CS35 2013.04
3.1.13-115 3.1.13-115Electronic Control System - ME7
DTC P0036, P0037, P0038, P0054
1. DTC Description
2. Possible Sources
3. Diagnosis Procedures
Fault Code Description Definition
P0036
Downstream oxygen sensor heat-
ing control circuit fault
The working voltage of post - 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 wiring harness connector
E08 is with battery voltage. ECM controls the working
time of the heater by the terminal 25 of ECM wiring har-
ness connector E01.
P0037
Downstream oxygen sensor heat-
ing control circuit voltage too low
P0038
Downstream oxygen sensor heat-
ing control circuit voltage too high
P0054
Downstream oxygen sensor heat-
ing internal resistance unreason-
able
Fault Code Test Tactics
Setting Conditions
(Control Strategy)
Fault
P0036
Hardware circuit inspect
• Open circuit
• Short circuit to ground
• Short circuit to power
• Sensor circuit fault
• Sensor fault
•ECM
P0037
P0038
P0054
Present resistance value
is higher than the set
value
• Exhaust temperature is within
normal range.
• The current temperature is
between 250 ℃ to 550 ℃
• Pre - catalytic oxygen sensor
internal resistance value is
higher than 2,200 Ω
Test Conditions Details/Results/Actions
1. General inspection
A. Inspect the post - 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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