VALVE GP-CONTROL 4790565 - Caterpillar

and Assembly, "Crankshaft Position Sensor - Remove and Install". If the secondary speed/timing sensor must be replaced or the sensor must be reinstalled, refer to Disassembly and Assembly, "Camshaft Position Sensor - Remove and Install".Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair has eliminated the fault.STOPTest Step 2. Check for Active Diagnostic Codes and Recently Logged Diagnostic Codes
Turn the keyswitch to the OFF position.
Connect the electronic service tool to the diagnostic connector.
Turn the keyswitch to the ON position. If the engine will start, then run the engine.
Use the electronic service tool in order to monitor active diagnostic codes or recently logged diagnostic codes. Results:
Diagnostic code 190-8 is active or recently logged. - Proceed to Test Step 5.
Diagnostic code 723-8 is active or recently logged. - Proceed to Test Step 5.
Diagnostic code 637-11 is active or recently logged. - Proceed to Test Step 3.
Diagnostic code 678-3 is active or recently logged. - Proceed to Test Step 5.
Diagnostic code 678-4 is active or recently logged. - Proceed to Test Step 5.
No active diagnostic codes or recently logged diagnostic codes are displayed. -
STOPTest Step 3. Inspect the Sensors
Ensure that the speed/timing sensors are correctly seated in the cylinder block and that the retaining bolts are tightened to a torque of 22 N m (16 lb ft). Ensure that the speed/timing sensors are not damaged. Replace any damaged sensors. Refer to Disassembly and Assembly, "Crankshaft Position Sensor - Remove and Install" or refer to Disassembly and Assembly, "Camshaft Position Sensor - Remove and Install".
Use the electronic service tool to check if the 637-11 diagnostic code is still active.Results:
A 637-11 diagnostic code is still active at this time. - Proceed to Test Step 4.
A 637-11 diagnostic code is not active at this time. - Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.STOPTest Step 4. Check the Crankshaft Timing Ring and the Timing Ring on the Camshaft
Remove the primary speed/timing sensor and the secondary speed/timing sensor. Refer to Disassembly and Assembly, "Crankshaft Position Sensor - Remove and Install" or refer to Disassembly and Assembly, "Camshaft Position Sensor - Remove and Install".
Use a flashlight in order to check the timing ring on the camshaft through the camshaft timing hole for damage.
Use a flashlight in order to check the crankshaft timing ring for damaged teeth or missing teeth. Ensure that the crankshaft timing ring has not been displaced from the crankshaft.Results:
Found fault with the crankshaft timing ring or the timing ring on the camshaft - Repair: If necessary, replace the camshaft. Refer to Disassembly and Assembly, "Camshaft - Remove" and refer to Disassembly and Assembly, "Camshaft - Install".If necessary, replace the crankshaft timing ring. Refer to Disassembly and Assembly, "Crankshaft Timing Ring - Remove and Install" .Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair has eliminated the fault.STOP
No faults found - Repeat this