Specifications

75
Data Parameters Engine Parameters
SELECTED GEAR
Range: ______________________________________________________ P,R,N,1,2,3,4
Used on HFM, LH, ME10, and ME20 systems. This parameter indicates the gear selector lever
position. The display shows the selected range position, not the current gear that the
transmission is operating in.
SELECTOR LEVER POSITION
Range: ___________________________________________________________PN/RD1
Used on EGS, ERE/EVE/ASF (IFI Diesel)), HFM, LH, ME10, ME20, ME27, and ME28 systems.
This parameter indicates the gear selector lever position. The display shows the selected range
position, not the current gear that the transmission is operating in.
SELF-ADAPT THROTTLE VALVE-ACT
Range: __________________________________________________________ variable
Used on ME27 and ME28 systems. This parameter indicates the ECU adaptation in degrees for
the throttle valve actuator. This adaptation is made to compensate for wear, based on voltage
signal from the throttle valve actuator potentiometer.
SELF-ADAPTATION
Range: _____________________________________ ON/OFF or ENABLED/DISABLED
Used on HFM, ME27, ME28, and SIM4 systems. This parameter indicates whether or not the
ECU is attempting to compensate for tolerances in the mixture by means of long term adaptation,
or long term fuel trim (LTFT) adjustments. The display only reads ON or ENABLED when the
ECU is making LTFT adjustments.
SELF-ADAPTATION CTP (IDLE)
Range: _____________________________________________________ –1.0 to 1.0 ms
Used on LH and ME20 systems. This is the closed throttle (idle) fuel correction the ECU is
commanding to maintain a 14.7:1, or 1.0 Lambda, air-fuel ratio. The display is the adjustment in
addition to base injector time. There are three different ranges in which self-adaptation, or long-
term fuel trim (LTFT) is performed: closed throttle; lower part throttle, and upper part throttle. If
the short-term fuel trim (STFT) or O2S Lambda control constantly drifts out of mid-control range,
the ECU shifts the Lambda map to recreate a control factor of about zero. The millisecond
readout is added to or subtracted from the air mass inducted by the engine for determining
injector time. For example, base injector time is 3.0 ms and SELF-ADAPT CTP (IDLE) reads 0.3
ms. This means the ECU is using a computed value of 3.3 ms to determine injector duration.
SELF-ADAPTATION CTP (IDLE)
Range: _________________________________________________________ ±850 kg/h
Used on LH and HFM systems. This parameter displays the closed throttle position (CTP), or
idle, correction factor that the ECU is commanding. The displayed kg/h reading is added or
subtracted to the AIR MASS sensor value in order to determine injection time.
For example, the SELF-ADAPTATION CTP (IDLE) reading is 0.500 kg/h and the AIR MASS
sensor reading is 18 kg/h. The ECU will use a value of 18.5 kg/h to calculate the final injection
quantity, thus compensating for a lean mixture. Positive values are added to the AIR MASS
sensor reading and negative values are subtracted from the reading.
SELF-ADAPTATION DELAY TIME
Range: _____________________________________________________ –1.0 to 1.0 ms
Used on ME20 systems. This parameter is the adaptation for injector delay time, which is
supplementary injection duration based on battery voltage. Injector duration varies according to
battery voltage. There can be substantial time lag before the injector opens completely,
especially during cold starts or with a partially discharged battery. The display is the
supplementary injector time added to the base duration to compensate.