Operation CHARM: Car repair manuals for everyone.

Relay P11


For three seconds after starting, terminal 11 of the ECU is grounded, and a fixed pulse ratio of 92% is selected for an after start enrichment.
For 140 seconds after starting, the fuel shutoff function during decel is kept inoperative (non turbo vehicles only).
When the engine temperature is below 113°F (45°C), fuel boosting is available when the fuel booster pressure switch has been operated via the cold start valve, which is grounded via the thermostatic switch and the thermo-time switch. A grounding signal is available to terminal TKK in the relay.
When the engine is above 113°F (45°C), fuel boosting during acceleration is available for 140 seconds if the fuel booster pressure switch has operated. There will be no grounding signal to terminal TKK via the thermostatic switch and the thermo-time switch. Terminal TIP is energized, providing a ground signal to terminal 11 of the ECU, resulting in a pulse ratio of 92%.