DTC P0102 or P0103 (LDD)
Diagnostic Instructions
DTC Descriptors
| DTC P0102 00: Mass Air Flow (MAF) Sensor
Circuit Low Frequency |
| 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 intake 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
| 1. |
Engine idling, observe the DTC
information with a scan tool. DTC P0102 00 or P0103 00 should not
set. |
| 2. |
Verify the scan tool MAF
sensor parameter is between 1.7-3.7 g/s. |
| 3. |
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
| 1. |
Ignition OFF, disconnect the
harness connector at the B75B Mass Air Flow/Intake Air Temperature
Sensor. |
| 2. |
Ignition OFF, test for less
than 5 Ω between the earth circuit terminal 2 and
earth. |
| ⇒ |
If greater than the specified range, repair the
ground circuit for an open/high resistance. |
| 3. |
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. |
| 4. |
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. |
| 5. |
Ignition OFF, connect the red
lead of the EL 38522 Variable Signal Alternator to
the signal circuit terminal 5 at the MAF/IAT sensor harness
connector. Connect the battery voltage supply to B+, and ground the
black lead. |
| 6. |
Set the EL 38522
Variable Signal Alternator to the following
specifications: |
| |
• |
Frequency switch to 5
KHz |
|
Note: The engine will run
rough and may stall.
|
| |
|
|
| |
• |
Duty Cycle switch to
normal |
| 7. |
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 not within the specified range, replace the K20
Engine Control Module. |
| 8. |
If the circuits test normal,
replace the B75B Mass Air Flow/Intake Air Temperature
Sensor. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
