WIPER 4660525 - Caterpillar

Primary Speed/timing Sensor
Disconnect the P401 connector from the primary speed/timing sensor.
Attempt to start the engine.
If the engine starts, check for a fault in the circuit for the primary speed/timing sensor. Refer to Troubleshooting, "Engine Speed/Timing Sensor Circuit - Test".
If the engine does not start, inspect the timing ring on the crankshaft for misalignment.
If necessary, repair the timing ring. Refer to Disassembly and Assembly, "Crankshaft Timing Ring - Remove and Install".
Attempt to start the engine. If the engine will