805444 1 Mercruiser CLIP, Dipsitck Tube

Illustration 1 g03735872
Schematic
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P2 connector (P2-25) Primary engine speed/timing signal (−) (P2-26) Timing calibration probe (+) (P2-35) Primary engine speed/timing signal (+) (P2-36) Timing calibration probe (−) (P2-46) Secondary engine speed/timing signal (+) (P2-47) Secondary engine speed/timing signal (−)
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Typical location of sensors (1) Secondary engine speed/timing sensor (2) Primary engine speed/timing sensor
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Engine speed/timing sensors (1) Brackets (2) Integral connectors (3) O-ring seals (4) SensorsTest Step 1. Inspect the Electrical Connectors and Wiring
Turn the keyswitch to the OFF position.
Turn the disconnect switch for the battery to the OFF position.Note: For the following steps, refer to Troubleshooting, "Electrical Connectors - Inspect".
Thoroughly inspect the ECM J2/P2 connectors and the connectors for the engine speed/timing sensors.
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the engine speed/timing sensor.
Check the ECM connector (allen head screw) for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Check the harness and wiring for abrasion and for pinch points from the engine speed/timing sensors to the ECM.Expected Result:All connectors, pins, and sockets are coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The harness and wiring are OK. Proceed to Test Step 2.
Not OK - There is a problem in the connectors and/or wiring.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are coupled.Verify that the repair eliminates the problem.STOPTest Step 2. Inspect the Sensor Assembly
Remove the engine speed/timing sensors from the engine.
Ensure that one O-ring seal is installed on each sensor, and ensure that the O-ring seals are free of damage.Expected Result:Two undamaged O-ring seals are properly installed. The brackets are not bent. The flange for each sensor can be flush against the housing.Results:
OK - Two undamaged O-ring seals are properly installed. The brackets are not bent. The flange for each sensor can be flush against the housing.Repair: Perform the following procedure in order to install a sensor assembly properly:
Lubricate the O-ring seal with oil.
Fully seat the sensor into the housing.
Tighten the bracket bolt.
Connect the connector and verify that the latch tab of the connector is latched on both sides.
Ensure that the harness is properly secured, and ensure that the harness is attached to the harness clip. Proceed to Test Step 3.
Not OK - The sensor assembly has a mechanical problem.Repair: Replace the sensor assembly.Note: Do not switch the positions of the sensors. The sensors are not interchangeable. A timing calibration is not required when the sensors are replaced.
Lubricate the O-ring with oil.
Fully seat the sensor into the housing.
Tighten the bracket bolt.
Connect the connector and verify that the latch tab of the connector is latched on both sides.
Ensure that the harness is properly secured, and ensure that the harness is attached to the harness clip.Verify that the problem is resolved.STOPTest Step 3. Check for Active Diagnostic Codes
Turn the disconnect switch for the battery to the ON position.
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Turn the keyswitch to the ON position.
Start the engine and run the engine. The problem may occur when the engine is at any operating temperature. However, the problem is more likely to occur when the engine is at the normal operating temperature.
If the engine will not start, monitor the engine speed on Cat ET while the engine is being cranked. Cat ET may be powered from another battery while the engine is being cranked if necessary. Powering from another battery is done so that Cat ET will not reset.Note: Upon initial cranking, the status for engine speed may indicate that the engine speed signal is abnormal. This message should be replaced w