Description
The camshaft position (cmp) sensor consists of a magnet and an iron core which is wrapped with copper wire, and is installed onto the cylinder head. When the camshaft rotates, each of 3 teeth on the camshaft passes through the cmp sensor. This activates the internal magnet in the sensor, generating a voltage in the copper wire. The camshaft rotation is synchronized with the crankshaft rotation. When the crankshaft turns twice, the voltage is generated 3 times in the cmp sensor. The generated voltage in the sensor acts as a signal, allowing the ecm to locate the camshaft position. This signal is then used to control ignition timing, fuel injection timing, and the vvt system.
Hint:
Dtc p0340 indicates a malfunction relating to the cmp sensor (+) circuit (the wire harness between the ecm and cmp sensor, and the cmp sensor itself).
Reference: inspection using an oscilloscope
Hint:
Monitor description
If no signal is transmitted by the cmp sensor despite the engine revolving, or the rotation of the camshaft and the crankshaft is not synchronized, 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
Typical enabling conditions
Typical malfunction thresholds
Component operating range
Wiring diagram
Refer to dtc p0335 (see page es-174).
Inspection procedure
Hint:
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.
Standard resistance
Hint:
Terms cold and hot refer to the temperature of the sensor. Cold means approximately -10° to 50°c (14 °to 122°f). Hot means approximately 50° to 100°c (122°to 212°f).
Standard resistance (check for open)
Standard resistance (check for short)
Ok: sensor is installed correctly.
Ok: camshaft teeth do not have any cracks or deformation.
Hint:
If the engine does not start, replace the ecm.
Lubrication system
On-vehicle inspection
Check engine oil level
Warm up the engine, stop the engine and wait for 5
minutes.
Check that the engine oil level is between the l and
f marks of the oil dipstick.
If low, check for leakage and add oil up to the f
mark.
Notice:
Do not add engine oil a ...
Problem symptoms table
Hint:
Use the table below to help determine the cause of the
problem symptom. The potential causes of the symptoms are
listed in order of probability in the "suspected area" column
of the table. Check each symptom by checking the suspected
areas in the order they are listed. Replace p ...
Inspection
Inspect camshaft position sensor
Measure the resistance of the sensor.
Standard resistance
Notice:
Cold and hot mean the temperature of the coils
themselves. Cold is from -10 to 50°c (14 to 122
°f) and hot is from 50 to 100°c (122 to 212°f).
If the result is not as specif ...