BOLT 3H0459 - Caterpillar

Illustration 1 g02947337
Table 2
Troubleshooting Test Steps    Values    Results    
1. Check the Engine Speed/Timing Circuit
A. Establish communication between Caterpillar Electronic Technician (ET) and the Electronic Control Module (ECM) . Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Turn the keyswitch to the ON position.
C. Monitor the "Engine Starting" screen in Cat ET.
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.
   
Engine starting    
Result: The engine started.
Proceed to Test Step 2.
Result: The engine did not start.
Proceed to Test Step 3.
   
2. Check for Diagnostic Codes
A. While the engine is running monitor Cat ET for diagnostic codes. Also monitor the "Engine Starting" screen for an engine speed/timing that is "Not Detected".
B. Wait at least 30 seconds for activation of the diagnostic codes. Look for these codes on Cat ET:
190-8
342-8
723-8
   
Diagnostic Trouble Codes    
Result: There is an active diagnostic code or there is a timing pattern that is "Not Detected".
Proceed to Test Step 5.
Result: There is not an active diagnostic code and there is not a timing pattern that is "Not Detected".
Download the "Warranty Report" from the engine ECM. Troubleshoot any diagnostic codes that may be present.
Return the unit to service.
   
3. Check the Battery Voltage
A. Monitor the "Engine Starting" screen in Cat ET.
Monitor the battery voltage. Crank the engine for five seconds.
Monitor the battery voltage while cranking.    
Battery voltage    
Result: The battery voltage is OK.
Proceed to Test Step 4.
Result: The battery voltage is not OK.
Refer to Troubleshooting, "Engine Cranks but Does Not Start".
   
4. Check the Engine Speed and the Engine Speed/Timing Status
A. Monitor the "Engine Starting" screen in Cat ET.
B. Crank the engine for five seconds. While the engine is cranking, verify that the sensors show an acceptable cranking speed.
C. While the engine is cranking check the status of the engine speed/timing sensors.
   
Crank speed    
Result: The sensors show an acceptable cranking speed. The timing pattern shows "Detected".
Refer to Troubleshooting, "Engine Cranks but Does Not Start".
Result: A sensor does not show an acceptable cranking speed and/or the timing pattern shows "Not Detected".
Proceed to Test Step 5.
   
Illustration 2 g02227733
Typical left side engine view (1) Crankshaft speed/timing sensor
Illustration 3 g02227753
(2) Camshaft speed/timing sensor
Table 3
Troubleshooting Test Steps    Values    Results    
5. Inspect the Sensor Assembly
A. Turn the keyswitch to the OFF position.
B. Visually inspect the sensor and the sensor assembly without removing the sensor assembly from the engine. Flanges must be flush against the surface of the front timing gear housing in order to ensure proper operation.
C. Inspect the sensor bracket . Verify that the bracket securely holds the flanges of the sensors flush against the engine.
Verify that the bracket is not bent. If the bracket is bent or if an obstruction is preventing the sensor assembly from being installed correctly, the engine will not start.
Disconnect the harness from the speed/timing sensors. Check the harness for debris and