Suzuki SX4 Service Manual page 112

Hide thumbs

Advertisement

Table of Contents
1A-62 Engine General Information and Diagnosis:
Step
1
Was "Engine and Emission Control System Check"
performed?
2
HO2S-2 heater power circuit check
1) Disconnect connector from HO2S-2 with ignition switch
turned OFF.
2) Check for proper connection to HO2S-2 at "BLK/WHT"
and "RED/BLU" wire terminals.
3) If wire and connection are OK, measure voltage
between "BLK/WHT" wire terminal of HO2S-2 connector
and engine ground with ignition switch turned ON.
Is voltage over 10 V?
3
HO2S-2 heater power circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between "BLK/WHT" wire terminal
of HO2S-2 connector and "E01-29" terminal wire of ECM
connector.
Is resistance below 5
4
HO2S-2 heater drive circuit check
1) Measure resistance between "RED/BLU" wire terminal of
HO2S-2 connector and vehicle body ground.
Is resistance infinity?
5
HO2S-2 heater drive circuit check
1) Turn ON ignition switch.
2) Measure voltage between "RED/BLU" wire terminal of
HO2S-2 connector and vehicle body ground.
Is voltage 0 V?
6
HO2S-2 heater drive circuit check
1) Connect connector to HO2S-2 with ignition switch turned
OFF.
2) Turn ON ignition switch.
3) Measure voltage between "C01-47" terminal of
disconnected ECM connector and vehicle body ground.
Is voltage over 10 V?
7
HO2S-2 heater check
1) Disconnect HO2S-2 connector with ignition switch
turned OFF.
2) Check HO2S-2 heater resistance referring to "Heated
Oxygen Sensor (HO2S-1 and HO2S-2) Heater On-
Vehicle Inspection (If Equipped) in Section 1C".
Is resistance within specified value?
8
HO2S-2 heater power circuit check
1) Connect connector to HO2S-2 with ignition switch turned
OFF.
2) Measure resistance between "E01-29" and "C01-47"
terminals of ECM connector.
Is resistance below 30
Action
?
?
Yes
Go to Step 2.
Go to Step 3.
Go to Step 4.
Go to Step 5.
Go to Step 6.
Go to Step 7.
Go to Step 8.
HO2S-2 heater circuit is
OK. Substitute a known-
good ECM and recheck.
No
Go to "Engine and
Emission Control
System Check".
"BLK/WHT" wire is open
circuit or shorted to
ground circuit.
"BLK/WHT" wire is high
resistance circuit.
"RED/BLU" wire is
shorted to ground
circuit.
"RED/BLU" wire is
shorted to power circuit.
"RED/BLU" wire is open
circuit.
Replace HO2S-2.
"RED/BLU" wire is high
resistance circuit.

Advertisement

Table of Contents
loading

  Also See for Suzuki SX4

Table of Contents