2010 Cadillac CTS Sedan AWD V6-3.6L Page 837
瀚慖f less than the specified range, test the circuits for a short to ground or an open/high resistance. If the circuits test normal, replace the
K20 ECM.
瀚慖f greater than the specified range, test the circuits for a short to voltage. If the circuits test normal, replace the K20 ECM.
4. If the circuits test normal, replace the appropriate B68 knock sensor.
P06B6 and P06B7
* Verify that the following DTCs are not set: DTC P0325, P0327, P0328, P0330, P0332 and P0333.
瀚慖f any of the DTCs are set, diagnose them first.
* DTCs P06B6 and P06B7 indicate an internal ECM circuitry failure. Replace the K20 ECM if no external knock sensor circuit issues exist.
Component Testing
1. Connect the DMM between the B68 knock sensor signal circuit terminal A and the B68 knock sensor signal circuit terminal B on the sensor
side of the appropriate B68 knock sensor harness connector.
2. Set the DMM to the 400 mV AC hertz scale and wait for the DMM to stabilize at 0 Hz.
Note: DO NOT tap on plastic engine components.
3. Tap on the engine block with a non-metallic object near the B68 knock sensor while observing the signal indicated on the DMM.
4. The DMM should display a fluctuating frequency while tapping on the engine block.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Knock Sensor Replacement - Bank 1 (See: Powertrain Management/Computers and Control Systems/Knock Sensor/Service and
Repair/Knock Sensor Replacement - Bank 1)
* Knock Sensor Replacement - Bank 2 (See: Powertrain Management/Computers and Control Systems/Knock Sensor/Service and
Repair/Knock Sensor Replacement - Bank 2)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
P0008
DTC P0008 or P0009
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) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0008
- Engine Position System Performance Bank 1
DTC P0009
- Engine Position System Performance Bank 2
Circuit/System Description
The engine control module (ECM) tests for a misalignment between both camshafts on one bank of the engine and the crankshaft. The
misalignment would be at an idler sprocket for either bank or at the crankshaft. Once the ECM learns the position of both camshafts on one bank of
the engine, the ECM compares the learned values to a reference value. The ECM will set a DTC if both learned values for one bank of the engine
are exceeding a calibrated threshold in the same direction.
Conditions for Running the DTC
* DTC P0010, P0011, P0013, P0014, P0020, P0021, P0023, P0024, P0341, P0342, P0343, P0346, P0347, P0348, P0366, P0367, P0368,
P0391, P0392, P0393, P2088, P2089, P2090, P2091, P2092, P2093, P2094, or P2095 is not set.
* The engine is operating for greater than 50 seconds.
* The engine coolant temperature is between 0-95掳C (32-203掳F).
