General Precautions of EFI System Maintenance
F-75
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
SVS lamp On P-CODE Present SVS lamp Off P-CODE Present
P0647 P0647
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) The circuit connected to Pin 69# of ECU and the
circuit of Pin 86# of air conditioning relay
connected to the main relay of power supply in
short circuit
2) The circuit connected to Pin 69# of ECU and the
circuit of Pin 30# of air conditioning relay
connected to the positive pole of battery in short
circuit
3) The circuit connected to Pin 69# of ECU and
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) Resistance of between circuit connected with
ECU Pin 69# and circuit between A/C relay Pin
86# and power supply main relay.
2) Resistance of circuit between ECU 69# and
positive battery pole.
3) Resistance of between circuit connected with
ECU Pin 69# and other power circuit.
95. P0650 Malfunction Indicator Lamp (MIL) Circuit Malfunction
Description about Malfunction Cause:
The voltage of malfunction indicator lamp circuit is to be measured by the control module for malfunction
indicator lamp circuit inside ECU, and when the voltage complies with the voltage in the mode of circuit
malfunction, it is determined to be a malfunction of malfunction indicator lamp circuit.
Schematic Circuit:
Ignition switch
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