20459265 Volvo.Penta Washer

Illustration 1 g00760062
SchematicTest Step 1. Inspect Electrical Connectors and Wiring
Turn the keyswitch to the OFF/RESET position.
Thoroughly inspect the J1/P1 ECM connector, the J3/P3 machine connector, and the J90/P90 decelerator position sensor connector. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector and the sensor connectors that are associated with the active diagnostic code.
Check the ECM connector (allen head screw) for the proper torque of 6.0 N m (55 lb in).Expected Result:All connectors, pins, and sockets are completely inserted and coupled. The harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - All connectors, pins, and sockets are completely inserted and coupled. The harness and wiring are free of corrosion, of abrasion, and of pinch points. Proceed to Test Step 2.
Not OK - There is a problem with the harness and/or wiring.Repair: Repair the circuit.Verify that the repair eliminates the problem. Stop.Test Step 2. Inspect the Decelerator Pedal Assembly
Inspect the decelerator pedal assembly for components that are loose, bent, missing, or worn.
Slowly depress the pedal and release the pedal.Expected Result:The decelerator pedal assembly operates smoothly without excessive drag. The pedal returns to the low idle position without assistance in less than one second.Results:
OK - The decelerator pedal assembly functions properly. Proceed to Test Step 3.
Not OK - There is a problem with the decelerator pedal assembly.Repair: Repair the decelerator pedal assembly, as required. Stop.Test Step 3. Check the Status on Caterpillar Electronic Technician (ET)
Connect Cat ET to the service tool connector.
Turn the keyswitch to the ON position.
Observe the status for "Decelerator Position" on Cat ET while you operate the decelerator pedal.Expected Result:The status is approximately 0 percent when the decelerator pedal is released. The status progressively increases to 100 percent when the decelerator pedal is fully depressed.Note: This range can change depending on the adjustment of the decelerator pedal assembly.Results:
OK - The decelerator position sensor is working properly.Repair: Refer to Troubleshooting, "Electrical Connectors - Inspect" if the problem is intermittent. Stop.
Not OK - The decelerator position sensor is not working properly. Proceed to Test Step 4.Test Step 4. Check the Supply Voltage at the Sensor
Turn the keyswitch to the OFF/RESET position.
Install a 7X-6370 Adapter Cable (3 Pin DT Breakout) at the J90/P90 decelerator position sensor connector.
Turn the keyswitch to the ON position.
Measure the voltage across terminal A (digital sensor +8 VDC) and terminal B (digital return) at the J90/P90 breakout.Expected Result:The supply voltage is 8.0 0.4 VDC.Results:
OK - The sensor is receiving the correct supply voltage. Proceed to Test Step 5.
Not OK - The sensor is not receiving the correct supply voltage. Proceed to Test Step 10.Test Step 5. Check the Isolated Signal Frequency and the Duty Cycle at the Sensor
Turn the keyswitch to the OFF/RESET position.
Remove the wire from the harness side of P90:C (signal).
Turn the keyswitch to the ON position.
Measure the frequency and the duty cycle between terminal B (digital return) and terminal C (signal) at the J90/P90 breakout while you operate the decelerator pedal.
Turn the keyswitch to the OFF/RESET position.
Reinstall the wire in P90:C (signal).Expected Result:The frequency is between 150 Hz and 1000 Hz. The duty cycle is approximately 57 percent when the pedal is released. The duty cycle is approximately 32 percent when the pedal is fully depressed.Results:
OK - The sensor is producing a valid signal. Proceed to Test Step 6.
Not OK - The sensor is not producing a valid signal.Repair: Replace the decelerator position sensor.Verify that the repair eliminates the problem. Stop.Test Step 6. Check for a Short Circuit in the Wiring Harness
Disconnect the J1/P1 ECM connector, the J2/P2 ECM connector, and the J90/P90 decelerator position sensor connector.
Measure the following resistances:
P90:A (digital sensor +8 VDC) to P90:B (digital return)
P90:A (digital sensor +8 VDC) to P90:C (decelerator position)
P90:B (digital return) to P90:C (decelerator position)Expected Result:The resistance is greater than 20,000 Ohms for each measurement.Results:
OK - The resistance is acceptable. There are no shorts in the harness. Proceed to Test Step 7.
Not OK - The resistance is not acceptable. There is a short circuit in the harness or connectors.Repair: Repair the circuit.Verify that the repair eliminates the problem. Stop.Test Step 7. Check the Resistance through the Harness
Illustration 2 g00738799
P1 ECM connector
Illustration 3 g00936505
ECM connector P2
Fabricate a jumper wire with pins at both ends.
Use the jumper wire to short P90:A (digital sensor +8 VDC) and P90:C (decelerator position) together.
Measure the resistance between P2:31 (decelerator position) and P1:35 (digital sensor +8 VDC).
Move the one end of the jumper wire from P90:A (digital sensor +8 VDC) to P90:B (digital return). Leave the other end in P90:C (decelerator position) together.
Measure the resistance between P2:31 (decelerator position) and P1:29 (digital return).
Remove the jumper wire and reconnect all of the connectors.Expected Result:The resistance is less than 10 Ohms for each measurement.Results:
OK - The resistance is acceptable. The harness is good. Proceed to Test Step 8.
Not OK - The resistance is not acceptable. There is an open circuit or excessive resistance in the harness or the connectors.Repair: Repair the circuit.Verify that the repair eliminates the problem. Stop.Test Step 8. Check the Signal Frequency and the Duty Cycle at the ECM
Illustration 4 g00738799
J1/P1 breakout
Illustration 5 g00936505
J2/P2 breakout