Handling No Trouble Code Problems
HANDLING NO DTC PROBLEMSSymptom checks cannot be used properly unless the driveability problem characteristic actually happens while the vehicle is being tested.
Select the symptom that most accurately describes the vehicle's driveability problem and then perform the test routine that pertains to this symptom. Perform each routine test in sequence until the problem is found.
SYMPTOM DIAGNOSTIC TEST
Hard Start Checking the Fuel Pressure
Checking Coolant Sensor Calibration
Checking Throttle Position Sensor Calibration
Checking MAP Sensor Calibration
Checking the Minimum Idle Air Flow
Checking EVAP Emission System
Checking IAT Sensor
Engine Stall In Gear Checking TCC Operation
Hesitation/Sag/Stumble Checking PCM Power and Ground Circuit
Checking the Fuel Pressure
Checking Coolant Sensor Calibration
Checking Throttle Position Sensor Calibration
Checking MAP Sensor Calibration
Checking the Minimum Idle Air Flow
Checking Idle Air Control Motor Operation
Checking EVAP Emission System
Surge Checking PCM Power and Ground Circuit
Checking the Fuel Pressure
Checking Coolant Sensor Calibration
Checking Throttle Position Sensor Calibration
Checking MAP Sensor Calibration
Checking the Minimum Idle Air Flow
Checking Idle Air Control Motor Operation
Checking EVAP Emission System
Lack of Power/Sluggish Checking PCM Power and Ground Circuit
Checking the Fuel Pressure
Checking Coolant Sensor Calibration
Checking Throttle Position Sensor Calibration
Checking MAP Sensor Calibration
Checking the Minimum Idle Air Flow
Checking Idle Air Control Motor Operation
Poor Fuel Economy Checking PCM Power and Ground Circuit
Checking the Fuel Pressure
Checking Coolant Sensor Calibration
Checking Throttle Position Sensor Calibration
Checking MAP Sensor Calibration
Checking the Minimum Idle Air Flow
Checking Idle Air Control Motor Operation
Checking EVAP Emission System
Checking IAT Sensor