DTC Advanced Diagnostics: P0339
DTC P0339:Crankshaft Position (CKP) Sensor Circuit Intermittent Interruption

General Description

The crankshaft position (CKP) sensor consists of a pulse plate and a semiconductor that detects rotor position. When the engine starts, the pulse plate turns and the magnetic flux in the semiconductor device changes. The changes of magnetic flux are converted into pulsing signals to the powertrain control module (PCM). The CKP sensor detects injection/ignition timing for each cylinder and the engine speed. If an abnormal amount of pulsing signals from the CKP sensor are detected, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Continuous
Sequence
None
Duration
0.5 second
DTC Type
One drive cycle, MIL on

Enable Conditions
Condition
Minimum
Maximum
Vehicle speed [Vehicle Speed]
1 mph (1 km/h)
15 mph (25 km/h)
Other
Starter in active or engine speed [Engine Speed] more than 600 rpm
[ ]: HDS Parameter

Malfunction Threshold
Any of the conditions is met continuously at least 8 times:
The engine speed calculated from tooth time period is lower than 20 rpm or higher than 12,000 rpm.
More than 60 tooth counts between detected gaps.
The ratio of current tooth time to previous tooth time exceeds 1.5 - 2 if gap is not expected.
The ratio of current tooth time to previous tooth time exceeds 3.38 - 8 if gap is expected.

Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
CKP sensor loose connection or poor contact
Change of gap between CKP sensor and pulse plate (eccentric pulse plate, large gap, loose CKP sensor mounting, CKP sensor movement)
Noise disturbance by starter
Noise disturbance by drive pulse for injection and ignition
Pulse plate defection
CKP sensor failure

Confirmation Procedure
Operating Condition
1.
Start the engine. Hold the engine speed [Engine Speed] at 3,000 rpm without load (in neutral) until the radiator fan comes on.
2.
Drive the vehicle at vehicle speed [Vehicle Speed] 15 mph (25 km/h) or less for at least 1 second.
Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command.