Ford Transit 2002 Owner's Manual page 778

connector and wiring harness to the PCM need to be visually inspected for damage, chafing
or water ingress.
The temperature should rise to approximately 90ºC for a thermostat that has an 88ºC
value. The signal value will then fall as cooler coolant enters the engine.
If the ECT value fails to maintain a constant value and falls back to lower figures, typically
between 60ºC (140ºF) and 70ºC (150ºF), the thermostat and its sealing function within the
thermostat housing must be checked.
5. 5. INSTALL a new thermostat.
REFER to: Thermostat - 1.8L Duratec-DOHC (85kW/115PS) - Zetec
Cooling, Removal and Installation) /
Thermostat - 1.8L Duratorq-TDCi (Lynx) Diesel/1.8L Duratorq-TDDi (Lynx) Diesel
(303-03 Engine Cooling, Removal and Installation).
6. 6. Carry out another road test from step 1 using the same criteria to confirm that the
concern has been rectified.
7. 7. Using the WDS, clear the PCM keep alive memory (KAM) or electrically erasable
programmable read only memory (EEPROM) so that new drive values can be learnt.
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(303-03 Engine