The crankshaft position sensor (POS) is located on the oil pan facing the gear teeth (cogs) of the signal plate. It detects the fluctuation of the engine revolution.
The sensor consists of a permanent magnet and Hall IC.
When the engine is running, the high and low parts of the teeth cause the gap with the sensor to change.
The changing gap causes the magnetic field near the sensor to change.
Due to the changing magnetic field, the voltage from the sensor changes.
The ECM receives the voltage signal and detects the fluctuation of the engine revolution.
ECM receives the signals as shown in the figure.
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE 1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.
Turn ignition switch OFF and wait at least 10 seconds.
Turn ignition switch ON.
Turn ignition switch OFF and wait at least 10 seconds. TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5 V with ignition switch ON.
>> GO TO 2. 2.PERFORM DTC CONFIRMATION PROCEDURE
Start engine and let it idle for at least 5 seconds. If engine does not start, crank engine for at least 2 seconds.
Check 1st trip DTC. Is 1st trip DTC detected?
YES >> Go to Diagnosis Procedure.
NO >> Inspection END
YES >> GO TO 2.
NO >> Repair or replace ground connection. 2.CHECK CRANKSHAFT POSITION (CKP) SENSOR (POS) POWER SUPPLY CIRCUIT-I
Disconnect crankshaft position (CKP) sensor (POS) harness connector.
Turn ignition switch ON.
Check the voltage between CKP sensor (POS) harness connector and ground.
Is the Inspection result normal?
YES >> GO TO 8.
NO >> GO TO 3. 3.CHECK CRANKSHAFT POSITION (CKP) SENSOR (POS) POWER SUPPLY CIRCUIT-II
Turn ignition switch ON.
Disconnect ECM harness connector.
Check the continuity between CKP sensor (POS) harness connector and ECM harness connector.
Is the Inspection result normal?
YES >> GO TO 4.
NO >> Repair open circuit. 4.CHECK SENSOR POWER SUPPLY CIRCUIT
Check harness for short to power and short to ground, between the following terminals.
Is the Inspection result normal?
YES >> GO TO 5.
NO >> Repair short to ground or short to power in harness or connectors. 5.CHECK COMPONENTS
Check the following.
EVAP control system pressure sensor (Refer to See: P0451.)
YES >> GO TO 6.
NO >> Replace malfunctioning components. 6.CHECK APP SENSOR
Refer to See: P2122.
Is the Inspection result normal?
YES >> GO TO 12.
NO >> GO TO 7. 7.REPLACE ACCELERATOR PEDAL ASSEMBLY
8.CHECK CKP SENSOR (POS) GROUND CIRCUIT FOR OPEN AND SHORT
Turn ignition switch OFF.
Disconnect ECM harness connector.
Check the continuity between CKP sensor (POS) harness connector and ECM harness connector.
Also check harness for short to ground and short to power. Is the Inspection result normal?
YES >> GO TO 9.
NO >> Repair open circuit, short to ground or short to power in harness or connectors. 9.CHECK CKP SENSOR (POS) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
Check the continuity between CKP sensor (POS) harness connector and ECM harness connector.
Also check harness for short to ground and short to power. Is the Inspection result normal?
YES >> GO TO 10.
NO >> Repair open circuit, short to ground or short to power in harness or connectors. 10.CHECK CRANKSHAFT POSITION SENSOR (POS)
Refer to Component Inspection.
Is the Inspection result normal?
YES >> GO TO 11.
NO >> Replace crankshaft position sensor (POS). 11.CHECK GEAR TOOTH
Visually check for chipping signal plate gear tooth.
Is the Inspection result normal?
YES >> GO TO 12.
NO >> Replace the signal plate. 12.CHECK INTERMITTENT INCIDENT
Refer to See: Testing and Inspection\Initial Inspection and Diagnostic Overview\Service Information For Electrical Incident\Intermittent Incident.
>> Inspection END
Component Inspection 1.CHECK CRANKSHAFT POSITION SENSOR (POS)-I
Loosen the fixing bolt of the sensor.
Disconnect crankshaft position sensor (POS) harness connector.
Remove the sensor.
Visually check the sensor for chipping. Is the Inspection result normal?
YES >> GO TO 2.
NO >> Replace crankshaft position sensor (POS) 2.CHECK CRANKSHAFT POSITION SENSOR (POS)-II
Check resistance crankshaft position sensor (POS) terminals as per the following.
Is the Inspection result normal?
YES >> Inspection END
NO >> Replace crankshaft position sensor (POS)
