General Precautions of EFI System Maintenance
F-25
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
P0123 P0123
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) The circuit between the Pin 54# and the Pin 32#
of ECU in short circuit
2) The Pin 54# 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) The electric resistance between the Pin 54# and
the Pin 32# of ECU
2) The voltage for the Pin 54# of ECU
27. P0130 Upstream Oxygen Sensor Signal Irrational
Description about Malfunction Cause:
When any of the following cases arises with the signal of upstream oxygen sensor, the system will determine
the signal of upstream oxygen sensor to be irrational:
i. The signal of upstream oxygen sensor is maintained in a relatively low voltage range (0.1~0.4V) for a
long time.
ii. The signal of upstream oxygen sensor is maintained in a relatively high voltage range (0.6~1.5V), but the
signal of downstream oxygen sensor is always below 0.1V.
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
P0130 P0130
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) Upstream oxygen sensor damaged and
replacement required
Maintenance tips:
The malfunction has not been finally confirmed; wait
for ECU to fulfill the final test.
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