (one of the displays on the TRIP COMPUTER module) is not operational.
The display shows the range processed by the instrument panel node on the basis of information received from the body computer node (distance and fuel level as a percentage) and from the engine management node (consumption) made available to the instrument panel node via the B-CAN and C-CAN networks respectively.This data is then weighed on the capacity of the tank, programmed at the end of the line.
In the absence of speed information (from the Brake Node) or instantaneous fuel consumption data (from the Engine Control Node) or fuel level (from the Body Computer), the range information will be replaced by the reading "----"
0PRELIMINARY CHECKSALL OKPROBLEMS ENCOUNTEREDACTION
Interview the customer to check that the TRIP function have not been recently resetMove on to Step 1One of the Trip Computer functions has been resetThe display reading will be "----" until sufficient distance has been covered to allow fuel consumption to be evaluated: if the value is not displayed after a few kilometres, continue to Step 1
1CAN CHECKSALL OKPROBLEMS ENCOUNTEREDACTION
Connect an EXAMINER and check the following on CAN NETWORK INFORMATION:

  • No control units inactive
  • No faulty control units
  • No control units with faulty CAN line
Move on to Step 21. Fault on CAN network1. Continue following the instructions for the diagnostic equipment
2. Communication impossible with the Body Computer2. Move on to Step 7
2CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION
Keeping the diagnostic instrument connected, check the following on the BRAKE NODE:

  • No system/component errors
  • No CAN faults
Move on to Step 31. System/components faulty1. Continue following the instructions for the diagnostic equipment
2. Fault on C-CAN network2. Move on to Step 11
3CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION
Keeping the diagnostic instrument connected, check the following on the ENGINE CONTROL NODE:

  • No system/component errors
  • No CAN faults
Move on to Step 41. System/components faulty1. Continue following the instructions for the diagnostic equipment
2. Fault on C-CAN network2. Move on to Step 11
4CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION
Keeping the diagnostic instrument connected, check the following on the INSTRUMENT PANEL NODE:

  • No system/component errors
  • No CAN faults
Move on to Step 51. System/components faulty1. Continue following the instructions for the diagnostic equipment
2. Fault on C-CAN network2. Move on to Step 11
5ACTIVE DIAGNOSIS CHECKALL OKPROBLEMS ENCOUNTEREDACTION
With the Examiner in Instrument Panel Node mode check that all segments of the LCD module are correctly activated in Active Diagnosis.Move on to Step 61. One or more segments does not activate1. Replace the Instrument Panel    Op. 5560B10 CONTROL PANEL - R+R
2. Communication impossible with the instrument panel2. Move on to Step 6
6ELECTRICAL POWER SUPPLY CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check the electricity supply to the Instrument Panel Node is correctMove on to Step 7Fault in positive electrical supply and/or earthReplace defective component (in the case of a fuse, find out what caused it to blow)
7CHECK ELECTRICAL CONNECTIONSALL OKPROBLEMS ENCOUNTEREDACTION
Check the wiring between the Body Computer and the Instrument Panel. In particular, check that each individual pin is properly connectedMove on to Step 8Electrical connections not operationalRenew the damaged electrical connections
8CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION
Using an Examiner check, in Body Computer Node mode, that there are no errors.Move on to Step 91. Impossible to connect to the Body Computer control unit.1. Move on to Step 10
2. Presence of errors2. Continue by following the instructions on the diagnostic instrument
9CHECK ON FUEL LEVEL SENSORALL OKPROBLEMS ENCOUNTEREDACTION
Check correct operation of the fuel level sensor by carrying out the Test    See Test 1040AC FUEL LEVEL GAUGE CHECKCheck that the sensor is correctly connected to the Body ComputerMove on to Step 101.Sensor defective1.Replace sensor    Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
2.Sensor wiring interrupted2.Renew the wiring
10ELECTRICAL POWER SUPPLY CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check the electricity supply to the Body Computer Node is correct.Move on to Step 11Fault in positive electrical supply and/or earthReplace defective component (in the case of a fuse, find out what caused it to blow).
11CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION
Use an Examiner to check the possibility of connection to the Body Computer Node.Move on to Step 12Impossible to connect to the Body Computer control unit.Replace Body Computer    Op. 5505A32 BODY COMPUTER - R.R
12CHECK ON CORRECT OPERATIONALL OKPROBLEMS ENCOUNTEREDACTION
Check that the fault is no longer presentEnd of diagnosis