P0340

DTC P0340 Camshaft Position Sensor Circuit Malfunction:

Camshaft Position Sensor Circuit:

CIRCUIT DESCRIPTION
The Camshaft Position (CMP) sensor is used to indicate camshaft position so that the Vehicle Control Module-A (VCM-A) can determine which cylinder is misfiring when misfire is present. It is also used to check for a properly installed distributor. DTC P0340 is a type "B" DTC.

DTC P0340 WILL SET WHEN
Engine running cam sensor reference pulse is not seen once every 6 cylinders. (incorrect ratio of cam to crank pulse).

ACTION TAKEN (VCM-A WILL DEFAULT TO)
The VCM-A will turn "ON" the Malfunction Indicator Lamp (MIL) (Service Engine Soon) after two consecutive driving cycles with the fault active.

DTC PO34O WILL CLEAR WHEN
The VCM-A will turn the MIL "OFF" after three consecutive trips without a fault condition present. A history DTC will be cleared if no fault conditions have been detected for forty warm-up cycles [coolant temperature has risen 22°C (40°F) from start-up coolant temperature and engine coolant temperature exceeds 71°C (160°F) that same ignition cycle] or the Tech 1 clearing feature has been used.

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This step determines if DTC P0340 is the result of a hard failure or an intermittent condition.
2. Determines if voltage is available to the CMP through the VCM-A.
3. If the feed circuit is shorted to ground, the test light will be "ON." This step determines if the circuit is open or shorted to ground. If the circuit is OK, then the VCM-A connections or VCM-A is faulty.

DIAGNOSTIC AIDS
An intermittent problem may be caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation.

Any circuitry, that is suspected as causing the intermittent complaint, should be thoroughly checked for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wiring connections or physical damage to the wiring hamess.

Refer to Intermittents. - Intermittent Malfunctions