2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1280
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
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 Verification
1. Ignition ON, observe the DTC information with a scan tool. DTC P0697, P0698, or P0699 should not be set.
瀚慖f a DTC is set, refer to DTC P0641-P0643, P0651-P0653, or P0697-P0699 (ECM, LAU) ( See: P Code Charts/P0641/ECM).
2. Clear the DTC Info with a scan tool. Attempt to start the engine, observe the DTC information with a scan tool. DTC P0335, P0336, or
P0338 should not set.
3. Observe the scan tool crankshaft position Resync parameter, the parameter should always display zero. Move the related
harnesses/connectors of the crankshaft position sensor while observing the parameter, verify the engine does not stumble, or stall, and the
parameter does not increment.
4. 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
1. Ignition OFF, remove the fuse that supplies B+ to terminal 56-X2 of the ECM.
2. Disconnect the harness connector at the crankshaft position sensor.
3. Test for 5 ohm or less between the low reference circuit terminal 1 and ground.
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 ECM.
4. Install the fuse that supplies B+ to terminal 56-X2 of the ECM.
5. Ignition ON, test for greater than 4.8 V between the 5-volt reference circuit terminal 3 and the low reference circuit terminal 1.
瀚慖f less than the specified value, test for an open/high resistance in the 5-volt reference circuit. If the circuits/connections test normal,
replace the 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
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 ECM.
7. If all circuits/connections test normal, test or replace the 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 engine control module replacement, setup, and
programming
P0338
DTC P0335, P0336, or P0338 (LAU)
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
