2010 Cadillac CTS Sedan AWD V6-3.6L Page 1338
瀚慖f greater than the specified range, test for an open/high resistance in the low reference circuit. If the circuits/connections test normal,
replace the K20 ECM.
4. Install the fuse that supplies B+ to terminal 56-X2 of the K20 ECM.
5. Ignition ON, test for greater than 4.8 V between the 5 V reference circuit terminal 3 and the low reference circuit terminal 1.
瀚慖f less than the specified value, test the 5 V reference circuit for a short to ground or for an open/high resistance. If the
circuits/connections test normal, replace the K20 ECM.
瀚慖f greater than the specified value, test the 5 V reference circuit for a short to voltage. If the circuits/connections test normal, replace the
K20 ECM.
6. Test for 4.8-5.2 V between the signal circuit terminal 2 and ground.
瀚慖f the voltage is greater than specified range, test for a short to voltage in the signal circuit. If circuit/connections test normal, replace the
K20 ECM.
瀚慖f the voltage is less than the specified range, test for a short to ground or an open/high resistance in the signal circuit. If
circuit/connections test normal, replace the K20 ECM.
7. If all circuits/connections test normal, test or replace the B26 crankshaft position sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Crankshaft Position Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Crankshaft Position
Sensor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
P0340
DTC P0340, P0345, P0365, or P0390 (w/LF1)
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 P0340
- Intake Camshaft Position Sensor Circuit Bank 1
DTC P0345
- Intake Camshaft Position Sensor Circuit Bank 2
DTC P0365
- Exhaust Camshaft Position Sensor Circuit Bank 1
DTC P0390
- Exhaust Camshaft Position Sensor Circuit Bank 2
Diagnostic Fault Information
Circuit/System Description
The 4X camshaft position sensor circuits consist of an engine control module (ECM) supplied 5 V reference circuit, low reference circuit, and an
