SFI SYSTEM (w/o Electronic Throttle Control System), Diagnostic DTC:P0340

DTC Code DTC Name
P0340 Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor)

DESCRIPTION

The crankshaft position sensor system consists of a crankshaft position 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 magnet. The sensor plate rotates and as each tooth passes through the pickup coil, 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 speed. Using these calculations, the fuel injection time and ignition timing are controlled.

DTC No. DTC Detection Condition Trouble Area
P0340 Deviation in camshaft position sensor signal and crank position sensor signal (3 trip detection logic)

  • Mechanical system malfunction (jumped teeth of timing chain, chain stretched)

  • ECM

Tech Tips

DTC P0340 is detected when the engine cranks 12 revolutions or more.

WIRING DIAGRAM

A013656E01

INSPECTION PROCEDURE

Tech Tips


  • Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.

  • Troubleshoot DTCs P0341, P0342 and P0343 first. If no trouble is found, troubleshoot the following mechanical systems.

PROCEDURE


  1. CHECK VALVE TIMING


    1. Check the valve timing.

      OK
      The matchmarks of the crankshaft pulley and camshaft pulley align.

    NG

    REPAIR VALVE TIMING

    OK

    REPLACE ECM