3868160 Volvo.Penta Drive

Table 1
Diagnostic Trouble Codes
CDL Code and Description Comments
1440-9
Throttle Actuator : Abnormal Update Rate The ECM cannot communicate with the throttle actuator. The code is logged and the engine is shut down.
1440-11
Throttle Actuator invalid The code is logged and alarm output is activated. The engine is shut down.
1440-12
Throttle Actuator : Failure The throttle actuator has reported that an internal fault has occurred.
The code is logged and alarm output is activated. The engine is shut down. Logged diagnostic codes provide a historical record. Before you begin this procedure, use Cat® Electronic Technician (ET) to print the logged codes to a file.
Illustration 1 g01325969
Schematic for the circuit of the throttle actuator
Note: For serial prefixes HPY, ; HCY, ; L4M, and ; GXW refer to Schematic , M0108531 for wiring information.Test Step 1. RECOMMENDED ACTIONS
Illustration 2 g01234707
Locations for the voltage check at the junction box
Illustration 3 g01233703
Locations for the voltage check at the harness connector
Table 2
Troubleshooting Test Steps Value Results
1. Inspect the Electrical Connectors and Wiring
A. Remove the electrical power from the engine.
B. Thoroughly inspect each of the following connectors:
- J1/P1 connectors
- J9/P9 connectors
- Connectors on the throttle actuator
C. Check the torque of the allen head screw for the ECM connectors.
D. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the throttle actuator.
E. Check the wiring for abrasion and for pinch points from the throttle actuator to the ECM.
Electrical Connectors and Wiring
Results: The components are in good condition with proper connections.
Proceed to Test Step 2.
Result: The components are not in good condition and/or at least one connection is improper.
Repair: Perform the necessary repairs and/or replace parts, if necessary. Ensure that all the seals are properly installed. Ensure that the connectors are properly engaged. Verify that the repair has eliminated the original problem.
Return the unit to service.
2. Check for Codes
A. Connect Cat ET to the service tool connector on the terminal box.
B. Switch the 35 amp circuit breaker ON. Set the engine control to the STOP mode.
C. Use Cat ET to determine if one of the diagnostic codes from the table above is active.
Codes
Result: None of the diagnostic codes are active. The communication between the ECM and the throttle actuator appears to be OK currently.
Repair: If you are troubleshooting an intermittent problem, refer to Troubleshooting, "Electrical Connectors - Inspect".
Terminating resistors must be connected to each end of the CAN data link. The terminating resistors improve the communication between the devices. If there is an intermittent diagnostic code for any of the devices that are connected to the CAN data link, be sure to check the terminating resistor that is inside the terminal box. Also check the jumper wire that is connected between terminals "J" and "K" on the actuator for the bypass valve. Make repairs, when possible. Replace parts, if necessary.
Result: There is an active 1440-9 code.
Proceed to Test Step 3.
Result: There is an active 1440-11 code. There is a problem with the linkage of the throttle actuator.
Repair: Set the engine control to the OFF/RESET position. Remove the electrical power from the engine. Move the throttle plate through the entire range of travel while you feel the motion. If the motion is sticky and/or rough, investigate the cause of the binding. Perform the necessary repairs.
Result: There is an active 1440-12 code. The controller for the throttle actuator has detected an internal fault.
Repair: Replace the actuator. Verify that the repair has eliminated the original problem.
3. Check for Electrical Power at the Actuator
A. Refer to Illustration 2. Measure the battery voltage at the junction box.
B. Disconnect the electrical connector from the actuator.
C. Measure the voltage between terminals "N" and "P" at the harness connector.
The voltage at the harness connector is within 2 volts of the voltage at the junction box.
Result: The voltage at the harness connector is within 2 volts of the voltage at the junction box. The actuator is receiving the proper operating voltage.
Proceed to Test Step 4.
Result: The voltage at the harness connector is not within 2 volts of the voltage at the junction box. The actuator is not receiving the proper operating voltage.
Repair: Determine the cause of the excessive voltage drop. Make the necessary repairs.
4. Check the CAN Data Link for Continuity Between the Throttle Actuator and the ECM
A. Set the engine control to the OFF/RESET mode. Switch the 35 amp circuit breaker OFF.
B. Disconnect the P1 connector. Disconnect the connector for the throttle actuator.
C. Use a multimeter to check for continuity between the points that are listed below. During each measurement, wiggle the harnesses to check for an intermittent problem with the harness. Be sure to wiggle the harness near each of the connectors. Be sure to wiggle the harness near the fuel metering valve.
- P1-34 to Terminal C (CAN data link-)
-P1-50 to Terminal A (CAN data link+)
- P1-42 to Terminal M (CAN shield)
The continuity of the circuits between the terminals is good.
Result: The continuity of the circuits between the terminals is good.
Proceed to Test Step 5.
Result: At least one of the continuity checks indicates an open circuit. There is an open circuit for the CAN data link between the throttle actuator and the ECM.
The open circuit could be caused by a poor electrical connection in a connector. Alternatively, the open circuit could be caused by one of the following components:
- The harness inside the terminal box
- The harness between the terminal box and the fuel metering valve
- The harness between the fuel metering valve and the throttle actuator
- The fuel metering valve
Repair: Make repairs or replace parts as necessary.
5. Check the CAN Data Link for a Short Circuit
A. Verify that the engine control is in the OFF/RESET mode and that the 35 amp circuit breaker is OFF.
B. Use a multimeter to check for continuity between the points that are listed below. During each measurement, wiggle the harnesses to check for an intermittent problem.
- P1-34 (CAN data link-) to P1-50 (CAN data link+)
- P1-34 (CAN data link-) to P1-42 (CAN shield)
- P1-34 (CAN data link-) to P1-52 (+Battery)
- P1-50 (CAN data link +) to P1-42 (CAN