SFI SYSTEM (w/o EGR System), Diagnostic DTC:P0335

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

DESCRIPTION

The crankshaft position sensor system consists of a No. 1 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 engine 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	When either of following conditions are met: (1 trip detection logic) Missing crankshaft position sensor signal despite camshaft position sensor signal inputs normal after engine cranked No crankshaft position sensor signal to the ECM	Open or short in crankshaft position sensor circuit Crankshaft position sensor No. 1 crankshaft position sensor plate ECM

DTC No.

DTC Detection Condition

Trouble Area

P0335

When either of following conditions are met:

(1 trip detection logic)

Missing crankshaft position sensor signal despite camshaft position sensor signal inputs normal after engine cranked

No crankshaft position sensor signal to the ECM

Open or short in crankshaft position sensor circuit
Crankshaft position sensor
No. 1 crankshaft position sensor plate
ECM

Reference: Inspection using an oscilloscope.

Tech Tips

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	Between NE+ and NE-
Tester Range	5 V/DIV., 20 ms./DIV.
Condition	Idling with warm engine

WIRING DIAGRAM

INSPECTION PROCEDURE

Tech Tips

After performing the inspection procedure for the crankshaft position sensor, if DTC P0335 is 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.
Turn the power switch on (IG) and turn the tester on.
Put the engine in inspection mode (maintenance mode) Click here.
Start the engine.
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. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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 power switch on (IG).
3. Turn the tester on.
4. Put the engine in inspection mode (maintenance mode) Click here.
5. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Engine Speed.
6. Start the engine.
7. 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 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
D27-1 (NE+) - D28-74 (NE+)	Always	Below 1 Ω
D27-2 (NE-) - D28-120 (NE-)	Always	Below 1 Ω

Standard Resistance (Check for Short)

Tester Connection	Condition	Specified Condition
D27-1 (NE+) or D28-74 (NE+) - Body ground	Always	10 kΩ or higher
D27-2 (NE-) or D28-120 (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)
1. Check the crankshaft position sensor installation.
  
  OK
  
  Crankshaft position sensor is installed correctly.
NG
SECURELY REINSTALL CRANKSHAFT POSITION SENSOR Click here

OK
INSPECT NO. 1 CRANKSHAFT POSITION SENSOR PLATE (TEETH OF SENSOR PLATE)
1. Check the teeth of the No. 1 crankshaft position sensor plate Click here.
  
  OK
  
  Sensor plate does not have any cracks or deformation.
NG
REPLACE NO. 1 CRANKSHAFT POSITION SENSOR PLATE Click here

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

OK
Crankshaft position sensor is installed correctly.

OK
Sensor plate does not have any cracks or deformation.

CHECK WHETHER DTC OUTPUT RECURS (DTC P0335)

Connect the intelligent tester to the DLC3.
Turn the power switch on (IG).
Turn the tester on.
Clear the DTCs Click here.
Put the engine in inspection mode (maintenance mode) Click here.
Start the engine and wait for 20 seconds.
Enter the following menus: Powertrain / Engine and ECT / DTC.

Read the DTCs.

Result
Result	Proceed to
DTC is not output	A
DTC P0335 is output	B

Tech Tips

If the engine does not start, replace the ECM.

REPLACE ECM Click here

END