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| • | 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 |
|---|---|---|---|---|
5V Reference | P0107 00 | P0106 00, P0107 00 | P0108 00 | P0106 00, P0107 00 |
Signal Circuit | P0107 00 | P0106 00, P0107 00 | P0106 00, P0108 00 | P0106 00, P0107 00 |
Low Reference | - | P0106 00, P0107 00, P0108 00 | - | P0106 00, P0108 00 |
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Engine running, transmission in Park or Neutral Parameter Normal Range: 20-48 kPa (2.9-7 PSI) (varies with altitude) | |||
5V Reference | 10 kPa (1.5 PSI) | 10 kPa (1.5 PSI) | 50 kPa (7.2 PSI) |
Signal Circuit | 10 kPa (1.5 PSI) | 10 kPa (1.5 PSI) | 104 kPa (15.0 PSI) |
Low Reference | - | 98 kPa (14.21 PSI) | 104 kPa* (15.0 PSI) |
* 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 V to the MAP sensor on the 5 V 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 sensor is greater than 28%.
| • | DTCsP0107 00, P0108 00, P0112 00, P0113 00, P0117 00, P0118 00, P0335 00, P0336 00 are not set |
| • | The engine is running greater than or equal to 400 RPM. |
| • | The intake air temperature (IAT) Sensor parameter is between -7 to +125°C (19-257°F). |
| • | The engine coolant temperature (ECT) Sensor parameter is between 70-125°C (158-257°F). |
| • | This DTC runs continuously when the above conditions are met. |
| • | DTCs P0122 00, P0123 00, P0222 00, P0223 00 or P0641 00 are not set. |
| • | The throttle position sensor is greater than or equal to 0% while the engine speed is less than 1 000 RPM. |
| OR |
| • | The throttle position sensor is greater than 5% while the engine speed is greater than 1 000 RPM. |
| • | The ignition voltage is greater than 11 V. |
| • | The DTC runs continuously when the above conditions are met. |
| • | The engine has been running for a length of time that is determined by the start-up coolant temperature. The length of time ranges from 5.5 min at colder than -30°C (-22°F) to 10 s at greater than 30°C (+86°F). |
| • | DTCs P0122 00, P0123 00, P0222 00, P0223 00 or P0651 00 are not set |
| • | The engine has been running for greater than 10 s. |
| • | The throttle position sensor is less than 15% while the engine speed is less than 2 500 RPM. |
| OR |
| • | The throttle position is less than or equal to 35% when 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 Sensor pressure is not within range of the calculated pressure that is derived from the system of models for more than 0.5 s.
The ECM detects that the MAP sensor voltage is less than 0.05 V for greater than 5 s.
The ECM detects that the MAP sensor voltage is more than 4.9 V for greater than 5 s.
DTCs P0106 00, P0107 00 and P0108 00 are Type B DTCs.
DTCs P0106 00, P0107 00 and P0108 00 are Type B DTCs.
Note: Verify that the engine is in good mechanical condition before continuing with this diagnostic.
| • | If a shared 5 V reference circuit is shorted to ground or shorted to a voltage, other 5 V reference circuits may be affected. |
| • | A skewed MAP sensor will cause the BARO value to be inaccurate. Use the scan tool and compare the BARO parameter at ignition ON to the Altitude vs. Barometric Pressure Table. |
| • | A skewed MAP Sensor will also cause the first and second intake manifold models to disagree with the actual MAP sensor measurements. Use the scan tool and compare the MAP Sensor parameter to a known good vehicle, under various operating conditions. |
| • | Inspect for the following conditions: |
| - | Incorrect camshaft timing--refer to Timing Belt Inspection for the correct timing. |
| - | Worn piston rings--refer to Engine Compression Test . |
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
| • | EN 23738-A Mityvac |
| • | EN 35555 Metal Mityvac |
For equivalent regional tools, refer to Special Tools .
| ⇒ | If any of the DTCs are set, refer to DTC P0641, P0651, or P0697 . |
| ⇒ | If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module. |
| ⇒ | If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module. |
Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module. |
| ⇒ | If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module. |
| ⇒ | If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module. |
| ⇒ | If greater than the specified range, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module. |
| ⇒ | 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 K20 Engine Control Module. |
The ignition ON engine OFF, MAP Sensor scan tool value should decrease within approximately 4 kPa (0.6 PSI) by the amount of vacuum applied with the EN 23738-A Mityvac or EN 35555 Metal Mityvac . For example, at 92 kPa (13.3 PSI), the MAP Sensor scan tool reading should be between 71-79 kPa (10.29-11.45 PSI) with 17 kPa (2.47 PSI) of vacuum applied to the sensor.
Ignition ON, engine OFF, MAP sensor parameter | MAP sensor parameter with 5 inches of vacuum applied | MAP sensor parameter with 10 inches of vacuum applied |
|---|---|---|
100 | 79 to 87 | 62 to 70 |
90 | 69 to 77 | 52 to 60 |
80 | 59 to 67 | 42 to 50 |
70 | 49 to 57 | 32 to 40 |
60 | 39 to 47 | 22 to 30 |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
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