- There is a problem with a circuit breaker on the MJB
- There is a problem with the - Battery connections to the ECM
- There is a problem with the unswitched battery connections to the ECM
- The wiring from the PCP to the MJB has failed
- The wiring from the MJB to the ECM has failed.
- There is problem with the station control head or the button panel.
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| Illustration 1 | g00918436 |
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Button Panel (1) Indicator for "station active" (2) Button for "station active" (3) Button for throttle synchronization (4) Indicator for throttle synchronization (5) Indicator for slow vessel mode (6) Button for slow vessel mode ("SVM") (7) Indicator for "troll" mode (8) Button for "troll" mode (9) Indicator for gear lockout (10) Button for gear lockout | |
- To verify that the button panel or ICH buttons are functioning properly, run the "Button Panel - Test" in the "Diagnostic Functional Tests" section of this manual.
OK: There is not a problem with the button panel and the wiring to the PCP. Go to Step 8.
NOT OK: continue with Step 2.
- Verify that the circuit breakers on the MJB have not been tripped. Turn the key switch ON and press the breaker button to verify that the breaker has not been tripped.
Expected Result: The breakers have not been tripped.
Results:
OK - The breakers have not been tripped. Go to Test Step 3.
NOT OK - One or more of the breakers have been tripped.
Repair: Reset the breaker and test the system. If the breaker trips again, check the wiring related to that breaker.
STOP.
- CHECK THE NEGATIVE BATTERY CIRCUIT.
Using a multimeter, measure the resistance from the -battery terminal on the battery, to each -battery contact on the wiring harness connector for the ECM.
Expected Result: Each resistance measurement is less than 10 ohms.
Results:
OK - Each resistance measurement is less than 10 ohms. Go to Test Step 4.
NOT OK - One or more of the resistance measurements is greater than 10 ohms.
Repair: There is a problem with the -battery circuit. Repair the wiring harness or replace the wiring harness.
STOP.
- CHECK THE VOLTAGE AT THE BATTERIES.
Use a multimeter to measure the voltage across the battery posts on the battery.
Expected Result: The voltage is 11 to 14 VDC for a 12 VDC system or 22 to 28 VDC for a 24 VDC system.
Results:
OK - The voltage is 11 to 14 VDC for a 12 VDC system or 22 to 28 VDC for a 24 VDC system. Go to Test Step 5.
NOT OK - The voltage is NOT 11 to 14 VDC for a 12 VDC system or 22 to 28 VDC for a 24 VDC system.
Repair: There is a problem with the batteries or the charging circuit. Repair the charging circuit or replace batteries.
STOP.
- CHECK THE VOLTAGE AT THE MJB.
Using a multimeter, measure the voltage across the battery terminals on the MJB.
Expected Result: The voltage is within 0.1 V of the measurement at the battery.
Results:
OK - The voltage is within 0.1 V of the measurement at the battery. Go to Test Step 6.
NOT OK - The voltage varies from the measurement at the battery by more that 0.1 V.
Repair: There is a problem with the -battery circuit. Repair the wiring harness or replace the wiring harness.
STOP.
- CHECK THE VOLTAGE AT THE ECM.
Use a multimeter to measure the voltage from the +battery contacts to the -battery contacts at the J1 harness connector for the ECM.
Expected Result: The voltage is 11 to 14 VDC for a 12 VDC system or 22 to 28 VDC for a 24 VDC system.
Results:
OK - The voltage is 11 to 14 VDC for a 12 VDC system or 22 to 28 VDC for a 24 VDC system. Go to Test Step 7.
NOT OK - The voltage is NOT 11 to 14 VDC for a 12 VDC system or 22 to 28 VDC for a 24 VDC system.
Repair: There is a problem with the wiring harness from the MJB to the ECM. Repair the wiring harness or replace the wiring harness. STOP.
- MEASURE THE VOLTAGE FROM THE KEYSWITCH.
Turn the keyswitch ON and measure the voltage at the keyswitch input on the ECM J1 connector.
Expected Result: The voltage is 11 to 14 VDC for a 12 VDC system or 22 to 28 VDC for a 24 VDC system.
Results:
OK - The voltage is 11 to 14 VDC for a 12 VDC system or 22 to 28 VDC for a 24 VDC system. Go to Test Step 8.
NOT OK - The voltage is NOT 11 to 14 VDC for a 12 VDC system or 22 to 28 VDC for a 24 VDC system.
Repair: There is a problem with the wiring harness from the keyswitch to the ECM. Repair the wiring harness or replace the wiring harness.
STOP.
- CHECK USING CATERPILLAR ELECTRONIC TECHNICIAN.
- Disconnect the ECM/Throttle cable from the PCP.
- Turn the key switch to the ON position.
- Connect Cat ET to the engine and go to the screen to monitor the switch inputs.
- Use a jumper wire to connect the following contacts temporarily.
Show/hide table
Table 1 Contact Number Circuit Name Contact Number Pin 6 Secondary Throttle Select Pin 4 (−Battery) Pin 8 Slow Vessel Mode Pin 4 (−Battery) - Monitor the Cat ET screen as the jumper wire is connected and removed. The switch inputs should all be OFF until the jumper is connected. Then, the state changes to ON. Wiggle the harness when the contacts are connected in order to reveal an intermittent condition.
Expected Result: The state for all switches is OFF and then ON as the jumper is connected.
Results:
OK - The state for all switches is OFF and then ON as the jumper is connected. Go to Test Step 8.a.
NOT OK - The state for all switches not OFF without the jumper installed, or a switch does not change to ON as the jumper is connected.
Repair: There is a problem with the wiring harness. Repair the wiring harness or replace the wiring harness. STOP.
- CHECK THE BUTTON PANEL.
If the suspect control head is an ICH temporarily replace the ICH, and retest. If the suspect control station is a Slimline Control Head, continue with this test.
- Disconnect the cable between the CSP and the Button Panel.
- Insert a 12-pin breakout T between the CSP and the Button Panel Connector.
- Use a multimeter to measure the voltage to verify Button Panel operation. Refer to the chart below for the proper voltage levels.
Show/hide table
Table 2 Contact Number Circuit Name Measure To Pin 7 Station Active Switch Pin 12 Pin 8 Slow Vessel Mode Pin 12 Pin 9 Synch Switch Pin 12 Pin 10 Troll Switch Pin 12 Pin 11 Neutral Lockout Pin 12 Expected Result: The voltage level should be greater than 3.75 VDC when the switch button is not pressed and below 2.5 VDC while the button is pressed.
Results:
OK - The voltages are within the limits defined in the chart. Replace the PCP. STOP.
NOT OK - The voltages are NOT within the limits defined in the chart.
Repair: Replace the button panel
STOP.