General Precautions of EFI System Maintenance
F-12
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
P0031 P0031
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) The circuit connected to the Pin 26# of ECU
short to ground
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 electric resistance for
the Pin 26# of ECU is normal.
11. P0032 Upstream Oxygen Sensor Heating Control Circuit Short to Power Supply
Description about Malfunction Cause:
After engine has been started, the voltage of upstream oxygen sensor heating circuit is to be measured by the
circuit control module inside ECU, and when the voltage complies with the voltage in the mode of short to
power supply, it is determined to be the heating circuit of upstream oxygen sensor short to power supply.
Schematic Circuit:
Main relay
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