DTC P0102 or P0103 - LLU
Diagnostic Instructions
DTC Descriptors
DTC P0102 00: Mass Air Flow (MAF) Sensor Circuit
Low Voltage
DTC P0103 00: Mass Air Flow (MAF) Sensor Circuit
High Frequency
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 V 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
• |
The engine is running for greater than
1 s. |
• |
The engine speed is greater than
300 RPM. |
• |
The ignition voltage is greater than
10 V. |
• |
The DTCs run continuously when the above
conditions are met for greater than 1 s. |
Conditions for Setting the DTC
P0102 00
The ECM detects that the MAF sensor signal is less than
900 Hz (0 g/s) for greater than 5 s.
P0103 00
The ECM detects that the MAF sensor signal is greater than
11 000 Hz (179 g/s) for greater than 5 s.
Action Taken When the DTC Sets
DTCs P0102 00 and P0103 00 are Type B
DTCs.
Conditions for Clearing the DTC
DTCs P0102 00 and P0103 00 are Type B
DTCs.
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. |
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 operating at idle, observe the scan tool MAF
Sensor parameter. The reading should be between
1 700-3 200 Hz.
- A wide open throttle (WOT) acceleration from a stop
should cause the MAF sensor parameter on the scan tool to increase
rapidly. This increase should be from 2-6 g/s at idle to
greater than 200 g/s.
- Operate the vehicle within the conditions for running
the DTC to verify the DTC does not reset. You may also operate the
vehicle within the conditions that you observed from the freeze
frame/failure records data.
Circuit/System Testing
- Verify the integrity of the entire air induction
system including all turbocharger components by inspecting for the
following conditions:
• |
Loose or improper installation |
- 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, verify that a test lamp illuminates
between the ignition circuit terminal 4 and ground.
⇒ |
If the test lamp does not illuminate, test the
ignition circuit for a short to ground or an open/high resistance.
If the circuit tests normal and the ignition circuit fuse F16
is open, test all the components connected to the ignition circuit
and replace as necessary. |
- Test for 4.8-5.2 V between the signal circuit
terminal 5 and the ground circuit terminal 2.
⇒ |
If less than the specified range, test the signal
circuit for an open/high resistance or a short to ground. If the
circuit/connections test 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/connections
test 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 B+, and ground the black lead.
- Set the EL 38522 Variable Signal
Generator switch to 5 V, the Frequency switch to 5 K, and
the Duty Cycle switch to Normal.
- Engine Idling, observe the scan tool MAF Sensor
frequency parameter. The parameter should be between
4 950-5 025 Hz.
⇒ |
If the parameter is not within the specified
range, replace the K20 Engine Control Module. |
- If all circuits/connections test normal, replace the
B75B Mass Air Flow/ Inlet Air Temperature Sensor.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|