Specifications

74
Data Parameters Engine Parameters
AT SWITCH (AT POSITION SWITCH)
Range: ________________________________________________________P-N--/-R-DL
This parameter indicates the position of the gear selector lever and the signal of the park/neutral
position (PNP) switch. The display reads P-N-- when the selector is in park or neutral and reads
-R-DL when the selector is in reverse or any forward gear. The park/neutral switch is closed
(grounded) in park or neutral to allow starter motor engagement, and open in all other positions
to prevent starter operation.
BANK 1 CRANKSHAFT SEGM. 1 ADAPT
BANK 1 CRANKSHAFT SEGM. 2 ADAPT
BANK 1 CRANKSHAFT SEGM. 3 ADAPT
BANK 1 CRANKSHAFT SEGM. 4 ADAPT
BANK 1 CRANKSHAFT SEGM. 5 ADAPT
BANK 1 CRANKSHAFT SEGM. 6 ADAPT
BANK 2 CRANKSHAFT SEGM. 1 ADAPT
BANK 2 CRANKSHAFT SEGM. 2 ADAPT
BANK 2 CRANKSHAFT SEGM. 3 ADAPT
BANK 2 CRANKSHAFT SEGM. 4 ADAPT
BANK 2 CRANKSHAFT SEGM. 5 ADAPT
BANK 2 CRANKSHAFT SEGM. 6 ADAPT
Range: ______________________________________________________ not available
These parameters represent the crankshaft segment gear adaptation mean value and reflects
the addition of a supplementary correction factor designed to compensate for phase error in the
crankshaft sensor. This information is used to compute actual ignition timing. Each segment
represents the duration between each new ignition cycle. Ignition, injection, and engine speed
derived from segment duration are recalculated for each segment.
The engine is constantly monitored for misfire to protect the catalytic converter. The engine is
analyzed by evaluating the crankshaft position (CKP) sensor using a sophisticated mathematical
method to determine whether precise time synchronism exists between individual combustions.
Each individual combustion must produce a characteristic acceleration at the flywheel. If misfire
occurs, flywheel rotation slows slightly. These parameters are the amount of correction the ECM
is making to filter out vibration and prevent setting false misfire codes. The DME sets misfire
detection to a less sensitive setting when driving on a poor road surface. Normal engine running
values with no misfire and no correction factor read about 1.000.
The engine speed (RPM) and crankshaft position input signals are provided by the inductive
pulse sensor that scans the incremental gear wheel mounted on the flywheel of the engine. The
rotation of the gear wheel generates an AC voltage signal in the sensor as each tooth of the
wheel produces one pulse. The engine control module counts these pulses and determines
engine speed and crankshaft position.
The signal from the crankshaft sensor is also used for OBD-II monitoring for misfire detection.
BATTERY(V)
Range: _________________________________________________________ 0 to 25.5V
This parameter is an ECM-calculated value of battery voltage based on a sensing circuit across
the supply voltage circuit. Readings should be close to regulated charging system voltage with
the engine running, typically 13.5–14.5V at idle. Compare the displayed value to voltmeter
measurements taken across the battery terminals. The ECM uses this parameter primarily for
self-diagnostic purposes. However, the ECM may modify some functions if readings are too high
or too low.