Suzuki Swift User Manual page 114

INSPECTION
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
2 Check HO2S-2 Heater and Its Circuit.
1) Warm up engine to normal operating temperature.
2) Stop engine.
3) Turn ignition switch ON and check voltage at
terminal C02-19 See Fig. 1. Voltage should be
over 10 V.
4) Start engine, run it at idle and check voltage at the
same terminal after 1 min. from engine start.
Voltage should be below 1.9 V.
Are check result as specified?
3 Check Heater or Sensor-2.
1) Disconnect HO2S-2 coupler with ignition switch
OFF.
2) Check for proper connection to HO2S-2 at "B/W"
and "Lg/B" wire terminals.
3) If OK, then check heater resistance.
Is it 11.7 – 14.3 Ω at 20_C, 68_F?
Fig. 1 for Step 2
ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10) 6-63
ACTION YES
Go to Step 2.
Intermittent trouble.
Check for intermittent
referring to
"Intermittent and
Poor Connection"
in Section 0A.
"Lg/B" wire open or
shorted to ground or
poor connection at
C02-19. If wire and
connection are OK,
substitute a known-
good ECM (PCM)
and recheck.
NO
Go to "ENGINE DIAG.
FLOW TABLE".
Go to Step 3.
Replace HO2S-2.