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ENGINE MANAGEMENT SYSTEM - V8 DESCRIPTION AND OPERATION 18-2-29 In the event of a TP sensor signal failure any of the following symptoms may be observed: l Engine performance concern. l Delayed throttle response. l Failure of emission control. l Closed loop idle speed control inoperative. l Automatic gearbox kickdown inoperative. l Incorrect altitude adaptation. l MIL illuminated (NAS only). There are three throttle position sensor diagnostic checks: l TP sensor signal is greater than the maximum threshold value – the engine speed must be greater than 400 rev/ l TP sensor signal is less than the minimum threshold – the engine speed must be greater than 400 rev/min for l Ratio of throttle position to mass of air flow – the calculated throttle angle must be outside limits when the engine ° C (14 ° F). Should a malfunction of the TP sensor occur the following fault codes may be evident and can be retrieved by P code J2012 description Land Rover description P0101 Mass or volume air flow circuit range/ Load monitoring, the ratio of throttle position to air flow P0122 TPS a circuit low input Signal < minimum threshold P0123 TPS a circuit high input Signal > maximum threshold |