P0336 Crankshaft Position Sensor ‘A’ Circuit Range/Performance

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 output signals from CKPS every 7.8 sec. under detecting condition, if an output signal is missing or redundant for more than 1.56 sec., ECM sets P0336.

DTC DETECTING CONDITION

Item

Detecting Condition

Possible Cause

DTC Strategy

Detecting extra/missing pulses between consecutive 58X reference pulses

1.	Poor connection

Noise

3.	Short in harness

4.	Target wheel

ECM

Enable Conditions

Engine running state

Threshold value

Extra / missing pulses > 2 pulses

Diagnosis Time

Continuous (More than 1.56 sec.failure for every 7.8 sec.test)

MIL On Condition

3 Driving Cycles

SPECIFICATION

Item	Specification
Coil Resistance (Ω)	774 ~ 946 [20°C(68°F)]
Airgap (mm)	0.5 ~ 1.5 mm

DIAGNOSTIC CIRCUIT DIAGRAM

SIGNAL WAVEFORM & DATA

Fig.1) Normal waveforms of CKPS & CMPS

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 “Terminal and Connector inspection” procedure.
	▶ Fault is intermittent caused by poor contact in the sensor’s and/or ECM’s connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, ending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary

TERMINAL AND CONNECTOR INSPECTION

1.	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.

2.	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 ” Signal Circuit Inspection ” procedure.

SIGNAL CIRCUIT INSPECTION

■ Check voltage

1.	IG “OFF” and disconnect CKPS connector.

IG “ON”.

3.	Measure voltage between low signal terminal of CKPS harness connector and chassis ground.

Measure voltage between high signal terminal of CKPS harness connector and chassis ground.

Specification : Approx. 2.5V

Is the measured voltage within specification ?

	▶ Go to “Component Inspection” procedure.
	▶ Go to “Check short in harness” as follows.

■ Check short in harness

1.	IG “OFF” and disconnect CKPS connector and ECM connector.

2.	Measure resistance between low(high) signal terminal of CKPS harness connector and chassis ground.(Measurement “A”)

Measure resistance between low signal and high signal terminals of CKPS harness connector.(Measurement “B”)

Specification : Infinite

Is the measured resistance within specification?

	▶ Go to “Component Inspection” procedure.
	▶ Repair short in harness

COMPONENT INSPECTION

■ Visually check CKPS and target wheel

IG “OFF”

2.	Check CKPS and target wheel for deformation or damage visually

Is the above items normal ?

	▶ Go to “Check CKPS resistance” as follows.
	▶ Repair or replace it, and go to “Verification of Vehicle Repair” procedure.

■ Check CKPS

1.	IG “OFF” and disconnect CKPS connector.

Measure resistance between low signal and high signal terminals of CKPS connector.(Component side)

774 ~ 946Ω [20°C(68°F)]

Is the measured siganl waveform normal?

	▶ Go to “Check signal waveform of CKPS” as follows.
	▶ 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.

■ Check signal waveform of CKPS

1.	IG “OFF” and connect GDS.

2.	ENG “ON” and Measure signal waveform at signal terminal of CKPS. Fig.1) Normal waveforms of CKPS & CMPS

Is the measured signal waveform normal?

	▶ Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary, 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

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