Gen3 - Faults - CAN bus and CAN Cable faults

Gen3 - Faults - CAN bus and CAN Cable faults

Notes
The Gen 3 system modules are interconnected via CAN cables and they communicate via a CAN bus protocol
The EQSS Gen 3 system is a distributed system and is made up of a number of EQSS Gen 3 modules. The modules are interconnected via a CAN bus cable and they use CAN bus frames to communicate between each other.

The CAN-H and CAN-L lines are common to all interconnected modules and are the physical connections to the CAN bus interface. 

Diagram below: Gen 3 modules CAN bus interconnection


The CCIM module has three CAN bus connection points. The one labelled 'Display' is hard wired into the CCIM and goes to the display. The other two are screw connectors and are labelled 'CAN' on the CCIM lid. These two connectors attach to the CAN bus cables. The cables that are connected to these connectors then go outside the cabin to the CPIM CAN connector and the light tower (if installed) . 



As stated above, the CPIM receives the CAN bus cable from the CCIM module and is connected to 'CCIM' port on the CPIM (as shown in the photo below). The 'BOOM' CAN bus port below is then connected to the Cable Reeler, that's mounted on the telehandler boom. All CAN communication to the cable reeler is bidirectional and travels through this cable. Furthermore, cable reeler all sensor information is passed upstream to the display via this CAN cable.



CAN Faults and Faultfinding
Like other CAN bus systems, all EQSS Gen 3 modules communicate via the same set of CAN lines. If a downstream CAN wire is damaged and goes open circuit, then only the downstream devices (CPIM, Cable Reeler) lose connectivity and communication. However, if a CAN wire is short circuited, then most probably, the entire CAN bus is incapacitated. This renders the entire system inoperable.

Problem:
If the Gen 3 Display fails to boot, shuts down and then tries to reboot. Then it continues that cycle.
OR
If the screen doesn't even try to boot, but the CCIM internal relay energises (clicks) every 7 seconds
Troubleshooting Steps:
1. Turn the Gen 3 system off
2. Disconnect the downstream CAN bus cable and the Light Tower CAN cable, at the CCIM. 
3. Turn the Gen 3 system on
4. If the Gen 3 Display now boots, then there is a problem downstream CAN line (CCIM -> CPIM cable, CPIM -> Cable Reeler cable, CPIM fault, Cable Reeler fault, Light Tower fault)
5. If the system now boots without the downstream devices, apply troubleshooting to:
  1. The CAN cables
  2. The other downstream EQSS Gen 3 modules
Problem:
After disconnecting the downstream CAN cables: the Gen 3 still will not boot

Troubleshooting Steps:
1. Turn the Gen 3 system off
2. Unscrew the lower 8-Pin connector on the back of the Display
3. Check the display connector pins and make sure they are not bent
4. If all is okay, push the cable plug back into the display and tighten the connector screw lock
5. Turn the Gen 3 system back on and observe if it now boots
6. If the Display still doesn't boot, then raise an EQSS Support Request and send both the display and the CCIM back to EQSS for diagnosis and repair
7. When EQSS support receives your support request, internal paperwork will be created and they will respond back to you with further instructions

Problem:
Screen Displays N02, N03, T01, T02 fault codes

Troubleshooting Steps:
If the only fault codes are these, then most likely the CAN cable between the the CCIM and CPIM is open circuit. 
1. Power down the Gen 3 system
2. Unscrew the CAN connector at the CCIM and inspect the cable screw connector pins for straightness. 
3. Push and screw the cable connector back into the CCIM CAN bus port
4. Power up the Gen 3 system and check to see if the fault codes are still being displayed. If the fault codes are no longer visible then the problem was the connector.
5. If the fault codes persist, then power the Gen 3 system down again
6. Go to the CPIM and unscrew the CAN cable
7. Visually inspect the pins inside the CPIM connector for straightness
8. Push and screw the cable connector back into the CPIM CAN bus port
9. Power up the Gen 3 system and check to see if the fault codes are still being displayed. If the fault codes are no longer visible then the problem was the connector.
10. If the fault codes persist, then power the Gen 3 system down again
11. If another spare cable is available: then patch it in between the CCIM and CPIM and power the Gen 3 system back on. 
12. If the fault codes are no longer visible then the problem was the cable.
13. Remove the old cable and wire in the spare replacement cable
14. If another spare cable is NOT available: then unscrew both ends of the CAN cable and carry out a conductor continuity check with an ohm/continuity meter (multimeter etc).
15. If an open circuit is found, then order (from EQSS) and replace the CAN cable
16. If the cable is found to be good but the fault codes persist, then the fault is likely within the CCIM or the CPIM modules
17. Raise an EQSS support request and send the units in for diagnosis

Problem:
Screen Displays N03, T01, T02 fault codes

Troubleshooting Steps:
If the only faults code are these, then most likely the CAN cable between the the CPIM and Cable Reeler (CALM) is open circuit. 
1. Power down the Gen 3 system
2. Unscrew the CAN connector at the CPIM and inspect the cable screw connector pins for straightness. 
3. Push and screw the cable connector back into the CPIM CAN bus port
4. Power up the Gen 3 system and check to see if the fault codes are still being displayed. If the fault codes are no longer visible then the problem was the connector.
5. If the fault codes persist, then power the Gen 3 system down again
6. Go to the Cable Reeler and unscrew the CAN cable
7. Visually inspect the pins inside the Cable Reeler connector for straightness
8. Push and screw the cable connector back into the Cable Reeler CAN bus port
9. Power up the Gen 3 system and check to see if the fault codes are still being displayed. If the fault codes are no longer visible then the problem was the connector.
10. If the fault codes persist, then power the Gen 3 system down again
11. If another spare cable is available: then patch it in between the CPIM and Cable Reeler and power the Gen 3 system back on. 
12. If the fault codes are no longer visible then the problem was the cable.
13. Remove the old cable and wire in the spare replacement cable
14. If another spare cable is NOT available: then unscrew both ends of the CAN cable and carry out a conductor continuity check with an ohm/continuity meter (multimeter etc).
15. If an open circuit is found, then order (from EQSS) and replace the CAN cable
16. If the cable is found to be good but the fault codes persist, then the fault is likely within the CPIM or the Cable Reeler modules
17. Raise an EQSS support request and send the units in for diagnosis & repair

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