Was the Powertrain On Board Diagnostic (OBD) System Check performed?

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Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

1. Check for the following conditions:

•	MAP sensor seal missing or damaged.

•	Vacuum hoses disconnected, damaged, incorrectly routed.

•	Intake manifold vacuum leaks.

•	Vacuum leaks at throttle body.

•	Vacuum leaks at EGR valve flange and pipes.

•	Positive crankcase ventilation valve faulty, missing, or incorrectly installed.

2. If a problem is found, repair as necessary.

Was a problem found?

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Go to Step 14

Go to Diagnostic Aids

1. Disconnect the MAP sensor electrical connector.
2. Observe the MAP value displayed on the scan tool.

Is the MAP value displayed near the specified value?

0.0 V

Go to Step 4

Go to Step 12

1. Connect a test light between battery positive voltage and the MAP sensor signal circuit at the MAP sensor harness connector.
2. Observe the MAP value displayed on the scan tool.

Is the MAP value displayed near the specified value?

4.95 V

Go to Step 5

Go to Step 8

1. Jumper the 5 Volt Reference A circuit and the MAP signal circuit together at the MAP sensor harness connector.
2. Observe the MAP value displayed on the scan tool.

Is the MAP value displayed near the specified value?

4.95 V

Go to Step 6

Go to Step 7

1. Turn the ignition off.
2. Disconnect the PCM and check the sensor ground circuit for high resistance, an open between the PCM and the MAP sensor or for a poor connection at the PCM.
3. If a problem is found, repair as necessary. Refer to Repair Procedures in Electrical Diagnosis.

Was a problem found?

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Go to Step 14

Go to Step 10

1. Check the 5 Volt Reference A circuit for high resistance, an open between the PCM and the MAP sensor or a poor connection at the PCM.
2. If a problem is found, repair as necessary. Refer to Repair Procedures in Electrical Diagnosis.

Was a problem found?

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Go to Step 14

Go to Step 9

1. Turn the ignition off.
2. Disconnect the PCM, and check the MAP sensor signal circuit for high resistance, an open, a short to ground, or a short to the sensor ground circuit.
3. If a problem is found, repair as necessary. Refer to Repair Procedures in Electrical Diagnosis.

Was a problem found?

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Go to Step 14

Go to Step 9

1. Check the MAP sensor signal circuit for a poor connection at the PCM.
2. If a problem is found, repair as necessary. Refer to Repair Procedures in Electrical Diagnosis.

Did the terminal(s) require replacement?

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Go to Step 14

Go to Step 13

1. Check for a poor connection at the MAP sensor.
2. If a problem is found, repair as necessary. Refer to Repair Procedures in Electrical Diagnosis.

Was a problem found?

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Go to Step 14

Go to Step 11

Replace the MAP sensor. Refer to Manifold Absolute Pressure Sensor Replacement .

Is the action complete?

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Go to Step 14

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1. Turn the ignition off, disconnect the PCM.
2. Ignition on, check the MAP signal circuit for a short to voltage or a short to the 5 volt reference A circuit.
3. If a problem is found, repair as necessary. Refer to Repair Procedures in Electrical Diagnosis.

Was a problem found?

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Go to Step 14

Go to Step 13

Replace the PCM.

Important: :  The replacement PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming .

Is the action complete?

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Go to Step 14

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With engine idling, monitor MAP Sensor with scan tool while increasing engine RPM.

Does MAP sensor value change?

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System OK

Go to Step 2