4540 Mercury SCREW, BODY (IDLE TUBE)

Illustration 1 g00984736
Schematic
Illustration 2 g00984737
P2 ECM connectorTest Step 1. Disconnect the ECM Connector and Check for Active Diagnostic Codes
Turn the keyswitch to the OFF position.
Connect the electronic service tool to the service tool connector.
Disconnect the P2 ECM connector from the ECM.
Check the ECM connector for corrosion and moisture.
Turn the keyswitch to the ON position.
Check for active diagnostic codes on the electronic service tool.Note: An open circuit diagnostic code should be active for all of the engine sensors that are wired to the P2 ECM connector.Expected Result:The 5 volt diagnostic codes (262-03 and 262-04) are not active. An open circuit diagnostic code should be active for all of the engine sensors.Results:
OK - The 5 volt diagnostic codes are not active.Repair: Reconnect the P2 ECM connector. Proceed to Test Step 2.
Not OK - The 5 volt diagnostic codes are still active.Repair: Connect a test ECM.If the test ECM fixes the problem, reconnect the suspect ECM.If the problem returns, permanently install the new ECM.Verify that the repair eliminates the problem. Stop.Test Step 2. Disconnect the Sensors
Turn the keyswitch to the ON position.
Monitor the active diagnostic code screen on the electronic service tool while you disconnect the sensors one at a time. Wait for 30 seconds after each sensor is disconnected.Note: The 5 volt diagnostic code will become inactive if a sensor is the cause of the 5 volt diagnostic code.
Ensure that all of the sensors are disconnected.Expected Result:The 5 volt diagnostic code is still active when all of the sensors are disconnected.Results:
OK - The 5 volt diagnostic code is still active.Repair: Leave all of the sensors disconnected. Proceed to Test Step 4.
Not OK - The 5 volt diagnostic code disappears when the sensors are disconnected. Repair: Reconnect all of the sensors except the suspect sensor. Proceed to Test Step 3.Test Step 3. Check the Signal Wire
Turn the keyswitch to the ON position.Note: The suspect sensor should be disconnected.
Measure the voltage between terminal C (Signal) and terminal B (Analog Sensor Common) of the connector for the suspect sensor on the engine harness.Expected Result:The voltage should be less than 7.0 VDC.Results:
OK - The voltage is less than 7.0 VDC.Repair: Temporarily connect a new sensor.If the problem is resolved with the new sensor, reconnect the suspect sensor.If the problem returns, replace the suspect sensor.Verify that the repair eliminates the problem. Stop.
Not OK - The voltage is greater than 7.0 VDC.Repair: Inspect the signal wire for a short circuit to a voltage source.Repair the signal wire or replace the signal wire.Verify that the repair eliminates the problem. Stop.Test Step 4. Determine the Condition that is Present
Turn the keyswitch to the ON position.
Access the active diagnostic code screen on the electronic service tool.Expected Result:262-03 or 262-04 is active.Results:
262-03 - Proceed to Test Step 5.
262-04 - Proceed to Test Step 7.Test Step 5. Measure the 5 Volt Supply to the Sensor
Turn the keyswitch to the ON position.Note: All of the sensors should be disconnected.
Measure the voltage between terminal A (Analog Sensor Power +5V) and chassis ground for each sensor.Expected Result:The voltage should be 5.0 0.2 VDC.Results:
OK - The 5 volt supply is within the range. Proceed to Test Step 6.
Not OK - The voltage is greater than 5.2 volts.Repair: Check the 5 volt supply wire for a short to a higher voltage source.Repair the 5 volt supply wire or replace the 5 volt supply wire.Verify that the repair eliminates the problem. Stop.Test Step 6. Check the Common Wire
Turn the keyswitch to the ON position.
Measure the voltage between terminal A (Analog Sensor Power +5V) and terminal B (Analog Sensor Common) on all of the sensor connectors.
While you are monitoring the voltage, perform a 45 N (10 lb) pull test on P2:30 (Analog Sensor Common).Expected Result:The voltage should be 5.0 0.2 VDC.Results:
OK - The voltage is within the specified range.Repair: If the problem is intermittent, refer to Troubleshooting, "Electrical Connectors - Inspect". Stop.
Not OK - The voltage is not within the specified range.Repair: Inspect the common wire for an open circuit.Repair the common wire or replace the common wire.Verify that the repair eliminates the problem. Stop.Test Step 7. Check the Resistance of the Harness
Turn the keyswitch to the OFF position.
Verify that all of the sensors are disconnected.
Measure the resistance between terminal A (Analog Sensor Power +5V) and terminal B (Analog Sensor Common) on each of the sensor connectors on the engine harness.Expected Result:The resistance should be greater than 20,000 ohms, or "OL" is displayed on the multimeter.Results:
OK - The 5 volt supply and the analog sensor common are not shorted.Repair: Check the 5 volt supply for a short to ground.Repair the 5 volt supply wire or replace the 5 volt supply wire.Verify that the repair eliminates the problem. Stop.
Not OK - There is a short between the 5 volt supply and the analog sensor common.Repair: Locate the short between the 5 volt supply and the analog sensor common.Repair the faulty wiring or replace the faulty wiring.Verify that the repair eliminates the problem. Stop.