Specifications

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Data Parameters Engine Parameters
CAN RECEPTION FROM LH1-SFI
CAN RECEPTION FROM LH2-SFI
Range: _______________________________________________________ OK/NOT OK
Used on EZ and LH systems. These parameters indicate whether the controller area network
(CAN) is receiving data from the fuel injection (LH 1-SFI or LH2-SFI) modules. The display
should read OK at all times. A NOT OK indicates a loss of communication between the modules.
CAN TRANSMISSION FROM DI1
CAN TRANSMISSION FROM DI2
Range: _______________________________________________________ OK/NOT OK
Used on EZ systems. These parameters indicate whether the controller area network (CAN) is
receiving a status transmission from the distributor ignition (DI1 and DI2) modules. The display
should read OK at all times. A NOT OK means the ignition module is not responding to the ECU.
CAN TRANSMISSION FROM LH1-SFI
CAN TRANSMISSION FROM LH2-SFI
Range: _______________________________________________________ OK/NOT OK
Used on LH systems. These parameters indicate whether the controller area network (CAN) is
receiving communication from the fuel injection (LH 1-SFI or LH 2-SFI) modules. The display
should read OK at all times. A NOT OK indicates a loss of communication between modules.
The CAN is a broadcast type of bus. This means that all modules “hear” all transmissions. There
is no way to send a message to just a specific module; all modules invariably pick up all traffic.
However, CAN hardware provides local filtering so each module reacts only to data whose
identifiers are stored in its acceptance list. This very high frequency transmission requires a
“twisted pair” of wires to address electromagnetic interference (EMI) concerns. Two wires also
ensure communication if one wire is damaged and provide the ability to recognize a CAN circuit
fault. The two lines must not be interchanged as each represents either high or low level.
CANISTER PURGE DUTY CYCLE
CANISTER PURGE VALVE DUTY CYCLE
Range: _________________________________________________________ 0 to 100%
Used on LH and SIM4 systems. This parameter indicates the duty cycle of the ECU-controlled
canister purge solenoid. The pulse width modulated solenoid is energized to activate purging
and switched off to prevent purging. A reading of 0% indicates purging is being prevented and a
reading of 100% indicates the solenoid is fully energized for maximum purging. When purge is
activated, duty cycle should gradually increase. This prevents rapidly dumping vapors into the
intake charge, which would momentarily create an overly rich mixture.
CATALYST SELECTED
Range: __________________________________________________________ YES/NO
Used on EZ systems. This parameter indicates whether the system configuration is designed to
operate with or without a catalytic converter. On U.S. models, the Scanner should display YES.
CATALYTIC CONVERTER HEATER
Range: __________________________________________________________ ON/OFF
Used on ME27 and ME28 systems. This parameter indicates whether the catalytic converter
heater is on or off.
CHARCOAL CANISTER
Range: __________________________________________________________ ON/OFF
Used on ME20 systems. This parameter shows the ECU control status for charcoal canister
purging. Purging is active when ON is displayed and prevented when OFF is displayed.