SFI SYSTEM(w/o Secondary Air Injection System), Diagnostic DTC:P0335, P0337, P0338, P0339

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
P0339	Crankshaft Position Sensor "A" Circuit Intermittent

DESCRIPTION

The Crankshaft Position (CKP) 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 crankshaft revolution. The ECM uses the G2 signal to distinguish between the cylinders, and uses the NE signal to detect the crankshaft position and engine speed.

DTC Code	DTC Detection Condition	Trouble Area
P0335	No Crankshaft Position (CKP) sensor signal is sent to the ECM while cranking (1 trip detection logic). No CKP sensor signal is sent to the ECM at an engine speed of 600 rpm or more (1 trip detection logic).	Open or short in Crankshaft Position (CKP) sensor circuit CKP sensor CKP sensor plate ECM
P0337	The output voltage of the CKP sensor is 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	The output voltage of the CKP sensor is 4.7 V or higher for 4 seconds (1 trip detection logic).	Open or short in CKP sensor circuit CKP sensor CKP sensor plate ECM
P0339	Under conditions (a), (b) and (c), no CKP sensor signal is sent to the ECM for 0.05 seconds or more (1 trip detection logic): (a) The engine speed is 1000 rpm or more. (b) The starter signal is OFF. (c) 3 seconds or more have elapsed since the starter signal was switched from ON to OFF.	Open or short in CKP sensor circuit CKP sensor CKP sensor plate ECM


*a	NE and G2 Signal Waveform
*b	5 V/DIV.
*c	20 msec./DIV.

Reference: Inspection using an oscilloscope.

Standard

Tester Connection	Tool Setting	Condition	Specified Condition
C45-110 (NE+) - C45-111 (NE-)	5 V/DIV., 20 msec./DIV.	Cranking or idling	The correct waveform is as shown
C45-90 (G2) - C45-89 (G2-)	5 V/DIV., 20 msec./DIV.	Cranking or idling	The correct waveform is as shown

Tech Tips

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

MONITOR DESCRIPTION

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

When the sensor output voltage remains at below 0.3 V, or higher than 4.7 V for more than 4 seconds, the ECM stores DTC(s).

WIRING DIAGRAM


*a	Crankshaft Position Sensor

CAUTION / NOTICE / HINT

Tech Tips

If no problem is found by this diagnostic troubleshooting procedure, check for problems by referring to the engine mechanical section.
The engine speed can be checked by using the intelligent tester. To check, follow the procedures below:

Connect the tester to the DLC3.
Start the engine.
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 revolving normally. This is caused by a lack of NE signals from the Crankshaft Position (CKP) sensor. Alternatively, the engine speed may be indicated as less 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 running or stopped, 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

READ VALUE USING INTELLIGENT TESTER (ENGINE SPEED)
1. Connect the intelligent tester to the DLC3.
2. Turn the engine switch on (IG) and turn the tester on.
3. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Engine Speed.
4. Start the engine.
5. Read the values displayed on the tester while the engine is running.
  
  Standard
  
  Correct values are displayed.
  Tech Tips
  - To check the engine speed change, display the graph on the intelligent tester.
  - If the engine does not start, check the engine speed while cranking.
  - If the engine speed indicated on the intelligent tester remains zero (0), there may be an open or short in the Crankshaft Position (CKP) sensor circuit.
OK
CHECK FOR INTERMITTENT PROBLEMS Click here

NG

Standard
Correct values are displayed.

INSPECT CRANKSHAFT POSITION SENSOR (SENSOR POWER SOURCE)


*1	Front view of wire harness connector: (to Crankshaft Position Sensor)

Disconnect the C114 crankshaft position sensor connector.

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

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
C114-3 (VC) - Body ground	Engine 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 C114 crankshaft position sensor connector.
Disconnect the C45 ECM connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
C114-1 (NE+) - C45-110 (NE+)	Always	Below 1 Ω
C114-2 (NE-) - C45-111 (NE-)	Always	Below 1 Ω
C114-1 (NE+) or C45-110 (NE+) - Body ground	Always	10 kΩ or higher
C114-2 (NE-) or C45-111 (NE-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)
*1 Clearance
1. Check the crankshaft position sensor installation.
  
  OK
  
  Sensor is installed correctly.
NG
SECURELY REINSTALL 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

*1	Clearance

OK
Sensor is installed correctly.

OK
Sensor plate does not have any cracks or deformation.

CHECK WHETHER DTC OUTPUT RECURS (DTC P0335, P0337, P0338 AND/OR P0339)

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

Read DTCs.

Result
Result	Proceed to
No output	A
P0335, P0337, P0338 and/or P0339	B

Tech Tips

If the engine does not start, replace the ECM.

END

REPLACE ECM Click here

CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

Disconnect the C114 crankshaft position sensor connector.
Disconnect the C45 ECM connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
C114-3 (VC) - C45-66 (VCV2)	Always	Below 1 Ω
C114-3 (VC) or C45-66 (VCV2) - Body ground	Always	10 kΩ or higher

REPLACE ECM Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR