General Precautions of EFI System Maintenance
F-58
Malfunction Diagnostic Guide:
Required Equipment: (Diagnostic Instrument with EOBD Diagnostic Function)
Step I: Use diagnostic instrument to read the malfunction information
Read Result I Read Result II
MIL Lamp On P-CODE Present MIL Lamp Off P-CODE Present
P0420 P0420
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
The three-way catalyst converter already failed, and
required to be replaced with new catalytic converter
Maintenance tips:
The malfunction has not been finally confirmed.
Please wait for system confirmation.
73. P0444 Carbon Canister Control Valve Control Circuit Open
Description about Malfunction Cause:
After engine has been started, the circuit voltage of the carbon canister control valve is to be measured by the
circuit control module inside ECU, and when the voltage complies with the voltage in the mode of open
circuit, it is determined to be the circuit of carbon canister control valve open.
Schematic Circuit:
Main relay
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