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.
Before refueling the vehicle
Close all the doors and windows, and turn the engine switch to the
“lock” position (vehicles without a smart key system) or off (vehicles
with a smart key system).
Confirm the type of fuel.
Fuel types
Unleaded gasoline (octane rating 87 [research octane number 91] or
higher)
Cauti ...
Automatic
air conditioning system
Air outlets and fan speed are automatically adjusted according
to the temperature setting.
Driver’s side temperature control
dial
Automatic mode button
Micro dust and pollen filter
mode button
Driver’s side temperature setting
display
Fan speed display
Air outlet display ...
Check and replace ecu
Notice:
The connector should not be disconnected from
the ecu. Perform the inspection from the
backside of the connector on the wire harness
side.
When no measuring condition is specified,
perform the inspection with the engine stopped
and the ignition switch on.
Check that the con ...