PLATE-BLOCK 4N4178 - Caterpillar

Programming Parameters
The Electronic Ignition System's control module (EIS control module) and the Electronic Control Module (ECM) have several parameters that can be programmed for the individual installation. The Digital Diagnostic Tool (DDT) or the Caterpillar Electronic Technician (Cat ET) is necessary for programming the parameters.The parameters are grouped into the following three menus on the DDT: "CUSTOMER SPECIFIED PARAMETERS (C.S.P.)", "TIMING" and "O2 TEST". Refer to Table 1 for the names of each parameter.
Table 1
Programmable Parameters for the Electronic Ignition System (EIS) and the Air/Fuel Ratio Control (AFRC)
DDT Cat ET
"C.S.P (CUSTOMER SPECIFIED PARAMETERS)"
AFRC "DES FULL LOAD 02" "Desired Oxygen at Full Load"
AFRC "GOV P-GAIN" "Governor Gain Factor"
AFRC "GOV STAB" "Governor Stability Factor"
AFRC "GOV COMP" "Governor Compensation Factor"
AFRC "AUX 1 GOV GAIN" "Auxiliary Proportional Governor Gain 1"
AFRC "AUX 1 GOV STAB" "Auxiliary Integral Governor Gain 1"
AFRC "AUX 1 GOV COMP" "Auxiliary Derivative Governor Gain 1"
AFRC "LOW IDLE SPEED" "Low Idle Speed"
AFRC "RATED SPEED" "Rated Engine Speed"
AFRC "SPEED RAMP RATE" "Engine Accel. Rate"
AFRC "SPEED DROOP" "Engine Speed Droop"
EIS "COMPRESSION" "Engine Compression Ratio"
EIS "DET SENSORS" "Number of Detonation Sensors"
EIS "SPEED SENSITIVE TIMING" "Rating Number"
EIS "LOAD TIMING MAP" "Engine Load Timing Map"
EIS "ENGINE TYPE" "Engine Configuration"
AFRC "APPLICATION" "Engine Operation Type"
AFRC "GOVERNOR" "Governor Type Setting"
"TIMING"
EIS "DES ENG TIMING" "Desired Engine Ignition Timing"
"O2/TEST"
AFRC "A/F RATIO P-GAIN" "Air/Fuel Proportional Gain"
AFRC "A/F RATIO I-GAIN" "Air/Fuel Integral Gain" If a module is replaced, the appropriate parameters must be copied from the old module. The settings can be recorded on paper and then programmed into the new module. Alternatively, this can be done with the "Copy Configuration" feature of the Caterpillar Electronic Technician (ET).
Changing the parameters during engine operation can cause the engine to operate erratically. This can cause engine damage.Unless you are otherwise instructed, only change the settings of the parameters when the engine is STOPPED.
"C.S.P. Customer Specified Parameters"
"DES FULL LOAD O2"
This parameter is the desired percent of exhaust oxygen when the engine is at 100 percent of rated load. The programmed value is assumed to be a dry oxygen reading. The oxygen sensor actually measures a wet reading. The software in the ECM is programmed in order to compensate for the difference.Entering a higher value of desired oxygen will cause the engine to run lean, with a higher air/fuel ratio. Leaner running causes these conditions: reduced exhaust emissions, lower exhaust temperatures, slightly increased fuel consumption and decreased power reserve.Entering a lower value of desired oxygen will cause the engine to run on a richer mixture, with a lower air/fuel ratio. Richer running causes these conditions: greater exhaust emissions, higher exhaust temperatures, lower fuel consumption and increased power reserve. If the air/fuel mixture is too rich, detonation can occur.Governor Gain Settings
The settings for the governor gains tailor the governor's response to the application. There are individual adjustments for the proportional gain, the stability, and the compensation. These settings are also called proportional gain, integral gain, and derivative gain.There are primary gains and alternate gains. Two sets of gains allow the engine's performance to be optimal under different