Test Description

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

4: This step tests the ability of the MAP sensor to correctly indicate BARO.
12: The measurement noted in this step will be used in subsequent steps if the measurement does not exceed the specified value.
14: This step calculates the resistance in the 5-volt reference circuit.
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 Engine Control Module (ECM) Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	-	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Inspect for the following conditions: Disconnected, damaged, or incorrectly routed vacuum hoses Missing or damaged manifold absolute pressure (MAP) sensor seal Restrictions in the MAP sensor vacuum source Intake manifold vacuum leaks Did you find and correct the condition?	-	Go to Step 25	Go to Step 3
3	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 4	Go to Step 5
4	In both vehicles, turn ON the ignition, with the engine OFF. Observe the MAP sensor pressure with a scan tool. Observe the MAP sensor pressure in the known good vehicle with a scan tool. Compare the values. Is the difference between the values less than the specified value?	3 kPa	Go to Step 6	Go to Step 11
5	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. Turn ON the ignition, with the engine OFF. Observe the MAP sensor pressure with a scan tool. Refer to Altitude vs Barometric Pressure . 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 6	Go to Step 11
6	Observe the MAP sensor pressure with a scan tool. Start the engine. Does the MAP sensor pressure change?	-	Go to Step 7	Go to Step 11
7	Turn OFF the ignition. Remove the MAP sensor from the engine vacuum source. Leave the MAP sensor connected to the engine harness. Connect a J 23738-A Mityvac to the MAP sensor. Turn ON the ignition, with the engine OFF. Observe the MAP sensor pressure with the scan tool. 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 MAP sensor pressure by 3-4 kPa. Is the decrease in MAP sensor pressure consistent?	-	Go to Step 8	Go to Step 11
8	Apply vacuum with the J 23738-A until 20 inch Hg is reached. Is the MAP sensor pressure less than the specified value?	34 kPa	Go to Step 9	Go to Step 11
9	Disconnect the J 23738-A from the MAP sensor. Does the MAP sensor pressure return to the value observed in step 4 or 5?	-	Go to Step 10	Go to Step 23
10	Inspect for the following conditions: Incorrect cam timing-Refer to Timing Chain, Sprockets, and/or Tensioner Replacement for the correct timing. Restricted exhaust flow-Refer to Restricted Exhaust . Worn piston rings-Refer to Engine Compression Test . Did you find and correct the condition?	-	Go to Step 25	Go to Testing for Intermittent Conditions and Poor Connections and Intermittent Conditions
11	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 25	Go to Step 12
12	Disconnect the MAP sensor electrical connector. Observe the MAP sensor parameter with the scan tool. Is the pressure less than the specified value?	12 kPa	Go to Step 13	Go to Step 17
13	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". Is the voltage more than the specified value?	5.2 V	Go to Step 18	Go to Step 14
14	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. Measure the amperage with the DMM. Note the measurement as "Amperage". Is the amperage equal to the specified value?	0 mA	Go to Step 20	Go to Step 15
15	Remove the DMM from the circuit. Connect the test lamp between the 5-volt reference circuit and the low reference circuit of the MAP sensor at the harness connector. 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". IMPORTANT: Before any calculations are performed, ensure that all measurements are converted into like units, for example volts/amps or millivolts/milliamps. Subtract the "Load voltage drop" from the "Supply voltage". Note the result as "Supply voltage drop". Divide the "Supply voltage drop" by the "Amperage". Is the result more than the specified value?	5 Ω	Go to Step 19	Go to Step 16
16	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". IMPORTANT: Before any calculations are performed, ensure that all measurements are converted into like units, for example volts/amps or millivolts/milliamps. Divide the "Low reference voltage drop" by the "Amperage". Is the result more than the specified value?	5 Ω	Go to Step 21	Go to Step 23
17	Test the MAP sensor signal circuit between the engine control module (ECM) and the MAP sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 25	Go to Step 22
18	Test all branches of the 5-volt reference circuit that is shared with the MAP sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 25	Go to Step 22
19	Test the 5-volt reference circuit between the ECM and the MAP sensor for high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 25	Go to Step 22
20	Test the low reference circuit between the ECM and the MAP sensor for an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 25	Go to Step 22
21	Test the low reference circuit between the ECM and the MAP sensor for high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 25	Go to Step 22
22	Test for shorted terminals and for poor connections at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	-	Go to Step 25	Go to Step 24
23	Replace the MAP sensor. Refer to Manifold Absolute Pressure (MAP) Sensor Replacement . Did you complete the replacement?	-	Go to Step 25	-
24	Replace the ECM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement?	-	Go to Step 25	-
25	Clear the DTCs with the scan tool. Turn OFF the ignition for 90 seconds. Start the engine. 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 26
26	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