- Staff
- #21
- Joined
- Oct 21, 2006
- Messages
- 48,004
- Reaction score
- 32,148
- Location
- Edmonton/Sherwood Park
- Website
- www.bumpertobumper.ca
[h=3]Diagnostic Instructions[/h]
[h=3]Diagnostic Fault Information[/h]
[h=3]Circuit/System Description[/h]For an overview of the component/system, refer to: Intake Airflow Valve System Description
[h=3]Conditions for Running the DTC[/h]
[h=3]Conditions for Setting the DTC[/h]Intake Air Flow Valve Learned Closed Position ≠ 4.3 to 4.6 V
[h=3]Actions Taken When the DTC Sets[/h]DTCs listed in the DTC Descriptor Category = Type A DTC — Additional actions taken:
[h=3]Diagnostic Aids[/h]
Engine Controls Schematics
Connector End View Reference
Master Electrical Component List
Electrical Information Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
[h=3]Circuit/System Verification[/h]
- Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle
- Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis
- An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions
[h=3]Diagnostic Fault Information[/h]
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| Control — Terminal 1 | P122C | P02E0 | P122C, P122D | P02E4, P02E5 |
| Control — Terminal 2 | P122C | P02E0 | P122C, P122D | P02E4, P02E5 |
[h=3]Circuit/System Description[/h]For an overview of the component/system, refer to: Intake Airflow Valve System Description
| Circuit | Description |
| Control — Terminal 1 | The output circuit is switched from ground to 12 V to activate the component. The output is PWM controlled. |
| Control — Terminal 2 | The output circuit is switched from ground to 12 V to activate the component. The output is PWM controlled. |
| Component | Description |
| K20 Engine Control Module | The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the engine actuators accordingly. |
| Q20 Intake Air Flow Valve | The intake air flow valve of diesel engines reduces the intake air flow rate in part load operation so that a higher exhaust gas recirculation rate can be achieved. The component is actuated by a bidirectional DC motor. Not Activated = Open |
[h=3]Conditions for Running the DTC[/h]
- DTC P0071–P0074, P0116–P0119, P02E0–P02E5, P02E8, P02E9, P02EB, P0651, P122B, P122C, P16A0–P16A2 = Not set
- Ambient Air Temperature = Warmer than 49°C (120°F)
- Engine Coolant Temperature = 50 to 150°C (122 to 302°F)
- Ignition Key = Off
- Ignition Voltage = Greater than 10 V
- Intake Air Flow Valve Motor Command = Learning — Complete
[h=3]Conditions for Setting the DTC[/h]Intake Air Flow Valve Learned Closed Position ≠ 4.3 to 4.6 V
[h=3]Actions Taken When the DTC Sets[/h]DTCs listed in the DTC Descriptor Category = Type A DTC — Additional actions taken:
- Reduced Engine Power = Active
- P16 Instrument Cluster = Reduced Engine Power
[h=3]Diagnostic Aids[/h]
- Certain weather conditions during prolonged trips may cause ice to form in the area of the component: Q20 Intake Air Flow Valve
- If ice is found in the area of the component Q20, clean and dry the component and retest to verify the issue has been corrected.
Engine Controls Schematics
Connector End View Reference
Master Electrical Component List
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
[h=3]Circuit/System Verification[/h]
- Ignition » On / Vehicle » In Service Mode
- Verify DTC P02E0–P02E5, P02E8, P02E9, P02EB, P122B, P122C, P16A0–P16A2 is not set.
- If the DTC is set
Refer to: Diagnostic Trouble Code (DTC) List - Vehicle
- If the DTC is not set
- If the DTC is set
- Clear the DTCs.
- Ignition Off » For greater than 1 min
- Ignition » On / Vehicle » In Service Mode
- Verify DTC P122D is not set.
- If the DTC sets
- Ignition/Vehicle » Off
- Verify the following conditions do not exist: Blade @ Q20 Intake Air Flow Valve
- Warning: Turn OFF the ignition before inserting fingers into the throttle bore. Unexpected movement of the throttle blade could cause personal injury.
- Binding or Sticking @ Open/Close — Position
- Closed @ Engine Off
- Coking / Debris / Dirty / Visible Damage
- Open/Close — Without spring pressure
- Water intrusion — Ice
Refer to: Diagnostic Aids
- If a condition exists » Repair or replace as necessary
- Warning: Turn OFF the ignition before inserting fingers into the throttle bore. Unexpected movement of the throttle blade could cause personal injury.
- If the DTC does not set
- 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 the DTC does not set.
- If the DTC sets
Repeat step 2
- If the DTC does not set
- If the DTC sets
- All OK.
- Throttle Body Assembly Replacement — Q20 Intake Air Flow Valve
- For control module replacement, programming, and setup refer to: Control Module References
