Throttle Actuator Control Range/Performance - Lotus Evora Service Notes

Lotus Service Notes Section EMR

Throttle Actuator Control Range/Performance

P0638 Throttle actuator control range/performance
Description
The single throttle butterfly valve mounted at the inlet to the intake plenum is operated by a stepper motor under
the command of the engine ECU. The valve moves through a range of nearly 90° and should display 100% at
full throttle and around 2% at idle.
Monitor:
• Continuous
Enable Criteria 1:
• Engine running
Disable Criteria 1:
• Electronic throttle fault P2135, P0122, P0122, P0222 or P0223 present
• Throttle demand transient condition
Malfunction Criteria 1:
• TPS error > 3% for 7.5 secs
Enable Criteria 2:
• Ignition on
Disable Criteria 2:
• Electronic throttle fault P2135, P0122, P0122, P0222 or P0223 present
Malfunction Criteria 2:
• Throttle not able to find closed position during boot
Potential failure modes:
• Blocked throttle body
• Damage to throttle actuator
Diagnostic Mask:
• The MIL will be illuminated if fault is present.
Notes: A mechanically sprung 7% throttle opening may be imposed.
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2009/02