General Precautions of EFI System Maintenance
F-24
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
P0122
P0122
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) The circuit between the Pin 54# and the Pin 78#
of ECU in short circuit
2) The Pin 54# of ECU and the ground in Short
Circuit
Maintenance tips:
The malfunction is not ultimately confirmed and it
may possibly be a random malfunction. Inspect the
following items:
1) The electric resistance between the Pin 54# and
the Pin 78# of ECU
2) The electric resistance between the Pin 54# of
ECU and the ground
26. P0123 Signal Circuit Voltage of Electronic Throttle Opening Sensor Too High
(Malfunction of Circuit Short to Power Supply)
Description about Malfunction Cause:
The system performs continuous monitoring over the signal circuit voltage of the throttle opening sensor, and
when the voltage complies with the voltage in the mode of short to power supply, it is determined to be the
malfunction of short to power supply.
Schematic Circuit:
5V Power supply
5V power supply
To Next Page
