DTC P0335, P0336, or P0338 (LAU)
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DTC P0335, P0336, or P0338 (LAU)
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DTC P0335
Crankshaft Position Sensor Circuit
DTC P0336
Crankshaft Position Sensor Performance
DTC P0338
Crankshaft Position Sensor Circuit High Duty Cycle
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Signal Performance
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5-Volt Reference
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P0122, P0222, P0335, P0698, P2127
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P0335, P0697
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P0335, P0338, P0699
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P0336, P0697, P0698, P0699
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Crankshaft Position Sensor Signal
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P0122, P0222, P0335, P0698, P2127
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P0335
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P0335, P0338, P0699
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P0336, P0698, P0699
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Low Reference
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P0335
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P0335
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-
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P0336
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Circuit/System Description
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The crankshaft position sensor is located on the rear of bank 1 of the engine block. The crankshaft position sensor is a hall effect switch that works in conjunction with a 58X reluctor wheel that is attached to the crankshaft. Each tooth on the reluctor wheel is spaced 6 degrees apart with one span having a 12 degree space. The engine control module (ECM) uses the 12 degree space to determine top dead center (TDC) for cylinders 1 and 4. The ECM determines when cylinder 1 is on the compression stroke by monitoring the crankshaft position sensor and the camshaft position sensors. The ECM can synchronize the ignition timing, fuel injector timing, and spark knock control based on the crankshaft position sensor and the camshaft position sensor inputs.
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Conditions for Running the DTC
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The engine is cranking or running.
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The ECM has detected greater than 12 camshaft revolutions.
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The DTC P0335 and P0336 run continuously once the above conditions are met for greater than 5 seconds.
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The DTC P0338 runs once each engine revolution once the above conditions are met for greater than 2 seconds.
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Conditions for Setting the DTC
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P0335
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The ECM does not detect a signal from the crankshaft position sensor.
OR
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The ECM detects a crankshaft position signal with out reference pulse for greater than 3 revolutions, 6 revolutions for LLT.
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Either condition exists for greater than 1 second or a cumulative of 10 seconds.
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P0336
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The ECM re-syncs the engine position 6 or more times during an ignition cycle.
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The ECM re-syncs the engine position 2,600 or more times during an ignition cycle, for LLT.
OR
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The ECM detects 28 or more interruptions in the engine speed signal during an ignition cycle.
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Either condition exists for greater than 1 second or a cumulative of 10 seconds.
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P0338
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The ECM detects a difference of greater than 8 teeth between reference gap position pulses.
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The ECM detects a difference of greater than 250 teeth between reference gap position pulses, for LLT.
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The condition exists for greater than 1 second or a cumulative of 10 seconds.
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Action Taken When the DTC Sets
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DTCs P0335, P0336, and P0338 are Type A DTCs.
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Conditions for Clearing the DTC
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DTCs P0335, P0336, and P0338 are Type A DTCs.
The following conditions could also set the DTCs:
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Physical damage to the crankshaft position sensor or the reluctor wheel
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Excessive play or looseness of the crankshaft position sensor or the reluctor wheel
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Improper installation of the crankshaft position sensor or the reluctor wheel
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Foreign material passing between the crankshaft position sensor and the reluctor wheel
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Excessive air gap between the crankshaft position sensor and the reluctor wheel
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The ECM uses the camshaft position sensors to determine engine speed and position when there is a crankshaft position sensor condition.
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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.
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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.
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Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Electronic Ignition System Description
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
for scan tool information
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Circuit/System Verification
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1.
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Ignition ON, check the diagnostic trouble code (DTC) information with a scan tool. DTCs P0697, P0698 or P0699 should not set.
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3.
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Clear the DTC information with a scan tool. Attempt to start the engine. Check the DTC Info with a scan tool. DTCs P0335, P0336 or P0338 should not set.
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4.
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Check the diagnostic tool's parameters for the crankshaft position's resync. The parameter must always display zero. Transfer the crankshaft position sensor's harnesses/connections at the same time as checking the parameter. Verify the engine does not stumble or stall, and the parameter does not increase.
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5.
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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.
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1.
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Ignition OFF, remove the fuse that supplies B+ to terminal 56-X2 of the ECM.
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2.
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Disconnect the harness connector at the crankshaft position sensor.
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3.
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Test for 5 Ω or less between the low reference circuit terminal 1 and ground.
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4.
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If 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.
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5.
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Install the fuse that supplies B+ to terminal 56-X2 of the ECM.
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6.
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Ignition ON, test for greater than 4.8 V between the 5-volt reference circuit terminal 3 and the low reference circuit terminal 1.
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7.
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If 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.
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8.
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Test for 4.8-5.2 V between the signal circuit terminal 2 and ground.
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9.
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If 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.
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10.
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If 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.
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11.
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If all circuits/connections test normal, test or replace the crankshaft position sensor.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
