• | 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, P0405, P0452, P0651, P2106, P2110 | P0107 | P0108, P0651, P2076 | P0106 |
MAP Sensor Signal | P0107 | P0107 | P0108 | P0106 |
Low Reference | -- | P0108, P2106, P2110 | -- | P0106 |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: Engine operating in Closed Loop Parameter Normal Range: 32-48 kPa | |||
5-Volt Reference | 10 kPa | 10 kPa | 50 kPa |
MAP Sensor Signal | 10 kPa | 10 kPa | 104 kPa |
Low Reference | -- | 98 kPa | 104 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 throttle position (TP) sensor is greater than 28 percent.
• | DTCs P0122 and P0123 are not set. |
• | The TP sensor is greater than or equal to 0 percent while the engine speed is less than 1,000 RPM. |
OR |
• | The TP sensor is greater than 5 percent while the engine speed is greater than 1,000 RPM. |
• | The ignition 1 voltage is greater than 11 volts. |
• | The DTC runs continuously when the above conditions are met. |
• | DTCs P0122 and P0123 are not set. |
• | The engine has been running for greater than 10 seconds. |
• | The TP sensor is less than 15 percent while the engine speed is less than 2,500 RPM. |
OR |
• | The TP sensor is less than 35 percent while the engine speed is greater than 2,500 RPM. |
• | The DTC runs continuously when the above conditions are met. |
The ECM detects that the MAP is less than 12 kPa for greater than 5 seconds.
The ECM detects that the MAP is greater than 103 kPa for greater than 5 seconds.
• | DTC P0107 and P0108 are Type A DTCs. |
• | The BARO will not be updated. |
DTC P0107 and P0108 are Type A DTCs.
• | If a shared 5-volt reference circuit is shorted to ground or shorted to a voltage, other 5-volt reference circuits may be affected. |
• | The scan tool 5 volt reference parameter should display between 4.8-5.2 volts. |
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
J 23738-A Vacuum Pump
⇒ | If P0651 is set, refer to DTC P0641 or P0651. |
Important: In extreme cold weather conditions ice may form in the vacuum source to the MAP sensor and may set a DTC. Inspect the MAP sensor and the vacuum source for ice, moisture, or other restrictions.
⇒ | If not within the specified range, repair the restriction in the vacuum hose to the MAP sensor. |
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | 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. |
• | 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 within the specified range, replace the MAP sensor. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, setup, and programming |