Specifications

82
Data Parameters Engine Parameters
quickly, while the LTFT moves slowly. The LTFT and STFT continue to work together until the
fuel mixture problem is corrected, or until the LTFT reaches its upper or lower limit. When the
LTFT reaches its limit, the ECM sets a DTC, and usually defaults into open-loop operation.
The factory term “Additive Mixture Adaptation” refers to the fact that the ECM is adding directly to
the injector opening time for all memory cells. However, data is only updated under certain idle
conditions. Be aware, IDLE FUEL TRIM works together with PART LOAD FUEL TRIM (page 87)
to establish the LTFT.
On V-type engines, IDL FTRIM1 refers to that cylinder bank that includes cylinder #1. On North
American models, cylinder #1 is on the passenger (right) side, or bank, of the vehicle. IDL
FTRIM2 refers to driver (left) side bank.
IDLE LOAD
Range: __________________________________________________________ YES/NO
IDLE SWITCH (IDLE LOAD SWITCH)
Range: _______________________________________________________CLSD/OPEN
These parameters indicate the position of the throttle position (TP) sensor. Usually, YES and
CLSD indicate the throttle plate is in the idle position. However, on some vehicles the opposite is
true. Confirm the definition of YES and CLSD by physically moving the throttle plate open and
closed and note which parameter variable the scan tool displays.
IGNITION ADVANCE(°)
Range: ______________________________________________________ not available
This ECM-commanded parameter indicates the current ignition timing advance in degrees of
crankshaft rotation.
INJECTION TIME BANK1(ms)
Range: ________________________________________________________ 0 to 20 ms
Injection Signal, Bank 1
INJECTION TIME BANK2(ms)
Range: ________________________________________________________ 0 to 20 ms
Injection Signal, Bank 2
INJECTION TIME PULSE(ms)
Range: ________________________________________________________ 0 to 20 ms
Injection Signal
These parameters display the amount of fuel injected into the engine. The BMW factory tool may
display complete on-time, which includes the injector opening delay time. The Snap-on
®
scan
tool injection time readings do not include delay time and therefore may display lower readings.
Early Motronic systems have a limited amount of hardware controllers available. When a test tool
is connected to these early systems, the controller that normally regulates the second bank of
fuel injectors is redirected to control the communications port. Therefore, an injection signal
parameter is available only for injector bank number 1.
When using this parameter for diagnosis, record how much the injector opening time changes
under different operating conditions rather than focusing on actual display values. Use the
oxygen sensor and fuel trim parameter values to establish a diagnostic base line.
INLET ADAPTATION(°)
Range: ______________________________________________________ not available
This parameter indicates the degree of the intake camshaft timing adaptation being made to
achieve optimal engine performance and to maintain low emission levels.