Suzuki GA413, Service Manual

Page: 434 / 1246

6E-24 ENGINE AND EMISSION CONTROL SYSTEM
DTC NO.14 HEATED OXYGEN SENSOR CIRCUIT
(SIGNAL VOLTAGE LOW)
WIRING DIAGRAM
1. Heated oxygen sensor
2. Heated oxygen sensor connector
3. ECM connector (A)
4. ECM connector (B)
5. ECM
6. Power supply from main relay
TROUBLE SHOOTING
NOTE:
Before diagnosing trouble according to flow table given below, check to make sure that following system
and parts other than Electronic Fuel Injection system are in good condition.
– Air cleaner (clogged)
– Vacuum leaks (air inhaling)
– Spark plugs (contamination, gap)
– High-tension cords (crack, deterioration)
– Ignition timing
– Engine compression
– Any other system and parts which might affect A/F mixture or combustion.
If code No.14 and another code No. are indicated together, the latter has priority. Therefore, check and
correct what is represented by that code No. first and then proceed to the following check.
STEP ACTION YES NO
1 Did you perform “ENGINE DIAGNOSTIC FLOW
TABLE” in Section 6?
Go to Step 2. Go to“ENGINE DIAG-
NOSTIC FLOW TABLE”.
2 1) With ignition switch OFF position, install SUZU-
KI scan tool.
2) Start engine.
3) Run engine to normal operating temperature.
4) Maintain engine speed at 2000RPM for 60 se-
conds.
5) Using data list function of SUZUKI scan tool,
monitor oxygen sensor output voltage “02S”
with engine running at 2000RPM.
Does voltage switch below and above 0.55V?
Intermittent trouble.
If OK, substitute a
known-good ECM and
recheck.
Go to Step 3.