Coolant Recirculation Pump - Lotus Evora Service Notes

Lotus Service Notes

Coolant Recirculation Pump

P2602 Coolant Pump Control Circuit Low
P2603 Coolant Pump Control Circuit High
Description
During a hot shutdown of the engine, the recirculation pump can continue to pump coolant around the engine.
The recirculation pump will run after the engine has been turned off if the enable criteria are matched.
The recirculation pump will also run after a short period of idle to aid heater performance.
Component connections
Connector Description
1 Recirc pump driver
2 Main relay via fuse R4
Monitor:
• Continuous
Enable Criteria:
• P2602 - continuous
• P2603 - engine running
Disable Criteria:
• None
Potential failure modes:
• P2602 – pump wiring open circuit or shorted to ground
• P2602 – fuse R4
• P2603 – pump circuit, ECM side, shorted to battery voltage
• Pump failure
• ECU output circuit failure
Diagnostic Mask:
• The service light will be illuminated for 30 seconds after engine start if the fault has been present for the
previous two trips.
Page 68
ECU Pin ECU Connector
M1 48 Way (Right)
- -
2009/02
Section EMR