CYLINDER BLOCK AS 1062780 - Caterpillar

Table 2
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Start the engine.
C. Run the engine until normal operating temperature is reached.
Note: If the engine will not start, monitor the engine rpm on Cat ET when the engine is being cranked. If necessary, power Cat ET from another battery when the engine is being cranked.
D. Look for these codes and pattern status parameters on Cat ET:
Codes:
• 190–08
• 723–08
Parameters:
• "Primary Engine Speed Sensor Timing Pattern Status"
• "Secondary Engine Speed Sensor Timing Pattern Status"
Note: When checking status parameters, engine must be in a cranking state.
Codes
Result: None of the diagnostic codes that are listed above are active or logged and the primary/secondary speed sensor timing status is "OK".
Repair: If the diagnostic codes that are listed above are not active or logged as well as the primary/secondary speed sensor timing status is "OK", and the engine is not running properly, refer to the appropriate engine symptom in this Troubleshooting Manual.
Result: If a 190-08 or a 723-08 code is active or logged or primary/secondary speed sensor timing status is "Not OK".
Proceed to Test Step 2.
Result: No engine rpm. -Cat ET is not reporting engine rpm for at least one engine speed/timing sensor while the engine is cranked or at least one of the speed timing pattern status parameter are displayed as "Not OK".
Proceed to Test Step 3.
2. Check the Installation of the Sensor Assembly
A. Turn the main disconnect switch to the OFF position.
B. Visually inspect the sensors without removing the sensor assembly from the engine.
Verify that the bracket securely holds the flange of the sensor flush against the mounting surface.
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.
Note: The bracket cannot be replaced separately.
C. Remove the suspect engine speed/timing sensor from the engine.
D. Ensure that the O-ring seals are installed and free of damage.
Sensor
Result: The O-ring seals are properly installed. The bracket and the seals are free of damage.
Repair: Perform the following procedure:
1. Lubricate the O-ring seals with oil.
2. Fully seat the sensor into the housing.
Note: If the sensor assembly will not fully seat into the engine, replace the sensor assembly.
3. Tighten the bolts.
4. Connect the connector.
5. Ensure that the harness is properly secured, and that the tie-wraps are placed in the correct location.
Proceed to Test Step 3.
Result: At least one of the sensor assembly components is NOT OK.
Repair: Install a new sensor assembly.
If the problem is not resolved, proceed to Test Step 3.
3. Inspect the Electrical Connectors and the Wiring
A. Turn the main disconnect switch to the OFF position.
B. Thoroughly inspect the connectors. Refer to Troubleshooting, "Electrical Connectors-Inspect" for additional information.
C. Perform a 45 N (10 lb) pull test on the connector wires.
D. Check the harness for abrasions and pinch points.
Connectors and Wiring
Result: The connectors and wiring appear to be OK.
Proceed to Test Step 4.
Result: There is a problem with the connectors