General Precautions of EFI System Maintenance
F-90
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
MI lamp On P-CODE Present MI lamp off P-CODE Present
P2123 P2123
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) Short circuit between Pin 16# of ECU and Pin
33#;
2) Circuit connected to Pin 16# of ECU shorted to
other power supply.
Maintenance tips:
The malfunction is not ultimately confirmed and it
may possibly be a random malfunction. Inspect the
following items:
1) Measure resistance between Pin 16# of ECU and
Pin 33#;
2) Measure resistance between Pin 16# of ECU and
other power supply.
120. P2127 Too Low Signal Voltage of Electronic Throttle Pedal Position Sensor 2
Description about Malfunction Cause:
After the start of engine, relevant control module inside ECU performs monitoring over circuit voltage of
electronic throttle pedal position sensor 2. When the voltage is below the lowest threshold value preset, it is
determined to be too low voltage malfunction.
Schematic Circuit:
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