• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
5-Volt Reference | P0107 | P0107 | P0108 | P0106 |
MAP Sensor Signal | P0107 | P0107 | P0108 | P0106 |
Low Reference | -- | P0107 | -- | P0106 |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: Engine operating in Closed Loop. Parameter Normal Range: 32-42 kPa | |||
5-Volt Reference | 10 kPa | 10 kPa | 104 kPa |
MAP Sensor Signal | 10 kPa | 10 kPa | 104 kPa* |
Low Reference | -- | 10 kPa | -- |
* Internal ECM damage may occur if the circuit is shorted to B+. |
The manifold absolute pressure (MAP) sensor responds to pressure changes in the intake manifold. The pressure changes occur based on the engine load. The engine control module (ECM) supplies 5 volts to the MAP sensor on the 5-volt reference circuit. The ECM provides a ground on the low reference circuit. The MAP sensor provides a signal to the ECM on the MAP sensor signal circuit which is relative to the pressure changes in the manifold. The ECM detects a low signal voltage at a low MAP, such as during an idle or a deceleration. The ECM detects a high signal voltage at a high MAP, such as the ignition is ON, with the engine OFF, or at a wide open throttle (WOT). The MAP sensor is also used to determine the barometric pressure (BARO). This occurs when the ignition switch is turned ON, with the engine OFF. The BARO reading may also be updated whenever the TP sensor is greater than 28 percent.
• | DTCs P0107, P0108, P0117, P0118, P0122, P0123, P0201, P0202, P0203, P0204, P0300, P0351, P0352, P0401, P0402, P0404, P0405, P0406, P042E, P0506, and P0507 are not set. |
• | The engine is running. |
• | Valid barometric pressure (BARO) update. |
• | The traction control is not active. |
• | The torque converter clutch (TCC) is steady (A/T). |
• | The A/C compressor clutch is steady. |
• | The coolant temperature is greater than -10°C (+14°F). |
• | The engine speed is between 1,300-4,500 RPM. |
• | The change in engine speed is less than 200 RPM. |
• | The change in idle air is less than 5 percent. |
• | The change in throttle position (TP) is less than 3 percent, or the change in MAP is less than 5 percent. |
• | The change in exhaust gas recirculation (EGR) position is less than 6 percent. |
• | The above conditions are stabilized for 1.5 seconds. |
• | DTC P0106 runs continuously when the above conditions are met. |
The ECM detects that the actual MAP signal is not within the predicted range for greater than 25 seconds.
DTC P0106 is a Type B DTC.
DTC P0106 is a Type B DTC.
With the ignition ON and the engine stopped, the manifold pressure is equal to atmospheric pressure and the signal voltage will be high. This information is used by the ECM as an indication of vehicle altitude. 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. Readings should be the same +0.4 volt.
The MAP sensor vacuum source should be thoroughly inspected for restrictions at the intake manifold.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
J 23738-A Mityvac
Important: The vehicle used for the comparison is not limited to the same type of vehicle being serviced. A vehicle known to provide an accurate reading is acceptable.
Important: The Altitude vs Barometric Pressure table indicates a pressure range for a given altitude under normal weather conditions. Weather conditions consisting of very low or very high pressure and/or very low or very high temperature may cause a reading to be slightly out of range.
• | Vacuum leaks or restrictions at the MAP sensor. |
• | Engine vacuum leaks |
• | Restricted exhaust--Refer to Restricted Exhaust. |
• | Worn piston rings--Refer to Engine Compression Test. |
• | Incorrect cam timing--Refer to Timing Belt Inspection. |
⇒ | If greater than specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
Important: The 5-volt reference circuits are internally and externally connected at the ECM. Other component DTCs may be set. If other DTCs are set, review the electrical schematic and diagnose the applicable circuits and components.
⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If greater than specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
Important: The 5-volt reference circuits are internally and externally connected at the ECM. Other component DTCs may be set. If other DTCs are set, review the electrical schematic and diagnose the applicable circuits and components.
⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or open/high resistance. If the circuits tests normal, replace the ECM. |
⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If not within the specified range, replace the throttle body assembly. |
⇒ | If not within the specified range or is erratic, replace the throttle body assembly. |
⇒ | If not within the specified range or is erratic, replace the throttle body assembly. |
• | Disconnect the vacuum supply hose from the MAP sensor |
• | Remove the MAP sensor from the intake manifold |
⇒ | If not within the specified range, replace the MAP sensor. |
⇒ | If not with in the specified range, replace the MAP sensor. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for engine control module replacement, setup, and programming |