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Test Description

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

  1. 5:  This step tests the MAP sensors ability to correctly indicate barometric pressure.
  2. 7:  This step tests the MAP sensors ability to respond to an increase in engine vacuum.
  3. 9:  This step tests for a proper MAP sensor pressure with an applied vacuum.
  4. 14:  This step calculates the resistance in the 5-volt reference circuit.
  5. 15:  This step calculates the resistance in the low reference circuit.
DTC P0106

Step Action Values Yes No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls Connector End Views or Powertrain Control Module (PCM) Connector End Views
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 Are DTCs P0107 or P0108 set? - Go to Diagnostic Trouble Code (DTC) List - Vehicle Go to Step 3 
3 Inspect for the following conditions:
  • A disconnected, damaged, or incorrectly routed vacuum hose
  • A missing or damaged manifold absolute pressure (MAP) sensor seal
  • Any restrictions in the MAP sensor vacuum source
  • Any vacuum leaks in the intake manifold

Did you find and correct the condition?		 - Go to Step 22  Go to Step 4 
4
IMPORTANT: The vehicle used for the comparison is not limited to the same type of vehicle as is being serviced. A vehicle known to provide an accurate reading is acceptable.
Do you have access to another vehicle in which the MAP sensor pressure can be observed with a scan tool?		 - Go to Step 5  Go to Step 6 
5 
  1. Turn ON the ignition, with the engine OFF.
  2. Observe the MAP sensor pressure with the scan tool.
  3. Observe the MAP sensor pressure in the known good vehicle with the scan tool.
  4. Compare the values.
Is the difference between the values less than the specified value?		 3 kPa Go to Step 7  Go to Step 12 
6
IMPORTANT: The Altitude vs. Barometric Pressure table indicates a pressure range for a given altitude under normal weather conditions. Weather conditions consisting of very low or very high pressure and/or very low or very high temperature may cause a reading to be slightly out of range.
  1. Turn ON the ignition, with the engine OFF.
  2. Observe the MAP sensor pressure with the scan tool. Refer to Altitude vs Barometric Pressure .
  3. The MAP sensor pressure should be within the range specified for your altitude.
Does the MAP sensor indicate the correct barometric pressure?		 - Go to Step 7  Go to Step 12 
7 
  1. Observe the MAP sensor pressure with the scan tool.
  2. Start the engine.
Does the MAP sensor pressure change?		 - Go to Step 8  Go to Step 12 
8
  1. Turn OFF the ignition.
  2. Remove the MAP sensor from the intake manifold. Leave the MAP sensor connected to the electrical harness.
  3. Connect a pump J 23738-A  Mityvac to the MAP sensor port.
  4. Turn ON the ignition, with the engine OFF.
  5. Observe the MAP sensor pressure with the scan tool.
  6. Apply vacuum to the MAP sensor with the J 23738-A  in 1 inch Hg increments until 15 inch Hg is reached. Each 1 inch Hg should decrease the MAP sensor pressure by 3-4 kPa.
Is the decrease in MAP sensor pressure consistent?		 - Go to Step 9  Go to Step 12 
9 
  1. Observe the MAP sensor pressure with the scan tool.
  2. Apply vacuum with the J 23738-A  until 20 inches Hg is reached.
Is the MAP sensor pressure less than the specified value?		 34 kPa Go to Step 10  Go to Step 12 
10
  1. Observe the MAP sensor pressure with the scan tool.
  2. Disconnect the J 23738-A  from the MAP sensor.
Does the MAP sensor pressure return to the original reading observed in Step 5 or Step 6?		 - Go to Step 11  Go to Step 12 
11 Inspect for the following engine conditions:
Did you find and correct the condition?		 - Go to Step 22  Go to Testing for Intermittent Conditions and Poor Connections
12 Test for an intermittent and for a poor connection at the MAP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 22  Go to Step 13 
13
  1. Disconnect the MAP sensor harness connector.
  2. Measure the voltage from the 5-volt reference circuit of the MAP sensor to a good ground with a DMM. Note the measurement as "Supply Voltage".
  3. Connect a test lamp and a DMM in series between the 5-volt reference circuit and the low reference circuit of the MAP sensor at the harness connector.
  4. Measure the amperage with the DMM. Note the measurement as "Amperage".
Is the amperage at the specified value?		 0 mA Go to Step 17  Go to Step 14 
14 
  1. Remove the DMM from the circuit.
  2. Connect the test lamp between the 5-volt reference circuit and the low reference circuit of the MAP sensor, at the harness connector.
  3. Measure the voltage from the 5-volt reference circuit at the test lamp to a good ground, with the DMM. Note the measurement as "Load voltage drop".
  4. Subtract the "Load voltage drop" from the "Supply voltage". Note the result as "Supply voltage drop".
  5. Divide the "Supply voltage drop" by the "Amperage".
Is the result more than the specified value?		 5 Ω Go to Step 16  Go to Step 15 
15 
  1. Measure the voltage from the low reference circuit of the MAP sensor at the test lamp to a good ground, with the DMM. Note the result as "Low reference voltage drop".
  2. Divide the "Low reference voltage drop" by the "Amperage".
Is the result more than the specified value?		 5 Ω Go to Step 18  Go to Step 20 
16 Test the 5-volt reference circuit between the powertrain control module (PCM) and the MAP sensor for high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 22  Go to Step 19 
17 Test the low reference circuit between the PCM and the MAP sensor for an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 22  Go to Step 19 
18 Test the low reference circuit between the PCM and the MAP sensor for high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 22  Go to Step 19 
19 Test for an intermittent and for a poor connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 22  Go to Step 21 
20 Replace the MAP sensor. Refer to Manifold Absolute Pressure (MAP) Sensor Replacement .
Did you complete the replacement?		 - Go to Step 22  -
21 Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 22  -
22
  1. Clear the DTCs with the scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. 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.
Did the DTC fail this ignition?		 - Go to Step 2  Go to Step 23 
23 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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