| CAUTION | If ECM replacement is instructed in following testing, always ensure ECM harness connector and ground circuit are okay. If either are suspect, repair and repeat testing to confirm ECM malfunction. |
Circuit Description
Camshaft Position (CMP) sensors (G1 and G2 signals) and CKP sensor (NE signal) consist of a signal plate and a pick-up coil. CMP sensor signal plates have one tooth each on its outer circumference, and are mounted on left and right bank camshafts. When camshafts rotate, protrusion on signal plate and air gap on pick-up coil change, causing fluctuations in the magnetic field and generating an electromotive force in the pick-up coil.
CKP sensor signal plate has 12 teeth and is mounted on crankshaft. The ECM detects standard crankshaft angle based on G1, G2 signals, and actual crankshaft angle and engine speed based on NE signals.
DTC P0335 is set if no CKP sensor signal is received by ECM during cranking. DTC is also set in there is no CKP sensor signal to ECM during engine running. DTC P1335 is set if no CKP signal to ECM is received with engine speed at 1000 RPM or more. Possible causes are
- Open or short in CKP sensor circuit.
- CKP sensor.
- Starter.
- ECM.