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Home >> Acura >> 2011 >> RDX 2.3 TB1 >> Repair and Diagnosis >> Engine Performance >> System >> Fuel And Emissions Systems >> Symptom Troubleshooting Index

Symptom Troubleshooting Index

When the vehicle has one of these symptoms, check for a diagnostic trouble code (DTC) with the HDS. If there is no DTC, do the diagnostic procedure for the symptom, in the sequence listed, until you find the cause.

Symptom Diagnostic procedure Also check for
Engine will not start (MIL works OK, no DTCs set)
  1. Test the battery (see BATTERY TEST ).
  2. Test the starter (see STARTER PERFORMANCE TEST ).
  3. Check the fuel pressure (see FUEL PRESSURE TEST ).
  • Low compression
  • No ignition spark
  • Intake air leaks
  • Locked up engine
  • Broken cam chain
  • Fuel contamination
Engine will not start (MIL comes on and stays on, no DTCs set) Troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING ).
  • No power to PCM
  • No ground to PCM
  • Shorted reference voltage
MIL comes on and stays on, or never comes on at all, no DTCs set Troubleshoot the MIL circuit (see MIL CIRCUIT TROUBLESHOOTING ).  
Engine will not start (MIL works OK, no DTCs set, immobilizer indicator stays on or flashes) Check the immobilizer system (see SYMPTOM TROUBLESHOOTING INDEX ).  
Engine starts but stalls immediately (MIL works OK, no DTCs set, immobilizer indicator stays on or flashes) Check the immobilizer system (see SYMPTOM TROUBLESHOOTING INDEX ).  
Engine is hard to start (MIL works OK, no DTCs set)
  1. Test the battery (see BATTERY TEST ).
  2. Check the fuel pressure (see FUEL PRESSURE TEST ).
  3. Clean the throttle body (see THROTTLE BODY TEST ).
  • Low compression
  • Intake air leaks
  • Fuel contamination
  • Weak spark
Cold fast idle too low (MIL works OK, no DTCs set)
  1. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  2. Check the idle speed (see IDLE SPEED INSPECTION ).
  3. Clean the throttle body (see THROTTLE BODY TEST ).
  
Cold fast idle too high (MIL works OK, no DTCs set)
  1. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  2. Check the idle speed (see IDLE SPEED INSPECTION ).
  3. Test the throttle body (see THROTTLE BODY TEST ).
 Intake air leaks
Idle speed fluctuates (MIL works OK, no DTCs set)
  1. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  2. Check the idle speed (see IDLE SPEED INSPECTION ).
  3. Do the throttle body test (see THROTTLE BODY TEST ).
  4. Troubleshoot the A/C signal circuit (see A/C SIGNAL CIRCUIT TROUBLESHOOTING ).
  • Incorrect valve timing or clearance adjustment
  • Intake air leaks
After warming up, idle speed is below specification without load (MIL works OK, no DTCs set)
  1. Troubleshoot the alternator FR signal circuit (see ALTERNATOR FR SIGNAL CIRCUIT TROUBLESHOOTING ).
  2. Do the throttle body test (see THROTTLE BODY TESTTHROTTLE BODY TEST ).
  3. Troubleshoot the A/C signal circuit (see A/C SIGNAL CIRCUIT TROUBLESHOOTING ).
 Incorrect valve adjustment
After warming up, idle speed is above specification without load (MIL works OK, no DTCs set)
  1. Troubleshoot the alternator FR signal circuit (see ALTERNATOR FR SIGNAL CIRCUIT TROUBLESHOOTING ).
  2. Inspect the APP sensor (see APP SENSOR SIGNAL INSPECTION ).
  3. Troubleshoot the A/C signal circuit (see A/C SIGNAL CIRCUIT TROUBLESHOOTING ).
 Vacuum leaks
After warming up, idle speed drops when steering wheel is turned (MIL works OK, no DTCs set)
  1. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  2. Troubleshoot the PSP switch signal circuit (see ALTERNATOR FR SIGNAL CIRCUIT TROUBLESHOOTING ).
  3. Do the throttle body test (see THROTTLE BODY TEST ).
 Power steering system problems
Low power (MIL works OK, no DTCs set)
  1. Check the fuel pressure (see FUEL PRESSURE TEST ).
  2. Check the turbocharger wastegate control solenoid valve (see TURBOCHARGER BYPASS CONTROL SOLENOID VALVE REPLACEMENT ).
  3. Check the turbocharger wastegate control actuator control line.
  4. Check the turbocharger wastegate control actuator (see TURBOCHARGER CONTROL SYSTEM DIAGRAM  ).
  5. Check the turbocharger boost control solenoid valve (see TURBOCHARGER BOOST CONTROL SOLENOID VALVE INSPECTION ).
  6. Check the turbocharger boost control actuator control line.
  7. Check the turbocharger boost control actuator.
  8. Check the turbocharger bypass control solenoid valve (see TURBOCHARGER BYPASS CONTROL SOLENOID VALVE INSPECTION ).
  9. Check the turbocharger bypass control valve control line.
  10. Check the turbocharger bypass control valve (see TURBOCHARGER BYPASS CONTROL VALVE REPLACEMENT ).
  • Low compression
  • Incorrect camshaft timing
  • Incorrect engine oil level
  • Turbocharger wastegate control actuator stuck open
  • Turbocharger boost control actuator stuck open
  • Turbocharger bypass control valve stuck closed
  • Turbocharger bypass control valve stuck open
Engine stalls (MIL works OK, no DTCs set)
  1. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  2. Check the fuel pressure (see FUEL PRESSURE TEST ).
  3. Check the idle speed (see IDLE SPEED INSPECTION ).
  4. Troubleshoot the brake pedal position switch signal circuit (see BRAKE PEDAL POSITION SWITCH SIGNAL CIRCUIT TROUBLESHOOTING ).
  • Intake air leaks
  • Faulty harness and sensor connections
  • Fuel contamination
Abnormal sound during deceleration with fuel cut (MIL works OK, no DTCs set)
  1. Check the turbocharger bypass control solenoid valve (see TURBOCHARGER BYPASS CONTROL SOLENOID VALVE INSPECTION ).
  2. Check the turbocharger bypass control valve control line.
  3. Check the turbocharger bypass control valve (see TURBOCHARGER BYPASS CONTROL VALVE REPLACEMENT ).
 Turbocharger bypass control valve stuck closed
Fuel cut happens during acceleration between 4, 000-5, 000 RPM (MIL works OK, no DTCs set)
  1. Check the turbocharger wastegate control solenoid valve (see TURBOCHARGER BYPASS CONTROL SOLENOID VALVE REPLACEMENT ).
  2. Check the turbocharger wastegate control actuator control line.
  3. Check the turbocharger wastegate control actuator (see TURBOCHARGER CONTROL SYSTEM DIAGRAM  ).
 Turbocharger wastegate control actuator stuck closed
Difficult to refuel (MIL works OK, no DTCs set)
  1. Check the fuel vent tube between the EVAP canister and the fuel tank.
  2. Check the fuel tank vapor recirculation tube between the fuel pipe and the fuel tank.
  3. Replace the fuel tank unit (see FUEL TANK UNIT REMOVAL AND INSTALLATION ).
  4. Replace the fuel tank (see FUEL TANK REPLACEMENT ).
 Malfunctioning gas station filling nozzle.
Fuel overflows during refueling (No DTCs set)
  1. Replace the fuel tank unit (see FUEL TANK UNIT REMOVAL AND INSTALLATION ).
  2. Replace the fuel tank (see FUEL TANK REPLACEMENT ).
 Malfunctioning gas station filling nozzle.
HDS does not communicate with the PCM or the vehicle Troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING ). Correct HDS software
Fuel cap warning message stays on (MIL works OK, no DTCs set) Troubleshoot the fuel cap warning message system (see FUEL CAP WARNING MESSAGE SYSTEM TROUBLESHOOTING ).  
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