2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2105

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2105

* Excess deposits in the Q38 throttle body. Refer to Throttle Body Cleaning (See: Powertrain Management/Fuel Delivery and Air

Induction/Throttle Body/Service and Repair/Procedures)

* Restricted exhaust

* Mechanical conditions that limits engine speed

* Parasitic load on the engine-For example, a transmission condition, a belt driven accessory condition.

瀚慖f a condition is found, repair as necessary.

P0507

* Vacuum leaks

* A throttle valve that does not close correctly

* Verify the correct operation of the crankcase ventilation system. Inspect for the following conditions:

- The routing of the positive crankcase ventilation (PCV) system

- Vacuum leaks in the PCV system-Refer to Crankcase Ventilation System Inspection/Diagnosis (See: Powertrain Management/Emission

Control Systems/Positive Crankcase Ventilation/Testing and Inspection)

瀚慖f a condition is found, repair as necessary.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

P0507

DTC P0506 or P0507

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provide an overview of each diagnostic category.

DTC Descriptors

DTC P0506

- Idle Speed Low

DTC P0507

- Idle Speed High

Circuit/System Description

The throttle actuator control (TAC) motor is controlled by the engine control module (ECM). The DC motor located in the throttle body drives the

throttle blade. In order to decrease idle speed, along with spark and fuel delivery changes the ECM commands the throttle closed reducing air flow

into the engine and the idle speed decreases. In order to increase idle speed, the ECM commands the throttle plate open allowing more air to pass

the throttle plate.

Conditions for Running the DTC

* DTCs P0068, P0101, P0102, P0103, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0171, P0172, P0174,

P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0221, P0222, P0223, P0300-P0308, P0351-P0358, P0461-

P0463, P0496, P0502, P0503, P0606, P0722, P0723, P0806-P0808, P1516, P2066-P2068, P2101, P2135, P2227-P2230 are not set.

* The engine is operating for at least 60 s.

* The engine is idling for greater than 10 s.

* The barometric pressure (BARO) is greater than 70 kPa (11 psi).

* The engine coolant temperature (ECT) is greater than 60掳C (140掳F).

* The intake air temperature (IAT) is warmer than -20掳C (-4掳F).

* The vehicle speed is less than 3 km/h (2 mph).

* The commanded engine speed is steady within 25 RPM.

* The transmission is not changing gears.

* The torque converter clutch (TCC) is not changing states.

* The manual transmission clutch pedal position is between 20-88 percent - If equipped.

* The manual transmission clutch is not depressed - If equipped.

* The power take-off (PTO) is not active - If equipped.

* The transfer case is not in 4WD Low - If equipped.