General Precautions of EFI System Maintenance
F-14
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
P0036 P0036
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 Pin D# of downstream oxygen
sensor in open circuit
2) The circuit for the Pin C# of downstream
oxygen sensor connected to the main relay in
open circuit
3) The Pin C# and the Pin D# of downstream
oxygen sensor in open circuit
Maintenance tips:
The malfunction is not ultimately confirmed and it may
possibly be a random malfunction. Inspect the following
items:
1) Measure the electric resistance of the line between
the Pin 29# for connector of ECU and the Pin D# of
downstream oxygen sensor.
2) Measure the electric resistance between the Pin C#
of downstream oxygen sensor connected to the main
relay.
3) Measure the electric resistance between the Pin C#
and the Pin D# of the downstream oxygen sensor.
4) Inspect whether or not the contact for the connector
of oxygen sensor and the connector of ECU is under
good condition.
13. P0037 Downstream Oxygen Sensor Heating Control Circuit Short to Ground
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
short to ground, it is determined to be the heating circuit of downstream oxygen sensor short to ground.
Schematic Circuit:
Malfunction Diagnostic Guide:
Main relay
To Next Page
Loading...
