3.
Monitor the "CKP" parameters on the scantool.
The Crankshaft Position Sensor (CKPS) is a hall effect type sensor that generates voltage using a sensor and a target wheel mounted on the crankshaft; there are 28 slots in the target wheel where one is longer than the others. When the slot in the wheel aligns with the sensor, the sensor voltage outputs low. When the metal (tooth) in the wheel aligns with the sensor, the sensor voltage outputs high. During one crankshaft rotation there are 28 rectangular signals and one longer signal. The ECM calculates engine RPM by using the sensor’s signal and controls the injection duration and the ignition timing. Using the signal differences caused by the longer slot, the ECM identifies which cylinder is at top dead center.
If CKPS cannot find reference mark during 8 times or more, PCM sets DTC P0335.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Reference mark check | ● Poor connection ● Open or short in signal circuit ● CKPS ● PCM |
Enable Conditions | ||
Threshold Value | ● No reference mark 〉 8 times | |
Diagnostic Time | ● Continuous | |
MIL ON Condition | ● 3 driving cycle |
Connect scantool to DLC(Data Link Cable).
Engine start.
Monitor the "CKP" parameters on the scantool.
Are the parameters displayed correctly?
▶ Fault is intermittent caused by poor contact in the sensor’s and/or ECM’s connector or wasrepaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poorconnection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of vehicle Repair" procedure.
▶ Go to "Terminal and Connector Inspection" procedure.
Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
▶ Repair as necessary and go to "Verification of vehicle Repair" procedure.
▶ Go to "CKPS circuit inspection" procedure.
Key "OFF".
Disconnect CKPS connector.
Key "ON".
Measure the voltage between terminal 3 of CKPS harness connector and chassis ground.
Specification : Approx 12V
Is the measured voltage within specification ?
▶ Go to "Check signal circuit" procedure.
▶ Repair Short to ground or Open in Power circuit, and then go to "Verification of Vehicle Repair" procedure.
Key "OFF".
Disconnect CKPS connector.
Key "ON".
Measure the voltage between terminal 2 of CKPS harness connector and chassis ground.
Specification : Approx 8V
Is the measured voltage within specification ?
▶ Go to "Check Ground circuit" procedure.
▶ Repair Short or Open in Signal circuit, and then go to "Verification of Vehicle Repair" procedure.
Key "OFF".
Disconnect CKPS connector.
Measure the resistance between 3 of CKPS harness connector and chassis ground.
Measure the resistance between 1 and 3 of CKPS harness connector.
Specification : "A" - "B" = Below 200mV
Is the measured voltage within specifications ?
▶ Go to "Component inspection" procedure.
▶ Repair Open in ground circuit and then, go to "Verification of Vehicle Repair" procedure.
Check CKPS.
Key "ON". (Don't disconnect sensors.)
Select "vehicle scopemeter" in the menu, and connect channel A of scantool with terminal 1 of CKPS harness connector.
Engine start. And check the signal waveforms.
Is the measured signal waveform O.K?
▶ 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.
▶ Substitute with a known - good CKPS and check for proper operation.
▶ If the problem is corrected, replace CKPS and go to "Verification of Vehicle Repair" procedure.
After a repair, it is essential to verify that the fault has been corrected.
Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
Clear the DTCs and Operate the vehicle within DTC Enable conditions in General information.
Are any DTCs present ?
▶ Go to the applicable troubleshooting procedure.
▶ System is performing to specification at this time.
