841788 Volvo.Penta Air outlet

Illustration 1 g00794693
SchematicTest Step 1. Inspect Electrical Connectors and Wiring
Turn the keyswitch to the OFF/RESET position.
Thoroughly inspect the J1/P1 ECM connector, the J2/P2 ECM connector, the J3/P3 machine connector, and all other connectors in the wiring harness. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.Expected Result:All connectors, pins, and sockets should be completely inserted and coupled. The harness and wiring should be free of corrosion, abrasion, and pinch points. All connections and grounds should be tight and free of corrosion.Results:
OK - Proceed to Test Step 2.
Not OK - Repair: Repair the circuit.Verify that the repair eliminates the problem. Stop.Test Step 2. Determine the Type of Sensor that is SuspectDetermine whether the suspect sensor is an analog sensor (+5 VDC) or a digital sensor (+8 VDC). Refer to Illustration 1.Results:
Analog (+5V) - Proceed to Test Step 3.
Digital (+8V) - Proceed to Test Step 7.Test Step 3. Check the Analog Sensor Supply Voltage at the Sensor Connector
Disconnect the suspect sensor.
Turn the keyswitch to the ON position.
Use a multimeter to measure the voltage across terminal A (+5V Analog) and terminal B (Analog Return) at the harness side of the suspect sensor connector.
Turn the keyswitch to the OFF/RESET position.Expected Result:The analog sensor supply voltage should be 5.0 0.5 VDC.Results:
OK - The supply voltage is reaching the sensor. Proceed to Test Step 4.
Not OK - The analog sensor supply voltage is not reaching the sensor.Repair: Refer to Troubleshooting, "Analog Sensor Supply Circuit - Test" for the appropriate troubleshooting procedure. Stop.Test Step 4. Short the Sensor Signal at the Sensor Connector
Turn the keyswitch to the OFF/RESET position.
Connect ET to the service tool connector.
Disconnect the suspect sensor from the harness.
Turn the keyswitch to the ON position.
Check the active diagnostic codes on ET.Note: A diagnostic code with a FMI of "03" (Open/Short to +Battery) should be active for the disconnected sensor.
Use a suitable piece of wire to short terminal B (Analog Return) and terminal C (Signal) at the harness side of the suspect sensor connector.
Check the active diagnostic codes on ET.Note: The diagnostic code should change to a "04" (Short to Ground) when the terminals are shorted.Expected Result:The FMI for the active diagnostic code should be "03" (Open/Short to +Battery) when the sensor is disconnected. The FMI should change to a "04" (Short to Ground) when the terminals are shorted.Results:
OK - The harness appears to be OK. The problem is with the sensor.Repair: Replace the suspect sensor.Verify that the repair eliminates the problem. Stop.
Not OK - Proceed to Test Step 5.Test Step 5. Measure the Resistance of the Signal Wire
Illustration 2 g00755693
P2 ECM connector
Disconnect the suspect sensor and the J2/P2 ECM connector.
Measure the resistance between terminal C (Signal) at the harness side of the suspect sensor connector and the appropriate terminal for the sensor signal at the P2 ECM connector.Expected Result:The resistance through the signal wire should be less than 10 Ohms.Results:
OK - Proceed to Test Step 6.
Not OK - There is an open circuit or excessive resistance in the signal circuit of the harness.Repair: Repair the circuit.Verify that the repair eliminates the problem. Stop.Test Step 6. Short the Sensor Signal at the ECM
Illustration 3 g00751433
J2/P2 breakout
Turn the keyswitch to the OFF/RESET position.
Remove the suspect signal wire from the J2/P2 ECM connector.
Install a 7X-1715 Adapter Cables (40 Pin Breakout) at the J2/P2 ECM connector.
Turn the keyswitch to the ON position.
Check the active diagnostic codes on ET.Note: A diagnostic code with a FMI of "03" (Open/Short to +Battery) should be active for the sensor with the disconnected signal wire.
Use a suitable piece of wire to short the terminal for the suspect sensor signal to P2:30 (Analog Sensor Return) at the breakout.
Check the active diagnostic codes on ET.Note: The diagnostic code should change to a "04" (Short to Ground) when the signal wire is shorted.Expected Result:The FMI for the active diagnostic code should change from a "03" (Open/Short to +Battery) to a "04" (Short to Ground) when the terminals are shorted.Results:
OK - There is a problem in the wiring between the suspect sensor and the ECM.Repair: Repair the circuit.Verify that the repair eliminates the problem. Stop.
Not OK - The ECM is not reading the sensor circuit.Repair: Verify your results before replacing the ECM. Refer to Troubleshooting, "Replacing the ECM" before you replace the ECM.Verify that the repair eliminates the problem. Stop.Test Step 7. Check the Sensor Supply Voltage at the Sensor Connector
Disconnect the suspect sensor.
Turn the keyswitch to the ON position.
Use a multimeter to measure the voltage across terminal A (+8V Digital) and terminal B (Digital Return) at the harness side of the suspect sensor connector.
Turn the keyswitch to the OFF/RESET position.Expected Result:The digital sensor supply voltage should be 8.0 0.5 VDC.Results:
OK - The supply voltage is reaching the sensor. Proceed to Test Step 8.
Not OK - The digital sensor supply voltage is not reaching the sensor.Repair: Refer to Troubleshooting, "Digital Sensor Supply Circuit - Test" for the appropriate troubleshooting procedure. Stop.Test Step 8. Check the Signal Wire for an Open
Illustration 4 g00794975
P1 ECM connector