0390397 EVINRUDE CARB ASSY.,Upper,115

The oxygen sensor is used to monitor the oxygen in the engine exhaust. The ECM utilizes the signal from the oxygen sensor to ensure that the engine burns the fuel efficiently and reduces excessive build-up of soot in the Diesel Particulate Filter (DPF).The oxygen sensor generates a voltage signal that is directly proportional to the concentration of oxygen. This voltage signal cannot be measured accurately with a multimeter. The signal can only be interpreted correctly by the software that is contained in the ECM.A heater circuit within the oxygen sensor ensures that a build-up of condensation does not damage the sensor.
Illustration 1 g03617457
Schematic diagram for the oxygen sensor
Not all connectors are shown. Refer to the Electrical Schematic for the application.
Illustration 2 g02724356
View of the pin locations on the P1 connector for the oxygen sensor
(7) Sensor heating ground
(63) Voltage signal
(64) Current pump
(85) Virtual ground
(86) Current adjust
Illustration 3 g03114187
View of the pin locations on the harness connector for the oxygen sensor (view from the front)
(1) Current pump
(2) Virtual ground
(3) Sensor heating ground
(4) Sensor heating power supply (switched battery +)
(5) Current adjust
(6) Voltage signal
Table 2
Troubleshooting Test Steps Values Results
1. Check for Active or Recently Logged Diagnostic Codes
A. Turn the keyswitch to the OFF position.
B. Connect the electronic service tool to the diagnostic connector.
C. Turn the keyswitch to the ON position. If the engine will start, run the engine for 15 minutes or until one of the diagnostic codes listed in Table 1 is active.
D. Use the electronic service tool to check for active or recently logged diagnostic codes.
E. Turn the keyswitch to the OFF position.
Diagnostic codes
Result: There are other active or recently logged diagnostic codes that are not listed in this procedure.
Troubleshoot all other diagnostic codes before returning to this procedure. Refer to Troubleshooting, "Diagnostic Trouble Codes"
Result: Only diagnostic codes that are listed in this procedure are active or recently logged.
Proceed to Test Step 2.
2. Inspect Electrical Connectors And Wiring
A. Check the fuses.
B. Thoroughly inspect the connector for the oxygen sensor. Refer to Troubleshooting, "Electrical Connectors - Inspect".
C. Thoroughly inspect the P1/J1 ECM connector. Refer to Troubleshooting, "Electrical Connectors - Inspect".
D. Perform a 30 N (6.7 lb) pull test on each of the wires in the connectors that are associated with the oxygen sensor.
E. Check the harness for abrasions and for pinch points from the oxygen sensor back to the ECM and from the oxygen sensor to the battery supply.
Damaged wire or connector
Result: A damaged wire or damaged connector was found. A fuse is blown.
Repair the damaged wire or the damaged connector. Replace any blown fuses
Use the electronic service tool in order to clear all logged diagnostic codes. Run the engine for at least 15 minutes and check for active diagnostic codes to ensure that the repair eliminates the fault.
Result: All connectors, pins, and sockets are correctly connected and/or inserted and the harness is free of corrosion, of abrasion or of pinch points.
Proceed to Test Step 3.
3. Check for Active or Recently Logged Diagnostic Codes
A. Turn the keyswitch to the ON position. If the engine will start, run the engine for 15 minutes.
B. Use the electronic service tool to check for active diagnostic codes.
C. Turn the keyswitch to the OFF position.
Diagnostic codes
Result: One of the following diagnostic codes is active or recently logged:
3217-5
3217-6
3217-13
3217-15
3222-3
3222-4
3222-5
Proceed to Test Step 4.
Result: One of the following diagnostic codes is active or recently logged:
3217-3
3217-4
3219-15
3219-17
Proceed to Test Step 7.
Result: A 3217-12 diagnostic code is active or recently logged.
Proceed to Test Step 10.
4. Check the Voltage to the Oxygen Sensor Heater
A. Turn the keyswitch to the OFF position.
B. Disconnect the oxygen sensor.
C. Turn the keyswitch to the ON position.
D. Use a suitable multimeter to measure the voltage between pin 4 on the harness connector for the oxygen sensor and a suitable ground.
E. Turn the keyswitch to the OFF position.
10 V to 14 V
Result: The measured voltage is not within the expected range.
The fault is in the 12 V power supply wiring to the oxygen sensor.
Check all the wiri