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| Illustration 1 | g06163907 |
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CAN A Data Link connections | |
The MID 161 - CID 3643 diagnostic code is associated with the operational communication between the VIMS Main ECM and the Motor 1 ECM. The communication is conducted on the data link circuit.
The FMI 9 means that the VIMS Main ECM has lost communication with the "Motor 1" ECM.
The conditions that could cause the VIMS Main ECM to activate this diagnostic code are:
- An open circuit or a poor connection in a data link circuit between the "VIMS Main" ECM and the "Motor 1" ECM.
- A software problem in the "Motor 1" ECM or the ECM has failed.
- The "VIMS Main" ECM has failed.
If the MID 161 - CID 3643 is active and no other controls modules have activated a diagnostic code, a circuit problem is unlikely. This procedure assumes that this diagnostic code is the only diagnostic code active.
If the "VIMS Main" ECM and both the motor control ECM's have activated multiple diagnostic codes, a system problem is likely. One cause could involve a terminating resistor or an open circuit in the cabinet or in the machine wiring harness outside the cabinet. The resistance of disconnected terminating resistors is 120 ohms. The resistance of the system between the high and low circuits with power off should be approximately 60 ohms. The controls that are not communicating can be an indication of what part of the system is involved.
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| Illustration 2 | g01935155 |
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Location of the CAN A "Y" connectors in the cabinet low voltage compartment (1) CAN-A1 Y connector location (2) CAN-A2 Y connector location | |
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| Illustration 3 | g06163346 |
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Inverter Cabinet compartments that may require entries for this procedure (3) Low voltage Inverter compartment that contains the terminal blocks (4) Low voltage Inverter compartment that contains the "Motor 2" ECM | |
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| Illustration 4 | g06163357 |
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Image of the top right-hand low voltage Inverter Cabinet compartment. (5) "Motor 2" ECM (6) "Motor 1" ECM | |
The "Motor 1" ECM controls the following system operations:
- Sends operational data to the "VIMS Main" ECM on the CAN A Data Link circuit.
- Creates and regulates the three phases of AC power that are sent to the right-hand "Traction Motor 1". The electrical current is based on the torque commands that are received from the Drivetrain ECM. The "Motor 1" ECM also monitors the motor speed status, the current of each of the three phases and the voltage of the DC Power Bus.
- Monitors the operating temperature of the "Traction Motor 1" windings and bearings.
- Enables the "Interface Module 1" operation and enables the Interface Module 2 operation.
- Regulates and monitors the operation of theretarding contractor that are used during retarding and discharging of the DC Power Bus, when required.
- Regulates and monitors the operation of the Chopper Module to control the voltage level of the DC Power Bus, control the retarding function, and discharge the DC bus when required.
- Controls the operation of the grid blower inverter pilt relay to reset the Retarding Grid Blower Inverter when required.
- Monitors the input status from the DC Bus Voltage 1 Sensor (DCPT 1) and from the DC Bus Voltage 2 Sensor (DCPT 2) DC Power Bus voltage sensors.
- Monitors the input status from the Ground Fault Detection Sensor.
- Will send a request to activate the Crowbar to the Motor 2 ECM to discharge the DC Power Bus immediately when required.
The "VIMS Main" module assists the service personnel with machine maintenance and troubleshooting. The "VIMS Main" module stores information about events in the data files. The files are accessed using Cat Electronic Technician (Cat ET). The operator is alerted to the existence of abnormal machine conditions via the "Advisor" display module. A high system temperature is an example of an event.
Events are related to a machine system. The operator usually needs to respond to an event. For example, the operator needs to modify operation to cool the oil temperature for the converter when the temperature is too high. When such an event is present, the operator is shown information on the "Advisor" screen. A fault with the electrical system of the machine is called a diagnostic. A diagnostic requires a service technician to investigate the cause and complete required repairs.
"VIMS 3G" uses two ECM's. The ECM's are called the "Main" module and the "Application" module.
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| Illustration 5 | g01770577 |
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VIMS 3G ECM | |
The Module Identifier (MID) codes for the "VIMS 3G" ECM are listed below:
- MID 161 - "VIMS 3G Main" ECM
- MID 162 - "VIMS 3G Application" ECM
Test Step 1. CHECK THE DATA LINK CIRCUITS FOR OPEN CIRCUITS
- Turn the battery disconnect switch and the key start switch to the OFF position.
- At the front of the "Inverter Cabinet", remove the low voltage compartment cover (4).
- At the Motor 1 ECM, disconnect the machine harness connector J1. Examine the pins and sockets on the ECM and on the J1 harness connector. Ensure that all the pins and sockets are secured in the connector, the contacts are clean, and the contacts are in good condition. Connect a jumper wire between the CAN A high contact J1-66 and the CAN A low contact J1-67.
- At the "VIMS Main" ECM, disconnect the machine harness connector from the ECM. Examine the pins and sockets on the ECM and on the harness connector. Ensure that all the pins and sockets are secured in the connector, the contacts are clean, and the contacts are in good condition.
- At the "VIMS Main" ECM, harness connector, measure the resistance between contact 50 (wire Y956-YL(Yellow)) and contact 34 (wire Y957-GN(Green)).
- While observing the resistance measurement, wiggle the harness connector for the "VIMS Main" ECM and wiggle the harness connector for the Motor 1 ECM. Do not disconnect the jumper wire. While observing the resistance measurement, individually wiggle the CAN A "Y" connectors, CANA-2 and CANA-1.
- At the harness connector J1 for Motor 1 ECM, disconnect the jumper wire from the CAN A high (J1-66) and the CAN A low (J1-67).
- At the harness connector J1 for Motor 1 ECM, measure the resistance of the circuits between the CAN A high (J1-66) and the CAN A low (J1-67).
Expected Result:
The resistance measurement with the jumper wire connected is 5 ohms or less always during the manipulation of the circuit connectors. The resistance measurement with the jumper wire disconnected is approximately 60 ohms.
Results:
- OK - When the jumper wire is connected, the resistance measurement is 5 ohms or less during the manipulation of the circuit connectors. The "CAN A" data link circuit between the "Motor 1" ECM and the "VIMS Main" ECM is not open or appear to have a poor connection. When the jumper wire is disconnected, the resistance measurement is approximately 60 ohms. The terminal resistors in the circuit are connected and are in good condition. Proceed to Test Step 2.
- NOT OK - Either the resistance measurement with the jumper wire connected is greater than 5 ohms or the resistance measurement with the jumper disconnected is not 60 ohms.
Repair: If the resistance measurement with the jumper wire connected is greater than 5 ohms, there is an open or a poor connection in the data link circuits between the "VIMS Main" ECM and the "Motor 1" ECM.
Refer to the connection diagram at the beginning of this procedure. All the data link connection points between the two ECMs are illustrated in the diagram. Locate and examine all the connections in the circuit. Check each wire at each connection for poor connections or loose connections in the connector. Ensure that all connections are clean, secure, and in good condition.
With the jumper wire disconnected, if the resistance measurement between the high and low circuits is greater than 60 ohms, one of the terminal resistors has either failed or is disconnected from the circuit. Disconnect each terminal resistor and individually check the resistance of each resistor. The resistance should be 120 ohms. Replace the resistors if necessary.
STOP
Test Step 2. CHECK THE STATUS OF THE DIAGNOSTIC CODE
- Inspect the harness connectors that are disconnected. Clean the contacts of the harness connectors. Check the wires for damage to the insulation that can be caused by excessive heat or chafing.
- Reconnect all harness connectors. Make sure that the connectors are fully seated and the clips for each connector are fastened. Ensure that the retaining bolts are properly tightened.
- Do not install the cabinet low voltage compartment covers now.
- Turn the battery disconnect switch to the ON position. Turn the key start switch to the ON position. Do not start the engine.
- Determine if the MID 161 - CID 3643 - FMI 9 diagnostic code is active.
Expected Result:
The MID 161 - CID 3643 - FMI 9 diagnostic code is not active.
Results:
- OK - The MID 161 - CID 3643 - FMI 9 diagnostic code is no longer active. The problem does not exist currently.
Repair: The initial diagnostic code could have been caused by a momentary condition. The problem could have been caused by a connector problem that was resolved when the connector was disconnected and reconnected. Resume normal operation.
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- NOT OK - The MID 161 - CID 3643 - FMI 09 diagnostic code is active. The problem has not been corrected.
Repair: Perform this procedure again. Verify again that there is no problem with the cabinet wiring or with any of the connectors in the circuits.
If the diagnostic code remains active or if the diagnostic code is repeatedly activated and no cause can be found, proceed to Test Step 3.
Test Step 3. CHECK THE OPERATION OF THE ECM
All the disconnected connections are now connected.
The low voltage compartment covers are removed.
In this step, the two motor control ECM' s will be switched to determine if the "Motor 1" ECM is causing the code to be activated in error.
Both of the motor control modules use the same software. The ECM' s can be switched without flashing new software. Later in this step, new software may be flashed to the ECM to rule out a software problem. The following procedure will give instruction on when flashing software may be required.
- Turn the key start switch to the OFF position. Turn the battery disconnect switch to the OFF position.
- At the "Motor 1" ECM, disconnect the J1 and the J2 connectors. Disconnect the cabinet ground to ECM case ground connection. Remove the "Motor 1" ECM from the mount. Mark the ECM case in some way that will allow the ECM to be identified as the original "Motor 1" ECM.
- At the "Motor 2" ECM, disconnect the J1 and the J2 connectors. Disconnect the cabinet ground to ECM case ground connection. Remove the "Motor 2" ECM from the mount.
- Mount the marked ECM on the mount where the "Motor 2" connectors can be connected. Connect the ground connection. Securely connect the J1 and the J2 connectors to the ECM.
- Mount the unmarked ECM on the mount where the "Motor 1" connectors can be connected. Connect the ground connection. Securely connect the J1 and the J2 connectors to the ECM.
- Turn the battery disconnect switch to the ON position. Start the Engine and safely operate the truck for a short time in the retarding mode.
- Check the status of the MID 161 - CID 3643 - FMI 9 diagnostic code.
Expected Result:
The MID 161 - CID 3643 - FMI 9 diagnostic code is no longer active. A MID "161 - CID 2995 FMI 9" diagnostic code has been activated by the "VIMS Main" ECM.
Results:
- YES - The "VIMS Main" ECM has now activated a MID 161 - CID 2995 - FMI 9 diagnostic code for the "Motor 1" ECM. The marked ECM could be causing the problem. The marked ECM that is now in the "Motor 2" ECM position has caused the VIMS Main ECM to loose communication. The unmarked ECM that is in the "Motor 1" ECM position appears to be communicating with the "VIMS Main" ECM.
Repair: To verify that the marked ECM is causing the problem, switch both ECMs back to the original locations. Place the marked ECM back to the original location as the "Motor 1" ECM. Place the unmarked ECM back to the original location as the "Motor 2" ECM. Ensure that all the harness connections and ground connections are connected and securely tightened.
Check the status of the diagnostic code again. If the MID 161 - CID 3643 - FMI 9 is activated again, the marked motor control ECM is faulty. The diagnostic code has only been activated by the "VIMS Main" ECM for communication with the marked ECM.
Both of the motor control modules use the same software. To rule out a software problem, obtain the latest released version of motor ECM software. Flash the suspect motor ECM with the same released version of software that is loaded on the other motor ECM.
To ensure software compatibility between the control modules on the truck, the installed software in the modules must be from the same released software version.
If a later version of software is released, flash the latest version to both of the motor control ECMs. The software that is loaded on the "VIMS Main" ECM must be from the same released version as the software that is loaded in the motor control ECMs. When necessary, flash the "VIMS Main" ECM with software from the same released version as the software for the motor control ECMs.
For the more information on the requirements that must be followed when flashing software to an ECM, refer to Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program".
If the diagnostic code is still being activated, replace the marked motor control ECM.
Refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for instructions on replacing the ECM.
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- NO - The MID 161 - CID 3643 - FMI 9 diagnostic code has been activated by the "VIMS Main" ECM for communication with the unmarked ECM that is connected in the "Motor 1" ECM position. Switching the motor control ECMs did not change the status of the MID 161 - CID 3643 - FMI 9 diagnostic code. There is still a problem in the data link circuits between the "VIMS Main" ECM and the "Motor 1" ECM.
Repair: Repeat this procedure. Carefully check all the data link circuits and connectors. Check the continuity of all the wire segments and connectors.
If a cause for this diagnostic code cannot be found and the "VIMS Main" ECM is still activating the diagnostic code, flash the latest version of software to the "VIMS Main" ECM.
Ensure that you have the latest version of software for your specific machine and ECM. Ensure that the software is from the same release as the software that is loaded on the other machine controls.
For the more information on the requirements that must be followed when flashing software to an ECM, refer to Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program".
If the latest version of software has been flashed to the ECM and the diagnostic code is still being activated, contact the Technical Communicator at your dealership. Indicate the steps that have been taken to try to resolve this problem.
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