Lotus Evora - Coolant Recirculation Pump

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Lotus Service Notes Section EMR
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 ECU Pin ECU Connector
1 Recirc pump driver M1 48 Way (Right)
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.
2009/02