861978 Volvo.Penta Washer

Table 1
Diagnostic Trouble Codes for the Fuel Rack Solenoid Position Sensor
J1939 Code Description Notes
733-3 Engine Rack Position Sensor : Voltage Above Normal The Electronic Control Module (ECM) detects the following conditions:
The signal voltage from the fuel rack solenoid position sensor is greater than 4.5 VDC for at least 1 second.
The keyswitch is ON for at least 2 seconds.
The warning lamp will flash. The shutdown lamp will come on.
The engine will shut down. The engine will not restart.
733-4 Engine Rack Position Sensor : Voltage Below Normal The ECM detects the following conditions:
The signal voltage from the fuel rack solenoid position sensor is less than 0.5 VDC for at least 2 seconds.
The keyswitch is ON for at least 2 seconds.
The warning lamp will flash. The shutdown lamp will come on.
The engine will shut down. The engine will not restart. The position sensor is an integral part of the fuel rack solenoid. If the following procedure indicates a fault with the position sensor, then the entire solenoid must be replaced.The following background information is related to this procedure:The ECM supplies 5 VDC to terminal "B" of the fuel rack solenoid position sensor connector. The sensor common from the ECM connector goes to terminal "A" of the fuel rack solenoid position sensor connector. The sensor supply is output short circuit protected. A short circuit to the battery will not damage the circuit inside the ECM. The signal voltage from terminal "C" of the fuel rack solenoid position sensor connector is supplied to P2:49 on the ECM connector.
Illustration 1 g03330725
Schematic for the fuel rack position sensor
Illustration 2 g03330798
Typical view of the pin locations on the P2 connector for the position sensors
(48) Fuel rack solenoid position sensor ground
(49) Fuel rack solenoid position sensor 5 VDC supply
(50) Fuel rack solenoid position sensor signal
Illustration 3 g03330886
View of the harness connector for the fuel rack solenoid position sensor
(A) Fuel rack position sensor ground
(B) Fuel rack position sensor 5 VDC supply
(C) Fuel rack solenoid position sensor signal Test Step 1. Verify All Active and Recently Logged Diagnostic Codes
Turn the keyswitch to the ON position. Wait at least 10 seconds for activation of the diagnostic codes.
Verify if any of the diagnostic codes that are listed in Table 1 are active or recently logged. Results:
One or more of the preceding diagnostic codes are active or recently logged. - Proceed to Test Step 2.
None of the preceding diagnostic codes are active or recently logged. - Repair: The fault may be intermittent. Refer to Troubleshooting, "Electrical Connectors - Inspect" in order to identify intermittent faults.STOPTest Step 2. Inspect Electrical Connectors And Wiring
Thoroughly inspect the terminal connections on the P2/J2 ECM connectors.
Thoroughly inspect the connector for the fuel rack solenoid position sensor.
Refer to Troubleshooting, "Electrical Connectors - Inspect".
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the fuel rack solenoid position sensor.
Check the harness for abrasions and for pinch points from the fuel rack solenoid position sensor back to the ECM. Expected Result:All connectors, pins, and sockets are correctly connected. The harness should be free of corrosion, abrasions, and pinch points.Results:
OK - Proceed to Test Step 3.
Not OK - Repair: Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all of the seals are correctly in place and ensure that the connectors are correctly connected.Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair eliminates the fault.STOPTest Step 3. Measure the Supply Voltage at the Sensor Connector
Turn the keyswitch to the OFF position.
Disconnect the fuel rack solenoid position sensor from the harness.
Turn the keyswitch to the ON position.
Measure the voltage between terminal A and terminal B on the harness connector for the sensor.
Reconnect the sensor to the harness. Expected Result:The measured voltage is 4.9 to 5.1 VDC.Results:
OK - The sensor supply voltage is correct. Proceed to Test Step 5.
The sensor supply voltage is out of the nominal range. - Proceed to Test Step 4.Test Step 4. Measure the Supply Voltage at the ECM
Turn the keyswitch to the OFF position.
Disconnect the P2 connector from the ECM.
Turn the keyswitch to the ON position.
Use a suitable multimeter to measure the voltage between J2:48 and J2:50
Turn the keyswitch to the OFF position.
Reconnect the P2 connector. Expected Result:The voltage measures 4.9 to 5.1 VDC.Results:
OK - The voltage is within the expected range. The fault is in the 5 VDC supply wire or the ground wire between the sensor connector and the P2 connector.Repair: Replace the faulty wiring.Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.STOP
Not OK - The voltage is not within the expected range.Repair: Perform the following repair:
Make sure that the latest flash file for the application is installed in the ECM. Refer to Troubleshooting, "Flash Programming".
Contact the Technical Communicator at a Caterpillar dealer. Note: This consultation can greatly reduce the repair time.
If the Technical Communicator recommends the use of a replacement ECM, install a replacement ECM. Refer to Troubleshooting, "Replacing the ECM".
Use the electronic service tool to recheck the system for active diagnostic codes.
If the fault is resolved with the replacement ECM, reconnect the suspect ECM.
If the fault returns with the suspect ECM, replace the ECM.
Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair eliminates the fault. STOPTest Step 5. Verify the Type of Active Diagnostic Code
Turn the keyswitch to the ON position. Wait at least 10 seconds for activation of the diagnostic codes.
Use the electronic service tool to check for active diagnostic codes. Record all active diagnostic codes. Expected Result:One of the diagnostic codes that are listed in Table 1 is active.Results:
Short Circuit - A 733-4 diagnostic code is active at this time. Proceed to Test Step 6.
Open Circuit or short to ground - A 733-3 diagnostic code is active at this time. Proceed to Test Step 8.
A short circuit diagnostic code is not active. An open circuit diagnostic code is