DTC P1107 Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage. Cadillac Eldorado 2000

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 2000 🢒 Eldorado 🢒 Engine 🢒 Engine Controls - 4.6L 🢒 DTC P1107 Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage

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Circuit Description

The manifold absolute pressure (MAP) sensor responds to changes in intake manifold pressure. The PCM supplies a 5 volt reference and a ground for the MAP sensor. The MAP sensor provides a signal to the PCM relative to the pressure changes in the manifold. The MAP sensor signal voltage to the PCM varies from below 2 volts at idle (low manifold absolute pressure - high vacuum) to above 4 volts with the key ON, engine not running or at wide-open throttle (high manifold absolute pressure - low vacuum). The PCM monitors the MAP signals for voltages outside the normal range of the MAP sensor. If the PCM detects a MAP sensor voltage that is intermittently low, DTC P1107 will set.

Conditions for Running the DTC

•	No TP sensor DTCs are set.

•	Throttle position is greater than 10 percent when engine speed is greater than 1000 RPM.

•	Throttle position is greater than 0 percent when engine speed is less than 1000 RPM.

Conditions for Setting the DTC

•	The MAP sensor signal voltage is less than 0.08 volt.

•	The condition exists for less than 1 second.

Action Taken When the DTC Sets

•	The PCM will illuminate the malfunction indicator lamp (MIL) the first time the malfunction is detected.

•	The PCM will store conditions which were present when the DTC set as Freeze Frame and Fail Records data.

Conditions for Clearing the MIL/DTC

•	The PCM will turn the MIL OFF during the third consecutive trip in which the diagnostic has been run and passed.

•	The History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.

•	The DTC can be cleared by using the scan tool Clear DTC Information function.

Diagnostic Aids

If the condition is intermittent, refer to Intermittent Conditions in Symptoms.

Step

Action

Value(s)

Yes

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

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

Are any other DTCs also set?

Go to the other DTCs first

Go to Step 3

Test the 5V reference A circuit for the following intermittent conditions:

•	An open circuit

•	A short to chassis or MAP sensor ground

•	Poor connections at the PCM or the MAP sensor, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

If a condition is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 5

Go to Step 4

Test the MAP sensor signal circuit for the following intermittent conditions:

•	An open circuit

•	A short to chassis or MAP sensor ground

•	Poor connections at the PCM or the MAP sensor, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

If a condition is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 5

Go to Diagnostic Aids

Turn ON the ignition.
Review and record the scan tool Fail Records data.
Clear the DTCs.
Operate the vehicle within the parameters listed in the Conditions for Running the DTC.
With the scan tool, monitor the Specified DTC Information for DTC P1107.

Does the scan tool indicate that DTC P1107 passed?

System OK

Go to Step 2