Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2003 Acura RSX Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Diagnostic Trouble Code Definitions

DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION

DTC ⁽¹⁾ (MIL Or "D4" Code) ⁽²⁾

System Affected

Variable Valve Timing Control (VTC) Oil Control Solenoid Valve Malfunction

Variable Valve Timing Control (VTC) System Malfunction

MAP Sensor Low Input Voltage

MAP Sensor High Input Voltage

IAT Sensor Low Input Voltage

IAT Sensor High Input Voltage

Engine Coolant Temperature (ECT) Sensor Range/Performance Problem

Engine Coolant Temperature (ECT) Sensor Low Input Voltage

Engine Coolant Temperature (ECT) Sensor High Input Voltage

Throttle Position (TP) Sensor Low Input Voltage

Throttle Position (TP) Sensor High Input Voltage

Cooling System Malfunction

Air/Fuel Ratio (A/F) Sensor Signal Stuck Lean

Secondary H02S-2 Circuit Low Voltage

Secondary H02S-2 Circuit High Voltage

Secondary H02S-2 Slow Response

Secondary H02S-2 Heater Circuit Malfunction

Fuel System Too Lean

Fuel System Too Rich

Random Misfire Detected

Misfire Cylinder No. 1 Detected

Misfire Cylinder No. 2 Detected

Misfire Cylinder No. 3 Detected

Misfire Cylinder No. 4 Detected

Knock Sensor (KS) Circuit Malfunction

Crankshaft Position (CKP) Sensor No Signal

Crankshaft Position (CKP) Sensor Intermittent Interruption

Camshaft Position (CMP) Sensor No Signal

Variable Valve Timing Control (VTC) Phase Gap

Camshaft Position (CMP) Sensor Intermittent Interruption

Catalyst System Efficiency Below Threshold

Fuel Tank Pressure (FTP) Sensor Circuit Range/Performance Problem

Fuel Tank Pressure (FTP) Sensor Low Voltage

Fuel Tank Pressure (FTP) Sensor High Voltage

⁽³⁾ Vehicle Speed Sensor (VSS) Circuit Malfunction

Idle Control System Malfunction

ECM/PCM Power Source Circuit Unexpected Voltage

P0600 (39)

⁽⁴⁾ Serial Communication Link Malfunction

Intake Manifold Runner Control (IMRC) Valve Position Sensor Circuit Low Voltage

Intake Manifold Runner Control (IMRC) Valve Position Sensor Circuit High Voltage

P0700 (70)

⁽⁵⁾ Automatic Transaxle

P0715 (70)

⁽⁵⁾ Automatic Transaxle

P0720 (70)

⁽⁵⁾ Automatic Transaxle

P0730 (70)

⁽⁵⁾ Automatic Transaxle

P0740 (70)

⁽⁵⁾ Automatic Transaxle

P0753 (70)

⁽⁵⁾ Automatic Transaxle

P0758 (70)

⁽⁵⁾ Automatic Transaxle

Intake Manifold Runner Control (IMRC) System Malfunction (Low RPM)

Intake Manifold Runner Control (IMRC) System Malfunction (High RPM)

Barometric Pressure (BARO) Circuit Range/Performance

Barometric Pressure (BARO) Circuit Low Input Voltage

Barometric Pressure (BARO) Circuit High Input Voltage

Throttle Position (TP) Sensor Signal Lower Than Expected

Throttle Position (TP) Sensor Signal Higher Than Expected

Manifold Absolute Pressure (MAP) Sensor Signal Lower Than Expected

Manifold Absolute Pressure (MAP) Sensor Signal Higher Than Expected

Air/Fuel Ratio (A/F) Sensor Circuit Malfunction

Air/Fuel Ratio (A/F) Sensor Slow Response

Air/Fuel Ratio (A/F) Sensor Range/Performance Problem

Air/Fuel Ratio (A/F) Sensor Heater Circuit Malfunction

Air/Fuel Ratio (A/F) Sensor Heater System Malfunction

Variable Valve Timing & Lift Electronic Control (VTEC) System Malfunction

Electrical Load Detector (ELD) Circuit Low Input Voltage

Electrical Load Detector (ELD) Circuit High Input Voltage

Top Dead Center (TDC) Sensor Intermittent Interruption

Top Dead Center (TDC) Sensor No Signal

Evaporative Emission Control System (EVAP) Leak Detected

Evaporative Emission Control System (EVAP) Leak Detected

Idle Air Control (IAC) Valve Circuit Malfunction

Power Control Module (PCM) Internal Malfunction

P1705 (70)

⁽⁵⁾ Automatic Transaxle

P1706 (70)

⁽⁵⁾ Automatic Transaxle

P1753 (70)

⁽⁵⁾ Automatic Transaxle

P1758 (70)

⁽⁵⁾ Automatic Transaxle

P1768 (70)

⁽⁵⁾ Automatic Transaxle

⁽¹⁾	Diagnostic Trouble Code (DTC) retrieved using Honda PGM Tester or OBD-II scan tool.

⁽²⁾	Diagnostic Trouble Code (DTC) retrieved from Malfunction Indicator Light (MIL) (engine controls) or Automatic Transaxle (A/T) position "D4" indicator (A/T controls) flashes when SCS service connector is connected.

⁽³⁾	Manual Transaxle Only.

⁽⁴⁾	See appropriate MULTIPLEX CONTROL SYSTEMS article in ACCESSORIES & EQUIPMENT.

⁽⁵⁾	See appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.

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