2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1756

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1756

Circuit Description

The manifold absolute pressure (MAP) sensor measures the pressure inside the intake manifold. Pressure in the intake 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 volts to the sensor on a 5-volt 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 intake manifold is equal to BARO. This occurs when the vehicle is operated at

wide-open throttle (WOT) or when the ignition 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 10 kPa, when pressures

are low, to as much as 104 kPa when pressures are high, depending on the BARO. The ECM monitors the MAP sensor signal for pressure outside

of the normal range.

Conditions for Running the DTC

P0107

* DTCs P0641, P0651, P1516, P2101, P2125, P2135, P2138, P2176 are not set.

* The engine speed is greater than 400 RPM.

* The throttle angle is greater than 0 percent when the engine speed is less than 800 RPM.

OR

* The throttle angle is greater than 13 percent when the engine speed is greater than 800 RPM.

* This DTC runs continuously when the above conditions are met.

P0108

* DTCs P1516, P2101, P2125, P2135, P2138, P2176 are not set.

* The engine has been running for a period of time that is determined by the start-up engine coolant temperature (ECT). The time ranges from

8 seconds at less than -30掳C (-22掳F) to 3 seconds at greater than 30掳C (86掳F).

* The throttle angle is less than 1 percent when the engine speed is less than 1,200 RPM.

OR

* The throttle angle is less than 20 percent when the engine speed is greater than 1,200 RPM.

* This DTC runs continuously when the above conditions are met.

Conditions for Setting the DTC

P0107

The ECM detects that the MAP sensor voltage is less than 0.1 volt for more than 4 seconds.

P0108

The ECM detects that the MAP sensor voltage is more than 4.9 volts for greater than 4 seconds.

Action Taken When the DTC Sets

DTCs P0107 and P0108 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0107 and P0108 are Type B DTCs.

Diagnostic Aids

Verify the integrity of the MAP sensor system by inspecting for the following conditions:

* Intake manifold vacuum leaks

* Any damage to the MAP sensor housing

* Any damage to the MAP sensor seal

* A loose or improperly installed MAP sensor

* A restriction in the vacuum source of the MAP sensor