PRE-RELEASE
DTC P0339 (LLU)
| DTC P0339 (LLU) |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptor |
DTC P0339 00
Crankshaft Position Sensor Circuit Intermittent
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
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5V Reference
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P0122 00, P0222 00, P0335 00
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P0335 00
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P0123 00, P0221 00, P0335 00
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P0336 00
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Signal Circuit
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P0335 00
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P0335 00, P0337 00
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P0335 00
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P0336 00, P0339 00
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Low Reference
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-
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P0335 00, P0337 00
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P0123 00, P0335 00
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P0336 00
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| 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 representing the crankshaft reluctor wheel to the ECM while the wheel teeth spin past the crankshaft position sensor. The ECM uses each signal pulse from the crankshaft position sensor to determine the crankshaft speed, and decodes the reference gap on the crankshaft decoder wheel to determine the crankshaft position. The information is then used to establish the correct sequence for engine ignition and fuel injection. The ECM also uses output from the crankshaft position sensor to determine the camshaft position relative to the crankshaft, in order to detect when a cylinder is misfiring.
| Conditions for Running the DTC |
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The engine is cranking or running.
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This DTC runs continuously once the above conditions are met for greater than 5 s.
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| Conditions for Setting the DTC |
The crankshaft position sensor input is not continuous when the engine is running.
| Action Taken When the DTC Sets |
DTC P0339 00 is a Type B DTC.
| Conditions for Clearing the DTC |
DTC P0339 00 is a Type B DTC.
| Reference Information |
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Verification |
| 1. |
Try to start the engine while observing the DTC information with a scan tool. DTC P0339 00 should not be set.
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| 2. |
Engine cranking, observe the scan tool Engine Speed parameter. The scan tool should indicate a steady 200-300 RPM while cranking.
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| 3. |
Move related harnesses/connectors of the crankshaft position sensor and verify the engine does not stumble, stall, or change engine speed.
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| 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.
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| Circuit/System Testing |
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If the B26 Crankshaft Position Sensor lead is damaged in any way, replace the B26 Crankshaft Position Sensor. |
| 1. |
Ignition OFF, disconnect the harness connector at the B26 Crankshaft Position Sensor.
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| 2. |
Ignition OFF, test for less than 5 Ω between the low reference circuit terminal 2 and ground.
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| 3. |
If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
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| 4. |
Ignition ON, engine OFF, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.
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| 5. |
If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
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| 6. |
If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
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Ignition ON, engine OFF, test for 4.8-5.2 V between the signal circuit terminal 1 and ground.
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| 8. |
If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
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| 9. |
If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
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| 10. |
If all circuits and components test normal, test or replace the B26 Crankshaft Position Sensor.
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| Component Testing |
| Note | ||
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You must perform the circuit/system testing before proceeding with component testing. |
Static Test
| 1. |
Ignition OFF, disconnect the harness connector at the B26 Crankshaft Position Sensor.
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| 2. |
Inspect the sensor and the O-ring for damage.
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| 3. |
If the sensor is loose, incorrectly installed, or damaged, replace the B26 Crankshaft Position Sensor.
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| 4. |
Test for 1 850-2 450 Ω at 20°C (68°F) between the signal circuit terminal 1 and the low reference circuit terminal 2.
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| 5. |
If not within the specified range, replace the B26 Crankshaft Position Sensor.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Crankshaft Position Sensor Replacement
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Control Module References
for ECM replacement, setup, and programming
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