P0335 Crankshaft Position Sensor ‘A’ Circuit - 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 reference signals from CKPS under detecting condition, if any signal is detected for more than 0.15 sec., ECM sets P0335.

DTC DETECTING CONDITION

Item

Detecting Condition

Possible Cause

DTC Strategy

Check reference wave during cranking

1.	Poor connection

2.	Open in harness

3.	CKP sensor

ECM

Enable Conditions

IG “ON”, Cranking or engine-off during driving

No DTC related to CAM

Camshaft position sensor state change

Threshold value

No reference signal over 0.15 sec.

Diagnosis Time

0.15 sec.

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 voltages

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.

Approx. 2.5V

Is the measured voltage within specification ?

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

■ Check open in harness

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

2.	Measure resistance between low signal terminal of CKPS harness connector and CKPS low signal terminal of ECM harness connector.

Measure resistance between high signal terminal of CKPS harness connector and CKPS high signal terminal of ECM harness connector.

Below 1Ω

Is the measured resistance within specification ?

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

COMPONENT INSPECTION

■ 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 resistance within specification ?

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

Is the measured siganl 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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