3661379 ELECTRONICS GP-ENGINE RATINGS Caterpillar parts
772G
Rating:
Alternative (cross code) number:
CA3661379
366-1379
3661379
CA3661379
366-1379
3661379
TRUCK,
Compatible equipment models: 3661379:
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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 with an engine speed once the ECM is able to calculate a speed from the signal.
Check for one of the following logged diagnostic codes or active diagnostic codes:
190-08 Engine Speed is abnormal
342-08 Secondary Engine Speed signal is abnormalExpected Result:One of the above codes are active or logged.Results:
Active Code - There is an active code for an engine speed/timing sensor. Proceed to Test Step 4.
Logged Code - There is a logged code for an engine speed/timing sensor. Proceed to Test Step 6.
No engine rpm - Engine speed is not indicated on Cat ET. Proceed to Test Step 4.Test Step 4. Measure the Resistance of the Wiring and the Sensor
Turn the keyswitch to the OFF position.
Disconnect the P2 connector.
Perform the following procedure in order to measure the resistance of the primary engine speed/timing sensor:
Measure the resistance from P2-35
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 with an engine speed once the ECM is able to calculate a speed from the signal.
Check for one of the following logged diagnostic codes or active diagnostic codes:
190-08 Engine Speed is abnormal
342-08 Secondary Engine Speed signal is abnormalExpected Result:One of the above codes are active or logged.Results:
Active Code - There is an active code for an engine speed/timing sensor. Proceed to Test Step 4.
Logged Code - There is a logged code for an engine speed/timing sensor. Proceed to Test Step 6.
No engine rpm - Engine speed is not indicated on Cat ET. Proceed to Test Step 4.Test Step 4. Measure the Resistance of the Wiring and the Sensor
Turn the keyswitch to the OFF position.
Disconnect the P2 connector.
Perform the following procedure in order to measure the resistance of the primary engine speed/timing sensor:
Measure the resistance from P2-35
Caterpillar parts catalog:
Parts electronics Caterpillar catalog:
3764716
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