Specifications

89
Data Parameters Engine Parameters
REQUIRED EXHAUST CAM(°)
REQUIRED EXHAUST CAM 1(°)
REQUIRED EXHAUST CAM 2(°)
Range: ______________________________________________________ not available
These parameters indicate the ECM-commanded (desired) exhaust camshaft position (CMP) on
Dual VANOS systems. The data changes according to engine speed and load.
On V-type engines, REQUIRED EXHAUST CAM 1 refers to the cylinder bank that includes
cylinder #1. On North American models, cylinder #1 is on the passenger (right) side, or bank, of
the vehicle. REQUIRED EXHAUST CAM 2 refers to the driver (left) side bank.
REQUIRED INLET CAMSHAFT(°)
Range: ______________________________________________________ not available
This parameter indicates the ECM-commanded (desired) intake camshaft position (CMP). The
data changes according to engine speed and load.
RPM
Range: ______________________________________________________ not available
This parameter indicates engine speed in revolutions per minute.
SECONDARY AIR PUMP
Range: __________________________________________________________ ON/OFF
This parameter indicates the ECM command to the secondary air (AIR) pump. Reads ON when
the ECM switches the pump on and reads OFF when the pump is off. Secondary air injection
reduces emissions at cold startup and during warmup by pumping air into the exhaust manifold.
The ECM normally activates this system for approximately two minutes following engine startup
and deactivates it after the engine operating temperature exceeds 104°F (40°C).
Most of the BMW secondary air injection systems consist of similar components. The control unit
controls the vacuum vent valve and the secondary air injection pump relay separately but
simultaneously. The AIR pump operates at a start temperature of 50–104°F (10–40°C). It
continues to operate for a maximum of two minutes at idle speed. Some systems contribute an
additional correction factor for secondary air “on” time with the additional input from the integral
ambient barometric pressure sensor. This sensor provides a base value to calculate the air mass
being injected into the exhaust system. This helps to “fine tune” the secondary air injection “on”
time, optimizing the necessary air flow into the exhaust system which reduces the time to
catalytic converter light-off.
SECONDARY AIR VALVE
Range: _______________________________________________________OPEN/CLSD
This parameter indicates the ECM command status of the non-return valve solenoid. The
non-return valve controls secondary air flow into the exhaust. Reads OPEN when the ECM is
commanding the solenoid to energize and open the valve.