A 2004 Nissan Frontier with a VG33E engine (confirmed via VIN) experienced a sudden shutdown while driving. Prior to this, the truck exhibited intermittent stalling, particularly when using the AC or heater. Initial diagnostic codes pointed to a faulty camshaft sensor and knock sensor, both of which were replaced. However, the engine remained unresponsive, now displaying only a P0340 code. This code specifically indicates a problem with the Camshaft Position Sensor (CMP) circuit.
Given the VG33E engine’s configuration, the camshaft position sensor is located within the distributor. Accessing the knock sensor, which was initially replaced, requires removing the upper intake manifold. The current working theory is that there might be a second camshaft sensor or a related wiring issue triggered during the initial repair process.
Confusion arises from conflicting information regarding the camshaft sensor in first-generation Nissan Frontiers. Some sources suggest only a crankshaft sensor is present in these models, while others indicate both camshaft and crankshaft sensors are utilized in second-generation Frontiers. This discrepancy makes pinpointing the exact cause of the P0340 code in this specific 2004 Frontier with the 3.3 V6 (VG33E) more challenging.
Troubleshooting a P0340 code typically involves inspecting the CMP sensor itself, its wiring harness, and the associated connector for damage or corrosion. Verifying proper voltage supply to the sensor is also crucial. Furthermore, examining the timing belt or chain for potential misalignment or damage that might affect the sensor’s readings is necessary.
Given the engine’s age and the work already performed, a thorough inspection of the wiring and connectors around the distributor and intake manifold is recommended. Any disturbed or damaged components during the knock sensor replacement should be carefully scrutinized. A specific diagnostic procedure for the VG33E engine, including detailed wiring diagrams, would be beneficial in accurately diagnosing and resolving the P0340 code and getting this Nissan 3.3 V6 back on the road.
