CS35 2013.04
3.1.13-133 3.1.13-133Electronic Control System - ME7
DTC P0117 and P0118
1. DTC Description
2. Possible Sources
3. Diagnosis Procedures
Warning: Refer to Warning and Notice (3.1.4 Cooling System, General Procedures).
CAUTION: Before the diagnostic procedure, observe the list of diagnostic data, analysis the
accuracy of the data for quick troubleshooting.
CAUTION: It is not recommended at any time of flammable coolant, such as alcohol. Flamma-
ble coolant can cause serious fire.
Fault code Description Definition
P0117
Engine coolant temperature
sensor voltage is too low
ECT sensor is a variable resistor with negative tem-
perature coefficient for measuring the engine cool-
ant temperature. ECM provides 5 V voltage to the
terminal 2 of the ECT sensor harness connector E22
through terminal 39 of ECM wiring harness connec-
tor E01, and get ECT signals from terminal 39 of
E01. Place terminal 1 of intake pressure tempera-
ture sensor E22 on low potential by terminal 17 of
E01.
P0118
Engine coolant temperature
sensor voltage too high
Fault
Code
Test Tactics
Setting Conditions (Control
Strategy)
Fault
P0117
Exceeding upper
limit, short circuit to
ground
Coolant temperature measured value is
higher than 138 ℃
• Sensor circuit fault
• Sensor fault
• ECM fault
P0118
Exceeding lower
limit, short circuit to
power supply or
open circuit
Coolant temperature measured value is
less than -38.25 ℃ .
Test Conditions Details/Results/Actions
1. General inspection
A. Inspect whether the engine water temperature
sensor is with the signs of corrosion, and whether
the coolant is leaking through the engine sensor.
B. Inspect if the level of the engine coolant in engine
cooling system stock tank is correct.
C. Inspect the sensor for loose or improper installation.
Is it normal?
Y
Go to step 2.
N
Repair the fault.
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