939003671 - K123 WATER IN DIESEL FILTER WARNING LIGHT ON CONSTANTLY

The Engine Control Node sends a message via the C-CAN to the Body Computer, which makes it available via the B-CAN, to the Instrument Panel node.
Faults in the C-CAN will turn on the warning lights of the control units that communicate on this network. Verification of the CAN Information is intended to detect this situation
1CHECK ON SENSOR FOR PRESENCE OF WATER IN DIESEL FILTERALL OKPROBLEMS ENCOUNTEREDACTION
Check for presence of water in diesel filterCheck that the sensor supply is correctCheck the operation of the sensorMove on to Step 21. Water in the filter1. Replace the filter and refill with diesel that conforms to the specifications
2. Supply not correct2. Restore correct power supply
3. Sensor defective3. Replace the filter mounting and sensor    Op. 1060G30 WATER PRESENCE SENSOR IN FUEL FILTER - R.R.
2CHECKS USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION
Connect the Examiner diagnostic instrument and check CAN information for the absence of:

  • Inactive node/s
  • Node/s with error/s
  • Node/s with CAN network error/s
Move on to Step 61.Impossible to communicate with the Body Computer1. Move on to Step 4
2.Instrument Panel Node inactive and/or with error2. Move on to Step 7
3. Engine Control Node inactive and/or with error3.Move on step 11
4. Fault in CAN network4.Continue as instructed by the diagnostic equipment
3CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION
Use an Examiner to asses the possibility of connection to the Body Computer Node, the lack of errors and the presence of parameters.Move on to Step 31. Impossible to connect to the Body Computer control unit.1. Move on to Step 4
2. Presence of errors2. Continue as described by the diagnostic equipment
4ELECTRICAL POWER SUPPLY CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the power supply to the Body Computer Node and the wiring between the nodes are correct . Check in particular that each individual pin is correctly connectedMove on to Step 41. Fault in positive electrical supply and/or earth1. Replace defective component (in the case of a fuse, find out what caused it to blow)
2. Electrical connections not operational2. Restore the damaged wiring to correct operation.
5CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION
Use an Examiner to check the possibility of connection to the Body Computer NodeMove on to Step 2Impossible to connect to the Body Computer.Replace Body Computer    Op. 5505A32 BODY COMPUTER - R.R
6CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION
Using an Examiner check, in Instrument Panel mode, that there are no errors and that the parameters are presentMove on to Step 81. System fault1. Move on to Step 7
2. Fault on CAN network2. Move on to Step 14
3. Presence of errors. Continue as described by the diagnostic equipment
7ELECTRICAL POWER SUPPLY CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check the electricity supply to the node is correct.Check the wiring between the Body Computer and the Instrument Panel. In particular, check that each individual pin is properly connectedMove on to Step 71. Fault in positive electrical supply and/or earth1. Replace defective component (in the case of a fuse, find out what caused it to blow)
2. Electrical connections not operational2. Restore the damaged wiring to correct operation.
8CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION
Using an Examiner check, in Instrument Panel mode, that there are no errors and that the parameters are presentMove on to Step 8Fault persists.Replace the Instrument Panel    Op. 5560B10 CONTROL PANEL - R+R
9ACTIVE DIAGNOSIS CHECKALL OKPROBLEMS ENCOUNTEREDACTION
With the Examiner in Instrument Panel Node mode, check that the warning light in question is correctly activated in Active Diagnosis.Move on to Step 9The warning light in question does not flashReplace the Instrument Panel    Op. 5560B10 CONTROL PANEL - R+R
10CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION
Keeping the diagnostic instrument connected, check the Engine Management Node for the absence of:

  • System/component faults
  • Faults in the CAN network/s
Move on to Step 111.System/components faulty1.Move on to step 11
2. Fault in CAN network2.Move on to Step 13
3.Presence of errors3.Continue following the instructions for the diagnostic equipment
11ELECTRICAL POWER SUPPLY CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check the electricity supply to the node is correct.Check the wiring between the Body Computer and the NCM. In particular, check that each individual pin is properly connectedMove on to Step 121. Fault in positive electrical supply and/or earth1. Replace defective component (in the case of a fuse, find out what caused it to blow)
2. Electrical connections not operational2. Restore the damaged wiring to correct operation.
12CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION
Using an Examiner check, in Engine Management Node mode, that there are no errors and that the parameters are present.Move on to Step 13Fault persistsReplace the Engine Management Control Unit    Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R
13ACTIVE DIAGNOSIS CHECKALL OKPROBLEMS ENCOUNTEREDACTION
With the Examiner in Engine Control Node mode, check that the water presence warning light is correctly activated in Active Diagnosis.Move on to Step 14The warning light does not flashReplace the Engine Management Control Unit    Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R
14ELECTRICAL POWER SUPPLY CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check the node power supply/electrical connections are correct. Check the (network) wiring between Engine Management, Body Computer and Instrument Panel. Check, in particular, that each individual pin is correctly connected to each node.Move on to Step 151. Fault in positive electrical supply and/or earth1. Replace defective component (in the case of a fuse, find out what caused it to blow)
2. Electrical connections not operational2. Restore the damaged wiring to correct operation.
15CHECK ON CORRECT OPERATIONALL OKPROBLEMS ENCOUNTEREDACTION
Check that the fault is no longer presentEnd of diagnosis