Dtc P0117 Or P0118 - Suzuki XL7 2007 Service Manual

1A-75 Engine General Information and Diagnosis:

DTC P0117 or P0118

Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle Diagnostic Information: " prior to using this diagnostic procedure.
• Review "Strategy Based Diagnosis: " for an overview of the diagnostic approach.
• "Diagnostic Procedure Instructions - Vehicle Diagnostic Information: " provides an overview of each diagnostic
category.
DTC Descriptors
DTC P0117: Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage
DTC P0118: Engine Coolant Temperature (ECT) Sensor Circuit High Voltage
Diagnostic Fault Information
Circuit
ECT Sensor Signal
Low Reference
Sensor or ECM damage may occur if the circuit is shorted to B+
1
Typical Scan Tool Data
ECT Sensor
Circuit
Operating Conditions: Engine operating in Closed Loop.
Parameter Normal Range:−39°C to 142°C (−38° to 288°F) Varies with coolant temperature.
ECT Sensor Signal
Low Reference
Internal ECM or ECT sensor damage may occur if the circuit is shorted to B+
1
Circuit Description
The engine coolant temperature (ECT) sensor is a
variable resistor that measures the temperature of the
engine coolant. The engine control module (ECM)
supplies 5 volts to the ECT signal circuit and supplies a
ground to the low reference circuit.
The following table illustrates the difference between
temperature, resistance, and voltage:
ECT ECT Resistance
Cold
Warm
Conditions for Running the DTC
P0117
• The engine is operating.
• The start up intake air temperature (IAT) is less than
72°C (161°F).
OR
• The start up intake air temperature (IAT) is greater
than 72°C (161°F).
• The engine run time is more than 59 seconds.
• The DTC runs continuously once the above conditions
are met.
P0118
• The ignition is ON or the engine is operating.
• The DTC runs continuously once the above condition
is met.
Short to
Ground
Short to Ground
143°C (289°F)
ECT Signal
Voltage
High High
Low Low
Open/High
Resistance
P0117 P0118, P0119
— P0118, P0119
−40°C (−40°F)
−40°C (−40°F)
—
Conditions for Setting the DTC
P0117
The ECM detects that the ECT is more than 140°C
(284°F) for more than 4 seconds or a cumulative of 50
seconds.
P0118
The ECM detects that the ECT is less than −42°C (−
43.6°F) for more than 4 seconds or a cumulative of 50
seconds. The scan tool is limited to −40°C (−40°F), so
the diagnostic procedure uses −39°C (−38°F) to
determine if there is an ECT condition.
Action Taken When the DTC Sets
DTC P0117 and P0118 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTC P0117 and P0118 are Type B DTCs.
Diagnostic Aids
• Test the ECT sensor at various temperature levels in
order to evaluate the possibility of a skewed sensor. A
skewed sensor can result in a DTC or a driveability
condition. Refer to "Temperature Versus Resistance -
Engine Coolant Temperature Sensor".
• If the vehicle has sat overnight, the IAT sensor and
the ECT sensor values should display within 3°C
(5°F).
Short to Voltage
Performance
P0118, P0119
1
P0118, P0119
1
Open Short to Voltage
−40°C (−40°F)
−40°C (−40°F)
Signal
P0116
P0116
1
1