Sidekick 2WD L4-1590cc 1.6L SOHC 0 TBI 8V (1992)
Engine Control Module: Description and Operation
Self-Diagnosis Function
When any of such troubles as listed below occurs in Electronic Fuel Injection system, ECM activates "CHECK ENGINE" light while engine is running
to warn the driver of occurrence of such trouble and stores the data on defective area (where trouble occurred) in its back-up memory. (The memory is
kept as it is even if the trouble was only temporary and disappeared immediately. And it is not erased unless the power to ECM is shut off for 20
seconds or longer.) ECM also indicated defective area in memory by means of flashing of "CHECK ENGINE" light at the time of inspection (i.e. when
diagnosis switch terminal is grounded and ignition switch is turned ON).
^ When ECM received a defect informing signal from any one of following sensors and circuits or no signal whatever
-
Oxygen sensor
-
ATS
-
Pressure sensor
-
WTS
-
TPS
-
VSS
-
Idle switch
-
CAS
-
5th switch (Not for California Spec. model)
-
Ignition circuit
-
Ground circuit (California Spec. model only)
^ When a trouble exists in EGR system (or recirculated exhaust gas temperature sensor is defective) . . . For California Spec. model only
^ When CPU (Central Processing Unit) of ECM fails to operate
NOTE: Even when a trouble occurs in CAS, 5th switch circuit or idle switch circuit (circuit open), ECM does not indicate it (or activate "CHECK
ENGINE" light) while engine is running. And when that troubled circuit regains good condition, the memory of defective area will be erased
automatically even if the power circuit to ECM is not opened as described above.
Only ignition circuit trouble (code No. 41 among the above areas is not stored in back-up memory of ECM. (In other words, even if ECM has detected
a trouble in ignition circuit, once ignition switch is turned OFF, code No. 41 will not be indicated even when diagnosis switch terminal is grounded and
ignition switch is turned ON.).
Therefore, to check diagnostic code when engine fails to start, crank engine and then ground diagnosis switch terminal with ignition switch ON.
