P0205 Injector Circuit Malfunction Cylinder 5

Definition: The OBD-II code P0205 indicates a malfunction in the fuel injector circuit for cylinder number 5. This means that the engine control module (ECM) has detected an issue with the electrical circuit or performance of the injector.

Description:

• The ECM monitors the operation and performance of each fuel injector. When it detects a problem such as an open or shorted circuit, poor connection, or faulty injector, it triggers this code.
• This can result in rough idling, misfires, reduced fuel efficiency, and increased emissions.

P0202 Injector Circuit Malfunction Cylinder 2

Definition: The OBD-II code P0202 indicates a malfunction in the fuel injector circuit for cylinder number 2. Similar to P0205, this suggests an issue with the electrical circuit or performance of the injector specific to cylinder 2.

Description:

• The ECM detects irregularities such as open circuits, shorts, or poor connections within the injector’s circuitry for cylinder 2.
• This may lead to symptoms like engine misfire on cylinder 2, poor acceleration, and increased exhaust emissions.

p0205 – Injector Circuit Malfunction Cylinder 5

Typical Severity: Moderate

Common Causes

P0205 Injector Circuit Malfunction Cylinder 5

Common Causes:

• Faulty fuel injector
• Open or short in the wiring harness to the injector
• Poor electrical connection at the injector
• Faulty Engine Control Module (ECM)

 

Common Misdiagnosis

OBD2 Code: P0205

Description: Injector Circuit Malfunction Cylinder 5

Common Misdiagnosis: Replacing the fuel injector without checking for wiring issues or ECM/PCM faults.

OBD2 Code: P0202

Description: Injector Circuit Malfunction Cylinder 2

Common Misdiagnosis: Assuming a faulty injector when the issue may be due to poor electrical connections or a problem with the powertrain control module (PCM).

 

Common Diagnostic Steps

OBD2 Code: P0205

Description: Injector Circuit Malfunction Cylinder 5

• Visually inspect the injector wiring and connectors for damage or corrosion.
• Check the resistance of the fuel injector using a multimeter to ensure it is within specifications.
• Test the voltage at the fuel injector connector with the ignition on to verify power supply.
• Use an oscilloscope to check for proper signal from the engine control module (ECM) to the injector.
• Swap the suspect injector with another cylinder to see if the problem follows, indicating a faulty injector.
• Inspect and test related fuses and relays associated with the fuel injection system.
• If necessary, replace or repair any damaged components found during inspection and testing.

OBD2 Code: P0202

Description: Injector Circuit Malfunction Cylinder 2

• Perform a visual inspection of all wiring and connectors related to cylinder 2’s fuel injector for signs of wear or damage.
• Measure resistance across cylinder 2’s fuel injector terminals using a multimeter; compare against manufacturer specifications.
• Verify that there is adequate voltage at cylinder 2’s fuel injector connector when ignition is turned on.
• An oscilloscope can be used to confirm that ECM signals are reaching cylinder 2’s fuel injector correctly.
• If feasible, switch injectors between cylinders to determine if malfunction moves, suggesting an issue with the specific injector itself.
• Examine relevant fuses and relays in connection with cylinder-specific injection circuits for faults.
• If diagnostics indicate failure, proceed with replacement or repair of defective parts as needed.

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