System Operation Description:
A solid red LED in the status indicator indicates that the MSS has not recognized a valid electronic key for that machine. This condition can be caused by several problems. One or more of the problems that are listed here could be responsible for this condition. If the electronic key has been damaged, the MSS will not disarm and the machine will not start. If a problem exists in the exciter coil, the MSS will be unable to read the electronic key. If the wiring for the exciter coil is damaged, the MSS will be unable to read the electronic key.
Note: Ensure that you have only one electronic key near the exciter coil when the MSS reads the key. If there is more than one key the MSS ECM will not be able to read the key and the machine will not start.
Test Step 1. CHECK THE KEY.
- Connect the AVSpare Electronic Technician (ET) to the Service Connector.
- Insert a valid electronic key for the machine in the key start switch.
- Turn the key switch to the ON position.
- Go to the "Service/Security Management" screen. Check the "Current Key Information".
- Check the "ID1" and "ID2" for the key that is in the key start switch.
Expected Result:
The MSS reads the ID1 code and the ID2 code as 0.
Results:
- YES - The MSS reads the ID1 code and the ID2 code as 0. The key may have failed or the problem may exist in the exciter coil. Proceed to Test Step 2.
- NO - The MSS reads the ID1 code and the ID2 code correctly. The key has been read by the MSS ECM, but the MSS is still armed. This indicates that the key in the key start switch is not authorized for that machine.
Repair: Program that key into the MSS ECM, or use a different key.
STOP
Test Step 2. CHECK THE ET DIAGNOSTIC SCREEN.
- Check the ET diagnostic screen for a communication error between the machine ECM and the Key Reader Module.
Note: The key reader communication diagnostic code is CID 1960 FMI 09.
Expected Result:
The ET reports CID 1960 FMI 09 as active or the diagnostic code has been logged.
Results:
- YES - The ET reports CID 1960 FMI 09 as active or the diagnostic code has been logged.
Repair: Troubleshoot the CAN data link connections between the key reader module and the machine ECM.
Proceed to Test Step 8.
- NO - The diagnostic code has NOT been logged or the diagnostic is NOT active. Proceed to Test Step 3.
Test Step 3. CHECK FOR POWER TO THE KEY READER MODULE.
- With the key switch in the ON position, check for system voltage between pin 1 and pin 2 of the key reader module.
Expected Result:
The voltage that is measured is approximately system voltage.
Results:
- YES - The voltage that is measured is approximately system voltage. The voltage is correct. Proceed to Test Step 4.
- NO - System voltage is NOT present. The wiring harness has failed.
Repair: Check the wiring harness for signs of damage. Repair the machine harness or replace the machine harness.
STOP
Test Step 4. CHECK THE EXCITER COIL.
- Disconnect the exciter coil from the wiring harness.
- Measure the resistance on the leads of the exciter coil.
Expected Result:
The resistance is approximately 1 ohm.
Results:
- YES - The resistance is approximately 1 ohm. Proceed to Test Step 5.
- NO - The resistance is greater than approximately 1 ohm. The exciter coil has failed.
Repair: Replace the exciter coil.
STOP
Test Step 5. CHECK THE EXCITER COIL WIRING OF THE MACHINE HARNESS FOR AN OPEN CIRCUIT.
- The exciter coil remains disconnected from the wiring harness.
- On the harness side of the connector for the exciter coil, install a jumper wire between pin 1 and pin 2 .
- Disconnect the wiring harness connector from the key reader module.
- Measure the resistance between pin 5 and pin 6 of the connector for the key reader module.
Expected Result:
The resistance is less than 5 ohms.
Results:
- YES - The resistance is less than 5 ohms between pin 5 and pin 6. The wiring for the exciter coil is correct. Proceed to Test Step 6.
- NO - The resistance is greater than 5 ohms between pin 5 and pin 6. There is a problem in the wiring for the exciter coil.
Repair: Check the wiring harness for signs of damage. Repair the machine harness or replace the machine harness.
STOP
Test Step 6. CHECK THE EXCITER COIL WIRING OF THE MACHINE HARNESS FOR A SHORT TO GROUND.
- The wiring harness connector for the key reader and the exciter coil remain disconnected.
- The jumper wire remains installed.
- Measure the resistance between pin 5 of the key reader module and frame ground.
- Measure the resistance between pin 6 of the key reader module and frame ground.
Expected Result:
The resistance is greater than 5000 ohms.
Results:
- YES - The resistance is greater than 5000 ohms. The resistance is correct. Proceed to Test Step 7.
- NO - The resistance is less than 5 ohms. The wiring harness is shorted to ground.
Repair: Check the wiring harness for signs of damage. Repair the machine harness or replace the machine harness.
STOP
Test Step 7. CHECK THE EXCITER COIL WIRING OF THE MACHINE HARNESS FOR AN SHORT TO + BATTERY.
- The wiring harness connector for the key reader module and the exciter coil remain disconnected.
- The jumper wire remains installed.
- Measure the resistance between pin 5 of the key reader module and +battery.
- Measure the resistance between pin 6 of the key reader module and +battery.
Expected Result:
The resistance is greater than 5000 ohms.
Results:
- YES - The resistance is greater than 5000 ohms. The resistance is correct. Proceed to Test Step 8.
- NO - The resistance is less than 5 ohms. The wiring harness is shorted to the + battery circuit.
Repair: Check the wiring harness for signs of damage. Repair the machine harness or replace the machine harness.
STOP
Test Step 8. CHECK THE CAN DATA LINK WIRING OF THE MACHINE HARNESS FOR AN OPEN CIRCUIT.
- Disconnect the J2 harness connector from the machine ECM.
- On the key reader side of the harness, install a jumper wire between pin 3 and pin 4.
- At the J2 of the machine ECM, measure the resistance between pin 67 and pin 68 of the connector for the machine ECM.
Expected Result:
The resistance is greater than 5000 ohms.
Results:
- YES - The resistance is greater than 5000 ohms between pin 3 and pin 4. The wiring for the CAN link, between the ECM and the key reader module is NOT correct.
Repair: Check the wiring harness for signs of damage. Repair the machine harness or replace the machine harness.
STOP
- NO - The resistance is less than 5 ohms between pin 5 and pin 6. The wiring is correct. Proceed to Test Step 9.
Test Step 9. CHECK THE CAN DATA LINK WIRING OF THE MACHINE HARNESS FOR A SHORT TO GROUND.
- The wiring harness connector for the Key Reader Module and the machine ECM remain disconnected.
- The jumper wire remains installed.
- Measure the resistance between pin 67 of the machine ECM connector J2 and frame ground.
- Measure the resistance between pin 68 of the machine ECM connector J2 and frame ground.
Expected Result:
The resistance is greater than 5000 ohms.
Results:
- YES - The resistance is greater than 5000 ohms. The resistance is correct. Proceed to Test Step 10.
- NO - The resistance is less than 5 ohms. The wiring harness is shorted to the ground.
Repair: Check the wiring harness for signs of damage. Repair the machine harness or replace
STOP
Test Step 10. CHECK THE CAN DATA LINK WIRING OF THE MACHINE HARNESS FOR A SHORT TO + BATTERY.
- The wiring harness connector for the Key Reader Module and the machine ECM remain disconnected.
- The jumper wire remains installed.
- Measure the resistance between pin 67 of the machine ECM connector J2 and + battery.
- Measure the resistance between pin 68 of the machine ECM connector J2 and + battery.
Expected Result:
The resistance is greater than 5000 ohms.
Results:
- YES - The resistance is greater than 5000 ohms. The resistance is correct. Proceed to Test Step 11.
- NO - The resistance is less than 5 ohms. The wiring harness is shorted to the + battery circuit.
Repair: Check the wiring harness for signs of damage. Repair the machine harness or replace the machine harness.
STOP
Test Step 11. CHECK THE CAN DATA LINK TERMINATION RESISTORS FOR AN OPEN CIRCUIT.
- Locate and remove the CAN data link termination resistor plugs located near the key reader module and the machine ECM. Measure the resistance between pin A and pin B on both plugs.
Expected Result:
The resistance of each resistor plug is approximately 120 ohms.
Results:
- YES - The resistance is approximately 120 ohms. The resistance is correct. Reinstall the termination resistor plugs.
Repair: The key reader module or the machine ECM has failed. It is unlikely that the key reader module or the machine ECM has failed. Perform the previous Test Steps again. If the cause of the problem is not found, replace the key reader module and test again. If the cause of the problem is still not found, replace the machine ECM. Refer to the Testing and Adjusting, "Electronic Control Module (ECM) - Replace" procedure in the service manual for your machine
STOP
- NO - The resistance is greater than 120 ohms. The termination resistors have failed.
Repair: Replace the termination resistor.
STOP