Toyota Corolla (E120) 2002–2008 Repair Manual / Diagnostics / Sfi system / Fuel pump control circuit / Circuit description
Toyota Corolla (E120): Circuit description
In the diagram below, when the engine is cranked, current flows from terminal st2 of the ignition switch to the starter relay coil and also current flows to terminal sta of the ecm (sta signal).
When the sta signal and ne signal are input to the ecm, tr is turned on, current flows to the coil of the circuit opening relay, the relay switches on, power is supplied to the fuel pump and the fuel pump operates.
While the ne signal is generated (engine running), the ecm keeps tr on (circuit opening relay on) and the fuel pump also keeps operating.
Wiring diagram
Other materials:
Description
When troubleshooting obd ii vehicles, the only difference
from the usual troubleshooting procedure is that you
need to connect the vehicle to the obd ii scan tool complying
with sae j1978 or the hand–held tester, and read
various data output from the vehicle’s ecm.
Obd ii regulation ...
Overhaul
Hint:
installation is in the reveres order of the removal. But the
installation is indicated only when it has a
point.
In the rh side, work in the same procedure as in the lh side.
1. Remove rear armrest assy lh
Using a screwdriver, remove the rear armrest.
Hint:
tape the s ...
Oil filter sub–assy
Replacement
Caution:
prolonged and repeated contact with mineral oil will result in the
removal of natural fats from
the skin, leading to dryness, irritation and dermatitis. In addition, used
engine oil contains potentially
harmful contaminants which may cause skin cancer.
Exercise ...