DTC P0335 or P0336

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5135716 Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC P0335 Crankshaft Position Sensor Circuit DTC P0336 Crankshaft Position Sensor Performance Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performanc
5 V Reference	P0335, P0651*	P0335	P0335, P0651*	P0336
Signal	P0335, P0506	P0335, P0506	P0335	P0336
Low Reference	—	P0335, P0506	—	P0336
* Additional DTCs may set

Circuit/System Description

Circuit	Description
5 V Reference	Regulated voltage supplied by the control module.
Signal	The control module input circuit has an internal resistance connected to 5 V.
Low Reference	Grounded through the control module.

	Component	Description
	B26 Crankshaft Position Sensor	The sensor contains a hall-effect sensor and additional electronics that processes the signal. It detects the change of strength of the magnetic field caused by the reluctor ring. When the strength
	© 2023 General	Mcohtaonrgs.e s A, ltlh reig shetns sroers ecrhvaendg.es the amount of current it

Component	Description
	consumes. This results in a square wave signal of current and voltage. The control module detects the frequency in which the signal changes, which is proportional to the rotational speed.
K20 Engine Control Module	The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the engine actuators accordingly.
Reluctor Ring	There are 58 teeth or invisible magnetic segments on the edge of the crankshaft position reluctor ring mounted on the crankshaft. Each tooth or magnetic segment on the ring is spaced at a 60 segment spacing with 2 missing segments for a reference gap.

The ECM uses information from the crankshaft position sensor and the camshaft position sensor(s) for sequencing and timing of the spark events. Conditions for Running the DTC P0335 Condition 1 DTC P0101, P0102, P0103 = Not set MAF Sensor = Greater than 2.0 g/s Condition 2 M64 Starter Motor = Active Camshaft Position Sensor = Signal received Condition 3 M64 Starter Motor = Inactive Engine = Running Condition 4 DTC P0340, P0341 = Not set Engine = Running Condition 5 DTC P0340, P0341 = Not set M64 Starter Motor = Active Frequency the DTC runs = Continuously — After the running conditions are met P0336 Condition 1 DTC P0335 = Not set Engine Speed = Greater than 450 RPM MAF Sensor = Greater than 2.0 g/s Condition 2 M64 Starter Motor = Inactive Engine = Running Condition 3 DTC P0101, P0102, P0103 = Not set MAF Sensor = Greater than 2.0 g/s Condition 4 M64 Starter Motor = Active Camshaft Position Sensor = Signal received Condition 5 DTC P0340, P0341 = Not set Engine = Running Condition 6 DTC P0340, P0341 = Not set M64 Starter Motor = Active Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC P0335 Condition 1 Crankshaft Position Sensor = No Signal — For greater than 4 s Condition 2 Crankshaft Position Sensor = No Signal — For greater than 0.3 s Condition 3 Crankshaft Position Sensor = No Signal — During 2 engine revolution(s) P0336 Condition 1 Crankshaft Position Sensor = Signal synchronization lost 10 times within 10 s. Condition 2 Crankshaft Position Sensor = Sync gap not detected — For greater than 0.4 s Condition 3 Crankshaft Position Sensor = Sync gap not detected — Since last starter engagement — For greater than 1.5 s Condition 4 Crankshaft Position Sensor = Less than 1 pulse(s) or Greater than 65,000 pulses — During 1 engine revolution(s) — For 8 out of 10 engine revolutions Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type A DTC Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type A DTC Reference Information Schematic Reference Engine Controls Schematics Connector End View Reference Master Electrical Component List Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs DTC Type Reference Powertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool Reference Control Module References Circuit/System Verification

1. Ignition » On / Vehicle » In Service Mode
2. Verify DTC P0651 is not set. ⇒ If the DTC is set Refer to: DTC P0641, P0651, P0697, or P06A3 ⇓ If the DTC is not set
3. Engine » Running
4. Verify DTC P0336 is not set. ⇒ If the DTC is set Refer to: Circuit/System Testing ⇓ If the DTC is not set
5. Verify the scan tool parameter: Crankshaft Position Active Counter = Increments ⇒ If the parameter value does not increment Refer to: Circuit/System Testing ⇓ If the parameter value increments
6. Verify the scan tool parameter: Crankshaft Position Resync Counter = 0 Counts — The engine should not stumble/stall. Perform the action while monitoring the parameter: Wiggle the harness and connector: B26 Crankshaft Position Sensor Wiggle the harness and connector: K20 Engine Control Module ⇒ If greater than 0 counts Repair as necessary » Wiring / Terminal(s) / Electrical Connector(s) ⇓ If 0 counts
7. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. Verify the DTC does not set. ⇒ If the DTC sets Refer to: Circuit/System Testing ⇓ If the DTC is not set
8. All OK. Circuit/System Testing

Note

It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

1. Ignition/Vehicle & All vehicle systems » Off
2. Disconnect the electrical connector: B26 Crankshaft Position Sensor
3. Test for less than 10 Ω between the test points: Low Reference circuit terminal 2 & Ground ⇒ If 10 Ω or greater 3.1. Disconnect the electrical connector: K20 Engine Control Module 3.2. Test for less than 2 Ω between the test points: Low Reference circuit terminal 2 @ Component harness & The other end of the circuit @ Control module harness ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K20 Engine Control Module ⇓ If less than 10 Ω
4. Ignition » On / Vehicle » In Service Mode
5. Test for 4.8 to 5.2 V between the test points: 5 V Reference circuit terminal 1 & Ground ⇒ If less than 4.8 V 5.1. Ignition/Vehicle » Off 5.2. Disconnect the electrical connector: K20 Engine Control Module 5.3. Test for infinite resistance between the test points: 5 V Reference circuit terminal 1 @ Component harness & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇓ If infinite resistance 5.4. Test for less than 2 Ω between the test points: 5 V Reference circuit terminal 1 @ Component harness & The other end of the circuit @ Control module harness ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K20 Engine Control Module ⇒ If greater than 5.2 V 5.1. Ignition/Vehicle » Off 5.2. Disconnect the electrical connector: K20 Engine Control Module 5.3. Ignition » On / Vehicle » In Service Mode 5.4. Test for less than 1 V between the test points: 5 V Reference circuit terminal 1 @ Component harness & Ground ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇒ If less than 1 V » Replace the component: K20 Engine Control Module ⇓ If between 4.8 and 5.2 V
6. Rapidly tap a 3 A fused jumper wire between the test points: Signal circuit terminal 3 & Ground Verify the scan tool parameter: Crankshaft Position Active Counter = Increments ⇒ If the parameter value does not increment 6.1. Ignition/Vehicle » Off 6.2. Disconnect the electrical connector: K20 Engine Control Module 6.3. Ignition » On / Vehicle » In Service Mode 6.4. Test for less than 1 V between the test points: Signal circuit terminal 3 @ Component harness & Ground ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇓ If less than 1 V 6.1. Ignition/Vehicle » Off 6.2. Test for infinite resistance between the test points: Signal circuit terminal 3 @ Component harness & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇓ If infinite resistance 6.3. Test for less than 2 Ω between the test points: Signal circuit terminal 3 @ Component harness & The other end of the circuit @ Control module harness ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K20 Engine Control Module ⇓ If the parameter value increments
7. Verify DTC P0336 is not set. ⇒ If the DTC is set Verify the following conditions do not exist: B26 Crankshaft Position Sensor & Reluctor Ring — Excessive play / Foreign material passing between the components / Incorrect air gap / Incorrect installation / Loose / Visible Damage Camshaft Sprocket — Visible Damage / Worn Crankshaft Sprocket — Visible Damage / Worn Engine Oil — Contaminated / Dirty Timing Chain or Timing Belt — Visible Damage / Worn Timing Chain Tensioner or Timing Belt Tensioner — Visible Damage / Worn ⇒ If a condition exists » Repair or replace as necessary ⇒ If no condition exists » Test or replace the component: B26 Crankshaft Position Sensor ⇓ If the DTC is not set
8. Test or replace the component: B26 Crankshaft Position Sensor Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Crankshaft Position Sensor Replacement For control module replacement, programming, and setup refer to: Control Module References