2010 Cadillac CTS Sedan AWD V6-3.6L Page 1326
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate B68 knock sensor.
Note: If the voltage is not within the specified range on either circuit, test for a wire to wire short, to ground or voltage between the knock
sensor circuits.
2. Ignition ON, test for 2-3 V between the signal circuit terminal A and ground.
瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuits/connections test
normal, replace the K20 ECM.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuits/connections test normal, replace the K20
ECM.
3. Test for 2-3 V between the low reference circuit terminal B and ground.
瀚慖f less than the specified range, test the low reference circuit for a short to ground or an open/high resistance. If the circuits/connections
test normal, replace the K20 ECM.
瀚慖f greater than the specified range, test the low reference circuit for a short to voltage. If the circuits/connections test normal, replace the
K20 ECM.
4. If all circuits/connections test normal, replace the B68 knock sensor sensor.
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
P0332
DTC P0326, P0327, P0328, P0331, P0332, or P0333 (w/LLT)
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 P0326
- Knock Sensor Performance Bank 1
DTC P0327
- Knock Sensor Circuit Low Voltage Bank 1
DTC P0328
- Knock Sensor Circuit High Voltage Bank 1
DTC P0331
- Knock Sensor Performance Bank 2
DTC P0332
- Knock Sensor Circuit Low Voltage Bank 2
DTC P0333
- Knock Sensor Circuit High Voltage Bank 2
Circuit/System Description
