2010 Cadillac CTS Sedan AWD V6-3.6L Page 1309
Component Connector End Views (See: Diagrams/Connector Views)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information
Circuit/System Testing
Note: The Crankshaft Position System Variation Learn Procedure may have to be repeated up to 5 times before the procedure is successful.
1. Perform the Crankshaft Position System Variation Learn (w/LF1) (See: Powertrain Management/Computers and Control
Systems/Crankshaft Position Sensor/Testing and Inspection). The scan tool should display Learned this Ignition.
2. If the Crankshaft Position System Variation Learn Procedure cannot be performed successfully, inspect for the following conditions:
* Worn crankshaft main bearings
* A damaged or misaligned reluctor wheel
* Excessive crankshaft runout
* A damaged crankshaft-Refer to Crankshaft and Bearing Cleaning and Inspection (See: Engine, Cooling and Exhaust/Engine/Service and
Repair/Overhaul/52. Crankshaft and Bearing Cleaning and Inspection).
* Interference in the signal circuit of the crankshaft position sensor
* The ignition switch is in the ON position until there is insufficient system voltage.
* An ECM power disconnect with the ignition ON that may have erased the crankshaft position system variation values and set DTC P0315
* Debris between the crankshaft position sensor and the reluctor wheel
瀚慖f the control module is unable to complete the learn procedure, replace the control module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) prior to using this diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning)for ECM replacement, setup, and programming
P0324
DTC P0324 (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 P0324
- Knock Sensor Module Performance
Circuit/System Description
The knock sensor is a piezoelectric device that produces an AC voltage of different amplitude and frequency depending on the level of engine
mechanical vibration. The knock sensor system monitors the knock sensor in order to determine if detonation or spark knock is present. If the
knock sensor system determines that excessive knock is present, the engine control module (ECM) retards the spark timing based on the signal
from the knock sensor system. The knock sensor produces an AC signal when specific frequencies are detected. The ECM then retards the timing
until knock is controlled.
The ECM tests the functionality of the internal knock sensor signal evaluation circuitry. The knock sensor circuitry within the ECM is responsible
for receiving, amplifying, filtering, and evaluating the AC voltage and frequency from the knock sensors. The ECM performs three tests that
determine if the internal circuitry within the ECM is functioning correctly.
Test One
The ECM internally turns OFF the knock sensor signal circuits. The ECM then applies different test signals to the internal knock sensor circuitry to
