For overall description of the camshaft position sensor refer to
Exhaust Camshaft Position Actuator Description
.
The camshaft position actuator will only phase 25-cam degrees retard
(counterclockwise). Full advance (clockwise) is 0 degrees. The arrow on the
actuator shows advance direction.
The camshaft position actuator should always be serviced/replaced in the full
advanced position (full clockwise or 0 degrees). New replacement (service)
camshaft position actuators are shipped at full advance or 0 degrees. To be
sure the camshaft position actuator is performing properly, perform the following
to help in the diagnostics.
- Use a 25 mm (1 in) wrench on the hex of the exhaust camshaft
to rotate the exhaust camshaft and camshaft position actuator back and forth (clockwise
and counterclockwise) to purge the oil out of the camshaft position actuator.
- To perform an on-vehicle test, scribe or
draw a line (1) on the camshaft position actuator, flush with the head, in
the full advanced position. See arrow on the camshaft position actuator. With the
engine at TDC on #1 cylinder, the wording should be level.
- Use a 25 mm (1 in) wrench on the hex of the exhaust camshaft
to rotate the camshaft and camshaft position actuator counterclockwise to full retard.
- Scribe or draw a line (2) on the
camshaft position actuator at that position.
- Measure the distance between the two lines. The measurement (3) should
be 14-15 mm (0.55-0.59 in). If the measurement is far more
or far less, the camshaft position actuator needs to be replaced.