B1288 – Servo Motor Potentiometer Airintake Right Circuit Failure

The ODBII code B1288 indicates a failure in the servo motor potentiometer circuit for the right air intake, which may affect the operation of the air intake system.

The severity of ODBII code B1288 is generally considered moderate to severe.

Common Causes For: B1287 Servo Motor Potentiometer Airintake Left Circuit Short To Ground

• Faulty servo motor
• Damaged wiring or connectors
• Failed potentiometer
• Short circuit in the circuit
• Open circuit in the circuit
• Corrosion or poor connections
• Malfunctioning engine control module (ECM)
• Mechanical obstruction in the air intake system

Common misdiagnosis for B1288 Servo Motor Potentiometer Airintake Right Circuit Failure

• Throttle body issues
• Air intake sensor failure
• Wiring harness problems
• ECM/PCM malfunction
• Vacuum leaks
• Other potentiometer failures
• Faulty servo motor
• Calibration errors

Common Troubleshooting Steps

The OBD-II code B1288 indicates a problem with the servo motor potentiometer circuit for the air intake system, specifically on the right side. This code is often associated with issues in the vehicle’s air intake system, which can affect engine performance and emissions. Here are some common troubleshooting steps to diagnose and potentially resolve the issue:

• Check for Additional Codes: Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are multiple issues.
• Inspect Wiring and Connectors: Visually inspect the wiring and connectors associated with the servo motor potentiometer. Look for:
• Damaged, frayed, or corroded wires.
• Loose or disconnected connectors.
• Signs of moisture or dirt that could affect connections.
• Test the Servo Motor: If accessible, test the servo motor itself for proper operation. This may involve:
• Checking the resistance of the motor windings.
• Applying power directly to the motor to see if it operates correctly.
• Check the Potentiometer: The potentiometer is responsible for providing feedback to the engine control module (ECM). Test the potentiometer for:
• Proper resistance values according to the manufacturer’s specifications.
• Smooth operation without dead spots when moved through its range.
• Inspect the Air Intake System: Check the air intake system for any obstructions or leaks that could affect the operation of the servo motor. Look for:
• Cracks or breaks in the intake ducting.
• Loose clamps or connections.
• Blockages in the air filter or intake manifold.
• Check the ECM: Ensure that the engine control module is functioning correctly. This may involve:
• Checking for software updates or reprogramming if necessary.
• Inspecting for any signs of damage or corrosion.
• Perform a Voltage and Ground Test: Use a multimeter to check for proper voltage and ground at the servo motor and potentiometer connections. Ensure that:
• The voltage supply is within the specified range.
• The ground connections are solid and free of corrosion.
• Clear Codes and Test Drive: After performing repairs or adjustments, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns.
• Consult Service Manual: Refer to the vehicle’s service manual for specific diagnostic procedures, wiring diagrams, and specifications related to the air intake system and the B1288 code.
• Seek Professional Help: If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these troubleshooting steps, you can systematically identify and address the underlying issues related to the B1288 code.