Diagnostic Trouble Code Cancellation - Toyota 22R-E Service Manual

ENGINE – MFI SYSTEM
DIAGNOSTIC TROUBLE CODE
CANCELLATION
1. After repairing the trouble, the diagnostic trouble
code retained in memory by the ECM must be can–
celed out by removing the EFI fuse
(15A) for 30
seconds or more, depending on ambient temperature
(the lower the temperature, the longer the fuse must
be left out) with the ignition switch off.
HINT:
Cancellation can also be done by removing the
battery negative (–) terminal, but in this case
other memory systems (radio ETR, clock etc.) will
also be canceled out.
If the diagnostic trouble code is not canceled out,
it will be retained by the ECM and appear along
with a new code in the event of future trouble.
If it is necessary to work on engine components
requiring removal of the battery terminal, a check
must first be made to see if a diagnostic trouble
code has been recorded.
2. After cancellation, perform road test of the vehicle to
check that a normal code is now read on the mal–
function indicator lamp.
If the same diagnostic trouble code appears, it indi–
cates that the trouble area has not been repaired
thoroughly.
DIAGNOSIS INDICATION
1. When 2 or more codes are indicated, the lowest
number (code) will appear first.
2. All detected diagnostic trouble codes, except for code
No.51 and No.53 will be retained in memory by the
ECM from the time of detection until canceled out.
3. Once the malfunction is cleared, the malfunction in–
dicator lamp on the combination meter will go oft but
the diagnostic trouble code(s) remain stored in ECM
memory (except for code Nos.16, 43. 51 and 53).
EG2–175