🚨 Diagnostic Profile
Make: Acura
Code/Issue Name: Throttle Position Higher Than Expected
Description: This diagnostic trouble condition indicates that the Engine Control Module (ECM) has detected a throttle position sensor (TPS) or Accelerator Pedal Position (APP) sensor voltage reading that is higher than the calculated expected value based on engine load, RPM, and MAP/MAF sensor inputs. This typically points to a mechanical binding issue in the throttle body, a corroded electrical connector, or a failing dual-sensor throttle body assembly common in Acura’s Electronic Throttle Control (ETC) system.
🚨 Repair Difficulty Tier
Difficulty Rating: Intermediate
This repair falls into the Intermediate category. While replacing the throttle body itself is mechanically straightforward, this repair requires a professional-grade OBD-II scanner capable of reading live sensor data (PIDs) for both TPS sensors simultaneously, as well as performing a required Throttle Body Relearn/Idle Reset Procedure post-installation. Attempting to drive the vehicle without this reset can cause rough idle and stalling, so basic bi-directional scan tool access is mandatory.
🛠️ Resolution Steps
Step 1: Preliminary Inspection
Begin by visually inspecting the throttle body housing for excessive carbon buildup, which can cause the throttle plate to stick partially open, sending a false ‘higher than expected’ signal. Check the electrical harness connector at the throttle body for corrosion, bent pins, or melted plastic. Inspect the wiring harness for chafing points near the intake manifold where it may rub against the engine block or firewall.
Step 2: Diagnostic Verification
Connect an OBD-II scan tool capable of live data streaming. Monitor ‘TPS Sensor 1’ and ‘TPS Sensor 2’ voltage outputs simultaneously while manually moving the throttle plate (with the engine off) from idle to wide-open throttle. The two sensors should move in a smooth, inversely proportional, and linear fashion without any voltage dropouts or skips. If the voltage does not match the expected factory range (typically starting around 0.5V at idle), or if there is a discrepancy exceeding manufacturer specs between the two sensors, the throttle body assembly is likely faulty. Additionally, back-probe the connector with a multimeter to verify a stable 5V reference and proper ground signal from the ECM.
Step 3: Resolution & Reset Process
If the sensor readings are erratic or outside spec, replace the complete throttle body assembly (Acura typically requires replacement of the whole unit rather than individual sensors). After installation, use the scan tool to perform the Idle Learn Procedure: turn the ignition to ‘ON’ (engine off) for 2 seconds, start the engine, and let it idle in gear with the A/C on for a specified period until the idle stabilizes. Clear the DTCs and perform a test drive to confirm the ECM correlates both sensor values correctly under load.
📦 Parts, Labor, and Budget Estimates
Required Components/Software: OEM Throttle Body Assembly (with integrated dual TPS sensors), Electrical Contact Cleaner, OBD-II Bi-Directional Scan Tool (for Idle Relearn).
Average Component Price: $250 – $450 (OEM Acura/Honda part); Aftermarket alternatives range from $120 – $200.
Estimated Labor Hours: 0.8 – 1.5 hours (Standard book time for R&R of throttle body, including intake plenum access and idle relearn procedure).