Specifications

51
Data Parameters Engine Parameters
ECT LH1
ENGINE COOLANT TEMP. 1
ECT LH2
ENGINE COOLANT TEMP. 2
Range: ________________________________________________________ 0 to 5.00 V
Used on DM and LH systems. These parameters display the voltage drop created by the
resistance of the engine coolant temperature (ECT) sensors. The ECT is a negative temperature
coefficient (NTC) sensor, so resistance decreases as temperature increases. The display should
read high voltage on a cold startup, then gradually drop as the engine warms up. The ECU uses
the ECT signal to regulate fuel injection for starting, after start enrichment, during warm-up
enrichment, acceleration enrichment, deceleration fuel shutoff; ignition timing at startup, warm-
up, closed throttle and deceleration shut-off; catalyst warm-up, charcoal canister purge, 2-3
upshift delay, camshaft adjustment, overheat protection and anti-knock control.
ECT OPERATING TEMPERATURE
ECT SENSOR
ECT VALUE RANGE
Range: __________________________________________________________ YES/NO
Used on DM and DM2 systems. These parameters indicate that the ECU self diagnostic tests for
the engine coolant sensors have run.
EFFECT.COOL.FAN OUTPUT DUTY CYCLE
Range: __________________________________________________________ 0 to 95%
Used on HFM systems. This parameter displays the effective output of the cooling fan. The
display shows the duty cycle of the cooling fan, which is controlled by the ECU.
EGR
EGR ACTIVATION
EGR LOGIC CHAIN
EGR VALVE
Range: __________________________________________________________ ON/OFF
Used on DM, LH and ME20 systems. These parameters indicate the state of the exhaust gas
recirculation (EGR) system. On LH systems, EGR is controlled by the LH module through the
EGR switch-over valve. On ME20 systems the ECU processes engine speed, air mass and
coolant temperature input signals to control EGR. The display reads ON when the ECU is
commanding recirculation and OFF when EGR is off. Approximately 10 to 15% of the exhaust
gas is recirculated. On LH systems, the ECU prevents EGR until the engine coolant temperature
reaches 149°F (65 °C). On ME20 systems, engine coolant temperature must reach 118°F (48
°C), and the closed throttle position switch must be open to allow EGR.
EGR LOGIC CHAIN
Range: __________________________________________________________ ON/OFF
Used on DM2 systems. This parameter indicates that the ECU on-board diagnostic tests for the
EGR system have run. Any problem would be reported as a diagnostic trouble code.
EGR
Range: __________________________________________________________ ON/OFF
EGR VALVE
Range: _________________________________________________________ 0 to 100%
Used on ERE/EVE/ASF (IFI Diesel)). In systems without a turbocharger, the ECU controls the
EGR vacuum transducer by applying a variable current. The EGR Valve parameter ia a
calculated value based on the applied current. The greater the percentage, the larger the EGR
valve opening.