Specifications

Data Parameters Engine Parameters

RIGHT 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), or Lambda control, circuit. The ECU prevents closed

loop operation if an O2S fault is detected. The display reads NO during normal operation, a

reading of YES indicates a fault is present.

RIGHT 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 right cylinder bank.

Zero is the base setting, no correction. Positive readings indicate the ECU is correcting for a lean

condition by increasing injector on time, while negative readings indicate the ECU is correcting

for a rich condition by reducing injector on time.

RIGHT WOT (FULL LOAD)/DECEL.SHUT-OFF

Range: __________________________________________________________ YES/NO

Used on ME10 systems. This parameter indicates if the ECU has shut off fuel delivery to the right

cylinder bank to reduce emissions during deceleration. The display should read YES on

deceleration following wide-open throttle (WOT), full load operation, and NO at all other times.

RON CORRECTION

Range: __________________________________________________________ variable

Used on HFM systems. This parameter indicates the ECU ignition timing adjustment for different

octane fuels. The research octane number (RON) represents the anti-knock quality of fuel. The

higher the RON, the greater the resistance to knocking. Depending on the system, ignition timing

may retard 4 to 6 degrees to compensate for the fuel being used.

RON INDEX

Range: __________________________________________________________ ON/OFF

Used on HFM systems. This is the value of the reference resistor used for determining the

internal fuel injection and ignition maps of the ECU. The research octane number (RON) is the

anti-knock quality of fuel at lower speeds. Motor Octane Number (MON) is the anti-knock quality

of fuel at higher speeds. U.S. government legislation simplified the issue requiring pumps to post

the minimum octane number determined by “Cost of Living Council” (CLC). The CLC number is

derived from both RON and MON. On this system the higher the RON, the greater the resistance

to knocking. Depending on the reference resistor, ignition timing may be retarded 4 to 6 degrees.

SAFETY CONTACT

SAFETY FUEL SHUT-OFF

Range: __________________________________________________________ ON/OFF

Used on ERE/EVE/ASF (IFI Diesel)), HFM, LH, ME10, ME20, ME27, and ME28 systems. These

parameters indicate the state of the safety contacts in the electronic accelerator actuator. The

display normally reads OFF and ON when the safety contacts are closed. The ECU is connected

to safety switch contacts in the electronic accelerator actuator or the cruise control/idle speed

control actuator. During normal operation, the switch sends a positive signal to the ECU. If the

throttle opens more than the position specified by the accelerator pedal and the cruise control is

not engaged, the switch sends a ground signal to the ECU. In response, the ECU switches the

fuel injectors off. Injection switches back on when engine speed drops below 1200 RPM.