Lotus 2004 Eleven Service Notes page 151

Lotus Service Notes
Intake Air Temperature
P0111 Intake Air Temperature Sensor 1 Circuit Range/Performance
P0112 Intake Air Temperature Sensor 1 Circuit Low
P0113 Intake Air Temperature Sensor 1 Circuit High
Description
The combined sensor which measure both Mass Air Flow (MAF) and Intake Air Temperature (IAT) is incorpo-
rated into the airbox. The IAT sensor is a thermistor device which changes resistance with temperature. As
air intake temperature decreases the thermistor resistance value increases, and conversely as air temperature
increases so the thermistor resistance value decreases.
Sensor connections
Sensor Connector
1
2
3
4
5
Sensor characteristics
IAT -20°C (-4°F) 12.5 – 16.9 kΩ
IAT 20°C (68°F) 2.19 – 2.67 kΩ
IAT 60°C (140°F) 0.50 – 0.68 kΩ
Monitor: Continuous
P0111
Enable Criteria:
• Engine running < 30 secs
• Coolant temperature < 30°C (86°F)
Disable Criteria:
P0116, P0117, P0118 – Coolant temperature fault codes
Potential failure modes:
• P0112 – signal short circuit
• P0113 – signal open circuit
• Sensor failure
P0112
Enable Criteria: Engine running
Disable Criteria: None
Potential failure modes:
• Signal short circuit (IAT = –40°C (–104°F) < 0.049 V)
• Sensor failure
Page 8
P0111
P0112
P0113
Description ECU Pin
Battery Voltage -
MAF Ground 31 (D2)
MAF Signal 45 (B4)
IAT Signal 44 (B3)
IAT Ground 18 (D2)
ECU Connector
-
52 Way (Right)
52 Way (Right)
52 Way (Right)
52 Way (Right)
Section EMP
'06 M.Y. in brackets