P1352 - IC Output High/Pulse Detected when GND_Cyl. 2

Introduction:

The diagnostic trouble code (DTC) P1352 indicates a specific problem within the ignition system of a vehicle, related to the Integrated Circuit (IC) output signal for Cylinder 2 when that cylinder is supposed to be grounded. This code suggests that the Powertrain Control Module (PCM) is detecting an unexpected high voltage or pulse signal from the IC controlling the ignition coil for Cylinder 2 during the grounding phase of the ignition cycle. This can lead to misfires, poor engine performance, and potentially damage to the catalytic converter.

Table: P1352 - IC Output High/Pulse Detected when GND_Cyl. 2 Details

Detailed Explanations

Definition: IC Output High/Pulse Detected when GND_Cyl. 2

This code signifies that the vehicle's computer, the Powertrain Control Module (PCM), has detected an unexpected high voltage or pulse signal emanating from the Integrated Circuit (IC) or ignition control module responsible for managing the ignition coil on cylinder number 2. This occurs when the IC should be grounding the circuit to allow the coil to discharge and create a spark. The high voltage or pulse when the circuit is grounded is an anomaly, indicating a malfunction in the ignition control system.

Symptoms: Engine Misfire, Rough Idle, Poor Acceleration, Check Engine Light (CEL), Reduced Fuel Economy, Stalling

These symptoms are a direct result of the engine's inability to properly ignite the air-fuel mixture in cylinder 2. A misfire happens when there's no spark or a weak spark. This causes incomplete combustion, which leads to a loss of power (poor acceleration), an uneven engine operation (rough idle), and a noticeable decrease in fuel efficiency. The unburnt fuel can also damage the catalytic converter over time. The Check Engine Light illuminates to alert the driver to the problem. Stalling can occur if the misfire is severe enough to disrupt the engine's ability to maintain a stable idle.

Possible Causes: Faulty Ignition Coil, Wiring Issues (short to voltage, open circuit, high resistance), Faulty IC or Ignition Control Module, PCM Failure, Damaged Spark Plug or Wiring, Electrical Interference, Grounding Issues, Corrosion in Connectors

• Faulty Ignition Coil: The ignition coil transforms the low voltage from the battery into the high voltage needed to create a spark at the spark plug. If the coil is internally shorted or has a winding failure, it can cause irregular voltage signals.
• Wiring Issues: Damaged, corroded, or poorly connected wiring can cause a short to voltage, where the circuit is unintentionally connected to a power source. An open circuit means there's a break in the wire, preventing the signal from reaching its destination. High resistance in the wiring reduces the voltage reaching the coil.
• Faulty IC or Ignition Control Module: This module controls the timing and duration of the ignition spark. A malfunctioning IC can send incorrect signals to the ignition coil, leading to the P1352 code.
• PCM Failure: Although less common, a faulty PCM can misinterpret signals or send incorrect commands to the ignition system.
• Damaged Spark Plug or Wiring: A fouled, cracked, or worn spark plug can prevent proper ignition. Damaged wiring to the spark plug can also cause similar issues.
• Electrical Interference: External electrical noise can sometimes interfere with the signals between the PCM and the ignition coil.
• Grounding Issues: Poor or missing ground connections can cause erratic electrical behavior.
• Corrosion in Connectors: Corrosion can increase resistance and disrupt the flow of electricity within the electrical connectors.

Diagnostic Steps: Visual Inspection of Wiring and Connectors, Spark Plug Inspection, Ignition Coil Testing (resistance, primary/secondary), IC Signal Testing with Oscilloscope, Ground Circuit Testing, PCM Testing (voltage, continuity), Component Swapping (ignition coil), Voltage Drop Testing

• Visual Inspection of Wiring and Connectors: Begin by carefully inspecting the wiring harness and connectors associated with the ignition coil for cylinder 2. Look for any signs of damage, corrosion, loose connections, or rodent damage.
• Spark Plug Inspection: Remove the spark plug from cylinder 2 and inspect it for signs of wear, fouling, cracking, or damage. A faulty spark plug can cause misfires and trigger the P1352 code.
• Ignition Coil Testing: Use a multimeter to test the resistance of the ignition coil's primary and secondary windings. Compare the readings to the manufacturer's specifications. An open circuit or short circuit can indicate a faulty coil.
• IC Signal Testing with Oscilloscope: Use an oscilloscope to visually inspect the signal coming from the IC to the ignition coil. Look for a clean, consistent signal pattern. An irregular or missing signal can indicate a problem with the IC.
• Ground Circuit Testing: Verify that the ground circuit for the ignition coil is properly grounded. Use a multimeter to check for continuity between the ground wire and the vehicle's chassis.
• PCM Testing: Check the voltage and continuity of the PCM circuits related to the ignition system. This will help determine if the PCM is sending the correct signals.
• Component Swapping: If you suspect a faulty ignition coil, try swapping it with a known good coil from another cylinder. If the misfire moves to the other cylinder, it confirms that the coil is the problem.
• Voltage Drop Testing: Perform voltage drop testing on the wiring harness to identify any points of high resistance. Excessive voltage drop can indicate a problem with the wiring or connections.

Related Codes: P0300 (Random Misfire), P0302 (Cylinder 2 Misfire), P1351 (IC Output Low/No Pulse Detected when GND_Cyl. 2), P0352 (Ignition Coil "B" Primary/Secondary Circuit Malfunction)

• P0300 (Random Misfire): Indicates that the PCM has detected misfires in multiple cylinders. This can be related to a common issue affecting the entire ignition system.
• P0302 (Cylinder 2 Misfire): Specifically indicates a misfire in cylinder 2, which supports the P1352 code.
• P1351 (IC Output Low/No Pulse Detected when GND_Cyl. 2): This code suggests the opposite problem – the PCM is not detecting any signal from the IC when it should be present. This can also be related to wiring or IC issues.
• P0352 (Ignition Coil "B" Primary/Secondary Circuit Malfunction): This code points directly to a problem within the ignition coil circuit for cylinder 2, reinforcing the suspicion of a faulty coil or wiring.

Common Misdiagnoses: Replacing the Spark Plug Only, Replacing the Ignition Coil Only, Ignoring Wiring Issues, Assuming PCM Failure Without Thorough Testing

• Replacing the Spark Plug Only: While a worn spark plug can cause misfires, it's important to address the underlying cause of the P1352 code. Simply replacing the spark plug may not solve the problem if the issue lies with the ignition coil, wiring, or IC.
• Replacing the Ignition Coil Only: Similar to the spark plug, replacing the ignition coil without thoroughly testing the wiring and IC can lead to misdiagnosis.
• Ignoring Wiring Issues: Wiring problems are a common cause of ignition system malfunctions. Failing to inspect and test the wiring can result in misdiagnosis and repeated repairs.
• Assuming PCM Failure Without Thorough Testing: PCM failures are relatively rare. Before replacing the PCM, it's crucial to rule out all other possible causes through comprehensive testing.

Severity: Moderate to High

The severity of P1352 can range from moderate to high. A misfire can cause drivability issues and reduce fuel economy. However, the most significant concern is the potential damage to the catalytic converter. Unburnt fuel entering the catalytic converter can cause it to overheat and fail, leading to expensive repairs. Ignoring the code can also lead to further engine damage.

Repair Costs: Variable, depending on the component needing replacement (Spark Plug: $20-$50, Ignition Coil: $50-$200, Wiring Repair: $50-$300, PCM: $300-$1200)

Repair costs can vary significantly depending on the root cause of the P1352 code. A simple spark plug replacement may cost between $20 and $50. Replacing the ignition coil can range from $50 to $200. Wiring repairs can vary from $50 to $300, depending on the extent of the damage. PCM replacement is the most expensive option, potentially costing between $300 and $1200. These prices are estimates and can vary depending on the vehicle make, model, and labor rates in your area.

Frequently Asked Questions

• What does the P1352 code mean? It indicates a problem with the ignition control circuit for cylinder 2, specifically an unexpected high voltage or pulse when the circuit should be grounded. This usually points to a faulty ignition coil, wiring issue, or a problem with the ignition control module.

• Can I drive with a P1352 code? Driving is not recommended, as it can cause further damage to the engine and catalytic converter due to misfires. It's best to address the issue as soon as possible.

• How do I fix the P1352 code? The fix depends on the root cause. Common solutions include replacing the spark plug, ignition coil, repairing wiring, or replacing the ignition control module.

• Is a P1352 code serious? Yes, it can be serious as it can damage the catalytic converter and lead to decreased engine performance and fuel economy. Prompt diagnosis and repair are recommended.

• Do I need a mechanic for a P1352 code? If you are not comfortable working on your car's ignition system, it's best to consult a qualified mechanic. They have the tools and expertise to diagnose and repair the problem correctly.

Conclusion

The P1352 code indicates a specific problem with the ignition system for cylinder 2, typically involving the ignition coil circuit. A systematic approach to diagnosis, including visual inspection, component testing, and wiring checks, is essential for identifying the root cause and preventing further damage.