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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.

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 SOLENOID 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
  • Restricted exhaust system
  • Intake air leaks
  • Locked up engine
  • Broken cam chain
  • Fuel contamination
Engine will not start, and HDS does not communicate with the ECM/PCM (MIL comes on and stays on) Troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING ).
  • No power to ECM/PCM
  • No ground to ECM/PCM
  • Short in reference voltage circuit
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 INFORMATION ). -
Engine starts but stalls immediately (MIL works OK, no DTCs set, immobilizer indicator stays on or flashes) Check the immobilizer system (see SYMPTOM TROUBLESHOOTING INFORMATION ).
  • Low compression
  • Intake air leaks
  • Fuel contamination
  • Low fuel pressure
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 CLEANING ).
  • Low compression
  • Intake air leaks
  • Fuel contamination
  • Weak spark
Cold fast idle too low (MIL works OK, no DTCs set)
  1. Do ECM/PCM IDLE LEARN PROCEDURE .
  2. Check the idle speed (see IDLE SPEED INSPECTION ).
  3. Clean the throttle body (see THROTTLE BODY CLEANING ).
  • Incorrect valve adjustment
  • Fuel contamination
Cold fast idle too high (MIL works OK, no DTCs set)
  1. Do ECM/PCM IDLE LEARN PROCEDURE .
  2. Check the idle speed (see IDLE SPEED INSPECTION ).
  3. Do the throttle position learning check (see THROTTLE BODY TEST ).
  • Intake air leaks
  • Incorrect valve adjustment
Idle speed fluctuates (MIL works OK, no DTCs set)
  1. Do ECM/PCM IDLE LEARN PROCEDURE .
  2. Check the idle speed (see IDLE SPEED INSPECTION ).
  3. Do the carbon accumulation check (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 carbon accumulation check (see THROTTLE BODY TEST ).
 -
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 ).
 -
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
  • Fuel contamination
Engine stalls (MIL works OK, no DTCs set)
  1. Do ECM/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
Difficult to refuel (MIL works OK, no DTCs set)
  1. Inspect the breather line and the suction line (see BREATHER LINE AND SUCTION LINE INSPECTION ).
  2. Check the fuel tank vapor control valve hose between the EVAP canister and the fuel tank.
  3. Inspect the fuel filler neck for restrictions.
  4. Replace the fuel tank unit (see FUEL TANK UNIT REMOVAL AND INSTALLATION ).
  5. Replace the fuel tank (see FUEL TANK REPLACEMENT ).
  • Malfunctioning gas station filling nozzle.
  • Faulty fuel tank vapor control valve
Fuel overflows during refueling (No DTCs set)
  1. Inspect the fuel filler neck for restrictions.
  2. Replace the fuel tank unit (see FUEL TANK UNIT REMOVAL AND INSTALLATION ).
  3. 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 FUEL CAP WARNING MESSAGE SYSTEM TROUBLESHOOTING ). EVAP vacuum leak
HDS does not communicate with the ECM/PCM or the vehicle Troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING ). -
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