General Precautions of EFI System Maintenance
F-23
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
P0118
P0118
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) The circuit connected to the Pin 39# 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
39# of ECU is normal.
24. P0121 Electronic Throttle Opening Sensor 1 Signal Irrational
Description about Malfunction Cause:
The system performs continuous monitoring over the signal circuit voltage of the throttle opening sensor, and
when the voltage exceeds the normal voltage range, it is determined to be the malfunction of signal irrational.
Malfunction Diagnostic Guide:
Required Equipment: (Diagnostic Instrument with EOBD Diagnostic Function)
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
P0121
P0121
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) Throttle opening sensor 1 damaged;
2) Electronic throttle opening sensor 1 connected to
other circuit.
Maintenance tips:
The malfunction has not been finally confirmed.
Please wait for system to fulfill diagnosis.。
25. P0122 Signal Circuit Voltage of Electronic Throttle Opening Sensor Too Low
(Malfunction of Circuit Short to Ground)
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 ground, it is determined to be the
malfunction of short to ground.
Schematic Circuit:
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