P0337, P0338

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

DESCRIPTION

Refer to DTC P0335.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P0337	Crankshaft Position Sensor "A" Circuit Low Input	Output voltage of crankshaft position sensor less than 0.3 V for 4 seconds (1 trip detection logic).	Open or short in crankshaft position sensor circuit Crankshaft position sensor ECM	Comes on	DTC stored
P0338	Crankshaft Position Sensor "A" Circuit High Input	Output voltage of crankshaft position sensor higher than 4.7 V for 4 seconds (1 trip detection logic).	Open or short in crankshaft position sensor circuit Crankshaft position sensor ECM	Comes on	DTC stored


*a	2 V/DIV.
*b	20 ms./DIV.

Reference: Inspection using an oscilloscope.

Tech Tips

The correct waveform is as shown.

ECM Terminal Name	Between NE+ and NE-
Tester Range	2 V/DIV., 20 ms./DIV.
Condition	Idling with warm engine

MONITOR DESCRIPTION

If the output voltage transmitted by the crankshaft position sensor remains low or high, the ECM interprets this as a malfunction in the sensor circuit, illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Required Sensors/Components (Main)	Crankshaft position sensor
Required Sensors/Components (Related)	Camshaft position sensor
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the engine switch off and wait for at least 30 seconds.
Turn the engine switch on (IG).
Turn the GTS on.
Start the engine.
Idle the engine for 20 seconds or more [A].
Enter the following menus: Powertrain / Engine / Trouble Codes [B].
Read the pending DTCs.
Tech Tips
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P0337 or P0338.

Check the DTC judgment result.

GTS Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

Tech Tips

If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform steps [A] and [B] again.

WIRING DIAGRAM

Refer to DTC P0335.

Click here

CAUTION / NOTICE / HINT

Tech Tips

If no problem is found through this diagnostic troubleshooting procedure, troubleshoot the engine mechanical system.
The engine speed can be checked by using the GTS. To perform the check, follow the procedures below:

Connect the GTS to the DLC3.
Start the engine.
Turn the GTS on.
Enter the following menus: Powertrain / Engine / 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 GTS. 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 GTS (ENGINE SPEED)

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Data List / All Data / Engine Speed.

Powertrain > Engine > Data List

Tester Display

Engine Speed
Start the engine.

Tester Display
Engine Speed

Read the values displayed on the GTS while the engine is running.

Standard
Correct values are displayed.

Tech Tips

To check the engine speed change, display the graph on the GTS.
If the engine does not start, check the engine speed while cranking.
If the engine speed indicated on the GTS remains zero (0), there may be an open or short in the crankshaft position sensor circuit.

Result

Proceed to
OK
NG

OK

CHECK FOR INTERMITTENT PROBLEMS Click here

NG

CHECK HARNESS AND CONNECTOR

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

Disconnect the crankshaft position sensor connector.
Turn the engine switch on (IG).

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

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
E1-3 (VC) - Body ground	Engine switch on (IG)	4.5 to 5.5 V
E1-1(NE) - Body ground	Engine switch on (IG)	3.0 to 5.5 V

Turn the engine switch off and wait for at least 30 seconds.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
E1-3(VC) - E1-1(NE)	Engine switch off	1.425 to 1.575 kΩ
E1-2(NE-) - Body ground	Always	Below 1 Ω

Result

Proceed to
OK
NG

OK

REPLACE CRANKSHAFT POSITION SENSOR Click here

NG

CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

Disconnect the crankshaft position sensor connector.
Disconnect the VVT sensor (for intake camshaft) connectors.
Disconnect the VVT sensor (for exhaust camshaft) connectors.
Disconnect the camshaft position sensor connector.
Disconnect the canister pump module connector.
Disconnect the ECM connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
E1-1 (NE) - G42-134 (NE+)	Always	Below 1 Ω
E1-2 (NE-) - G42-102 (NE-)	Always	Below 1 Ω
E1-3 (VC) - G42-90 (VC)	Always	Below 1 Ω
E1-1 (NE) or G42-134 (NE+) - Body ground and other terminals	Always	10 kΩ or higher
E1-2 (NE-) or G42-102 (NE-) - Body ground and other terminals	Always	10 kΩ or higher
E1-3 (VC) or G42-90 (VC) - Body ground and other terminals	Always	10 kΩ or higher

Result

Proceed to
OK
NG

OK

REPLACE ECM Click here

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

SFI SYSTEM(w/ Canister Pump Module), Diagnostic DTC:P0337, P0338