SFI SYSTEM, Diagnostic DTC:P0335, P0337, P0338

DTC Code	DTC Name
P0335	Crankshaft Position Sensor "A" Circuit
P0337	Crankshaft Position Sensor "A" Circuit Low Input
P0338	Crankshaft Position Sensor "A" Circuit High Input

DESCRIPTION

The crankshaft position sensor system consists of a crankshaft position sensor plate and Magnetic Resistance Element (MRE) type sensor. The crankshaft position sensor plate has 34 teeth at 10° intervals (2 teeth are missing for detecting top dead center), and is installed to the rear end of the crankshaft. The crankshaft position sensor outputs 34 rotation signals per engine revolution. The ECM uses the G2 signal to distinguish between the cylinders, and uses the NE signal to detect the crankshaft position and engine rpm.

DTC No.	DTC Detection Condition	Trouble Area
P0335	No crankshaft position (CKP) sensor signal to ECM while cranking (1 trip detection logic) When normal G2 signal is input, malfunctioning NE signal is input (1 trip detection logic) No CKP sensor signal to ECM at engine speed of 450 rpm or more (1 trip detection logic)	Open or short in crankshaft position (CKP) sensor circuit CKP sensor CKP sensor plate ECM
P0337	Output voltage of CKP sensor 0.3 V or less for 4 seconds (1 trip detection logic)	Open or short in CKP sensor circuit CKP sensor CKP sensor plate ECM
P0338	Output voltage of CKP sensor 4.7 V or more for 4 seconds (1 trip detection logic)	Open or short in CKP sensor circuit CKP sensor CKP sensor plate ECM

Reference: Inspection using an oscilloscope.

Tech Tips

The correct waveform is as shown.

G2+ stands for the camshaft position sensor signal, and NE+ stands for the CKP sensor signal.

Item	Content
Terminal	NE+ - NE- G2+ - G2-
Equipment Setting	5 V/DIV., 20 msec./DIV.
Condition	Cranking or idling

Item

Content

Terminal

NE+ - NE-

G2+ - G2-

Equipment Setting

5 V/DIV., 20 msec./DIV.

Condition

Cranking or idling

MONITOR DESCRIPTION

If there is no signal from the crankshaft position sensor despite the engine running, the ECM interprets this as a malfunction of the sensor.

When the sensor output voltage remains less than 0.3 V, or more than 4.7 V for more than 4 seconds, the ECM sets a DTC.

WIRING DIAGRAM

INSPECTION PROCEDURE

Tech Tips

The engine speed can be checked by using the intelligent tester. To check, follow the procedures below:

Connect the intelligent tester to the DLC3.
Turn the power switch on (READY).
Turn the tester ON.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Engine Speed.

The engine speed may be indicated as zero despite the engine running normally. This is caused by a lack of NE signals from the crankshaft position (CKP) sensor. Alternatively, the engine speed may be indicated as lower than the actual engine speed, if the CKP sensor output voltage is insufficient.

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

INSPECT CRANKSHAFT POSITION SENSOR (SENSOR POWER SOURCE)

Disconnect the E54 crankshaft position (CKP) sensor connector.

Measure the voltage according to the value(s) in the table below.

Standard voltage

Tester Connection	Switch Condition	Specified Condition
E54-3 (VC) - Body ground	Power switch on (IG)	4.5 to 5.0 V

CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM) Click here

CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

Disconnect the E54 crankshaft position (CKP) sensor connector.
Disconnect the E1 ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open)

Tester Connection	Condition	Specified Condition
E54-1 (NE) - E1-27 (NE+)	Always	Below 1 Ω
E54-2 (NE-) - E1-34 (NE-)	Always	Below 1 Ω

Standard resistance (Check for short)

Tester Connection	Condition	Specified Condition
E54-1 (NE) or E1-27 (NE+) - Body ground	Always	10 kΩ or higher
E54-2 (NE-) or E1-34 (NE-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)
1. Check the crankshaft position sensor installation.
  
  OK
  
  Sensor is installed correctly.
NG
TIGHTEN SENSOR Click here

OK
CHECK CRANKSHAFT POSITION SENSOR PLATE (TEETH OF SENSOR PLATE)
1. Check the teeth of the sensor plate.
  
  OK
  
  Sensor plate does not have any cracks or deformation.
NG
REPLACE CRANKSHAFT POSITION SENSOR PLATE Click here

OK
REPLACE CRANKSHAFT POSITION SENSOR
1. Replace the crankshaft position sensor Click here.
NEXT

OK
Sensor is installed correctly.

OK
Sensor plate does not have any cracks or deformation.

CHECK WHETHER DTC OUTPUT RECURS (DTC P0335, P0337 AND/OR P0338)

Connect the intelligent tester to the DLC3.
Turn the power switch on (IG).
Turn the tester ON.
Clear DTCs Click here.
Put the engine in inspection mode Click here.
Enter the following menus: Powertrain / Engine and ECT / DTC.

Read the DTCs.

Result
Display (DTC Output)	Proceed to
No output	A
P0335, P0337 and/or P0338	B

Tech Tips

If the engine does not start, replace the ECM.

REPLACE ECM Click here

END

CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

Disconnect the E54 crankshaft position sensor connector.
Disconnect the E1 ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open)

Tester Connection	Condition	Specified Condition
E54-3 (VC) - E1-18 (VC)	Always	Below 1 Ω

Standard resistance (Check for short)

Tester Connection	Condition	Specified Condition
E54-3 (VC) or E1-18 (VC) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE ECM Click here