Another S/C'd member worried about his AFR - Toyota Yaris Forums

kurokoma-kun · 04-06-2009, 08:48 PM

Well now you bastards have got me obsessing too! (not difficult)

Today I also saw one open loop status that fell outside what you all are describing as normal triggering conditions (DFCO and WOT)... it was under boost and acceleration at 32 TPS and 15 ign timing, and persisted for like 10 seconds... wtf.

Here's one random thought, though I don't know if it means anything at all. According to the wiring diagrams the s/c fuel controller does not wire into the throttle position sensor (TPS) located on the throttle body itself (ECM terminal VTA1) but rather into the accelerator pedal position sensor located on the pedal (VPA). Other than that it hooks up to RPM, ignition switch, injectors 1-4, and MAF (VG). The two other wires go to ground and activation switch.

Since the ECM uses the VTA1 data direct from the TPS to calculate everything from valve timing to long- and short-term fuel trims, I don't know what to think of that! I guess the fuel controller is altering the VPA signal sent to the TPS, and thereby manipulating the VTA1 signal then sent to the ECM?

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04-06-2009, 08:48 PM	#11
kurokoma-kun Drives: 2007 Yaris HB Join Date: Apr 2007 Location: my own little world Posts: 1,256	Well now you bastards have got me obsessing too! (not difficult) Today I also saw one open loop status that fell outside what you all are describing as normal triggering conditions (DFCO and WOT)... it was under boost and acceleration at 32 TPS and 15 ign timing, and persisted for like 10 seconds... wtf. Here's one random thought, though I don't know if it means anything at all. According to the wiring diagrams the s/c fuel controller does not wire into the throttle position sensor (TPS) located on the throttle body itself (ECM terminal VTA1) but rather into the accelerator pedal position sensor located on the pedal (VPA). Other than that it hooks up to RPM, ignition switch, injectors 1-4, and MAF (VG). The two other wires go to ground and activation switch. Since the ECM uses the VTA1 data direct from the TPS to calculate everything from valve timing to long- and short-term fuel trims, I don't know what to think of that! I guess the fuel controller is altering the VPA signal sent to the TPS, and thereby manipulating the VTA1 signal then sent to the ECM?