P0315 Crankshaft Position System Variation Not Learned - Automotive Repair Guides & Equipment

COMPONENT LOCATION

GENERAL DESCRIPTION

The Crankshaft Position Sensor (CKPS) is a magnetic generator type sensor that generates voltage using a sensor and a target wheel mounted on the crankshaft. There are 58 slots in the target wheel with one longer slot. When the slot in the wheel aligns with the sensor, the sensor voltage output is low. When the metal (tooth) in the wheel aligns with the sensor, the sensor voltage output is high. During one crankshaft rotation there are 58 signwave signals with one longer signal. The ECM calculates engine RPM by using the sensor’s signal and controls the injection timing and the ignition timing. Using the signal differences caused by the longer slot, the ECM identifies which cylinder is at top dead center.

DTC DESCRIPTION

Checking tooth error correction under detecting condition, if the TEC(Tooth Error Correction) is out of Threshold value, ECM sets P0315.

DTC DETECTING CONDITION

Item

Detecting Condition

Possible Cause

DTC Strategy

This DTC indicates that crank wheel tooth error has not been learned.

1.	loosened CKPS

2.	Target wheel

ECM

Enable Conditions

10% ≤ Engine load < 90%

2000 rpm ≤ engine speed ≤ 4000 rpm

TEC(Tooth Error Correction) RPM stability timer > 10sec

0°C(32°F) < coolant temperature < 110°C(230°F)

Not active disabling faults

Threshold value

Distance driven without learning(during fuel cut off) tooth error ≥ 4000km

Acutal Value is higher or lower than calibrated value

Diagnosis Time

–

MIL On Condition

NO MIL ON(DTC only)

MONITOR GDS DATA

1.	Connect GDS to Data Link Connector(DLC).

IG “ON”.

3.	Select “DTC” button, and then Press “DTC Status” to check DTC’s information from the DTCs menu.

4.	Read “DTC Status” parameter.

Is parameter displayed “Present fault”?

	▶ Go to “Component Inspection” procedure.
	▶ Fault is intermittent caused by ECM memory was not cleared after repair. Erase DTC and drive the vehicle to satisfy the enable condition then, go to ” Component Inspection” procedure.

COMPONENT INSPECTION

■ Visually check CKPS and target wheel

IG “OFF

2.	Visually check CKPS is loosened or target wheel is deformed or damaged.

Is the above items normal ?

▶ Substitute with a known – good ECM and check for proper operation. If the problem is corrected, replace ECM and go to “Verification of Vehicle Repair” procedure.

There is a memory reset function on GDS that can erase optional parts automatically detected and memorized by ECM. Before or after testing ECM on the vehicle, use this function to reuse the ECM on the others

▶ Repair or replace as necessary

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