DTC Descriptors

DTC P0106: Manifold Absolute Pressure (MAP) Sensor Performance

DTC P0107: Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage

DTC P0108: Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage

Diagnostic Fault Information

Important: Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Circuit	Short to Ground	High Resistance	Open	Short to Voltage	Signal Performance
5-Volt Reference	P0641, P0452, P0107, P0522, P0532, P0807 (Manual Trans only)	P0106, P0107	P0107	P0641, P0452, P0107, P0522, P0532, P0807 (Manual Trans only)	P0106, P0107
MAP Sensor Signal	P0107	P0106, P0107	P0107	P0641, P0108, P0106, P0523	P0106, P0107, P1101
Low Reference	--	P0106, P0107	P0106, P1101	--	P0106, P0108

Typical Scan Tool Data

MAP Sensor

Circuit	Normal Range	Short to Ground	Open	Short to Voltage
5-Volt Reference	--	10 kPa	10 kPa	104 kPa
MAP Sensor Signal	12-103 kPa	10 kPa	10 kPa	104 kPa
Low Reference	--	36 kPa	93 kPa	--

Circuit/System Description

The manifold absolute pressure (MAP) sensor measures the pressure inside the intake manifold. Pressure in the intake manifold is affected by engine speed, throttle opening, air temperature, and barometric pressure (BARO). A diaphragm within the MAP sensor is displaced by the pressure changes that occur from the varying load and operating conditions of the engine. The sensor translates this action into electrical resistance. The MAP sensor wiring includes 3 circuits. The control module supplies a regulated 5 volts to the sensor on a 5-volt reference circuit. The control module supplies a ground on a low reference circuit. The MAP sensor provides a signal voltage to the control module, relative to the pressure changes on the MAP sensor signal circuit. The control module converts the signal voltage input to a pressure value.

Under normal operation, the highest pressure that can exist in the intake manifold is equal to the BARO. This occurs when the vehicle is operated at wide open throttle (WOT), or when the ignition is ON while the engine is OFF. Under these conditions, the control module uses the MAP sensor to determine the current BARO. The lowest manifold pressures occur when the vehicle is idling or decelerating. The MAP can range from 10 kPa when pressures are low to as much as 104 kPa when pressures are high, depending on the BARO.

The control module should detect a low signal voltage at a low MAP, such as during an idle or a deceleration. The control module should detect a high signal voltage at a high MAP, such as the ignition is ON, with the engine OFF, or at a WOT.

Within the control module, the intake flow rationality diagnostic has the ability to determine an inaccurate input from the 3 systems it monitors. Calibrated within the diagnostic are estimates for the MAP, the mass air flow (MAF), and the throttle position (TP) for all engine operating conditions.

The diagnostic uses the following system of models and calculations that are then compared to the actual measured values from the MAF, MAP, and the TP sensors and to each other to determine the appropriate DTC to fail.

Conditions for Running the DTC

P0106

P0107

P0108

Conditions for Setting the DTC

P0106

P0107

P0108

Action Taken When the DTC Sets

DTC P0106, P0107, and P0108 are Type B DTCs

Conditions for Clearing the DTC

DTC P0106, P0107, and P0108 are Type B DTCs

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Electrical Information Reference

Scan Tool Reference

Scan Tool Data List

Special Tool Reference

J 23738-A Mityvac

DTC Type Reference

Circuit/System Verification

1. If DTC P0641 or P0651 is also set, correct DTC P0641 or P0651 first.
2. Inspect for the following conditions:

•	Disconnected, damaged, or incorrectly routed vacuum hoses

•	Manifold absolute pressure (MAP) sensor disconnected from the vacuum source

•	Restrictions in the MAP sensor vacuum source

•	Intake manifold vacuum leaks

•	Check for a properly functioning oxygen sensor. Refer to Scan Tool Data List .

Circuit/System Testing

P0106

1. Ignition OFF, disconnect the MAP sensor from the vacuum source, leave connected to engine harness.
2. Connect a J 23738-A to the MAP sensor.
3. Turn ON the ignition, with the engine OFF.
4. Observe the MAP sensor pressure with the scan tool.
5. Apply vacuum with the J 23738-A to the MAP sensor in 1 inch Hg increments until 15 inches Hg is reached. Each 1 inch Hg should decrease MAP sensor pressure by 3-4 kPa. Monitor the MAP sensor pressure to see if the decrease in pressure is consistent.

⇒	If decrease in pressure is not consistent, then test for intermittent and poor connections at the MAP sensor. If connections test OK, replace the MAP sensor.

6. Apply vacuum with the J 23738-A until 20 inches Hg is reached. Observe the MAP sensor pressure for less than 34 kPa.
7. If more than 34 kPa, test for an intermittent and for a poor connection at the MAP sensor. If connections test OK, replace the MAP sensor.

P0107 or P0108

1. Ignition OFF, disconnect the harness connector at the MAP sensor.
2. Ignition OFF, test for less than 5 ohm of resistance between the low reference circuit terminal A and ground.

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the control module.

3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal C and ground.

⇒	If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the control module.

⇒	If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the control module.

4. Verify the scan tool MAP parameter is less than 12 kPa.

⇒	If greater than the specified range, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the control module.

5. Install a 3A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal C. Verify the scan tool MAP parameter is greater than 103 kPa.

⇒	If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the control module.

6. If all circuits test normal, test or replace the MAP sensor.

Repair Instructions

Important: Perform the Diagnostic Repair Verification after completing the diagnostic procedure.