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MONITOR DESCRIPTION The ECM uses the Throttle Position (TP) sensor to monitor the throttle valve opening angle. There are several A specific voltage difference is expected between the sensor terminals, VTA1 and VTA2, for each throttle valve opening angle. If the difference between VTA1 and VTA2 is incorrect, the ECM interprets this as a malfunction in the sensor, and stores a DTC. VTA1 and VTA2 each have a specific voltage range. If VTA1 or VTA2 is outside the normal operating range, the ECM interprets this as a malfunction in the sensor, and stores a DTC. If the malfunction is not repaired successfully, a DTC is stored 10 seconds after the engine is next started. P0121 This sensor transmits two signals: VTA1 and VTA2. VTA1 is used to detect the throttle opening angle and VTA2 is used to detect malfunctions in VTA1. The ECM performs several checks to confirm proper operation VTA1 and VTA2. If the output voltage difference between the two signals deviates from the normal If the malfunction is not repaired successfully, the DTC is stored 2 seconds after the engine is next started. MONITOR STRATEGY Related DTCs P0120: Throttle position sensor 1 range check (Fluctuating) P0121: TP sensor rationality P0122: Throttle position sensor 1 range check (Low voltage) P0123: Throttle position sensor 1 range check (High voltage) P0220: Throttle position sensor 2 range check (Fluctuating) P0222: Throttle position sensor 2 range check (Low voltage) P0223: Throttle position sensor 2 range check (High voltage) P2135: Throttle position sensor range check (Correlation) Required Sensors/Components (Main) Throttle position sensor Required Sensors/Components (Related) - Duration 2 seconds: P0120, P0121, P0122, P0123, P0220, P0222 and P0223 0.5 seconds: P2135 Case 1 0.4 seconds: P2135 Case 2 MIL Operation Immediate TYPICAL ENABLING CONDITIONS 1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0120-P0123,... |