P0340

Schematic:

CIRCUIT DESCRIPTION
The Camshaft Position (CMP) sensor indicates the camshaft position so the Powertrain Control Module (PCM) can determine which cylinder is misfiring when a misfire is present. With the engine running, the CMP activity counter will increment. Whenever the PCM receives an intermittent signal from the CMP, then the CMP resync counter will increment.

CONDITIONS FOR RUNNING THE DTC
Engine is running

CONDITIONS FOR SETTING THE DTC
No change in cam activity for 30 crankshaft revolutions.

ACTION TAKEN WHEN THE DTC SETS
^ The Malfunction Indicator Lamp (MIL) will illuminate after two consecutive ignition cycles in which the diagnostic runs with the malfunction present.
^ The PCM records the operating conditions at the time when the diagnostic fails. This information stores in the Freeze Frame and Failure Records buffers.
^ A history DTC stores.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The MIL will turn OFF after 3 consecutive ignition cycles in which the diagnostic runs without a fault.
^ A history DTC will clear after 40 consecutive warm up cycles without a fault.
^ The DTC can be cleared by using the scan tool.

DIAGNOSTIC AIDS
^ Thoroughly check all circuitry for proper mating, broken locks, improperly formed or damaged terminals, or physical damage to the wiring harness.
^ Whenever the PCM sees less than 15 resyncs in 256 seconds, the counter resets to 0. Anytime a poor connection is present, the cam sensor activity counter stops incrementing and the cam sensor resync counter starts to increment.
^ Inspect the wiring harness for damage. If the harness appears to be OK, observe the CMP resync counter on the scan tool while moving connectors and wiring harnesses related to the CMP sensor. If the CMP resync counter still does not count, then while still observing the scan tool, operate any non-engine related electrical components on the vehicle. A change in display will indicate the location of the malfunction.
^ A defective reluctor wheel or a cracked or damaged CMP sensor can result in an intermittent. Remove the camshaft sensor and inspect for any damage. With the CMP sensor removed you can also inspect the reluctor wheel through the hole. Check the porosity and condition of the wheel. The edges must be square, look for a nicked or damaged wheel.

An intermittent may be caused by any of the following conditions.
^ A poor connection
^ Rubbed through wire insulation
^ A broken wire inside the insulation

Thoroughly check any circuitry that is suspected of causing the intermittent complaint. Refer to Testing for Electrical Intermittents in Diagrams.

If a repair is necessary, refer to Wiring Repairs or Connector repairs in Diagrams.

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
6. The jumpers let the CMP sensor operate and the technician take readings with the DMM without damaging connector terminals. With a steady idle the DC Hz reading will be from 6.5 to 10.5 Hz.
8. If by disconnecting the jumper for the signal circuit and reading the sensor only gives a good reading, the signal circuit may be shorted to ground.