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P1121 Diagnostic Trouble Code Discussion for October 2012

Electronic Throttle Control Actuator Malfunction

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Trouble Ticket Help Requests for DTC P1121
Help Request Posted
2001 Ford F-150 Lariat 5.4L Surge, MIL Lamp on VIN: 1FTRX18L51
P1121: Tps inconsistent with maf. Hello all, we have a ford that does not register tp at times. The tp voltage will drop to 0 on the scanner. Trans upshifts but will not downshift. Pintest tps, 5v ref good, ground good, signal good, .8v to 4.3v sweeping the throttle. Pintest tps signal at ecm,...
October 22, 2012
2000 Ford Windstar SEL 3.8L Hesitation, Surge, Stall, Misfire, MIL Lamp on VIN: 2FMDA5345Y
P1121: TPS inconsistent with MAF. ... decel or at idle, found P1121. Tps tests good, original service information left me with the impression idle voltage was too high at 1.0v so it was replaced. ECM pinout chart gives a voltage range instead of just .53V, at 1.0V it's in range. The MAF voltag...
October 30, 2012