General Precautions of EFI System Maintenance
F-70
Schematic Circuit:
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
P0627
P0627
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) The circuit connected to Pin 70# of ECU and the
Pin 85# of relay in open circuit
2) The Pin 86# of relay connected to the main relay
in open circuit
3) The electromagnetic coil between Pin 85# and
Pin 86# of relay in open circuit
Maintenance tips:
The malfunction is not ultimately confirmed and it
may possibly be a random malfunction. Inspect the
following items:
1) Measure the electric resistance of the line
between Pin 70# for connector of ECU and Pin
85# of relay.
2) The electric resistance for Pin 86# of relay to the
relay
3) The electric resistance between Pin 85# and Pin
86# of relay
90. P0628 Oil Pump Relay Control Circuit Short to Ground
Description about Malfunction Cause:
After engine has been started, the voltage of fuel pump relay circuit is to be measured by the circuit control
module inside ECU, and when the voltage complies with the voltage in the mode of short to ground, it is
determined to be fuel pump relay circuit short to ground.
Schematic Circuit:
Battery
Relay
Main relay
Fuel Pump
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