DTC P0068 or P1101 (LDD)
Diagnostic Instructions
DTC Descriptors
| DTC P0068 00: Throttle Body Air Flow
Performance |
| DTC P1101 00: Intake Air Flow System
Performance |
Circuit/System Description
The engine control module (ECM) compares actual airflow based on
throttle position to a calculated airflow based on manifold
absolute pressure (MAP) sensor, and mass air flow (MAF).
Conditions for Running the DTC
P0068 00
| • |
The engine speed is greater
than 800 RPM. |
| • |
The ignition voltage is
greater than 6.0 V. |
| • |
The throttle actuator control
system is not in reduced power mode. |
| • |
DTC P0068 00 run continuously
when the above conditions are met. |
P1101 00
| • |
DTCs P0102 00, P0103 00, P0106
00, P0107 00, P0108 00, P0112 00, P0113 00, P0117 00, P0118 00,
P0335 00, P0336 00 are not set |
| • |
The engine speed is between
400-6 500 RPM |
| • |
The engine coolant temperature
(ECT) sensor is between 70-125°C (158-257°F). |
| • |
The intake air temperature
(IAT) sensor is between -20 to +125°C (-4 to
+257°F). |
| • |
DTC P1101 00 run continuously
when the above conditions are met. |
Conditions for Setting the DTC
The ECM detects that the airflow rate is more than the
calculated airflow for more than 0.2 s.
Action Taken When the DTC Sets
| • |
DTC P0068 00 is a Type A
DTC. |
| • |
DTC P1101 00 is a Type B
DTC. |
Conditions for Clearing the DTC
| • |
DTC P0068 00 is a Type A
DTC |
| • |
DTC P1101 00 is a Type B
DTC. |
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
| 1. |
Verify none of the following
conditions exist: |
| |
• |
The air intake duct system for
loose clamps, cracks, or other damage |
| |
• |
The air intake duct system for
being collapsed or restricted |
| |
• |
The mass airflow sensor is
installed correctly. The arrow indicates direction of airflow and
the tabs of the hoses and notches of the sensor must be aligned.
Refer to
Mass Airflow Sensor Replacement . |
| |
• |
Throttle body for dirt,
debris, and coking |
| |
• |
A damaged throttle body blade
or shaft |
| |
• |
Splits, kinks, or improper
connections at the vacuum hoses |
| |
• |
Vacuum leaks at the intake
manifold, throttle body, and injector O-rings |
| ⇒ |
If a condition exists, repair as necessary. |
| 2. |
Ignition ON, observe the
diagnostic trouble code (DTC) information with a scan tool. Verify
that DTCs P0641 00, P0651 00, P0697 00, or P06A3 00 are not
set. |
| 3. |
Engine idling, observe the MAP
Sensor parameter. The reading should be between 26-52 kPa (3.8-7.5
PSI). |
| ⇒ |
If not within the specified range, refer to
DTC P0106 . |
| 4. |
Use the scan tool snapshot
function to take a snapshot of the engine data list while
performing the actions listed below. |
| |
4.2 |
Increase the engine speed
slowly to 3 000 RPM and then back to idle. |
| |
4.3 |
Exit from the scan tool
snapshot and review the data. |
| |
4.4 |
Observe the mass air flow
(MAF) sensor parameter frame by frame with a scan tool. The MAF
sensor g/s parameter should change smoothly and gradually as the
engine speed is increased and then returned to idle. |
| ⇒ |
If the MAF sensor g/s does not change smoothly and gradually,
refer to
DTC P0101 for further diagnosis. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
