Encountering a situation where your 2013 Toyota Tundra 5.7L engine won’t start and you can’t establish communication with a scan tool can be frustrating. This issue, characterized by a no-start condition and the inability to read diagnostic codes, often points to a deeper electrical or computer system problem. This guide explores potential causes and troubleshooting steps based on real-world experiences from Tundra owners facing similar challenges.
Understanding the Symptoms
A “no communication with scan tool” scenario in a 2013 Toyota Tundra 5.7L is typically accompanied by a cluster of symptoms beyond just the inability to connect a diagnostic scanner. These can include:
- Engine Cranks But Won’t Start: The engine turns over, indicating the battery and starter are functioning, but it fails to ignite and run.
- No Spark: Testing for spark at the spark plugs reveals an absence of ignition.
- Fuel Pump Inactive: The fuel pump doesn’t engage, preventing fuel delivery to the engine.
- Check Engine Light (CEL) Absence (Initially): The malfunction indicator lamp might not illuminate initially, although it may appear later after attempting to start or perform workarounds.
- Flashing 4WD Lights & Illuminated Warning Lights: The 4WD high and low indicators may flash, alongside ABS, traction control, and transmission temperature warning lights.
- Multiple Seemingly Unrelated Error Codes (After Forced Start): In some cases, like the one described in the original post, disconnecting the power steering pressure sensor might allow the engine to start. Subsequently, a scan tool might then connect and pull a multitude of error codes across various systems.
Potential Causes and Troubleshooting Steps
When faced with a 2013 Tundra 5.7L exhibiting no communication with a scan tool, consider these potential culprits:
1. Power Steering Pressure Sensor and Related Circuits
Interestingly, as highlighted in the original post, disconnecting the power steering pressure sensor plug allowed the engine to start in one instance. This suggests a potential short circuit or sensor malfunction within the power steering pressure sensor circuit that could be disrupting the vehicle’s computer system.
- Inspect the Power Steering Pressure Sensor and Wiring: Carefully examine the power steering pressure sensor, its connector, and the associated wiring harness for any signs of damage, corrosion, or shorts.
- Test Sensor Voltage and Ground: Use a multimeter to check for proper voltage and ground at the sensor connector. An abnormal reading, as mentioned in the original post (5 volts present, but zero when plugged in), could indicate a wiring issue or sensor malfunction.
2. ECM/PCM (Engine Control Module/Powertrain Control Module) Issues
The inability to communicate with a scan tool strongly suggests a problem with the ECM/PCM itself or its power and ground supply. The ECM/PCM is the central computer controlling the engine and diagnostics; if it’s not functioning correctly or powered up, communication will be impossible.
- Check ECM/PCM Power and Ground: Locate the ECM/PCM and verify that it is receiving proper power and ground. Consult a wiring diagram for the 2013 Toyota Tundra 5.7L to identify the correct power and ground pins. Check fuses and relays related to the ECM/PCM.
- Inspect ECM/PCM Connectors: Examine the connectors going into the ECM/PCM for corrosion, bent pins, or loose connections.
3. Wiring Harness and Communication Bus Problems
A fault in the vehicle’s wiring harness, particularly the communication bus (CAN bus), can disrupt communication between the scan tool and the ECM/PCM, as well as other modules.
- CAN Bus Integrity Check: If you have access to advanced diagnostic tools, check the integrity of the CAN bus. A break or short in the CAN bus wiring can cripple communication.
- Visual Wiring Inspection: Thoroughly inspect the wiring harness, especially in areas prone to damage like near the engine, exhaust, or chassis. Look for chafed wires, rodent damage, or corroded connectors.
4. Sensor Signal Conflicts or Overload
While less common, a cascade of sensor failures or conflicting signals could potentially overwhelm the ECM/PCM, leading to communication issues. The numerous error codes retrieved after the forced start in the original post might indicate a broader system disturbance.
- Analyze Error Code Patterns: The error codes (P0553, P0013, P0023, P0102, P0113, P0348, P0368, P0393, P1343, P1614, P2716, P01340, P0101, P0894, P2714) listed in the original post point to issues across various systems – power steering, camshaft position sensors/actuators, MAF/IAT sensor, secondary air injection, and transmission. This widespread nature suggests a potential common root cause like a voltage issue, ground problem, or ECM/PCM malfunction rather than individual sensor failures.
Interpreting the Error Codes (Example from Original Post)
The extensive list of error codes provided in the original forum post is crucial for diagnosis when communication is eventually established. These codes, while seemingly diverse, might stem from a single underlying issue disrupting the vehicle’s electrical or computer system. For instance, multiple “high input” codes for sensors could indicate a voltage reference problem within the ECM/PCM or a wiring fault affecting the sensor reference voltage supply.
Conclusion
Troubleshooting a “2013 Toyota Tundra 5.7L no communication with scan tool” requires a systematic approach. Begin by meticulously checking the power steering pressure sensor circuit based on the user’s experience. Then, focus on verifying the ECM/PCM’s power and ground, inspecting wiring harnesses, and analyzing any retrieved error codes for patterns. Due to the complexity of modern vehicle electronics, if you are not comfortable with advanced electrical diagnostics, seeking assistance from a qualified automotive technician is highly recommended to accurately diagnose and repair the no-communication and no-start issue on your Toyota Tundra.
