The Infiniti P34C4 diagnostic trouble code (DTC) indicates a problem with the intake camshaft position actuator control circuit on Bank 1. Specifically, it signifies that the driver current/temperature is too high. This article explores potential causes and troubleshooting steps for this common issue. This code often appears after timing chain, guide, and gear replacements addressing P0014 and P0017 codes. While these repairs resolve the initial timing issues, the P34C4 code can intermittently appear afterward.
Understanding the P34C4 Code After Timing Component Replacement
After replacing worn timing components, it’s common to observe altered exhaust timing PID readings, often fluctuating between -1 and +1 degrees. Prior to the repairs, Bank 1 readings typically wouldn’t fall below 13 degrees, indicating active cam phasing by the Engine Control Module (ECM). However, post-repair, the ECM might not phase the intake or exhaust cams, even without the P34C4 code present. Nissan’s service information suggests replacing the actuator motor assembly when encountering the P34C4 code.
Troubleshooting Steps for P34C4
Comparative testing of the intake actuator position/temperature sensors between Bank 1 and Bank 2 often doesn’t yield conclusive results. These sensors typically read around 1.5-1.7 volts with a warm engine. Swapping actuator motors between banks often doesn’t resolve the issue, with the P34C4 code reappearing on Bank 1.
Relearning procedures, both automatic and manual, may not always be successful. The Electric Intake Valve Timing Control (IVT) learning procedure might not initiate or complete, and the manual relearn method, involving disconnecting actuators and cycling the ignition, may not effectively reset the system.
Potential Causes of P34C4
Could a failed relearn procedure cause the Bank 1 intake actuator to overwork, leading to increased driver current/temperature in the control module? This is a possibility worth investigating. Another question is whether this system uses a 3-phase motor setup, which could influence diagnostic approaches.
Before condemning the intake actuator, consider load testing the three motor wires to assess their integrity. It’s also important to consider whether intake actuator control module failures are common for the P34C4 DTC. This information can help prioritize diagnostic efforts. Addressing the root cause of the P34C4 code is crucial for restoring proper engine performance and preventing further issues.
