Toyota Corolla (E120) 2002–2008 Repair Manual / Diagnostics / Sfi system / Catalyst system efficiency below
threshold
Toyota Corolla (E120): Catalyst system efficiency below threshold
Dtc p0420 catalyst system efficiency below threshold (bank 1)
Other materials:
System description
The ecm uses signals from the vehicle speed sensor and crankshaft position
sensor to detect the actual
gear position (1st, 2nd, 3rd or o/d gear).
Then the ecm compares the actual gear with the shift schedule in the ecm memory
to detect the mechanical
trouble of the shift solenoid valves, th ...
On–vehicle inspection
1. Washer motor
Operation check
pour the water into the washer jar with the washer
motor and the pump installed to the washer jar assy.
Connect the battery (+) to terminal 2 of the washer
motor and the pump, the battery (–) to terminal 1 of
the washer motor and the pump ...
Overhaul
1. Remove cylinder block water drain cock sub–assy
Remove the cylinder block water drain cock from the cylinder
block.
2. Inspect connecting rod thrust clearance
Using a dial indicator, measure the thrust clearance while
moving the connecting rod back and forth.
Standard t ...