General Precautions of EFI System Maintenance
F-13
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
P0032 P0032
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) The circuit connected to the Pin 26# of ECU and
the circuit of the Pin D# for upstream oxygen
sensor in short circuit
2) The circuit connected to the Pin 26# 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
26# of ECU is normal.
2) Measure the electric resistance of the circuit
between the Pin 26# of ECU and the Pin D# of
upstream oxygen sensor.
12. P0036 Downstream Oxygen Sensor Heating Control Circuit Open
Description about Malfunction Cause:
After engine has been started, the voltage of heating circuit for downstream oxygen sensor is to be measured
by the circuit control module inside ECU, and when the voltage complies with the voltage in the mode of
open circuit, it is determined to be the heating circuit of downstream oxygen sensor in open circuit.
Schematic Circuit:
Main relay
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