• | 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 | High Resistance | Open | Short to Voltage | Signal Performance |
---|---|---|---|---|---|
5-Volt Reference | P0107, P0698, P2564 | P0106 | P0107 | P0106, P0401, P0699, P2565 | P0106 |
MAP Sensor Signal | P0107 | P0106 | P0107 | P0108 | P0106 |
Low Reference | -- | P0106 | P0108 | -- | P0106 |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: Engine running at idle Normal Parameter Range: Varies 54-253 kPa | |||
5-Volt Reference | 43 kPa | 43 kPa | 200-205 kPa |
MAP Sensor Signal | 43 kPa | 43 kPa | 255 kPa |
Low Reference | -- | 255 kPa | -- |
The manifold absolute pressure (MAP) sensor measures the pressure inside the intake manifold. Pressure in the intake manifold is affected by turbocharger output, engine speed, accelerator pedal input, 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 engine control module (ECM) supplies a regulated 5 volts to the sensor on the 5-volt reference circuit. The ECM supplies a ground on the low reference circuit. The MAP sensor provides a signal voltage to the ECM, relative to the pressure changes, on the MAP sensor signal circuit. The ECM converts the signal voltage input to a pressure value. Under normal operation, the lowest pressure that can exist in the intake manifold is equal to the BARO. This occurs when the vehicle is operating at idle or when the ignition is ON, while the engine is OFF. The ECM uses the MAP sensor to aid in diagnosis of the turbocharger performance. The highest manifold pressures occur when the turbocharger output is high. Manifold pressure can range from 58 kPa (8 psi) when pressure are low, to more than 240 kPa (34 psi) when pressures are high, depending on the BARO. The MAP sensor has a range of 43-253 kPa (6-36 psi).
• | DTCs P0107, P0108, P2228, or P2229 are not set. |
• | The engine speed is less than 760 RPM. |
• | This DTC runs continuously within the enabling conditions. |
The ECM detects that the BARO and MAP sensors disagree by more than 14 kPa with the ignition ON, for more than 10 seconds.
• | DTC P0106 is a Type A DTC. |
• | The control module commands Reduced Engine Power mode. |
• | A message center or an indicator may display Reduced Engine Power. |
DTC P0106 is a Type A DTC.
• | A slight resistance of 20-30 ohms on the 5-volt reference or low reference circuits may cause this DTC to set. |
• | Verify that any electrical aftermarket devices are properly connected and grounded. Refer to Checking Aftermarket Accessories . |
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
• | J 23738-A Mityvac |
• | J 35555 Metal Mityvac |
⇒ | If any of the DTCs are set, refer to DTC P0698 or P0699 . |
Important: Perform the Circuit/System Verification before proceeding with the Circuit/System Testing.
• | Any damaged components |
• | Loose or improper installation |
• | An air flow restriction or leak |
• | Verify that restrictions do not exist in MAP sensor port. |
• | Any snow or ice build-up at the air cleaner, MAF, and MAP sensor |
⇒ | If the BARO parameter is outside the range specified, replace the ECM. |
⇒ | 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 an 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 greater than 45 kPa, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the ECM. |
⇒ | If less than 253 kPa, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM. |
Important: You must perform the Circuit/System Testing in order to verify the integrity of the MAP sensor circuits before proceeding with Component Testing.
⇒ | If the voltage is erratic, replace the MAP sensor. |
• | Control Module References for ECM replacement, setup, and programming |