GM Service Manual Online
For 1990-2009 cars only

Object Number: 597500  Size: SF
Engine Controls Components
MAP, TPS, MAF, IAC, ECT
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice

Circuit Description

The manifold absolute pressure (MAP) sensor is mounted to the top rear of the intake manifold. The MAP sensor measures the pressure changes within the intake manifold which is an indication of the engine load. The MAP sensor has a 5.0 volt reference, a ground, and a signal circuit.

The MAP sensor contains a diaphragm which changes the resistance based on pressure. When the manifold pressure is low the sensor output voltage is low. When the manifold pressure is high the sensor output voltage is high.

The MAP sensor voltage depending on altitude, can range from 1.0-1.5 volts at idle to 4.0-4.9 volts at wide open throttle (WOT).

When the powertrain control module (PCM) senses a signal voltage higher than the normal operating range of the sensor, this diagnostic trouble code (DTC) sets.

Conditions for Running the DTC

    • No throttle position (TP) sensor DTCs are set.
    • The engine is operating.
    • The TP sensor angle is less than 5 percent when the engine speed is 1,000 RPM or less.
        OR
    • The TP sensor angle is less than 18 percent when engine speed is more than 1,000 RPM.

Conditions for Setting the DTC

    • The MAP sensor voltage is more than 4.3 volts.
    • All conditions are met for more than 4 seconds.

Action Taken When the DTC Sets

    • The PCM illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
    • The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the PCM stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the PCM records the operating conditions at the time of the failure. The PCM writes the conditions to the Freeze Frame and updates the Failure Records.

Conditions for Clearing the MIL/DTC

    • The PCM turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
    • A last test failed, or current DTC, clears when the diagnostic runs and does not fail.
    • A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
    • Use a scan tool in order to clear the MIL and the DTC.

Diagnostic Aids

Important: Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM connector gaskets when diagnosing or replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent water intrusion into the PCM.

    • The following may cause an intermittent:
       - Mis-routed harness
       - Rubbed through wire insulation
       - Broken wire inside the insulation
    • The PCM 5.0 volt reference circuits are internally connected within the PCM. If all the MAP sensor circuits are OK, inspect the exhaust gas recirculation (EGR) circuits for malfunctions.
    • For an intermittent, refer to Symptoms .

Test Description

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

  1. If DTCs P1635 and P1639 set at the same time, this indicates that the MAP sensor circuit is shorted to a voltage.

  1. This step determines if the malfunction is present.

  2. Using the Freeze Frame and Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and Failure Records data can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can also help determine how many ignition cycles the diagnostic reported a pass or a fail. Operate the vehicle within the same Freeze Frame conditions such as RPM, load, vehicle speed, temperature, etc. that you observed. This will isolate when the DTC failed.

  3. The MAP sensor is located under the intake manifold sight shield. This step checks whether the signal circuit is shorted to a voltage. Re-install the intake manifold sight shield after the repairs are completed.

  4. This step checks whether a ground circuit is available at the MAP sensor.

  5. Remove the MAP sensor and check if vacuum is available to the sensor. Also, inspect the MAP sensor seal for nicks and cuts.

Step

Action

Value(s)

Yes

No

1

Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?

--

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

2

  1. Install a scan tool.
  2. Idle the engine.
  3. Monitor the diagnostic trouble code (DTC) information using the scan tool.

Did DTCs P1635 and P1639 fail this ignition cycle?

--

Go to Step 7

Go to Step 3

3

Important: If the engine idle is rough, unstable, or incorrect, repair the idle condition before using this table. Refer to Symptoms .

Monitor the MAP sensor voltage on the Engine 1 Data List on the scan tool.

Is the MAP sensor voltage above the specified value?

4.3 V

Go to Step 5

Go to Step 4

4

  1. Turn ON the ignition, with the engine OFF.
  2. Review the Freeze Frame and Failure Records data for this DTC and observe the parameters.
  3. Turn OFF the ignition for 15 seconds.
  4. Start the engine.
  5. Operate the vehicle within the conditions required for this diagnostic to run, and as close to the conditions recorded in the Freeze Frame and Failure Records as possible. Special operating conditions that you need to meet before the PCM will run this diagnostic, where applicable, are listed in Conditions for Running the DTC.
  6. Select the Diagnostic Trouble Code (DTC) option, the Specific DTC option, then enter the DTC number using the scan tool.

Does the scan tool indicate that this diagnostic failed this ignition?

--

Go to Step 5

Go to Diagnostic Aids

5

  1. Remove the intake manifold sight shield.
  2. Disconnect the MAP sensor electrical connector.
  3. Observe the MAP sensor voltage displayed on the scan tool.

Is the MAP sensor voltage below the specified value?

1 V

Go to Step 6

Go to Step 7

6

Probe the sensor ground circuit with the J 35616-200 test lamp to B+. Refer to Probing Electrical Connectors in Wiring Systems.

Is the test lamp illuminated?

--

Go to Step 8

Go to Step 10

7

  1. Check the MAP sensor signal circuit for a short to voltage or a short to the 5 volt reference circuit.
  2. Repair the MAP sensor signal circuit if the circuit is shorted. Refer to Wiring Repairs in Wiring Systems.

Is the MAP sensor signal circuit shorted?

--

Go to Step 16

Go to Step 12

8

Measure the voltage at the 5 volt reference circuit to the battery ground using the DMM.

Is the voltage near the specified value?

5 V

Go to Step 9

Go to Step 15

9

Check for a plugged or leaking vacuum supply to the MAP sensor.

Is the vacuum supply OK?

--

Go to Step 13

Go to Step 14

10

  1. Disconnect the PCM connector C1 located on the same side of the manufacturers logo. Refer to Powertrain Control Module Replacement .
  2. Check continuity of the MAP sensor ground circuit. Refer to Testing for Continuity in Wiring Systems.
  3. Repair the open or the poor connection if the MAP sensor ground circuit measures over the specified value. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

5 ohms

Go to Step 16

Go to Step 11

11

  1. Check for a poor PCM sensor ground terminal connection at the PCM connector. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
  2. Replace the faulty terminal if a problem is found. Refer to Connector Repairs in Wiring Systems.

Did the terminal require replacement?

--

Go to Step 16

Go to Step 12

12

Important:: The replacement PCM must be programmed.

Replace the PCM. Refer to Powertrain Control Module Replacement .

Is the action complete?

--

Go to Step 16

--

13

Important: Inspect for poor connections at the MAP sensor before replacing. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

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

Is the action complete?

--

Go to Step 16

--

14

Repair the faulty vacuum supply.

Is the action complete?

--

Go to Step 16

--

15

Repair the 5 volt reference circuit for a short to voltage. Refer to Wiring Repairs in Wiring Systems.

Is the action complete?

--

Go to Step 16

--

16

  1. Select the Diagnostic Trouble Code (DTC) option and the Clear DTC Information option using the scan tool.
  2. Idle the engine at the normal operating temperature.
  3. Select the Diagnostic Trouble Code (DTC) option and the Specific DTC option, then enter the DTC number using the scan tool.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text, if applicable.

Does the scan tool indicate that this test ran and passed?

--

Go to Step 17

Go to Step 2

17

Select the Capture Info option and the Review Info option using the scan tool.

Does the scan tool display any DTCs that you have not diagnosed?

--

Go to the applicable DTC table

System OK