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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 | High Resistance | Open | Short to Voltage | Signal Performance |
---|---|---|---|---|---|
5 V Reference | P0107, P0697 | P0106, P0107 | P0106, P0107 | P0106, P0107, P0697 | P0106, P0107 |
MAP Sensor Signal | P0107 | P0106, P0107 | P0107 | P0106, P0108 | P0106, P0107, P1101 |
Low Reference | - | P0106, P0108 | P0106, P0108 | - | P0106, P0108 |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: Engine Running Parameter Normal Range: 2-16 psi - Varies with altitude | |||
5 V Reference | 0 psi | 0 psi | 18+psi |
MAP Sensor Signal | 0 psi | 0 psi | 18+psi |
Low Reference | - | 18+psi | - |
The manifold absolute pressure (MAP) sensor measures the pressure inside the intake manifold. Pressure in the inlet 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 engine control module (ECM) supplies a regulated 5 V to the sensor on a 5 V reference circuit. The ECM supplies a ground on a 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 highest pressure that can exist in the inlet manifold is equal to BARO. This occurs when the engine is operated at wide-open throttle (WOT) or when the vehicle is ON while the engine is OFF. Under these conditions, the ECM uses the MAP sensor to determine the current BARO. The lowest manifold pressures occur when the vehicle is idling or decelerating. MAP can range from 1.5 psi, when pressures are low, to as much as 15 psi when pressures are high, depending on the BARO. The ECM monitors the MAP sensor signal for pressure outside of the normal range.
These DTCs run continuously.
The ECM detects that the MAP sensor voltage is less than 0.2 V for greater than 4 s.
The ECM detects that the MAP sensor voltage is greater than 4.5 V for greater than 4 s.
DTCs P0107 and P0108 are Type B DTCs.
DTCs P0107 and P0108 are Type B DTCs.
Hybrid Modes of Operation Description
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
J-23738-A Vacuum Pump
For equivalent regional tools, refer to Special Tools : Diagnostic Tools .
⇒ | If a DTC is set, refer to DTC P0641, P0651, P0697, or P06A3 : ECM . |
⇒ | If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM. |
⇒ | 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 ECM. |
⇒ | 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 ECM. |
⇒ | If greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the K20 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 K20 ECM. |
Note: You must perform the Circuit/System Testing in order to verify the integrity of the MAP sensor circuits before proceeding with the Component Testing.
Vehicle in Service Mode, MAP Sensor Parameter | MAP Sensor Parameter With 5 Inches of Vacuum Applied | MAP Sensor Parameter With 10 Inches of Vacuum Applied |
---|---|---|
15 psi | 11.5-12.5 psi | 9.0-10.0 psi |
14 psi | 10.5-12.0 psi | 8.0-9.5 psi |
13 psi | 10.0-11.0 psi | 7.5-9.0 psi |
12 psi | 8.5-10.0 psi | 6.0-7.5 psi |
10 psi | 7.0-8.5 psi | 4.5-6.0 psi |
9 psi | 5.5-7.0 psi | 3.0-4.5 psi |
⇒ | If the voltage is erratic, replace the B74 MAP sensor. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, setup, and programming |
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