993685 Volvo.Penta Gasket

Illustration 1 g01280096
Schematic diagram for the oxygen sensorThe engine is equipped with a remote control panel that includes a status control module and air/fuel ratio control.
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Schematic diagram for the oxygen sensorThe engine is configured for Canadian Standards Association (CSA). The engine is equipped with an optional remote control panel with air/fuel ratio control.Test Step 1. Inspect the Electrical Connectors and the Wiring
Set the engine control to the OFF/RESET mode. Remove the electrical power from the engine.Note: For the following steps, refer to Troubleshooting, "Inspecting Electrical Connectors".
Thoroughly inspect each of the following connectors:
Connectors for the oxygen sensor
Connectors for the oxygen buffer
J1/P1 connectors
Connections for the oxygen relay
Illustration 3 g01046823
Harness side of the P2 and P1 connectors (P2-20) "Relay Driver" output (P1-5) Oxygen signal
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the oxygen sensing system.
Check the harnesses and the wiring between the components for abrasion and for pinch points. Check the harnesses and the wiring for abrasion and for pinch points between the oxygen buffer and the ECM.Expected Result:The connectors, pins, and sockets are connected properly. The connectors and the wiring do not have corrosion, abrasion, or pinch points.Results:
OK - The components are in good condition with proper connections. Proceed to Test Step 2.
Not OK - 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.STOPTest Step 2. Check for a Diagnostic Code
Connect an electronic service tool to a service tool connector.
Restore the electrical power to the engine. Set the engine control to the STOP mode.
Clear any diagnostic codes.
If the original code was generated during an oxygen calibration, start the oxygen calibration again.
If the original code was generated during engine operation, start the engine. Attempt to repeat the condition that generated the code. Run the engine to full operating temperature, if necessary.
Look for the following diagnostic codes:
550-02 Noisy or Loss of Oxygen Signal
551-01 Oxygen Sensor not connected to buffer
554-11 Oxygen Signal missing during O2 calibration step
555-02 Noisy Oxygen signalExpected Result:None of the above codes are activated.Results:
No codes - There are no codes for the oxygen sensing system.Repair: The problem was probably caused by a poor electrical connection.STOP
550-02 Code - Proceed to Test Step 3.
551-01 Code - Proceed to Test Step 13.
554-11 Code - Proceed to Test Step 3.
555-02 Code - Proceed to Test Step 3.Test Step 3. Check for a PWM Signal at the ECM
Use a multimeter that is capable of measuring the duty cycle of a signal. Connect the negative lead of the multimeter to ground. Use a 7X-1710 Multimeter Probe in order to connect the positive lead to terminal P1-5.
Turn on the oxygen sensing system by one of the following methods.
If you are using the DDT, press the "MODE" key until the "O2/TEST MENU" is displayed. Press the "FUNC" key until "OXYGEN POWER" is displayed. Press the "ALT1" key. Then press the "ENTER" key.
If you are not using a DDT, start the engine.
Measure the duty cycle of the oxygen signal.Expected Result:The duty cycle is between 30 and 80 percent.Results:
OK - The duty cycle of the signal is within the specified range. However, there is a diagnostic code for the oxygen sensing system.Repair: Replace the ECM. Refer to Troubleshooting, "Replacing the ECM".STOP
Not OK - The duty cycle is between 10 and 20 percent.Repair: Verify that the oxygen sensor is connected to the oxygen buffer. Proceed to Test Step 13 if the problem is not resolved.
Not OK - The duty cycle is zero.Repair: If you are using a DDT in order to turn on the oxygen sensing system, do not turn off the oxygen sensing system. If the engine is running, do not shut off the engine. Proceed to Test Step 4.Test Step 4. Check the Operating Voltage at the Buffer's Electrical ConnectorNote: This Test Step may generate additional diagnostic codes. Ignore the additional codes and clear the codes when this procedure is complete.
Disconnect the 3-pin connector for the oxygen buffer.
Measure the voltage between terminals A and B on the harness connector for the buffer.Expected Result:The voltage is approximately equal to the battery voltage.Results:
OK - The operating voltage at the buffer's electrical connector is correct. Reconnect the buffer's 3-pin connector.Repa