SFI SYSTEM, Diagnostic DTC:P0335, P0339

DTC Code	DTC Name
P0335	Crankshaft Position Sensor "A" Circuit
P0339	Crankshaft Position Sensor "A" Circuit Intermittent

DESCRIPTION

The crankshaft position sensor system consists of a crankshaft position sensor plate and a pickup coil.

The sensor plate has 34 teeth and is installed on the crankshaft. The pickup coil is made of wound copper wire, an iron core and magnet. The sensor plate rotates and, as each tooth passes by the pickup coil, a pulse signal is created. The pickup coil generates 34 signals per revolution. Based on these signals, the ECM calculates the crankshaft position and engine speed. Using these calculations, the fuel injection time and ignition timing are controlled.

DTC No.	DTC Detection Condition	Trouble Area
P0335	Either condition is met: No crankshaft position sensor signal is sent to the ECM while cranking (1 trip detection logic). No crankshaft position 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 sensor circuit Crankshaft position sensor Crankshaft (crank angle sensor plate) ECM
P0339	Under conditions (a), (b) and (c), no crankshaft position 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 switched from on to off.	Open or short in crankshaft position sensor circuit Crankshaft position sensor Crankshaft (crank angle sensor plate) ECM

DTC No.

DTC Detection Condition

Trouble Area

P0335

Either condition is met:

No crankshaft position sensor signal is sent to the ECM while cranking (1 trip detection logic).
No crankshaft position 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 sensor circuit
Crankshaft position sensor
Crankshaft (crank angle sensor plate)
ECM

P0339

Under conditions (a), (b) and (c), no crankshaft position 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.

Open or short in crankshaft position sensor circuit
Crankshaft position sensor
Crankshaft (crank angle sensor plate)
ECM

Reference: Inspection using an oscilloscope (VV1, VV2 and NE Signal Waveforms).

Tech Tips

The correct waveforms are as shown.
VV1+ and VV2+ are the VVT sensor signals, and NE+ is the crankshaft position sensor signal.
Grounding failure of the shielded wire may cause noise in the waveforms.

Item	Content
Terminal	VV1+ - VV1- VV2+ - VV2- NE+ - NE-
Equipment Setting	5 V/DIV., 20 msec./DIV.
Condition	Cranking or idling

Item

Content

Terminal

VV1+ - VV1-

VV2+ - VV2-

NE+ - NE-

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.

If the malfunction is not repaired successfully, a DTC is stored 10 seconds after the engine is next started.

WIRING DIAGRAM

INSPECTION PROCEDURE

Tech Tips

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

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

Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition 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

READ VALUE USING INTELLIGENT TESTER (ENGINE SPEED)
1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the tester on.
4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Engine Speed.
5. Start the engine.
6. Read the values displayed on the tester while the engine is running.
  
  OK
  
  Correct values are displayed.
  Tech Tips
  - To check the engine speed change, display the graph on the tester.
  - If the engine does not start, check the engine speed while cranking.
  - If the engine speed indicated on the tester remains at zero (0), there may be an open or short in the crankshaft position sensor circuit.
NG
INSPECT CRANKSHAFT POSITION SENSOR (RESISTANCE) Click here

OK

CHECK FOR INTERMITTENT PROBLEMS Click here
INSPECT CRANKSHAFT POSITION SENSOR (RESISTANCE)
1. Inspect the crankshaft position sensor Click here.
NG
REPLACE CRANKSHAFT POSITION SENSOR Click here

OK

OK
Correct values are displayed.

CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

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

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

Standard Resistance (Check for Open)

Tester Connection	Condition	Specified Condition
C14-1 - C34-6 (NE+)	Always	Below 1 Ω
C14-2 - C34-5 (NE-)	Always	Below 1 Ω

Standard Resistance (Check for Short)

Tester Connection	Condition	Specified Condition
C14-1 or C34-6 (NE+) - Body ground	Always	10 kΩ or higher
C14-2 or C34-5 (NE-) - Body ground	Always	10 kΩ or higher

Reconnect the crankshaft position sensor connector.
Reconnect the ECM connector.

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
SECURELY REINSTALL SENSOR Click here

OK
CHECK CRANK ANGLE 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 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

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

Read the DTCs.

Result
Result	Proceed to
No output	A
P0335 or P0339	B

Tech Tips

If the engine does not start, replace the ECM.

REPLACE ECM Click here

END