The following is a list of Diagnostic Trouble Codes (DTCs) that are associated with the Theft Deterrent Output Driver for the ECM.
Theft Deterrent Module ECM (MID 436) | ||
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DTC | Code Description | System Response |
1391-03 | Theft Deterrent Output Driver #1 : Voltage Above Normal | |
1391-04 | Theft Deterrent Output Driver #1 : Voltage Below Normal | |
1392-03 | Theft Deterrent Output Driver #2 : Voltage Above Normal | |
1392-04 | Theft Deterrent Output Driver #2 : Voltage Below Normal | |
5217-03 | 300mA Sourcing Driver Output #3 : Short to battery | |
5217-04 | 300mA Sourcing Driver Output #3 : Short to ground | |
5218-03 | 300mA Sourcing Driver Output #4 : Short to battery | |
5218-04 | 300mA Sourcing Driver Output #4 : Short to ground | |
5219-03 | 300mA Sourcing Driver Output #5 : Short to battery | |
5219-04 | 300mA Sourcing Driver Output #5 : Short to ground | |
5220-03 | 300mA Sourcing Driver Output #6 : Short to battery | |
5220-04 | 300mA Sourcing Driver Output #6 : Short to ground |
This diagnostic code is associated with the output driver of the MSS3s ECM. This code is recorded if voltage is present on the output driver circuit when the MSS is armed. This circuit is not used on all machines.
Note: For CID 1391 output driver #1 check for the presence of wires at contact 11 and contact 58 before you perform the procedure.
Note: For CID 1392 output driver #2 check for the presence of wires at contact 5 and contact 52 before you perform the procedure.
Possible causes for an FMI 03 diagnostic code are:
- There is a problem with the software in the ECM
- There is a short to the +battery circuit in the wiring harness
- The ECM has failed. A failure of the ECM is unlikely
Possible causes for an FMI 04 diagnostic code are:
- The wiring in the machine harness has failed
- The driven component in the circuit has failed
- The ECM has failed. A failure of the ECM is unlikely
Note: The locations of the components of the MSS will vary between machines. If the MSS was installed by a Caterpillar dealer, consult the installation instructions for component locations. If the MSS was an attachment that was installed at the factory, consult the electrical schematic for that machine.
Diagnostic Trouble Code Procedure
Note: Prior to beginning this procedure, inspect the harness connectors that are involved in this circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure, and in good condition. Ensure that the Charging System is functioning properly. Check the wiring harness for pinch points or abrasions. Look for and repair areas that indicate wires are exposed. If a problem with a connection is found, correct the problem and verify that the diagnostic code is active before performing a troubleshooting procedure.
- Identify the active FMI code associated with the components.
- Determine which code is present and use the list below to determine which procedure to follow.
- FMI 03 diagnostic code, proceed to Table 2
- FMI 04 diagnostic code, proceed to Table 3
FMI 03 Troubleshooting | ||
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Troubleshooting Test Steps | Values | Results |
1. FLASH THE ECM A. Load the latest software file for the MSS into the ECM. Refer to Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program". B. Clear the diagnostic code log. C. Start the machine and operate the machine. D. Determine if FMI 03 is present. |
FMI 03 is present. |
OK - FMI 03 is present. Go to Test Step 2. NOT OK - The diagnostic code was caused by a problem in the software. STOP. |
2. TEST THE MACHINE HARNESS A. The key start switch must be in the OFF position. B. Disconnect the machine harness from the MSS3s ECM. C. Measure the voltage between the pins on the connector for the MSS3s ECM. a. For CID 1391 Driver #1 pins 11 and 58. b. For CID 1392 Driver #2 pins 5 and 52. |
Voltage is present. |
OK - Voltage is present between the pins. The wiring harness is shorted. Repair: Repair or replace the machine harness. STOP. NOT OK - Voltage is not present between the pins. Go to Test Step 3. |
3. CHECK THE ECM A. Remove the pin from the 70 pin connector of the MSS3s ECM. a. CID 1391 pin 58. b. CID 1392 pin 52. B. Reconnect the MSS3s ECM to the system. C. Use the Cat ® ET to check the diagnostic codes. |
FMI 03 is active. |
OK - FMI 03 is active. Repair: The MSS3s ECM has an internal failure. Replace the ECM. Refer to Testing and Adjusting, "ECM - Replace". Return the failed ECM to Caterpillar. Enclose a note with the following message: "The ECM has suffered an internal short to battery voltage." STOP. NOT OK - FMI 03 is NOT active. Repair: The MSS3s ECM has an internal failure. Replace the ECM. Refer to Testing and Adjusting, "ECM - Replace". Return the failed ECM to Caterpillar. Enclose a note with the following message: "The ECM has suffered a short to battery voltage in the driver (#1 or #2) circuit." STOP. |
FMI 04 Troubleshooting | ||
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Troubleshooting Test Steps | Values | Results |
1. CHECK THE WIRING HARNESS A. Disconnect the wiring harness connector from the MSS3s ECM. B. Measure the resistance between the pin in the wiring harness and a ground on the machine. a. CID 1391 pin 11 in the wiring harness and a ground. b. CID 1392 pin 5 in the wiring harness and a ground. |
The resistance is greater than 5000 Ohms. |
OK - The resistance is greater than 5000 Ohms (no continuity). Harness circuit resistance is correct. Go to Test Step 3. NOT OK - Resistance is less than 5000 Ohms (continuity). The machine harness is faulty. There is a short between frame ground and the machine harness. The driven component in the circuit may also be bad. Go to Test Step 2. |
2. CHECK THE COMPONENT A. Trace the harness to the driven component in the circuit. The component will be a relay or a solenoid. B. Measure the resistance of the component. Measure the resistance from each terminal to the case of the component. |
The resistance is greater than 5000 Ohms. |
OK -The resistance of the driven component is greater than 5000 Ohms (no continuity). The component is good. The machine harness has failed. There is a short between frame ground and the machine harness. Repair:Check the harness for signs of damage. Repair or replace the machine harness. STOP. NOT OK -Resistance is less than 5000 Ohms (continuity). The driven component has failed. Repair:Replace the component that has failed. STOP. |
3. CHECK IF THE DIAGNOSTIC CODE IS STILL ACTIVE A. Remove the connector from the ECM. Inspect the contacts and clean the contacts of the harness connectors. B. Reconnect all harness connectors. C. Turn the key start switch to the ON position. D. Clear all inactive diagnostic codes. E. Operate the machine. F. Determine if FMI 04 is present. |
FMI 04 is present. |
OK - FMI 04 is present. Repair: The problem has not been corrected. A failure of the ECM is unlikely. Perform the previous Test Steps again. If the cause of the diagnostic code is not found, replace the ECM. See Testing and Adjusting, "ECM - Replace". STOP. NOT OK - FMI 04 is not present. Repair: The diagnostic code is NOT present. The problem does not exist at this time. The initial problem was probably caused by an intermittent short in the wiring harness. Inspect the harness for any signs of damage. If the harness passes through a hole with a grommet, that area of the harness can become chafed. Chaffing may cause an intermittent short. The harness may also be damaged in locations that could pinch the harness. Repair any wiring that could have caused the problem. Resume normal machine operation. STOP. |