Lotus 2004 ELISE Service Notes page 133

Lotus Service Notes
Engine Coolant Temperature
P0116 Engine Coolant Temperature Circuit Range/Performance
P0117 Engine Coolant Temperature Circuit Low
P0118 Engine Coolant Temperature Circuit High
Description
The engine coolant temperature sensor is a thermistor device which changes resistance with temperature. As
coolant temperature decreases the thermistor resistance value increases, and conversely as coolant tempera-
ture increases so the thermistor resistance value decreases.
Sensor connections
Sensor Connector
1
2
Sensor characteristics
0°C (32°F)
19.4°C (67°F)
42.5°C (108.5°F) = 1.249 V
80°C (176°F)
P0116
Enable Criteria:
Engine running > 800 seconds
Disable Criteria: None
Potential failure modes:
• P0117 – signal short circuit
• P0118 – signal open circuit
• Sensor failure
P0117
Enable Criteria: Engine running
Disable Criteria: None
Potential failure modes:
• Signal short circuit (Coolant Temperature = –40°C (–104°F) < 0.029 V)
• Sensor failure
P0118
Enable Criteria: Engine running
Disable Criteria: None
Potential failure modes:
• Signal open circuit (Coolant Temperature > 140°C (284°F) > 4.892 V)
• Sensor failure
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sn_emp_cyclone.indd 10
P0116
P0117
P0118
Description ECU Pin
Ground 7 (H1)
Signal 33 (C3)
= 3.279 V
= 2.186 V
= 0.469 V
ECU Connector
52 Way (Right) '06 M.Y. in brackets
52 Way (Right)
Section EMP
03/03/2006 11:03:35