2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1277

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1277

Diagnostic Aids

The following conditions could also set the DTCs:

* Physical damage to the crankshaft position sensor or the reluctor wheel

* Excessive play or looseness of the crankshaft position sensor or the reluctor wheel

* Improper installation of the crankshaft position sensor or the reluctor wheel

* Foreign material passing between the crankshaft position sensor and the reluctor wheel

* Excessive air gap between the crankshaft position sensor and the reluctor wheel

* The ECM uses the camshaft position sensors to determine engine speed and position when there is a crankshaft position sensor condition.

* The engine will operate with a crankshaft position sensor condition only if the ECM has stored the learned reference position of the

camshafts in memory. With a crankshaft position sensor condition the engine will go into a limp home mode after a restart. The ECM then

calculates engine speed from one of the camshaft position sensors.

* An intermittent condition in the camshaft position sensor circuits can cause a crankshaft position DTC to set. Inspect the camshaft position

sensor, harness connections, and related wiring, if you suspect this condition.

Reference Information

Schematic Reference

Engine Controls Schematics (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Electronic Ignition System Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Electronic

Ignition System Description)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* 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,