Marine Multi-Station Control System Caterpillar

There is a loss of communications with the electronic troll processor. The power train control processor (PCP) and the electronic troll processor (ETP) do not communicate.

Note: The PCP 1817 - FMI 09 diagnostic code becomes active when the Backup panel is activated. This is a normal condition and does not indicate a loss of J1939 communications.

Note: The PCP and the ETP communicate on the J1939 data link.

Perform this procedure if a 1326-09 diagnostic code is active.

If an 1817-09 diagnostic code is active at the same time that a 1326-09 diagnostic code is active, go to Troubleshooting, "PCP CID 1326 - FMI 09".

Test Step 1. CHECK THE ELECTRICAL CONNECTIONS AND WIRING.

1. Inspect the harnesses between the ETP and the ECM. Inspect the harnesses for the following conditions:

   • Corrosion

   • Abrasion

   • Pinch points

   • Incorrect attachment

Expected Result:

All harnesses are in good condition.

Results:

• OK - All harnesses are in good condition. Go to Test Step 2.

• NOT OK - All harnesses ARE NOT in good condition.

  Repair: Repair the harnesses or replace the harnesses.

  Verify that the diagnostic code is NOT active.

  STOP

Test Step 2. ENSURE THAT THE NUMBER OF TERMINATING RESISTORS IS CORRECT.

1. Ensure that there is only one terminating resistor connected at the TEE connector for the ETP.

2. Ensure that there is only one terminating resistor connected at the display/J1939 data link. The second terminating resistor is connected to the TEE connector that is on the last display.

There are two terminating resistors connected to the data link. One terminating resistor is placed at the ETP TEE connector. The second terminating resistor is placed on the last display on the data link for the J1939 display.

Expected Result:

The proper number of terminating resistors is present.

Results:

• OK - The proper number of terminating resistors is present. Go to Test Step 3.

• NOT OK - The proper number of terminating resistors IS NOT present.

  Repair: Install the proper number of terminating resistors.

  STOP

Test Step 3. MEASURE THE VOLTAGE AT THE CONNECTOR FOR THE ETP.

1. Ensure that the keyswitch is OFF.

2. Disconnect the data link cable from the ETP.

3. Turn the keyswitch ON.

4. Use a digital volt meter (DVM) in order to measure the voltage between pin 1 and pin 2.

Expected Result:

The voltage is between 22 VDC and 27 VDC for a 24 VDC system. The voltage is between 11 VDC and 14 VDC for a 12 VDC system.

Results:

• OK - The voltage is correct. Go to Test Step 8.

• NOT OK - The voltage IS NOT correct. Go to Test Step 4.

Test Step 4. VERIFY THE VOLTAGE AT THE TERMINATING RESISTOR.

1. Turn the keyswitch OFF.

2. Disconnect the terminating resistor and the TEE connector from the data link cable.

3. Turn the keyswitch ON.

4. Use a digital volt meter in order to measure the voltage between pin 1 and pin 2.

Expected Result:

The voltage is between 22 VDC and 27 VDC for a 24 VDC system. The voltage is between 11 VDC and 14 VDC for a 12 VDC system.

Results:

• OK - The voltage is between 22 VDC and 27 VDC for a 24 VDC system. The voltage is between 11 VDC and 14 VDC for a 12 VDC system.

  Repair: Repair the harness or replace the data cable for the ETP.

  Verify that the diagnostic code is NOT active.

  STOP

• NOT OK - The voltage IS NOT between 22 VDC and 27 VDC for a 24 VDC system. The voltage IS NOT between 11 VDC and 14 VDC for a 12 VDC system. Go to Test Step 5.

Test Step 5. MEASURE THE VOLTAGE AT THE 6-PIN CONNECTOR ON THE ENGINE HARNESS.

1. Turn the keyswitch OFF.

2. Connect the 6-pin data link cable from the engine harness.

3. Turn the keyswitch ON.

4. Use a DVM in order to measure the voltage between pin 1 and pin 2 on the 6-pin connector for the engine harness.

Expected Result:

The voltage is between 22 VDC and 27 VDC for a 24 VDC system. The voltage is between 11 VDC and 14 VDC for a 12 VDC system.

Results:

• OK - The voltage is between 22 VDC and 27 VDC for a 24 VDC system. The voltage is between 11 VDC and 14 VDC for a 12 VDC system.

  Repair: Replace the engine harness to TEE 6-pin cable.

  Verify that the diagnostic code is NOT active.

  STOP

• NOT OK - The voltage IS NOT between 22 VDC and 27 VDC for a 24 VDC system. The voltage IS NOT between 11 VDC and 14 VDC for a 12 VDC system. Go to Test Step 6.

Test Step 6. MEASURE THE VOLTAGE AT THE J3/P3 CONNECTOR.

1. Turn the keyswitch OFF.

2. Disconnect the engine harness from the customer connector.

3. Turn the keyswitch ON.

4. Use a DVM in order to measure the voltage between pin 30 and pin 10 on the MJB to ECM harness. Make this measurement at the MJB end of the harness.

Expected Result:

The voltage is between 22 VDC and 27 VDC for a 24 VDC system. The voltage is between 11 VDC and 14 VDC for a 12 VDC system.

Results:

• OK - The voltage is between 22 VDC and 27 VDC for a 24 VDC system. The voltage is between 11 VDC and 14 VDC for a 12 VDC system. Go to Test Step 7.

• Not OK - The voltage IS NOT between 22 VDC and 27 VDC for a 24 VDC system. The voltage IS NOT between 11 VDC and 14 VDC for a 12 VDC system.

  Repair: Repair the engine harness or replace the engine harness.

  STOP

Test Step 7. MEASURE THE VOLTAGE AT THE TEE CONNECTOR.

1. Turn the keyswitch OFF.

2. Disconnect the ECM J3 harness from the MJB.

3. Turn the keyswitch ON.

4. Use a DVM in order to measure the voltage between pin 12 and 38 on MJB.

5. Continue to measure the voltage between the following pin combinations:

• Pin 12 and pin 39

• Pin 13 and pin 39

• Pin 23 and pin 47

• Pin 30 and pin 56

• Pin 31 and pin 57

Expected Result:

The voltage is between 22 VDC and 27 VDC for a 24 VDC system. The voltage is between 11 VDC and 14 VDC for a 12 VDC system.

Results:

• OK - The voltage is between 22 VDC and 27 VDC for a 24 VDC system. The voltage is between 11 VDC and 14 VDC for a 12 VDC system.

  Repair: Replace the MJB to ECM harness.

  Verify that the diagnostic code is NOT active.

  STOP

• NOT OK - The voltage IS NOT between 22 VDC and 27 VDC for a 24 VDC system. The voltage IS NOT between 11 VDC and 14 VDC for a 12 VDC system.

  Repair: Go to the Special Instruction, REHS0354, "Charging System Troubleshooting".

  STOP

Test Step 8. MEASURE THE RESISTANCE OF THE DATA LINK (OPEN CIRCUIT TEST).

1. Turn the keyswitch OFF.

2. Disconnect the ETP from the J1939 data link.

3. Remove the terminating resistor from the TEE connector.

4. Disconnect the ECM from the J1939 data link.

5. Disconnect the PCP from the J1939 data link.

6. Disconnect the Marine Power Displays from the J1939 data link.

7. Disconnect the terminating resistor from the TEE connector to the last Marine Power Display.
   Show/hide table

   Illustration 1	g01032533
   The service tools are to be supplied by the dealer.

8. Connect the continuity connectors to the J1939 cable. Connect one at the 6-pin connector for the ETP cable. Connect the other at the drop for the last Marine Power Display. Refer to illustration 1.

9. Use a DVM in order to measure the resistance between pin 10 and pin 7. Wiggle the harness during the measurement in order to reveal an intermittent condition.

Expected Result:

The resistance is less than 20 Ohms.

Results:

• OK - The resistance is less than 20 Ohms. Go to Test Step 9.

• NOT OK - The resistance IS NOT less than 20 Ohms. There is an open circuit in the harness. Continue to test the individual sections of the data link harness.

Test Step 9. MEASURE THE RESISTANCE OF THE DATA LINK (SHORT CIRCUIT TEST).

1. Turn the keyswitch OFF.

2. Disconnect the ETP from the J1939 data link.

3. Remove the terminating resistor from the TEE connector.

4. Disconnect the ECM from the J1939 data link.

5. Disconnect the PCP from the J1939 data link.

6. Disconnect the Marine Power Displays from the J1939 data link.

7. Disconnect the terminating resistor from the TEE connector to the last Marine Power Display.

8. Continue to measure the resistance with the pin combinations that are listed in table 1.
   Show/hide table

   Table 1

   Measure from MPD Connector Pin Number	Circuit Name	Measure to MPD Connector Pin Number	Circuit Name
   7	CAN Data +	12	+Battery
   7	CAN Data +	11	-Battery
   7	CAN Data +	10	Station Lockout
   7	CAN Data +	9	Can Shield
   7	CAN Data +	8	Can Data -
   8	CAN Data -	12	+Battery
   8	CAN Data -	11	-Battery
   8	CAN Data -	10	Station Lockout
   8	CAN Data -	9	Can Shield

Expected Result:

The resistance is greater than 20000 Ohms.

Results:

• OK - The resistance is greater than 20000 Ohms.

  Repair: Temporarily replace the ETP.

  Verify that the diagnostic code is NOT active.

  STOP

• NOT OK - The resistance IS NOT greater than 20000 Ohms. Continue to check the individual sections of the data link cable.

  STOP