Diagnostic Aids

If a component 5-volt reference circuit is shorted to ground or shorted to voltage, the other 5-volt reference circuits may be affected.
Inspect the MAP sensor vacuum source for leaks, restrictions or faulty connections.
This DTC may set as the result of a misfire.
This DTC may set as the result of improper tension or alignment of the timing chain. Refer to Timing Chain and Tensioner Removal , Timing Chain and Sprockets Cleaning and Inspection , and Timing Chain, Sprockets, Tensioner Installation in Engine Mechanical.
If this DTC is determined to be intermittent, refer to Intermittent Conditions .

DTC P0108

Step	Action	Values	Yes	No
Schematic Reference: Engine Controls Schematics Connect End View Reference: Powertrain Control Module (PCM) 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 in Vehicle DTC Information
2	Start the engine. Let the engine idle. Does the scan tool indicate that the manifold absolute pressure (MAP) sensor voltage is more than the specified value?	3.8 V	Go to Step 4	Go to Step 3
3	Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 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. Does the DTC fail this ignition?	-	Go to Step 4	Go to Diagnostic Aids
4	Inspect for the following conditions: Any disconnected, damaged, or incorrectly routed vacuum hoses A missing or damaged MAP sensor seal Any restrictions in the MAP sensor vacuum source Any intake manifold vacuum leaks Did you find and correct the condition?	-	Go to Step 15	Go to Step 5
5	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 in Wiring Systems. Did you find and correct the condition?	-	Go to Step 15	Go to Step 6
6	Disconnect the MAP sensor electrical connector. Turn the ignition ON, with engine OFF. Does the scan tool indicate that the MAP sensor voltage is less than the specified value?	0.2 V	Go to Step 7	Go to Step 9
7	Measure the voltage from the 5-volt reference circuit of the MAP sensor to a good ground. Does the voltage measure more than the specified value?	5.2 V	Go to Step 11	Go to Step 8
8	Connect a jumper wire between each of the terminals in the MAP sensor harness connector and the corresponding terminal at the MAP sensor. Refer to Using Connector Test Adapters in Wiring Systems. Measure the voltage from the low reference circuit of the MAP sensor at the jumper wire terminal to a good ground with a DMM. Refer to Measuring Voltage Drop in Wiring Systems. Is the voltage more than the specified value?	0.2 V	Go to Step 10	Go to Step 13
9	Test the signal circuit of the MAP sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 15	Go to Step 12
10	Test the low reference circuit of the MAP sensor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 15	Go to Step 12
11	Test the 5-volt reference circuit of the MAP sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 15	Go to Step 14
12	Test for an intermittent and for a poor connection at the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 15	Go to Step 14
13	Replace the MAP sensor. Refer to Manifold Absolute Pressure (MAP) Sensor Replacement . Did you complete the replacement?	-	Go to Step 15	-
14	Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement?	-	Go to Step 16	-
15	Perform the Fuel Trim Reset procedure with a scan tool. Did you complete the procedure?	-	Go to Step 16	-
16	Clear the DTCs with a scan tool. Turn OFF the ignition for 30 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 17
17	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 in Vehicle DTC Information	System OK