SEAL-O-RING 9X7317 - Caterpillar

Table 1
J1939 Code and Description Comments
636-2
Engine Position Sensor : Erratic, Intermittent, or Incorrect The camshaft position sensor signal is not stable. The camshaft position is intermittently detected. The code will be active if the Electronic Control Module (ECM) detects an abnormal signal.
636-8
Engine Position Sensor : Abnormal Frequency, Pulse Width, or Period The camshaft position sensor signal is not detected within 4 camshaft revolutions. The code is deactivated and logged if normal camshaft position detection returns.
636-31
Engine Position Sensor : Condition Exists The camshaft position sensor detects an abnormal timing pattern offset between the crankshaft signal and the expect camshaft position. The mechanical timing of the camshaft position is incorrect. The code is deactivated and logged if normal camshaft position detection returns. Refer to Testing and Adjusting, “Rear Gear Group-Time.
637-2
Engine Position Sensor : Erratic, Intermittent, or Incorrect The crankshaft position sensor signal is not stable. The crankshaft position is intermittently detected by the engine ECM.
637-9
Engine Position Sensor : Abnormal Update Rate The crankshaft position sensor signal is not detected by the engine ECM.
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:
• 636-2
• 636-8
• 637-2
• 637-9
Parameters:
• "Engine Speed"
•"Engine Speed Secondary Sensor"
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 engine speed is detected.
Repair: If the diagnostic codes that are listed above are not active or logged as well as the "Engine Speed and Secondary Engine Speed" sensor feedback status is showing a valid speed signal and the engine is not running properly, refer to the appropriate engine symptom in this Troubleshooting Manual.
Result: If a 636-2 or a 637-2 code is active or logged.
Proceed to Test Step 2.
Result: Codes 636-8 or 637-9 code is active and no engine rpm is detected. Cat ET is not reporting engine rpm for at least one engine speed/timing sensor while the engine is cranked.
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 sensor is secure and the flange of the sensor is flush against the mounting surface.
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.