Lotus 2004 Eleven Service Notes page 157

Lotus Service Notes Section EMP
Coolant Thermostat P0128
P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
Description
The thermostat diagnostic is enabled after each cold engine start, and monitors the rate of temperature rise
during warm up relative to the measured engine air flow.
Monitor: Continuous
Enable Criteria:
• Engine running
• Coolant Temperature > -10°C (14°F)
• Coolant Temperature < 70°C (158°F)
Disable Criteria:
P116, P117, P118 – Engine Coolant Temperature sensor faults
Potential failure modes:
Thermostat failure
Notes:
The MIL will be illuminated if the fault is present for 2 consecutive trips.
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