DTC P0105 Manifold Absolute Pressure (MAP) Sensor Performance/Range. Pontiac Sunfire 2000

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 2000 🢒 Sunfire 🢒 DTC 🢒 DTC P0105 Manifold Absolute Pressure (MAP) Sensor Performance/Range

Engine Controls Component Views
Engine Data Sensors
OBD II Symbol Description Notice
Powertrain Control Module Connector End Views
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice

Circuit Description

The Powertrain Control Module (PCM) supplies a 5.0-volt reference signal and a ground to both the throttle position (TP) sensor and the manifold absolute pressure (MAP) sensor. The TP sensor sends a voltage signal back to the PCM relative to the throttle plate opening, and the MAP sensor sends a voltage signal back to the PCM relative to the intake manifold pressure. The PCM can detect if the TP sensor or the MAP sensor are out of range by comparing the two values against the high and low limits and engine speed defined within the engine calibration. If the TP or the MAP are not within the expected limits of the engine calibration, a DTC P0105 is set. During the DTC P0105 test, the actual MAP value is compared to a high limit threshold and low limit threshold for any speed and load in which the vehicle is operated. If the actual MAP value is more than the high limit, or less than the low limit, a malfunction is indicated.

Conditions for Running the DTC

DTCs P0107, P0108, P0117, P0118, P0122, P0123, P0131, P0132, P0171, P0172, P0201, P0202, P0203, P0204, P0300, P0325, P0341, P0342, P0440, P0442, P0502, P0506, P0507, P1441 are not set.

•	The engine run time is more than 40 seconds.

•	The engine speed is between 900 RPM and 6375 RPM for a manual transmission.

•	The engine speed is between 600 RPM and 6375 RPM for an automatic transmission.

•	The torque converter clutch (TCC) is stable to within 1 percent.

•	The engine speed is stable to within 50 RPM.

•	The idle air control (IAC) valve is stable to within 5 counts.

•	The above conditions are present for 1.5 seconds.

•	The TP sensor is stable to within 2 percent.

Conditions for Setting the DTC

The MAP sensor or the TP sensor is out of an expected range defined on the engine calibration for 14 to 16 seconds.

Action Taken When the DTC Sets

•	The malfunction indicator lamp (MIL) will illuminate after two consecutive ignition cycles in which the diagnostic runs with the malfunction present.

•	The PCM will record the operating conditions at the time that the diagnostic fails. This information will store in the Freeze Frame and Failure Records buffers.

•	A history DTC stores.

Conditions for Clearing the MIL/DTC

•	The MIL will turn OFF after three consecutive ignition cycles in which the diagnostic runs without a fault.

•	A history DTC will clear after 40 consecutive warm-up cycles without a fault.

•	Use a scan tool to clear the DTCs.

Diagnostic Aids

•

With the ignition turn ON and the engine stopped, the manifold pressure is equal to the atmospheric pressure, and the signal voltage will be high. This information is used by the PCM as an indication of the vehicle barometric pressure. Comparison of this reading with a known good vehicle with the same sensor is a good way to check the accuracy of a suspect sensor. The readings should be the same, within +/-0.4 volt.

•	The MAP sensor vacuum source should be thoroughly checked for restrictions at the intake manifold.

•	If a DTC P0105 cannot be duplicated, the information included in the Freeze Frame/Failure Records data can be useful. Use the scan tool DTC information data in order to determine the status of the DTC.

•	A DTC P0105 may set due to any condition that may cause an unreasonably high or low map value including the following engine conditions:

-	Incorrect cam timing

-	Restricted exhaust

-	Worn piston rings

-	Low fuel pressure

•	A TP sensor that is stuck may attempt to auto zero every time the engine runs. An indication if this happens is the TP percentage will be 0 percent and TP voltage will be high.

•	Using a DMM in order to check the 5.0-volt reference circuits may not detect small amounts of resistance within the malfunctioning circuit. Connecting a jumper wire from the 5.0-volt reference circuit to the signal circuit detects the small amounts of resistance.

•	Certain conditions can produce normal results when the circuits are probed, but can cause a bad reading when connected. Inspect for the following conditions on the TP and MAP sensor electrical connectors:

-	Spread terminals

-	Faulty electrical terminal connections

•	The MAP sensor needs a dedicated vacuum source. Check the MAP sensor and the MAP sensor vacuum source for a vacuum leak.

Test Description

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

The Powertrain On-Board Diagnostic (OBD) System Check prompts the technician to complete some basic checks and stores the Freeze Frame and Failure Records data on the scan tool if applicable. This creates an electronic copy of the data that was taken when the malfunction occurred. The information is then stored in the scan tool for later reference.

The TP sensor may be able to auto zero itself after several engine starts if it is stuck, but may not be able to reach its range near 100 percent. The TP angle should increase steadily. If the voltage value spikes high or low, consider the test failed.

The TP sensor has an auto zeroing feature. If the voltage reading is between 0.2 and 0.9 volts, the PCM will assume the TP sensor is at a closed throttle position of 0 percent. If the reading is out of the auto zeroing range at closed throttle, look for a binding or damaged linkage.

If a MAP sensor displays a BARO value that does not appear normal for the altitude where the vehicle is located, the MAP sensor is considered to be malfunctioning.

While starting the engine, the MAP sensor should detect any changes in manifold pressure. This test is to determine if the sensor is stuck at a value.

A normal MAP sensor will react as quickly to the throttle changes as they can be made. A MAP sensor should not appear to be "lazy" or catch up with the throttle movements.

The MAP sensor vacuum source should be thoroughly checked for restrictions. This step checks if the reason for no MAP change was due to a malfunctioning sensor or a vacuum source problem to the sensor.

A short to voltage in the signal circuit would most likely be caused by the 5.0-volt reference circuit being pinched with the signal circuit.

Spread terminals or faulty electrical connections can produce normal results when the circuits are probed but cause incorrect readings when the circuits are connected. Be sure to check all terminals for this condition.

A short to voltage in the signal circuit would most likely be caused by the 5.0-volt reference circuit. Inspect the 5.0-volt reference circuit for being pinched with the signal circuit.

Replacement PCMs must be reprogrammed and the crankshaft position system variation procedure must be preformed. Refer to the latest Techline™ information for programming procedures.

If no malfunctions have been found at this point and no additional DTCs were set, refer to Diagnostic Aids for additional inspections and information.

DTC P0105 -- TP/MAP Sensor Performance

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 MAP, TP, A/C or fuel tank pressure sensor DTCs set?

Diagnose the other DTCs first

Go to Step 3

Perform a visual and physical inspection of the MAP sensor and the TP sensor areas.
Repair the sensors if a malfunction is found.

Was a malfunction found?