2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2476

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2476

6. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

Warning

Turn OFF the ignition before inserting fingers into the throttle bore. Unexpected movement of the throttle blade could cause personal injury.

1. Ignition OFF, verify the following conditions do not exist with the throttle body assembly:

* A throttle blade that is not in the rest position

* A throttle blade that is binding open or closed

* A throttle blade that is free to move open or closed without spring pressure

瀚慖f a condition is found, replace the throttle body assembly.

Note: Disconnecting the throttle body harness connector may cause additional DTCs to set.

2. Ignition OFF, disconnect the harness connector at the throttle body assembly.

3. Ignition ON, verify that a test lamp does not illuminate between each control circuit listed below and ground.

* TAC Motor Control Closed circuit terminal A

* TAC Motor Control Open circuit terminal B

瀚慖f test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. Ignition ON, verify that a test lamp does not illuminate between each control circuit listed below and B+.

* TAC Motor Control Closed circuit terminal A

* TAC Motor Control Open circuit terminal B

瀚慖f the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.

5. Ignition OFF, set the DMM to the 40 V scale, select the Min/Max Recording Mode, and set the Peak Min/Max response time to 1 ms.

Note:

* The DMM Min/Max Recording Mode and the response time of 1 ms must be reset after testing each circuit or a lower voltage will be

recorded.

* The ignition must be OFF and the ECM completely powered down before testing each circuit or a lower voltage will be recorded.

6. Ignition OFF, measure the voltage using the DMM Min/Max Recording Mode function on each circuit listed below as the ignition is turned

ON. The Max voltage should be within 1 V of B+.

* TAC Motor Control Closed circuit terminal A

* TAC Motor Control Open circuit terminal B

瀚慖f not within the specified range, test the circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

7. If all circuits and connections test normal, replace the throttle body assembly.

Repair Instructions

* Throttle Body Assembly Replacement (See: Powertrain Management/Fuel Delivery and Air Induction/Throttle Body/Service and

Repair/Removal and Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for Engine Control Module replacement,

programming, and setup

Repair Verification

1. Install any components that have been removed or replaced during diagnosis.

2. Perform any adjustments, programming or setup procedures that are required when a component is removed or replaced.

3. Clear the DTCs with a scan tool.

4. Turn OFF the ignition for 60 s.

Note: If the Throttle Sweep Test is not available on the scan tool, use the accelerator to perform the test. Refer to Diagnostic Aids for further

details.

5. Perform the Throttle Sweep Test while observing the TAC Motor parameter with a scan tool. The TAC Motor parameter should display