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Symptom Troubleshooting Index

WARNING: This page is about a different car, the 2011 Honda Pilot, 2010 Honda Pilot, and 2009 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.

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.

TROUBLESHOOTING TABLE

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 ).
  4. Troubleshoot the fuel pump circuit (see FUEL PUMP CIRCUIT TROUBLESHOOTING ).
  • Low compression
  • No ignition spark
  • Intake air leaks
  • Locked up engine
  • Broken timing belt
  • 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
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 SYSTEM CHECK ). -
Engine starts but stalls immediately (MIL works OK, no DTCs set, immobilizer indicator stays on or flashes) Check the immobilizer system (see SYSTEM CHECK ). -
Engine is hard starting (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 CLEANING ).
  • Low compression
  • Intake air leaks
  • Fuel contamination
  • Weak spark
Cold fast idle too low (MIL works OK, no DTCs set)
  1. Do PCM IDLE LEARN PROCEDURE .
  2. Check the idle speed (see IDLE SPEED INSPECTION ).
  3. Clean the throttle body (see THROTTLE BODY CLEANING
 -
Cold fast idle too high (MIL works OK, no DTCs set)
  1. Do PCM IDLE LEARN PROCEDURE .
  2. Check the idle speed (see IDLE SPEED INSPECTION ).
  3. Do THROTTLE POSITION LEARNING CHECK .
 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 carbon accumulation check (see CARBON ACCUMULATION CHECK )
  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 specifications without load (MIL works OK, no DTCs set)
  1. Troubleshoot the alternator FR signal circuit (see ALTERNATOR FR SIGNAL CIRCUIT TROUBLESHOOTING ).
  2. Do the carbon accumulation check (see CARBON ACCUMULATION CHECK ).
 Incorrect valve adjustment
After warming up, idle speed is above specifications 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 ).
 Intake vacuum leaks
After warming up, idle speed drops when steering wheel is turned (MIL works OK, no DTCs set)
  1. Do PCM IDLE LEARN PROCEDURE .
  2. Troubleshoot the PSP switch signal circuit (see PSP SWITCH SIGNAL CIRCUIT TROUBLESHOOTING ).
  3. Do CARBON ACCUMULATION CHECK .
 Power steering system problems
Low power (MIL works OK, no DTCs set) Check the fuel pressure (see FUEL PRESSURE TEST ).
  • Low compression
  • Incorrect camshaft timing
  • Incorrect engine oil level
  • Exhaust restriction
Engine stalls (MIL works OK, no DTCs set)
  1. Do 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
Difficult to refuel (MIL works OK, no DTCs set)
  1. Check the fuel tank vapor control valve hose between the EVAP canister and fuel tank.
  2. Check the fuel tank vapor recirculation tube between the fuel filler pipe and the fuel tank.
  3. Inspect the fuel filler neck for restrictions.
  4. Replace the fuel tank (see FUEL TANK REPLACEMENT ).
 Malfunctioning gas station filling nozzle
Fuel overflows during refueling (No DTCs set)
  1. Inspect the fuel filler neck for restrictions.
  2. Replace the fuel tank (see FUEL TANK REPLACEMENT ).
 Malfunctioning gas station filling nozzle
Fuel cap warning message stays on (MIL works OK, no DTCs set) Troubleshoot the fuel cap warning message system (see DTC P145C: EVAP SYSTEM PURGE FLOW MALFUNCTION ). -
HDS does not communicate with the PCM or the vehicle Troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING ).
  • Correct HDS software
  • Shorted reference voltage
Engine will not crank
  1. Test the battery
  2. Check the starting system (see STARTER SYSTEM CIRCUIT TROUBLESHOOTING ).
 Shorted reference voltage
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