DTC P0101 - LUJ
Diagnostic Instructions
DTC Descriptor
DTC P0101 00 : Mass Air Flow (MAF) Sensor
Performance
Diagnostic Fault Information
|
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
|
Ignition 1 Voltage
|
P0030 00, P0036 00, P0102 00, P0135 00,
P0141 00, P0443 00, P0597 00, P0598 00
|
P0101 00, P0102 00
|
-
|
P0101 00, P0103 00
|
|
MAF Sensor Signal
|
P0102 00
|
P0102 00
|
P0102 00
|
P0068 00, P0101 00, P0103 00, P1101 00
|
|
Ground
|
-
|
P0102 00
|
-
|
P0102 00
|
Typical Scan Tool Data
MAF Sensor
|
Circuit
|
Short to Ground
|
Open
|
Short to Voltage
|
|
Operating Conditions: Engine running
at various operating conditions
Parameter Normal Range:
1 700-2 100 Hz at idle
|
|
Ignition Voltage
|
0 Hz
|
0 Hz
|
-
|
|
MAF Sensor Signal
|
0 Hz
|
0 Hz
|
0 Hz
|
|
Ground
|
-
|
0 Hz
|
-
|
Circuit/System Description
The mass air flow (MAF) sensor is integrated with the inlet
air temperature (IAT) sensor. The MAF sensor is an air flow
meter that measures the amount of air entering the engine. The
engine control module (ECM) uses the MAF sensor signal to
provide the correct fuel delivery for all engine speeds and loads.
A small quantity of air entering the engine indicates a
deceleration or idle condition. A large quantity of air entering
the engine indicates an acceleration or high load condition.
The ECM applies 5 volts to the MAF sensor on the MAF sensor
signal circuit. The sensor uses the voltage to produce a frequency
based on the inlet air flow through the sensor bore.
Conditions for Running the DTC
| • |
DTCsP0102 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 IAT sensor is between -20 to
+125°C (-4 to +257°F). |
| • |
The engine coolant temperature (ECT) is
between 70-125°C (158-257°F). |
| • |
The DTC runs continuously when the above
conditions are met. |
Conditions for Setting the DTC
The ECM detects that the MAF sensor signal is not within a
predetermined range of the calculated MAF value.
Action Taken When the DTC Sets
DTC P0101 00 is a Type B DTC.
Conditions for Clearing the DTC
DTC P0101 00 is a Type B DTC.
Diagnostic Aids
| • |
Inspect the harness of the MAF sensor to verify
that it is not routed too close to the following components: |
| • |
Inspect for any contamination, water intrusion, or
debris on the sensing elements of the MAF sensor. If debris is
present, clean the sensor. If the sensor cannot be cleaned, replace
the sensor. |
| - |
A high resistance may cause a driveability concern
before this DTC sets. |
| - |
A MAF sensor that is installed incorrectly may set
this DTC. |
| - |
Certain aftermarket air filters may cause this DTC
to set. |
| - |
Certain aftermarket air induction systems may
cause this DTC to set. |
| - |
Modifications to the air induction system may
cause this DTC to set. |
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
Special Tools
EL 38522 Variable Signal Generator
For equivalent regional tools, refer to
Special Tools .
Circuit/System Verification
- Engine idling, observe the DTC information with a scan
tool. DTC P0101 00 should not set.
- Verify the scan tool MAF Sensor Hz parameter is
between 1 700-2 100 Hz.
- 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.
Circuit/System Testing
- Inspect for the following conditions:
| • |
An air leak in the inlet air duct between the mass
air flow (MAF) sensor and the throttle body |
| • |
Objects that block the MAF sensor air inlet |
| • |
An air filter element that is restricted |
| • |
A restricted throttle plate or for carbon build-up
around the throttle plate |
| • |
An unseated engine oil dip stick |
| • |
A loose or missing engine oil fill cap |
| • |
An over filled crankcase |
| ⇒ |
If you find any of the above conditions, repair as
necessary. |
- Ignition OFF, disconnect the harness connector at the
B75B Mass Air Flow/Intake Air Temperature Sensor.
- Ignition OFF for 90 s, test for less than
5 Ω between the ground circuit terminal 2 and
ground.
| ⇒ |
If greater than the specified range, test the
ground circuit for an open/high resistance. |
- Ignition ON, test for B+ between the ignition voltage
circuit terminal 4 and ground.
| ⇒ |
If less than the specified range, test the
ignition voltage circuit for a short to ground or an open/high
resistance. |
- Ignition On, test for 4.8-5.2 V between the
signal circuit terminal 5 and ground.
| ⇒ |
If less than the specified range, test the signal
circuit for a short to ground or an open/high resistance. If the
circuit tests normal, replace the K20 Engine Control
Module. |
| ⇒ |
If greater than the specified range, test the
signal circuit for a short to voltage. If the circuit tests normal,
replace the K20 Engine Control Module. |
- Ignition OFF, connect the red lead of the
EL 38522 Variable Signal Generator to the signal
circuit terminal 5 at the B75B Mass Air Flow/Intake Air
Temperature Sensor harness connector. Connect the battery voltage
supply to the B+, and ground the black lead.
- Set the EL 38522 Variable Signal
Generator to the following specifications signal switch to
5 V, the Frequency switch to 5 K, and the duty cycle
switch to normal.
| • |
Frequency switch to 5 KHz |
| • |
Duty Cycle switch to Normal |
Note: The engine will run rough
and may stall.
- Engine idling, observe the scan tool MAF Sensor Hz
parameter. The scan tool MAF Sensor parameter should be between
4 950-5 025 Hz.
| ⇒ |
If the MAF Sensor parameter is not within the
specified range, replace the K20 Engine Control Module. |
- If all other circuits test normal, test or replace the
B75B Mass Air Flow/Inlet Air Temperature Sensor.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the repair.
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