CS35 2013.04
3.1.13-111 3.1.13-111Electronic Control System - ME7
DTC P0030, P0031, P0032, P0053
1. DTC Description
2. Possible Sources
3. Diagnosis Procedures
Fault Code Description Definition
P0030
Upstream oxygen sensor heating
control circuit fault
The working voltage of pre - catalytic oxygen sensor
heating coil is provided by the main relay that controlled
by ECM ,when the ignition switch is turned to "ON" state,
the terminal 4 of oxygen sensor connector E05 is with
battery voltage. ECM controls the working time of the
heater by the terminal 26 of ECM wiring harness connec-
tor E01.
P0031
Upstream oxygen sensor heating
control circuit voltage too low
P0032
Upstream oxygen sensor heating
control circuit voltage too high
P0053
Upstream oxygen sensor heating
internal resistance unreasonable
Fault Code Test Tactics
Setting Conditions
(Control Strategy)
Fault
P0030
Hardware circuit
inspect
• Open circuit
• Short circuit to ground
• Short circuit to power supply
• Sensor circuit fault
• Sensor fault
•ECM fault
P0031
P0032
P0053
Present resistance
value is higher than the
set value
• Exhaust temperature is within
normal range.
• When the exhaust tempera-
ture is between 250 ℃ ~ 550
℃ (1,022 ºF).
• Pre - catalytic oxygen sensor
internal resistance value is
higher than 1,600 Ω.
Test Conditions Details/Results/Actions
1. General inspection
A. Inspect pre - catalytic oxygen sensor wiring harness
connector for damage, poor contact, aging and
loose.
Is it normal?
Y
Go to step 2.
N
Repair the fault.
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