General Precautions of EFI System Maintenance
F-16
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
P0038 P0038
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) The circuit connected to the Pin 29# of ECU and
the circuit of Pin C# for downstream oxygen
sensor in short circuit
2) The circuit connected to the Pin 29# 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
29# of ECU is normal.
2) Measure the electric resistance of the circuit
between the Pin 28# of ECU and the Pin C# of
downstream oxygen sensor.
15. P0053 Upstream Oxygen Sensor Heating Internal Resistance Irrational
Description about Malfunction Cause:
Heater of oxygen sensor is diagnosed through monitoring over the internal resistance of heater. The internal
resistance of heater is determined by temperature of ceramic, while the temperature of ceramic is subjected to
the impact of waste gas temperature in the heater and the catalyst converter. The diagnosis is performed
through comparison between the measurement value and the reference value (related to heater power and the
temperature in catalyst converter) for the internal resistance of ceramic. It will be determined to be heating
malfunction if the measurement value exceeds the reference value or malfunction exists with the heater at
power level.
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
P0053
P0053
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) The heating function of downstream oxygen
sensor failed, and the oxygen sensor to be
replaced.
2) Check for proper connection of wire harness.
Maintenance tips:
The malfunction has not been finally confirmed.
Please wait for system to fulfill diagnosis.。
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