GENERAL DESCRIPTION

It is impossible to forge or machine a perfectly proportioned crankshaft wheel. Therefore, each crankshaft wheel produced will have minor variations in the spacing and/or width of its gear teeth.These variations (tooth error), if not compensated for, can cause false misfire detection. The Tooth Error Correction (TEC) Learn Algorithm determines engine-specific variation in crankshaft position sensing. Once TEC is learned, compensation factors are then calculated and used by the Misfire Diagnostic algorithm to improve the accuracy of engine positiondeterminations.Tooth error correction factors are normally learned only once during the life of a vehicle. However, if a vehicle controller, engine crankshaft, target wheel, or crank sensor is replaced or serviced, tooth error correction factors must be re-learned. This can be performed in a service environment with serial data commands.

DTC DESCRIPTION

Checking tooth error correction under detecting condition, if the TEC is out of Threshold value, PCM sets P0315.

DTC DETECTING CONDITION

Item

Detecting Condition

Possible cause

DTC Strategy

●

This DTC indicates that crankwheel tooth error has not been learned.

●

CKPS

●

Target wheel

●

PCM

Enable Conditions

●

12 ≤ Ignition Voltage ≤16 (V)

●

10 ≤ Engine load〈 90 (%)

●

1500 ≤ engine speed ≤ 4000 (rpm)

●

Vehicle speed 〈 5kph( 3.106856 mph)

●

Tec RPM stability timer 〉10sec

●

0℃(32°F)〈 coolant temp〈 110℃(230°F)

●

Not active disabling faults

●

Not key on disabling faults

Threshold value

●

Distance driven without learning tooth error ≥ 4000km(2485.484769 mile) or

●

Maximum allowed number of tooth error correction samples taken in the On The Road(OTR)learning mode〈 250 or

●

Sum of tooth error factors variation outside calibratable range ≥ 250

Diagnosis Time

●

Continuous

MIL On Condition

●

1 driving cycles

COMPONENT INSPECTION
1.

Visually check CKPS and target wheel

(1)

IG "OFF"

(2)

Check CKPS and target wheel for deformation or damage visually

(3)

Is the above items normal ?

▶ Go to "Verification of Vehicle Repair" procedure.

▶ Substitute with a known - good PCM and check for proper operation. If the problem is corrected, replace PCM and go to "Verification of Vehicle Repair" procedure.

note

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

VERIFICATION OF VEHICLE REPAIR

After a repair, it is essential to verify that the fault has been corrected.

1.

Monitor and record the Freeze Frame Data for the Diagnostic Trouble Code(DTC) which has been diagnosed.

2.

Using a Scantool, Clear the DTCs

3.

Operate the vehicle within conditions noted in the freeze frame data or enable conditions

4.

Monitor that all rediness test have been verified as " Complete "

5.

Are any DTCs present ?

▶ Go to the applicable troubleshoooting procedure.

▶ System is performing to specification at this time.

Яндекс.Метрика