Toyota Corolla Cross: Ignition Coil And Spark Plug

 Starter Signal Circuit

DESCRIPTION The engine stop and start ECU uses its internal starter circuit to drive the starter drive relay (ST relay) and operate the starter. WIRING DIAGRAM CAUTION / NOTICE / HINT When the engine stop and start ECU is replaced, read the number of starter operations before replaceme

 Catalyst System Efficiency Below Threshold Bank 1 (P042000)

MONITOR DESCRIPTION The ECM uses air fuel ratio sensors mounted in front of and behind the Three-Way Catalytic Converter (TWC) to monitor its efficiency. The first sensor, the air fuel ratio sensor (sensor 1), sends pre-catalyst information to the ECM. The second sensor, the air fuel ratio sensor