General Precautions of EFI System Maintenance
F-61
Malfunction Diagnostic Guide:
Required Equipment: (Diagnostic Instrument with EOBD Diagnostic Function, Digital Multimeter, and
Correct Circuit Diagram)
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
P0459
P0459
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) The circuit connected to the Pin 46# of ECU and
the circuit for the Pin 1# of carbon canister
control valve in short circuit
2) The circuit connected to the Pin 46# of ECU and
the other power supply circuit in short circuit
Maintenance tips:
The malfunction is not ultimately confirmed and it
may possibly be a random malfunction. Inspect the
following items:
1) Measure whether or not the voltage for the Pin
46# of ECU is normal.
2) Measure the electric resistance of the circuit
between the Pin 46# of ECU and the Pin 1# of
carbon canister control valve.
76. P0480 Control Circuit of Cooling Fan Relay is Open (Low Speed)
Description about Malfunction Cause:
After engine has been started, circuit voltage of cooling fan is to be measured by circuit control module of
ECU, and when the voltage complies with the voltage in the mode of open circuit, it is determined to be open
circuit of cooling fan.
Schematic Circuit:
Battery
Main relay
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