Part 2
On Board Diagnostic
P0117
Engine Temperature Open Circuit, Below Limit
Function
The temperature sensor measures the coolant temperature by means of a variable resistor.
The engine coolant temperature is required for regulating the warm-up phase, for mixture enrichment on start-up, for calculating the ignition angle in
the warm-up phase and for controlling the fans. In the event of a fault, a calculated substitute characteristic is used.
Diagnosis conditions
P0115
A temperature model is formed. If the measured temperature deviates too much from the calculated temperature, a fault is detected.
NOTE: A thermostat which is constantly open can cause the fault P0115.
P0117
A fault is recorded after a debounce time of 0.4 seconds if an engine temperature of less than 42 锟斤拷C is measured.
P0118
A fault is recorded after a debounce time of 0.4 seconds if an engine temperature of more than 140 锟斤拷C is measured.