Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.

Ignition - On/Vehicle - In Service Mode
Verify the scan tool parameter: MAP Sensor = Altitude Versus Barometric Pressure - The value should be within the range listed in the table.
- If not in the specified range
  Refer to: DTC P0068, P0101, P0106, P0121, or P1101 (LT1)
- Go to next step: If in the specified range
Ignition/Vehicle - Off
Verify a condition does not exist with the component: Blade@Q38 Throttle Body
- Binding or Sticking@Open/Close - Position
- Coking/Debris/Dirty/Ice/Visible Damage
- Open@Engine Off
- Open/Close - Without spring pressure
- If a condition exists
  Repair as necessary
- Go to next step: If no condition exists
Engine - Idling - At normal operating temperature
Verify the scan tool parameter: Long Term Fuel Trim = -10 to 10%
- If greater than 10%
1. Ignition/Vehicle - Off
2. Verify the following conditions do not exist:
  - A cracked EVAP canister.
  - Air Cleaner Element - Missing
  - Exhaust System - Leaking/Missing components/Restricted - Refer to: Symptoms - Engine Exhaust
  - Fuel - Contaminated/Poor Quality - Refer to: Alcohol/Contaminants-in-Fuel Diagnosis
  - Fuel Injectors - Mechanically stuck/Restricted - Refer to: Fuel Injector Diagnosis
  - Fuel Pressure Low - Refer to: Fuel System Diagnosis
  - Insufficient amount of fuel in the tank.
  - Intake Air Duct - Loose Clamps/Cracked/Visible Damage
  - Intake Manifold - Leaking
  - Mass Airflow Sensor - Contamination of the measuring element/Water intrusion
  - Positive Crankcase Ventilation System - Incorrect connection/Leaking/Restricted - Refer to: Crankcase Ventilation System Inspection/Diagnosis
  - Vacuum Hoses - Incorrect connection/Kinked/Leaking/Restricted
  - If a condition exists - Repair or replace as necessary
  - If no condition exists - Refer to: Symptoms - Engine Mechanical
- If less than -10%
1. Ignition/Vehicle - Off
2. Verify the following conditions do not exist:
  - Air Cleaner Element - Dirty/Restricted/Saturated with water
  - Evaporative Emission (EVAP) System - Saturated with fuel/Missing components/Visible Damage
  - Exhaust System/Catalyst System - Leaking/Missing components/Restricted/Severe discoloration caused by excessive temperatures/Visible Damage - Refer to: Symptoms - Engine Exhaust
  - Fuel - Contaminated/Poor Quality - Refer to: Alcohol/Contaminants-in-Fuel Diagnosis
  - Fuel Injectors - Leaking - Refer to: Fuel Injector Diagnosis
  - Fuel Pressure - High - Refer to: Fuel System Diagnosis
  - Intake Air Duct - Collapsed/Visible Damage
  - MAF Sensor - Contamination of the measuring element
  - Positive Crankcase Ventilation System - Saturated with fuel - Refer to: Crankcase Ventilation System Inspection/Diagnosis
  - If a condition exists - Repair or replace as necessary
  - If no condition exists - Refer to: Symptoms - Engine Mechanical
- Go to next step: If between -10 and 10%
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Verify DTC P0171, P0172, P0174, P0175 is not set.
- If the DTC sets
  Repeat step 4
- Go to next step: If no DTC is set
All OK.

Ignition - On/Vehicle - In Service Mode
Verify the scan tool parameter: MAP Sensor = Altitude Versus Barometric Pressure - The value should be within the range listed in the table.
- If not in the specified range
  Refer to: DTC P0068, P0101, P0106, P0121, P012B, or P1101 (LT4)
- Go to next step: If in the specified range
Ignition/Vehicle - Off
Verify a condition does not exist with the component: Blade@Q38 Throttle Body
- Binding or Sticking@Open/Close - Position
- Coking/Debris/Dirty/Ice/Visible Damage
- Open@Engine Off
- Open/Close - Without spring pressure
- If a condition exists
  Repair as necessary
- Go to next step: If no condition exists
Engine - Idling - At normal operating temperature
Verify the scan tool parameter: Long Term Fuel Trim = -10 to 10%
- If greater than 10%
1. Ignition/Vehicle - Off
2. Verify the following conditions do not exist:
  - A cracked EVAP canister.
  - Air Cleaner Element - Missing
  - Exhaust System - Leaking/Missing components/Restricted - Refer to: Symptoms - Engine Exhaust
  - Fuel - Contaminated/Poor Quality - Refer to: Alcohol/Contaminants-in-Fuel Diagnosis
  - Fuel Injectors - Mechanically stuck/Restricted - Refer to: Fuel Injector Diagnosis
  - Fuel Pressure Low - Refer to: Fuel System Diagnosis
  - Insufficient amount of fuel in the tank.
  - Intake Air Duct - Loose Clamps/Cracked/Visible Damage
  - Intake Manifold - Leaking
  - Mass Airflow Sensor - Contamination of the measuring element/Water intrusion
  - Positive Crankcase Ventilation System - Incorrect connection/Leaking/Restricted - Refer to: Crankcase Ventilation System Inspection/Diagnosis
  - Vacuum Hoses - Incorrect connection/Kinked/Leaking/Restricted
  - If a condition exists - Repair or replace as necessary
  - If no condition exists - Refer to: Symptoms - Engine Mechanical
- If less than -10%
1. Ignition/Vehicle - Off
2. Verify the following conditions do not exist:
  - Air Cleaner Element - Dirty/Restricted/Saturated with water
  - Evaporative Emission (EVAP) System - Saturated with fuel/Missing components/Visible Damage
  - Exhaust System/Catalyst System - Leaking/Missing components/Restricted/Severe discoloration caused by excessive temperatures/Visible Damage - Refer to: Symptoms - Engine Exhaust
  - Fuel - Contaminated/Poor Quality - Refer to: Alcohol/Contaminants-in-Fuel Diagnosis
  - Fuel Injectors - Leaking - Refer to: Fuel Injector Diagnosis
  - Fuel Pressure - High - Refer to: Fuel System Diagnosis
  - Intake Air Duct - Collapsed/Visible Damage
  - MAF Sensor - Contamination of the measuring element
  - Positive Crankcase Ventilation System - Saturated with fuel - Refer to: Crankcase Ventilation System Inspection/Diagnosis
  - If a condition exists - Repair or replace as necessary
  - If no condition exists - Refer to: Symptoms - Engine Mechanical
- Go to next step: If between -10 and 10%
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Verify DTC P0171, P0172, P0174, P0175 is not set.
- If the DTC sets
  Repeat step 4
- Go to next step: If no DTC is set
All OK.