5005647 JOHNSON Service Manual - English

Illustration 1 g01150285
Schematic for the engine speed/timing circuit
Test Step 1. Check for Diagnostic Codes
Connect Cat ET to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools".
Turn the keyswitch to the ON position.
Start the engine and run the engine until the engine is at the normal operating temperature. Note: If the engine will not start, monitor the engine rpm on Cat ET while the engine is being cranked. Cat ET may need to be powered from another battery while the engine is being cranked.
Check for the following diagnostic codes:
190-02
190-11
342-02
342-11Note: 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 rpm on the electronic service tool while the engine is being cranked. The electronic service tool may need to be powered from another battery while the engine is being cranked. This is done so the electronic service tool will not reset.Expected Result:One or both of the diagnostic codes that are listed above are logged or active.Note: If the engine will not start and Cat ET displayed 0 rpm during cranking, select "No Engine rpm".Results:
No Engine rpm - Engine rpm is not indicated on Cat ET. Proceed to Test Step 2.
Active Code - There is an active diagnostic code or a logged diagnostic code for an engine speed/timing sensor. Proceed to Test Step 4.
No Codes - None of the codes that are listed are active or logged.Repair: Refer to the appropriate symptoms in Troubleshooting, "Troubleshooting Without a Diagnostic Code".STOPTest Step 2. Check the Installation of the Sensors and the Bracket
Illustration 2 g01176097
Typical engine speed/timing sensor
(1) Mounting flange
(2) Mounting surface
Visually inspect each sensor assembly without removing the sensor assembly from the engine. Ensure that flange (1) is installed squarely against surface (2). Remove the suspect sensor assembly from the engine.
Illustration 3 g01167704
Typical engine speed/timing sensor
(3) O-ring
Ensure that one O-ring (3) is installed on the sensor. Check the O-ring for damage. Replace the O-ring, if necessary. Results:
OK - The sensor's components are OK.Repair: Perform the following procedure in order to properly install the sensor assembly:
Lubricate the O-ring with engine oil.
Fully seat the sensor assembly in the engine. Note: If the sensor assembly will not fully seat into the engine, replace the sensor assembly.
Tighten the bracket bolt.
Connect the sensor's electrical connectors. Verify that the connectors are latched on both sides.
Ensure that the harness is properly secured, and that the tie-wraps are placed in the correct location. Proceed to Test Step 4.
Not OK - At least one of the sensor assembly's components is not OK.Repair: Obtain a new sensor assembly. Perform the following procedure in order to properly install the sensor assembly:
Lubricate each O-ring with engine oil.
Fully seat the sensor assembly in the engine. Note: If the sensor assembly will not fully seat into the engine, replace the sensor assembly.
Tighten the bracket bolt.
Connect the sensor's electrical connectors. Verify that the connector is latched.
Ensure that the harness is properly secured, and that the tie-wraps are placed in the correct location. Verify that the problem is resolved.STOPTest Step 3. Inspect the Electrical Connectors and the Wiring
Illustration 4 g01175131
Engine components for the engine speed/timing sensors
(4) J402/P402 connectors for the secondary engine speed/timing sensor
(5) J401/P401 connectors for the primary engine speed/timing sensor
(6) J2/P2 ECM connector
Thoroughly inspect connectors (4), (5), and (6). Refer to Troubleshooting, "Electrical Connectors - Inspect".
Illustration 5 g01175138
P2 terminals that are associated with the engine speed/timing sensors
(P2-48) Primary engine speed/timing −
(P2-49) Primary engine speed/timing +
(P2-58) Secondary engine speed/timing +
(P2-59) Secondary engine speed/timing −