81610M Mariner HOUSING, LOWER MOUNT-PORT

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Schematic for the engine speed/timing sensorsTest Step 1. Inspect Electrical Connectors and Wiring
Turn the keyswitch to the OFF position.
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Typical C-11 and C-13 sensor locations (left side engine view) (1) J2/P2 ECM connector (2) Secondary engine speed/timing sensor (3) Primary engine speed/timing sensor
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Typical C-15 sensor locations (left side engine view) (4) J2/P2 ECM connector (5) Secondary engine speed/timing sensor (6) Primary engine speed/timing sensor
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(P2-48) Primary engine speed/timing signal (+) (P2-49) Primary engine speed/timing signal (−) (P2-58) Secondary engine speed/timing signal (+) (P2-59) Secondary engine speed/timing signal (−)
Thoroughly inspect ECM connector (1). Also, thoroughly inspect the connectors for sensors (2) and (3) .Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector and the sensor connectors that are associated with the circuit.
Check the ECM connector (allen head screw) for the proper torque. Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect" for details.
Check the harness and wiring for abrasions and for pinch points from the sensors back 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. Check for Active Diagnostic Codes
Connect the Caterpillar Electronic Technician ( ET) to the service tool connector.
Turn the keyswitch to the ON position.
Verify whether any of the following diagnostic codes are active or logged:
22-11 Primary to Secondary Engine Speed Signal Calibration
64-08 Secondary Engine Speed loss of signal
190-08 Primary Engine Speed Loss of Signal
If the diagnostic code is logged but not active, run the engine until the engine is at normal operating temperature. The problem may only 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 need power from another battery during cranking in order to ensure that Cat ET does not reset.Note: Upon initial cranking, the status for engine speed may indicate that the engine speed signal is abnormal. This message will be replaced with an engine speed once the ECM is able to calculate a speed from the signal.Expected Result:One or more of the diagnostic codes that are listed above are logged or active.Results:
Active Code - There is an active diagnostic code or a logged diagnostic code. Proceed to Test Step 4.
No Engine rpm - Engine rpm is not indicated on Cat ET. Proceed to Test Step 3.Test Step 3. Inspect the Sensor Assembly
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Engine speed/timing sensors (7) Bracket (8) Secondary speed/timing sensor (9) Mounting plate (10) O-ring seals (11) Bracket (12) Primary speed/timing sensor
The flange of the sensor should be flush against the engine in order to ensure proper operation.
Inspect the bracket in order to ensure that the installation allows the flange of the sensor to be flush against the engine.Verify that the bracket is not bent.Note: The bracket cannot be replaced separately.
Ensure that the O-ring has been installed on the sensor, and ensure that the O-ring is free of damage.
If the following diagnostic code is active, there may be a problem with the assembly of the camshaft gear or the cranksha