2010 Cadillac Truck SRX FWD V6-3.0L Page 1440

2010 Cadillac Truck SRX FWD V6-3.0L Page 1440

1. Using a scan tool, verify the following DTCs are not set: P0325, P0327, P0328, P0330, P0332, and P0333.

瀚慖f any of the DTCs are set, diagnose them first.

2. DTCs P06B6 and P06B7 indicate an internal ECM circuitry failure. Verify the external knock sensor circuits and connectors for proper

condition.

瀚慖f no external knock sensor circuit issues exist, replace the K20 ECM.

Repair Instructions

* 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

Repair Verification

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

P0335

DTC P0335 (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 Descriptor

DTC P0335

- Crankshaft Position Sensor Circuit

Diagnostic Fault Information

Circuit/System Description

The crankshaft position sensor circuits consist of an engine control module (ECM) supplied 5 V reference circuit, low reference circuit and an

output signal circuit. The crankshaft position sensor is an internally magnetic biased digital output integrated circuit sensing device. The sensor

detects magnetic flux changes of the teeth and slots of a 58-tooth reluctor wheel on the crankshaft. Each tooth on the reluctor wheel is spaced at

60-tooth spacing, with 2 missing teeth for the reference gap. The crankshaft position sensor produces an ON/OFF DC voltage of varying frequency,

with 58 output pulses per crankshaft revolution. The frequency of the crankshaft position sensor output depends on the velocity of the crankshaft.

The crankshaft position sensor sends a digital signal, which represents an image of the crankshaft reluctor wheel, to the ECM as each tooth on the

wheel rotates past the crankshaft position sensor. The ECM uses each crankshaft position signal pulse to determine crankshaft speed and decodes

the crankshaft reluctor wheel reference gap to identify crankshaft position. This information is then used to determine the optimum ignition and

injection points of the engine. The ECM also uses crankshaft position sensor output information to determine the camshaft relative position to the

crankshaft, to control camshaft phasing, and to detect cylinder misfire.

Conditions for Running the DTC

* DTCs P0101, P0102, P0103, P0340, P0341, P0641, or P0651 P0697 are not set.

* The engine is cranking or running.

* The airflow into the engine is greater than 3 g/s.

* The DTC runs continuously when the above conditions are met.

Conditions for Setting the DTC