Buick Regal: DTC P0068 or P1101
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
- Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
DTC Descriptor
DTC P0068
Throttle Body Air Flow Performance
DTC P1101
Intake Air Flow System Performance
Circuit/System Description
The engine control module (ECM) compares actual air flow based on throttle
position (TP) to a
calculated airflow based on manifold absolute pressure (MAP) sensor, and mass
air flow (MAF).
Conditions for Running the DTC
DTC P0068
- The engine speed is at least 800 RPM.
- The ignition voltage is at least 6.4 V.
- The DTC runs continuously when the above conditions are met.
DTC P1101
- DTC P0101, P0102, P0103, P0107, P0108, P0111, P0112, P0113, P0116,
P0117, P0118, P0128,
P0335, or P0336 is not set
- The engine speed is between 575 - 6, 600 RPM
- The engine coolant temperature (ECT) is between -7 to +129ºC (+19 to
+264ºF).
- The intake air temperature (IAT) is between -20 to +125ºC (-4 to
+257ºF).
- The DTC runs continuously when the above conditions are met.
Conditions for Setting the DTCs
The ECM detects that the actual airflow rate is greater than the calculated
airflow.
Action Taken When the DTCs Set
- DTC P0068 is a type A DTC.
- DTC P1101 is a type B DTC.
Conditions for Clearing the DTCs
- DTC P0068 is a type A DTC.
- DTC P1101 is a type B DTC.
Reference Information
Schematic Reference
Engine Controls Wiring Schematics (LTG)
Connector End View Reference
Component Connector End View Index
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Powertrain Component Views
Powertrain Component Views
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON, verify that DTC P0641, P0651, P0697, or P06A3 is not set.
- If any of the DTCs are set
- Go to next step: If none of the DTCs are set
2. If you were sent here from DTC P0068, P0106, P0121, P0236, or P1101; refer
to Circuit/System
Testing.
3. Ignition ON, verify the scan tool Throttle Body Idle Air Flow Compensation
parameter is less
than 90 %.
- 90 % or greater
- Go to next step: If less than 90 %
4. Verify the scan tool Throttle Position Sensors 1 and 2 Agree/Disagree
parameter displays Agree
while performing the Throttle Sweep Test with a scan tool.
- If Disagree
- Go to next step: If Agree
5. Determine the current vehicle testing altitude.
6. Verify the scan tool MAP Sensor pressure parameter is within the range
specified in the Altitude
Versus Barometric Pressure table.
- If the MAP Sensor parameter is not in range
Refer to DTC P0106 for further diagnosis.
- Go to next step: If the MAP Sensor parameter is within range
7. Verify the engine is equipped with a turbocharger.
- If not equipped with a turbocharger
Refer to Step 10.
- Go to next step: If equipped with a turbocharger
8. Verify the scan tool Boost Pressure Sensor parameter is within the range
specified in the Altitude
Versus Barometric Pressure table.
- If the Boost Pressure Sensor parameter is not in range
Refer to DTC P0236 for further diagnosis.
- Go to next step: If the Boost Pressure Sensor parameter is within
range
9. Verify the scan tool Boost Pressure Sensor parameter decreases after
starting the engine.
- If the Boost Pressure Sensor parameter does not decrease
Refer to DTC P0236 for further diagnosis.
Go to next step: If the Boost Pressure Sensor parameter does decrease
10. Engine idling, verify the scan tool MAP Sensor pressure parameter is
between 26 - 52 kPa (3.8 -
7.5 PSI) and changes with accelerator pedal input.
- If not between 26 - 52 kPa (3.8 - 7.5 PSI) or does not change
Refer to DTC P0106 for further diagnosis.
- Go to next step: If between 26 - 52 kPa (3.8 - 7.5 PSI) and changes
11. Verify the scan tool MAF Sensor g/s parameter changes smoothly and
gradually as the engine
speed is increased and decreased while performing the actions listed below.
- Engine idling
- Perform the scan tool snapshot function.
- Increase the engine speed slowly to 3, 000 RPM and then back to idle.
- Exit from the scan tool snapshot and review the data.
- Observe the MAF Sensor parameter frame by frame with a scan tool.
- If the MAF Sensor parameter does not change smoothly and gradually
Refer to DTC P0101 for further diagnosis.
- Go to next step: If the MAF Sensor parameter changes smoothly and
gradually
12. 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.
13. Verify the DTC does not set.
Refer to Circuit/System Testing.
- Go to next step: If the DTC does not set
14. All OK
Circuit/System Testing
NOTE: You must perform the Circuit/System Verification before
proceeding with
Circuit/System Testing.
1. Verify the integrity of the entire air induction system by verifying that
none of the following
conditions exist:
- Any damaged, improperly installed, collapsed, or restricted components
- Improper operation of turbocharger wastegate actuator or bypass valve,
where equipped
- Loose clamps, cracks, or other damage
- An air flow restriction
- Restricted air filter
- Splits, kinks, leaks, or improper connections at the vacuum hoses
- Vacuum leaks at the intake manifold, MAP sensor, and throttle body
- Water intrusion
- Any snow or ice buildup, in cold climates
- Contamination of the MAF sensor element
- Missing, restricted, or leaking exhaust components - Refer to Symptoms -
Engine Exhaust
for further diagnosis.
- If a condition is found
Repair or replace component as appropriate.
- Go to next step: If no condition is found
2. Test the engine for a mechanical condition. Refer to Symptoms - Engine
Mechanical for
diagnosis.
Repair or replace component as appropriate.
- Go to next step: If no condition is found
3. All OK
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for engine control module replacement, programming,
and setup
READ NEXT:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
SEE MORE:
Warning:
Never leave a child, a helpless
adult, or a pet alone in a vehicle,
especially with the windows
closed in warm or hot weather.
They can be overcome by the
extreme heat and suffer
permanent injuries or even death
from heat stroke.
The vehicle aerodynamics are
designed to improve fuel econo
The Electric Parking Brake (EPB)
can always be activated, even if the
ignition is off. To prevent draining
the battery, avoid repeated cycles of
the EPB when the engine is not
running.
The system has a red parking brake
status light and an amber parking
brake warning light. There are also
parking