- Asphalt Paver
- AP1000F (S/N: AC41-UP)
- AP1055F (S/N: TJ51-UP; RLM1-UP)
- AP500F (S/N: 5031-UP; AF51-UP; 4491-UP; F5M1-UP)
- AP555F (S/N: AP51-UP; M451-UP; 5F51-UP; RBM1-UP)
- AP600F (S/N: AP61-UP; LR61-UP)
- AP655F (S/N: 4801-UP; 4521-UP; 4531-UP; P651-UP; 6551-UP; MH61-UP; ML61-UP; 4791-UP)
- AP1055F (S/N: TJ51-UP; RLM1-UP)
- Asphalt Screed
- SE50 V (S/N: J971-UP)
- SE50 VT (S/N: J6K1-UP)
- SE60 V (S/N: JJ31-UP)
- SE60V XW (S/N: JS91-UP)
- SE60VT XW (S/N: TLW1-UP)
- SE50 VT (S/N: J6K1-UP)
Introduction
Do not perform any procedure in this Special Instruction until you have read the information and you understand the information.
The 5-6-10XXF series pavers and SE50-60 series screeds have several CAN networks and an Ethernet system. The following information will help with understanding and troubleshooting communication problems.
The CAN System
There are several different CAN networks on these machines that serve different purposes:
- CAN A, 711 yellow/712 green twisted pair. Primarily used for ECM to ECM communication.
- CAN B, 787 yellow/788 green twisted pair. Primarily used for ECM to ECM communication.
- CAN C, 959 yellow/960 green twisted pair. Primarily used for key pad to ECM communication.
- CAN D, 797 yellow/798 green twisted pair. Primarily used for communication between engine/DEF/emissions components.
- CAN E, 960 yellow/961 green twisted pair. Primarily designated CAN network for Cat Grade Control sensors to the Cat Grade Control ECM.
Understanding Paver / Screed CAN A, B, and C Resistors
A design standard of CAN networks is to have one terminating resistor at each end of the circuit. The resistors absorb CAN signals from bouncing back in the CAN lines which creates "noise", and as a result, machine malfunctions. Each of these resistors is 120 ohms. When the two resistors are connected in parallel circuit, the CAN circuit resistance drops to 60 ohms.
The paver and screed is a unique combination, because the paver can be disconnected from the screed and operated independently. When the paver is by itself, the rear CAN resistors need to be connected, so CAN network operates properly. Below is a simplified diagram of just one of the CAN networks on a paver, and the resistors. See Illustration 1.
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| Illustration 1 | g06207618 |
Once the screed is attached to the paver, the CAN networks are extended out to the screed harnesses. This is when the rear paver CAN resistors are disconnected, and the CAN resistors on the screed then take over as the rear CAN resistors. This CAN network configuration applies to the CAN A, B, and C networks. See Illustration 2.
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| Illustration 2 | g06207667 |
For the other CAN networks, D and E, the resistors for those networks are on either the paver or the screed, and are not changed when the screed is disconnected from the paver.
Symptoms of CAN Network Malfunctions
- Functions cease to operate.
- Machine powers up, but the engine will not crank over.
- Engine cooling fan speeds up to maximum unexpectedly.
- Operator console select does not work when the select button is held.
- Stars (***) showing on displays, or Cat ET status boxes where there is normally a reading.
- Green LED lights constantly flashing on any of the key pads.
- Any CAN data link diagnostic code, such as a CID 246.
Troubleshooting Tips
Check machine functionality from all possible areas, as this may give clues to the area of the problem. Below are some examples:
- You may be able to propel the paver, but not extend the screed from the paver stations, but the screed extends from the screed stations. This would indicate that the problem lies in the network in between the machine control and screed ECM.
- The green LED’s are flashing on only one of the operator panels. The problem is most likely with the CAN wiring in that panel, or at the connection that enters the panel.
- The green LED’s on one of the key pads are glowing dimly, or abnormally. Compare the lights to a similar key pad.
- Look for obvious damage, such as remote pendent harness damage, or other harness damage.
When CAN issues arise, the three major causes are:
- Disconnected or damaged wiring.
- Loose or corroded connections.
- A faulty component, such as an ECM or key pad, are corrupting one of the CAN networks. When the CAN network is corrupted, it prevents CAN signals from getting through to where they need to go.
Troubleshooting Steps for CAN A, B, and C
- Verify that CAN wiring is correct
Turn ignition switch and battery switch OFF. Check the CAN resistance of the three main networks, CAN A, B, and C. Locate the three CAN connections on the rear inside the paver frame. See Illustration 3. They are each a three-pin connector with a yellow/green twisted wire pair connected.
Unplug each connector from the blank plug. Using a multi-meter, measure the resistance across the two terminals of each of the three connectors. A proper CAN network will measure 59-61 ohms, in each of the three locations. As a side check, make sure that there is no continuity in between any of the CAN wires and frame ground, indicating a direct short to ground. See Illustration 4. If the resistance value of all three CAN networks falls within 59-61 ohms, but the paver has major issues like not starting, stars and flashing lights, proceed to Step 6. If the value does not fall within 59-61 ohms, leave the meter connected, and disconnect the paver to screed 40-pin connection. See Illustration 5. Look for one of the following two results.
Resistance goes to 118-122 ohms after screed to paver harness is disconnected:
This means that the paver CAN network is proper, the circuit resistance is reading the paver’s forward CAN resistor. The problem lies on the screed CAN network wiring. Note which CAN network is on harness connector tag, CAN A, CAN B, or CAN C. Proceed to Step 2.
Resistance is anything other than 118-122 ohms after the screed to paver harness is disconnected.
This means that the paver CAN network is improper, there is a corrupt component or wiring issue on the paver. Proceed to Step 3.
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Illustration 4 g06208059 10XXF Shown Show/hide table
Illustration 5 g06208063 - On the 40-pin screed to tractor harness connector, locate the CAN network pair that is the suspect, using Illustration 6. Read the resistance between those two pairs of wires. If there is no resistance reading (meter reads OL), trace that CAN network using the appropriate screed schematic, looking for broken, or damaged wires. If there is a reading, anything other than 118-122 ohms, disconnect the screed electrical components one at a time, until the resistance is in the 118-122 ohm range. Components would be the operator panels (then individual key pads), screed heat ECM, implement ECM. Check to see that the three screed CAN resistors are attached, and read 118-122 ohms each. See Illustration 18. Replace any components that are causing the CAN resistance to be incorrect. If the CAN resistance is still incorrect, after disconnecting the components, the problem lies in the harnesses. Move to Step 4 when complete.
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Illustration 6 g06208076 - With the meter still connected, proceed as follows:
- No resistance (meter reads OL), trace that CAN network using the appropriate paver schematic, looking for broken, or damaged wires / harnesses.
- Any resistance reading other than 118-122 ohms, begin disconnecting electrical components on the paver to isolate a bad component that may be causing the problem. Components would be the operator panels (then individual key pads), relay driver ECM, generator ECM, product link ECM, engine ECM, diesel exhaust fluid controller. See below for information on the Machine and Transmission ECM.
Note: If troubleshooting the CAN A network, know that CAN A routes through the Machine Control and Transmission ECM’s in a series fashion. If you are unfamiliar with which ECM’s are the Machine Control or Transmission Control, visit the interactive electrical schematic. Disconnecting either / both of those ECM’s will break the CAN A circuit. To isolate the Machine Control or Transmission Control ECM’s the CAN wiring must be jumped together at the machine harness J2 connectors. See Illustration 7. All other electrical components on the paver can be disconnected to isolate the components from the CAN circuit.
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Illustration 7 g06208165 On the machine harness J2 connector, Connect pin 56 to 67 and 68 to 70 with jump wires. - If a faulty component / harness was identified that was causing the CAN resistance to be incorrect, replace all affected parts. Reconnect all components. Reconnect the paver to screed connection. See Illustration 5. With the ignition and battery switch OFF, recheck the resistance of CAN A, B, and C. There needs to be 59-61 ohms of resistance at each of the three connections. See Illustration 4.
- If all three of the CAN network resistances are correct, turn on the battery switch, and ignition switch. Start the paver. Does the paver start, and functions work correctly? If no, go to step 6.
- At this point, the resistance of the CAN networks has been verified to be correct. The cause of the issue may be an electrical component that is corrupting the CAN network with the ignition key on. Using a multi-meter, read the voltage from each CAN wire to frame ground. See Illustration 8.
- 711 yellow to frame
- 712 green to frame
- 787 yellow to frame
- 788 green to frame
- 959 yellow to frame
- 960 green to frame
The voltage on each CAN wire will range from 1.5 to 2.5 volts. Any voltages reading lower or higher than that indicates that CAN network is being corrupted by a component, when the power is on. On a normally operating machine, the voltage may fluctuate between 0.1 and 2.5 volts for the first several seconds, as the ECM’s are initializing.
Show/hide table
Illustration 8 g06208174 (10XXF Shown) Connect negative lead to frame, measure VDC on each individual CAN wire.
The next step is to locate the source of corruption by a process of elimination. With the ignition key still on, and meter still reading the circuit with the incorrect voltage, begin disconnecting components, watching for the voltage reading to change to a normal range of 1.5 - 2.5 V.
Disconnect screed to paver connector (if the CAN voltage goes normal, the source of corruption is on the screed, reconnect connector and begin isolating electrical components from the screed. Go to Step7. If the CAN voltage is still incorrect, the source of corruption is on the paver, go to Step 8. - Disconnect the screed components, one at a time, while watching the CAN voltage
- Screed (implement) ECM
- Screed heating element control ECM
- Remote pendant controls
- Both screed control panels, one at a time. If CAN voltage went correct, then reconnect and isolate the display and individual key pads.
Replace any components that are affecting the CAN circuit voltage. Reconnect all components and harnessing, and repeat Step 6, where the CAN voltages are checked.
- Disconnect the paver components, one at a time, while watching the CAN voltage:
- Product Link / Radio Control
- Engine ECM connector (machine harness connector)
- Diesel exhaust fluid controller
- Relay driver module ECM
- 40-pin connection that enters each operator panel. If CAN voltage went correct, then reconnect and isolate the display and individual key pads.
- Machine Control ECM (see note below)
- Transmission control ECM (see note below)
Replace any components that are affecting the CAN circuit voltage. Reconnect all components and harnessing, and repeat Step 6, where the CAN voltages are checked.
Note: If troubleshooting the CAN A network voltage, know that CAN A routes through the Machine Control and Transmission ECM’s in a series fashion. If you are unfamiliar with which ECM’s are the Machine Control or Transmission Control, visit the interactive electrical schematic. Disconnecting either / both of those ECM’s will break the CAN A circuit. To isolate the Machine Control or Transmission Control ECM’s the CAN wiring must be jumped together at the machine harness J2 connectors. See Illustration 9. All other electrical components on the paver can be disconnected to isolate them from the CAN circuit.
Note: If all the ECM’s are disconnected, the CAN voltage will go to zero, because nothing is powering it. There have been some rare cases where all the ECM’s are corrupt, due to a lightning strike. In this case, a “known good” ECM is needed to power the CAN circuit, while isolating the rest of the ECM’s on / off the CAN circuit.
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| Illustration 3 | g06207760 |
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10XXF Shown | |
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| Illustration 9 | g06208386 |
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On the machine harness J2 connector, Connect pin 56 to 67 and 68 to 70 with jump wires. | |
CAN Resistor Locations
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| Illustration 10 | g06208428 |
Rear paver CAN A, B, and C all models. (Unused when screed is connected). See Illustration 10.
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| Illustration 11 | g06208436 |
10XXF CAN A resistor, by engine mount, either on a clip, or secured to harness. See Illustration 11.
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| Illustration 12 | g06208443 |
CAN B resistor, under RH station. (all models). See Illustration 12.
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| Illustration 13 | g06208464 |
CAN C resistor, under fuse panel. (all models similar) See Illustration 13.
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| Illustration 14 | g06208473 |
AP5XXF CAN A and CAN D resistors. See Illustration 14.
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| Illustration 15 | g06208483 |
AP5XXF, AP6XXF CAN D second resistors are located inside the Diesel Exhaust Fluid controller. (CAN resistor is not serviceable, AP5XXF shown). See Illustration 15.
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| Illustration 16 | g06208570 |
AP10XXF CAN D resistors, one is external on the frame, the other is inside the Diesel Exhaust Fluid controller. See Illustration 16.
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| Illustration 17 | g06209080 |
AP6XXD CAN A and CAN D resistors. (secured to harness by engine mount). See Illustration 17.
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| Illustration 18 | g06209100 |
CAN A,B,C resistors on screed. On the right side of main screed body, SE50/60 series screeds. See Illustration 18.
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| Illustration 19 | g06209124 |
CAN E resistors, for Cat Grade Control sensor network. One CAN 289-9632 Receptacle As is at the end of EACH end gate harness for early models, and under tower cover, late models. (late model shown) See Illustration 19.
CAN D
The CAN D network, the 797 yellow/798 green twisted pair is located only on the paver. It provides a path for communication in between the Diesel Exhaust Fluid (DEF) Controller and the Engine ECM. Symptoms of malfunction would be diagnostic codes logged by the engine ECM for failure to communicate with the DEF Controller. Check the CAN D resistors, and CAN D wiring in between the engine ECM and DEF controller. If the wiring is correct, the DEF controller may be at fault.
CAN E
The CAN E network, the 960 yellow/961 green twisted pair is dedicated for communication in between the Cat Grade sensors and Cat Grade ECM. A symptom of problems with this network would be no grade control sensor function. In the grade control diagnostic menu, check the sensor connectivity screen. See Illustration 28.
One of the most common causes of no sensor connectivity is that the sensors have lost supply power. When the sensors are not powered, they emit no data over CAN E. Regardless of the screed model, the following can be checked at the 10-pin sensor port:
- Pin A = 12v power sourced from 24-12v converter on the screed
- Pin B = Frame ground
- Pin D = 960 yellow CAN, routes to the Cat Grade ECM, pin 56.
- Pin H = 961 green CAN, routes to the Cat Grade ECM, pin 48.
CAN E Resistors
The CAN E resistors, 289-9632 Receptacle As, is on each side of the screed, by the end gates. See Illustration 19. Like the other CAN resistors, these resistors measure 120 ohms each, between pins 3 and 4, in the unpowered state.To check for the proper 60 ohms of resistance on the CAN E network, turn off the ignition and battery switch. Using a multi-meter, measure the resistance in between pins D and H of the 10-pin sensor ports. For the 7-pin sensor port, measure in between pins B and D. Like the other CAN networks, there should be 59-61 ohms of resistance between the respective pins.
The 289-9632 Receptacle As resistors are special, in the manner that they are switching resistors. When a sonic averaging ski is connected, a circuit is completed, which switches the resistor OFF inside the
Basic CAN Diagrams
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| Illustration 20 | g06212189 |
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| Illustration 21 | g06212224 |
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| Illustration 22 | g06212227 |
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| Illustration 23 | g06212231 |
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| Illustration 24 | g06212234 |
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| Illustration 25 | g06212239 |
The Ethernet System
The 5-6-10XXF series pavers have an Ethernet system, separate from the CAN system. The Ethernet system serves two main purposes:
- High-speed data load capability for programming the paver and screed graphical displays.
- Display to grade ECM communication, for the Cat Grade Control (if equipped)
The machine may have an Ethernet problem, and still function normally. The two symptoms that may indicate an Ethernet problem:
- Cannot make an Ethernet direct connection to one or more of the display’s to reprogram the display software.
- "ECM Disconnect" messages are appearing on the Cat Grade Control screen (if equipped).
- "2D Display Disconnect" messages are appearing on the Cat Grade Control screen (if equipped).
Ethernet Configuration
The Ethernet wiring is configured differently, depending on if the Cat Grade Control option is present or not. This is accomplished by installing or removing jumper plugs on the paver and screed. If Cat Grade Control is installed, the Cat Grade ECM acts as the central hub for the Ethernet. See Illustration 26. If there is no Cat Grade Control, the Ethernet is connected in a series fashion, between the display’s. See Illustration 27.
Ethernet Configuration With Cat Grade Control Installed
Numbers on monitors and grade ECM correspond to the numbers shown on the electrical schematics. See Illustration 26.
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| Illustration 26 | g06209617 |
Ethernet Configuration With NO Cat Grade Control
Numbers on monitors correspond to the numbers shown on the electrical schematics. See Illustration 27
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| Illustration 27 | g06209633 |
Troubleshooting Steps
- No Ethernet connection via Cat ET
- Ensure that the Ethernet connection directions are being followed as per SEHS0522.
- Follow the instructions under the Cat ET “Help” tab for Ethernet direct connection.
- Check the Ethernet wiring between the service port and the left paver display.
- Not all 4 displays are detected with Cat ET when making an Ethernet direct connection.
- Check in the Ethernet wiring between the displays as required. If no wiring problems are found, the display itself might be faulty, or Cat Grade ECM, if equipped. Ensure that wiring is good by doing continuity checks with a meter, from point to point on all Ethernet wires, before replacing displays or Cat Grade ECM.
- The Ethernet service port is wired to the left paver display. If only the left paver display is detected, there might be a problem with that display, or the Ethernet wiring connecting it to the rest of the system. Check the Ethernet wiring / connections, then swap the displays side to side and see that of the problem follows.
- “ECM Disconnect”, or “2D Display” message appears on Cat Grade Control screens:
- This means that there is not a good Ethernet connection in between the display and the Cat Grade ECM. The Ethernet wiring will have to be verified by doing continuity checks.
- There are also a few other places to look when attempting to diagnose and Ethernet connection issue on machines that are equipped with Cat Grade Control. One is the sensor connectivity screen in the Cat Grade Control diagnostic menu. (Illustration 28) This screen will also show the monitors present, along with whatever grade sensors are connected. Look at this same screen on each of the four displays, to help figure out what is not connected.
- Inside the Cat Grade Control diagnostic menu, there is also an "Report" menu which shows "Ethernet Checks". The monitors and Cat Grade ECM constantly send "ping" signals back and forth. (Illustration 29) When there is a problem, the ping status will read "bad". Again, the first thing to do is a continuity test of the Ethernet wires in between that monitor and the Cat Grade ECM.
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| Illustration 28 | g06209651 |
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| Illustration 29 | g06209653 |