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

DTC No.	DTC Detection Condition	Trouble Area
P0335	When one of the following conditions is met (1 trip detection logic) : No crankshaft position sensor signal to ECM while cranking No crankshaft position sensor signal to ECM while engine speed 600 rpm or more	Open or short in crankshaft position sensor circuit Crankshaft position sensor Crankshaft position sensor plate ECM
P0339	Under conditions (a), (b) and (c), no crankshaft position sensor signal to ECM for 0.05 seconds or more: (1 trip detection logic) (a) Engine speed 1000 rpm or more (b) Starter signal OFF (c) 3 seconds or more have elapsed since starter signal switched from ON to OFF	Open or short in crankshaft position sensor circuit Crankshaft position sensor Crankshaft position sensor plate ECM

DTC No.

DTC Detection Condition

Trouble Area

P0335

When one of the following conditions is met (1 trip detection logic) :

No crankshaft position sensor signal to ECM while cranking
No crankshaft position sensor signal to ECM while engine speed 600 rpm or more

Open or short in crankshaft position sensor circuit
Crankshaft position sensor
Crankshaft position sensor plate
ECM

P0339

Under conditions (a), (b) and (c), no crankshaft position sensor signal to ECM for 0.05 seconds or more:

(1 trip detection logic)

(a) Engine speed 1000 rpm or more

(b) Starter signal OFF

Open or short in crankshaft position sensor circuit
Crankshaft position sensor
Crankshaft position sensor plate
ECM


*a	5 V/DIV.
*b	20 ms./DIV.

Reference: Inspection using an oscilloscope.

Tech Tips

The correct waveform is as shown.
G2+ is camshaft position sensor signals, and NE+ is the crankshaft position sensor signal.
A failure of the ground for the shielding of the wiring may result in noisy waveforms.

ECM Terminal Name

CH1: Between G2+ and NE-

CH2: Between NE+ and NE-

Tester Range

5 V/DIV., 20 ms./DIV.

Condition

Idling

MONITOR DESCRIPTION

If there is no signal from the crankshaft position sensor despite the crankshaft 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 a DTC.

CONFIRMATION DRIVING PATTERN

Start the engine and run it at idle for 20 seconds or more.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

Tech Tips

After performing the inspection procedure for the crankshaft position sensor, if DTC P0335 and/or P0339 are output again, check the following items related to the camshaft position sensor.

Installation condition of the camshaft position sensor
Installation condition of the camshaft
Connection of the camshaft position sensor connector

If no problem is found through this diagnostic troubleshooting procedure, troubleshoot the engine mechanical systems.
Check the engine speed. The engine speed can be checked using the intelligent tester. To check, follow the operation 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 rotating 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 intelligent tester.
  - If the engine does not start, check the engine speed while cranking.
  - If the engine speed indicated on the intelligent tester remains at zero (0), there may be an open or short in the crankshaft position sensor circuit.
OK
CHECK FOR INTERMITTENT PROBLEMS Click here

NG
INSPECT CRANKSHAFT POSITION SENSOR (RESISTANCE)
1. Inspect the crankshaft position sensor (See page ENGINE CONTROL (1NZ-FE) > CRANKSHAFT POSITION SENSOR > INSPECTION).
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
B25-1 - B23-78 (NE+)	Always	Below 1 Ω
B25-2 - B23-110 (NE-)	Always	Below 1 Ω

Standard Resistance (Check for Short)

Tester Connection	Condition	Specified Condition
B25-1 or B23-78 (NE+) - Body ground	Always	10 kΩ or higher
B25-2 or B23-110 (NE-) - Body ground	Always	10 kΩ or higher

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

REPAIR OR REPLACE HARNESS OR CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)

Text in Illustration
*a	OK
*b	NG
*c	Clearance

Check the crankshaft position sensor installation.

OK

Sensor is installed correctly.

OK
Sensor is installed correctly.

SECURELY REINSTALL CRANKSHAFT POSITION SENSOR Click here

INSPECT CRANKSHAFT (TEETH OF CRANKSHAFT POSITION SENSOR PLATE)
1. Inspect the teeth of the crankshaft position sensor plate.
  
  OK
  
  Crankshaft position sensor plate does not have any cracks or deformation.
NG
REPLACE CRANKSHAFT (CRANKSHAFT POSITION SENSOR PLATE) Click here

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

OK
Crankshaft position 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 and run it at idle for 20 seconds or more.
Enter the following menus: Powertrain / Engine and ECT / DTC.

Read the DTCs.

Result

Result	Proceed to
DTC is not output	A
DTC P0335 and/or P0339 are output	B

Tech Tips

If the engine does not start, replace the ECM.

END

REPLACE ECM Click here