Camshaft Position Control Interface (VANOS) Description

The Camshaft Position Control Interface consists (for each bank) of 1 PWM output drive to control the inlet camshaft position, and 1 PWM input signal for camshaft position feedback. See Fig 1 .

There is one diagnostic check of the Camshaft Position Signal, a fault is detected if:

1. If the signal does not change state (high to low or low to high voltage) every crankshaft revolution.

There are five diagnostic checks of the Variable Camshaft Timing, a fault is detected if:

1. The enabling conditions are satisfied and the PWM output drive voltage is less than 3 volts.
2. The enabling conditions are satisfied and the PWM output drive voltage is lees than 5 volts.
3. The enabling conditions are satisfied and the PWM output drive current is greater than 2.4 amps.
4. The alignment with the crank angle is less than 160° or greater than 185°.
5. The time taken to change timing is greater than 4-10 seconds (dependent upon the Engine Coolant Temperature).

Fig 1: Camshaft Position Control Interface (VANOS) & Enabling Conditions

Courtesy of LAND ROVER NORTH AMERICA, INC.