0437773 JOHNSON CHECK VALVE

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Left side engine viewIf a replacement of the ECM is required, the ECM parameters can be transferred from the suspect ECM to the replacement ECM. This feature requires the electronic service tool and this feature is only possible if the existing ECM can communicate with the electronic service tool.When the sensors are being installed, complete all of the following tasks:
Lubricate the O-ring with oil.
Ensure that the sensor has a face seal inside the connector body. If a seal is damaged or missing, replace the seal.
Ensure that the sensor is fully seated into the engine before tightening the bracket bolt.
Ensure that 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.
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Schematic for the speed/timing sensorsTest Step 1. Connect The Electronic Service Tool and Note All Diagnostic Codes
Connect the electronic service tool to the cab data link connector.
Turn the key switch to the ON position.
Check for one of the following logged diagnostic codes or active diagnostic codes:
190-02 Loss of Engine Speed Signal
190-11 Engine Speed Signal unknown error
342-02 Loss of Secondary Engine Speed signal
342-11 Secondary Engine Speed Sensor mechanical failureNote: 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 from 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 more of the diagnostic codes that are listed above are logged or active.Note: If you have been referred here from Troubleshooting, "Troubleshooting without a Diagnostic Code" for the following reason, select "No Engine rpm":
The engine rpm was not indicated on the electronic service tool.Results:
OK - There is an active diagnostic code or a Logged diagnostic code. Proceed to Test Step 3.
Not OK - If none of the codes that are listed are active diagnostic codes or Logged diagnostic codes and the engine is not running properly, refer to the appropriate symptoms in the service manual. Stop.
No Engine rpm - Engine rpm is not indicated on the electronic service tool. Proceed to Test Step 2.Test Step 2. Check the Installation of the Sensors and the Bracket
Illustration 3 g00767308
Flange of the sensor and mounting bracket
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 one O-ring has been installed on the sensor, and ensure that the O-ring is free of damage.Note: If the flange of the sensor is bent or if an obstruction is preventing the sensor from reading a good pattern, the engine will not start.Results:
OK - The sensors and the bracket are properly installed. Proceed to Test Step 3.
Not OK - Repair: Perform the following procedure in order to properly install the sensors and the bracket:
Loosen the bolt that holds the sensor mounting bracket to the engine.
Seat the sensor and tighten the bolt.If the sensor will not seat, repair the sensor or replace the sensor, as required.Note: The sensor must not be removed from the bracket.
Ensure that the sensor is properly oriented and that the harness is secured in the proper location.
Verify that the repair eliminates the problem. Stop.Test Step 3. Measure the Sensor Resistance Through the Engine Harness
Illustration 4 g00807221
Terminal locations for ECM
Turn the key switch to the OFF position.
Thoroughly inspect ECM vehicle harness connector J2/P2. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on the following wires in the ECM engine harness connector P2 that are associated with the engine speed/timing sensors:
P2:48 (Top camshaft speed/timing sensor positive)
P2:49 (Top camshaft speed/timing sensor negative)
P2:58 (Bottom camshaft speed/timing sensor positive)
P2:59 (Bottom camshaft speed/timing sensor negative)Refer to Illustration 4.
Ensure that the latch tab on the connector is properly latched and ensure that the latch tab is fully latched.
Check the ECM connector (allen head screw) for the proper torque of 6.0 N m (55 lb in).
Repair the harness or repair the connector if a problem is found.
Ensure that the wiring harness is correctly routed and secured at the proper locations.
Ensure that the harness wiring is not pulled too tightly. When the harness wiring is pulled too tightly, vibrations or movement can cause intermittent connections.
Inspect the harness wiring for nicks and abrasions.
If the harness and the connector are OK, disconnect ECM connector J2/P2.
Use the following procedure to measure the sensor resistance (Ohms) for the top camshaft position sensor:Refer to Illustration 4.
Use a multimeter to measure the resistance from P2:48 (Top camshaft speed/timing sensor positive) to P2:49 (Top camshaft speed/timing sensor negative).
Check for an intermittent open circuit or short circuit by moving the harness while the measurement