2010 Cadillac Truck SRX FWD V6-3.0L Page 1442
4. Test for 4.8-5.2 V between the signal circuit terminal 2 and ground.
瀚慖f less than the specified range, test the signal circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the
K20 ECM.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
5. Ignition ON, engine OFF, using a 3 A jumper wire connected to ground, momentarily touch the crankshaft position sensor signal circuit
terminal 2 repeatedly. The crankshaft position active counter parameter should increment.
瀚慖f the crankshaft position active counter parameter does not increment, replace the K20 ECM.
瀚慖f the crankshaft position active counter increments, test or replace the B26 crankshaft position sensor.
Component Testing
Note: You must perform the Circuit/System Testing before proceeding with Component Testing.
1. Inspect the B26 crankshaft position sensor for looseness and correct installation. Remove the crankshaft position sensor from the engine and
inspect the sensor and the O-ring for damage.
瀚慖f the sensor is loose, incorrectly installed, or damaged, repair or replace the B26 crankshaft position sensor.
2. Connect the crankshaft position sensor connector to the crankshaft position sensor. Turn ON the ignition, with the engine OFF.
3. Observe the Crankshaft Position Active Counter parameter with a scan tool. Pass a flat steel object by the tip of the sensor repeatedly. The
crankshaft position active counter parameter should increment.
瀚慖f the function does not perform as specified, 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
P0336
DTC P0336 (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 P0336
- Crankshaft Position Sensor Performance
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.
