Suzuki SY413 Service Manual page 2343

IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED) 8G-9
[INTERMITTENT TROUBLES]
<Vehicle not equipped with immobilizer indicator lamp>
D There are cases where output of diagnostic output terminal, mal-
function indicator lamp and/or Suzuki scan tool indicate a diag-
nostic trouble code representing a trouble which occurred only
temporarily and has gone. In such case, it may occur that good
parts are replaced unnecessarily. To prevent such accident, be
sure to follow instructions given below when checking by using
"Diagnostic Flow Table".
* When trouble can be identified, it is not an intermittent one:
Check coil antenna, ignition key, wires and each connection
and if they are all in good condition, substitute a known-good
ECM/PCM and recheck.
* When trouble can not be identified but output of diagnostic
output terminal, malfunction indicator lamp and/or Suzuki
scan tool indicate a trouble code:
Diagnose trouble by using that code No. and if ignition key,
coil antenna, wires and each connection are all in good condi-
tion, turn OFF ignition switch and then ON.
Then check what malfunction indicator lamp, output of diagnostic
output terminal and/or Suzuki scan too indicate.
Only when they indicate trouble code again, substitute a known-
good ECM/PCM or Immobilizer Control Module and check again.
If they indicate not trouble code but normal code, it means that an
intermittent trouble did occur and has gone. In this case, check
wires and connections carefully again.
<Vehicle equipped with immobilizer indicator lamp>
D There are cases where output of diagnostic output terminal and/
or Suzuki scan tool indicates a diagnostic trouble code repre-
senting a trouble which occurred only temporarily and has gone.
In such case, it may occur that good parts are replaced unneces-
sarily. To prevent such accident, be sure to follow instructions
given below when checking by using "Diagnostic Flow Table".
* When trouble can be identified, it is not an intermittent one:
Check coil antenna, ignition key, wires and each connection
and if they are all in good condition, substitute a known-good
ECM/PCM and recheck.
* When trouble can not be identified but output of diagnostic
output terminal and/or Suzuki scan tool indicates a trouble
code:
Diagnose trouble by using that code No. and if ignition key,
coil antenna, wires and each connection are all in good condi-
tion, turn OFF ignition switch and then ON.
Then check what Suzuki scan tool and/or output of diagnostic out-
put terminal indicates.
Only when they indicate trouble code again, substitute a known-
good ECM/PCM or Immobilizer Control Module and check again.
If they indicate not trouble code but normal code, it means that an
intermittent trouble did occur and has gone. In this case, check
wires and connections carefully again.