Join Now
International Automotive Technicians Network

P1121 Diagnostic Trouble Code Discussion for September 2012

Electronic Throttle Control Actuator Malfunction


Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P1121
Help Request Posted
2004 Kia Rio 1.6L Poor Idle Quality, Hesitation, MIL Lamp on VIN: KNADC12504
P1121: Throttle Position Signal Circuit Malfunction. I'm getting some weird readings on my Genisys on this vehicle. MAF is reading 138.9 g/s at 125v-131v, however testing the MAF with a multimeter it tested .5v at idle and around 4.4 at about 3500rpm. We also tested the TPS with a multimeter and read fine as wel...
September 20, 2012
2004 Kia Rio 1.6L Poor Idle Quality, Hesitation, MIL Lamp on VIN: KNADC12504
P1121: Throttle Position Signal Circuit Malfunction. I'm getting some weird readings on my Genisys on this vehicle. MAF is reading 138.9 g/s at 125v-131v, however testing the MAF with a multimeter it tested .5v at idle and around 4.4 at about 3500rpm. We also tested the TPS with a multimeter and read fine as wel...
September 20, 2012