Specifications

Data Parameters Engine Parameters

check is to add both readings (R1 and R2) together at various throttle positions. They should add

up to the same value, usually between 4.5 to 4.9 volts.

LEAN/RICH RESPONSE TIME

Range: _______________________________________________________ 0 to 200 ms

Used on DM2 systems. This parameter is the lean to rich response time, or rise time, of the

oxygen sensor (O2S) in milliseconds (ms). The display reflects quality of the O2S feedback

signal to the ECU, and how well the ECU is correcting for changes in the air-fuel mixture. In

general, the lower the reading, the faster the ECU is responding.

LEARN VALUE THROTTLE VALVE STOP

Range: _________________________________________________________ 0 to 100%

Used on ME10 and ME20 systems. This parameter indicates the amount of ECU correction, or

the learned value, for throttle stop position as a percentage. Each time the throttle closes it must

return to a set tolerance of the previous voltage. If it varies more than the tolerance, the ECU

then learns a new closed throttle position. Typically, readings should be low. Higher readings

indicate the ECU is actively making adjustments to maintain the correct idle speed.

LEFT FRONT VSS

Range: ___________________________________________________ 0 to vehicle max

Used on HFM systems. This parameter indicates the input signal voltage provided to the ECU by

the left front wheel speed sensor. Display should increase and decrease in proportion to the

rotational speed of the wheel.

LEFT O2S (LAMBDA) CONTROL ACTIVE

Range: __________________________________________________________ YES/NO

Used on ME10 systems. This parameter indicates whether or not the system is operating in

closed loop and the ECU is responding to the left bank oxygen sensor (O2S) feedback signal.

The display reads YES when operating in closed loop, and NO when in open loop.

LEFT O2S (LAMBDA) CONTROL AUTHORIZED

Range: __________________________________________________________ YES/NO

Used on ME10 systems. This parameter indicates whether or not the ECU is allowing closed

loop operation. The display reads YES when closed loop operation is allowed, and NO when the

ECU is holding the system in open loop.

LEFT O2S (LAMBDA) CONTROL FAULT

Range: __________________________________________________________ YES/NO

Used on ME10 systems. This parameter indicates whether or not the ECU has recognized a

failure on the left oxygen sensor (O2S) circuit. The ECU prevents closed loop operation if a fault

is detected. The display normally reads NO, a reading of YES indicates a fault.

LEFT O2S (LAMBDA) CONTROL W/O O2S2

Range: ______________________________________________________ –25 to +25%)

Used on ME10 systems without a downstream O2S. This parameter represents the short-term

fuel metering correction based on the signal of the upstream O2S on the left cylinder bank.

Lambda control determines the injector duration required to maintain a 14.7:1, or 1.0 Lambda,

air-fuel ratio. Zero is the base setting, no correction. Positive readings indicate increased injector

duration to correct a lean condition, and negative readings indicate reduced on time to correct a

rich condition.