Toyota RAV4 manuals

Toyota Sienna Service Manual: Crankshaft Position Sensor

Crankshaft Position Sensor

DESCRIPTION

The Crankshaft Position (CKP) sensor system consists of a CKP sensor plate and a pickup coil. The sensor plate has 34 teeth and is installed on the crankshaft. The pickup coil is made of an iron core and a magnet.

The sensor plate rotates as each tooth passes through the pickup coil, and 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 RPM. Using these calculations, the fuel injection time and ignition timing are controlled.

Crankshaft Position Sensor

Reference: Inspection using an oscilloscope

HINT:

MONITOR DESCRIPTION

If there is no signal from the CKP sensor despite the engine revolving, the ECM interprets this as a malfunction of the sensor.

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

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

COMPONENT OPERATING RANGE

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

(a) Connect the intelligent tester to the DLC3.

(b) Start the engine.

(c) Turn the tester on.

(d) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / ENGINE SPD.

The engine speed may be indicated as zero despite the engine revolving normally. This is caused by a lack of NE signals from the Crankshaft Position (CKP) sensor. Alternatively, the engine speed may be indicated as lower than the actual engine speed, if the CKP sensor voltage output is insufficient.

1 INSPECT CRANKSHAFT POSITION SENSOR (RESISTANCE)

INSPECT CRANKSHAFT POSITION SENSOR (RESISTANCE)

(a) Disconnect the C22 Crankshaft Position (CKP) sensor connector.

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

Standard resistance

HINT:

Terms "cold" and "hot" refer to the temperature of the coils. "Cold" means approximately -10 to 50°C (14 to 122°F). "Hot" means approximately 50 to 100°C (122 to 212°F).

(c) Reconnect the CKP sensor connector

2 CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

(a) Disconnect the C22 CKP sensor connector.

(b) Disconnect the E11 ECM connector.

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

Standard resistance :

(d) Reconnect the ECM connector.

(e) Reconnect the CKP sensor connector.

3 CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)

CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)

(a) Check the CKP sensor installation condition.

OK: Sensor is installed correctly.

4 CHECK CRANKSHAFT POSITION SENSOR PLATE (TEETH OF SENSOR PLATE)

(a) Check the teeth of the sensor plate.

OK: Sensor plate does not have any cracks or deformation.

REPLACE ECM (See page ES-498)

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