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Home >> Pontiac >> 2007 >> Vibe Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - DTC P0010 To DTC P0128 >> DTC P0102 >> Test Description
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Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 1:  The Diagnostic System Check - Vehicle prompts the technician to complete some basic checks and store the Freeze Frame data on the scan tool, if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.
  2. 2:  This step checks for a low input signal from the MAF sensor.
  3. 5:  This step is looking for MAF sensor output on the MAF signal high circuit. Air movement around the sensor's hot wire element can cause some fluctuation in the voltage being measured.
  4. 8:  This step tests for a short to ground in the MAF signal high circuit. If the test lamp illuminates, there is a short to ground in the circuit or PCM. If the test lamp does not illuminate, the circuit may be OK or may have an open.
DTC P0102

Step Action Values Yes No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views
1  Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2  Select the MAF sensor parameter on the scan tool.
Is the MAF sensor less than or equal to the specified value?		 0.45 g/s Go to Step 4  Go to Step 3 
3
  1. Clear the DTC Information with the scan tool.
  2. Operate the vehicle within the Freeze Frame conditions as specified.
Does a DTC P0102 set?		 - Go to Step 4  Go to Intermittent Conditions
4
  1. Turn OFF the ignition.
  2. Disconnect the mass air flow (MAF) sensor electrical connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the ignition positive voltage circuit with a test lamp connected to ground.
Is the test lamp illuminated?		 - Go to Step 5  Go to Step 6 
5 
  1. Turn OFF the ignition.
  2. Connect the MAF sensor electrical connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Backprobe the MAF signal high circuit at the powertrain control module (PCM) with a DMM connected to ground.
Is the MAF signal high voltage within the specified range?		 0.5-3 V Go to Step 7  Go to Step 8 
6 Repair the open in the MAF sensor ignition positive voltage circuit. Refer to Wiring Repairs .
Did you complete the repair?		 - Go to Step 15  -
7
  1. Remove the MAF sensor from the air cleaner housing. Refer to Mass Airflow Sensor Replacement .
  2. Continue to backprobe the MAF signal high circuit at the PCM with the DMM.
  3. Observe the voltage on the MAF signal high circuit while blowing gently into the MAF sensor orifice.
Did the signal high circuit voltage increase when blowing air into the sensor orifice?		 - Go to Step 11  Go to Step 12 
8 
  1. Turn OFF the ignition.
  2. Disconnect the MAF sensor electrical connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the MAF signal high circuit with a test lamp connected to B+.
Is the test lamp illuminated?		 - Go to Step 10  Go to Step 9 
9
  1. Test for an open in the MAF signal high circuit.
  2. Repair as necessary. Refer to Wiring Repairs .
Did you find and correct a condition?		 - Go to Step 15  Go to Step 12 
10
  1. Test for a short to ground in the MAF signal high circuit.
  2. Repair as necessary. Refer to Wiring Repairs .
Did you find and correct a condition?		 - Go to Step 15  Go to Step 14 
11
  1. Test for an intermittent or a poor electrical connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
  2. Repair as necessary. Refer to Wiring Repairs .
Did you find and correct a condition?		 - Go to Step 15  Go to Step 14 
12
  1. Test for an intermittent or a poor electrical connection at the MAF sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
  2. Repair as necessary. Refer to Wiring Repairs .
Did you find and correct a condition?		 - Go to Step 15  Go to Step 13 
13 Replace the MAF sensor. Refer to Mass Airflow Sensor Replacement .
Did you complete the replacement?		 - Go to Step 15  -
14 Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 15  -
15
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC run and pass?		 - Go to Step 16  Go to Step 2 
16 With a scan tool, observe the stored information, Capture Info.
Does the scan tool display any DTCs that you have not diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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