984133 Volvo.Penta Attaching clamp

Table 1
J1939 Codes and Description    CDL Codes and Description    Comment    
678-3
ECU 8 Volts DC Supply : Voltage Above Normal     41-3
8 Volt DC Supply : Voltage Above Normal     The code is logged.
All sensors are set to default values.    
678-4
ECU 8 Volts DC Supply : Voltage Below Normal     41-4
8 Volt DC Supply : Voltage Below Normal     The code is logged.
All sensors are set to default values.    
3509-3
Sensor Supply Voltage 1 : Voltage Above Normal     262-3
5 Volt Sensor DC Power Supply : Voltage Above Normal     The code is logged.
All sensors are set to default values.    
3509-4
Sensor Supply Voltage 1 : Voltage Below Normal     262-4
5 Volt Sensor DC Power Supply : Voltage Below Normal     The code is logged.
All sensors are set to default values.    
3510-3
Sensor Supply Voltage 2 : Voltage Above Normal     2131-3
5 Volt Sensor DC Power Supply #2 : Voltage Above Normal     The code is logged.
Engine power may be derated.    
3510-4
Sensor Supply Voltage 2 : Voltage Below Normal     2131-4
5 Volt Sensor DC Power Supply #2 : Voltage Below Normal     The code is logged.
Engine power may be derated.    Note: The 262 diagnostic codes indicate a problem with the 5 V power supply on the J2 ECM connector. The 2131 diagnostic codes indicate a problem with the 5 V power supply on the J1 ECM connector.System OperationThe Electronic Control Module (ECM) supplies a regulated voltage of 5.0 0.2 VDC to the following sensors:
Fuel pressure sensor
Engine oil pressure sensor
Atmospheric pressure sensor
Turbocharger inlet pressure sensor
Intake manifold pressure sensor
Crankcase pressure sensorThe ECM supplies a regulated voltage of 8.0 0.4 VDC to the following sensor:
Sensor for the left turbocharger turbine inlet temperature
Sensor for the right turbocharger turbine inlet temperatureThe supply voltage for the sensors is routed from the ECM to terminal A of each sensor connector. The sensor return for the sensors is routed from the ECM to terminal B of each sensor connector. The ECM provides short circuit protection for the internal power supply. A short circuit to the battery will not damage the internal power supply.Note: The sensors are not protected from overvoltage. A short from the supply line to the +Battery may damage the sensors. If any of the 3 diagnostic codes are active, it is possible that a sensor has been damaged. Repair the sensor supply and check for any active sensor diagnostic codes in order to determine if a sensor has failed.
Illustration 1 g02722071
Typical schematic
Illustration 2 g03680951
Typical schematic for the +8V supply sensors
Table 2
Troubleshooting Test Steps    Values    Results    
1. Inspect the Electrical Connectors and the Wiring
A. Turn the main disconnect switch to the OFF position.
B. Thoroughly inspect connectors (1) through (7). Inspect all of the connectors that are associated with the circuit. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
C. Perform a
45 N (10 lb) pull test on each of the wires in the ECM connectors that are associated with the circuit.
D. Check the allen head screw for each of the ECM connectors for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
E. Check the harness and wiring for abrasion and for pinch points from the sensors back to the ECM.
   
Connectors    
Results: The harness and connectors appear to be OK.
Proceed to Test Step 2
Results: There is a problem with the connectors and/or wiring.
Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are coupled.
Verify that the repair eliminates the problem.
   
2. Check for Diagnostic Codes that are Active or Logged
A. Connect Caterpillar Electronic Technician (ET) to the service tool connector.
B. Restore the electrical power to the ECM.
C. Monitor the active diagnostic code screen on Cat ET. Check and record any diagnostic codes that are active or logged. Look for the following diagnostic codes:
-3509-3
-3509-4
-3510-3
-3510-4
Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
D. Turn the main disconnect switch to the OFF position.
   
Codes    
Results: No diagnostic codes are active or logged.
Repair: There does not appear to be an electrical problem with the sensor supply at this time. If the problem is intermittent, refer to Troubleshooting, "Electrical Connectors - Inspect".
Results: Either the 41-3 or 41-4 diagnostic code is active or logged at this time.
There is an electrical problem with the digital sensor supply.
Proceed to Test Step 6
Results: Either the 3509-3, 3509-4, 3510-3, or 3510-4 diagnostic code is active or logged at this time.
There is an electrical problem with the analog sensor supply.
Proceed to Test Step 3
   
3. Check the Supply Voltage at the Sensor Connector
A. Disconnect the harness connectors for the following sensors:
- Crankcase pressure sensor
- Fuel pressure sensor
- Atmospheric pressure sensor
- Intake manifold pressure sensor
B. Restore the electrical power to the appropriate ECM.
Note: Be sure to wiggle the harness during the following measurements in order to reveal an intermittent condition.
C. Measure the voltage between terminals 1 and 2 at the appropriate sensor connector.
D. Turn the main disconnect switch to the OFF position.
E. Connect all of the sensors.
   
5.0 0.2 VDC    
Results: Each voltage measurement is 5.0 0.2 VDC.
Repair: The analog supply is reaching the sensor connector. There may be a problem with the sensor. Perform the following procedure:
1. Clear all diagnostic codes.
2. Run the engine. Allow the engine to warm up. Check if the code has been logged again.
If the code becomes active or logged, the sensor is faulty. Replace the sensor.
Verify that the repair eliminated the problem.
If the code does not become active or logged, there may be an intermittent problem in the harness or in a connector. If an intermittent problem is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct troubleshooting procedure.
Results: At least one voltage measurement is not 5.0 0.2 VDC. There is a problem with the harness wiring or with the ECM.
Proceed to Test Step 4
   
4. Disconnect the Analog Sensors While