Suzuki 2000 Grand Vitara SQ625 Service Manual page 63

DTC P0134 HO2S-1 NO ACTIVITY DETECTED
WIRING DIAGRAM
Refer to page (DTC P0130).
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITION
Following conditions are detected in vehicle running
state while running under driving conditions described
for DTC CONFIRMATION PROCEDURE.
Output voltage of HO2S-1 does not exceed 0.45 V for
specified time.
(2 driving cycles detection logic)
DTC CONFIRMATION PROCEDURE
Refer to page (DTC P0130).
TROUBLESHOOTING
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
2 HO2S-1 Output Voltage Check:
1) Connect scan tool to DLC with ignition switch OFF.
2) Warm up engine to normal operating temperature
and keep it at 2000 r/min. for 60 sec.
3) Repeat racing engine (Repeat depressing accelerator
pedal 5 to 6 times continuously to enrich A/F mixture
and take foot off from pedal to enlean) and check
HO2S output voltage displayed on scan tool.
Is over 0.6 V and below 0.3 V indicated?
3 HO2S-1 Check:
1) With ignition switch OFF, disconnect HO2S-1
connector.
2) Check for proper connection to HO2S-1 at each
terminal.
3) If OK, connect voltmeter "1" and "2" terminal of
HO2S-1 connector.
4) Start engine and check voltmeter while repeating
racing engine.
Is over 0.6 V and below 0.3 V indicated?
4 Short Term Fuel Trim Check:
1) Run engine at 2000 r/min. for 60 sec.
2) With engine idling, check short term fuel trim
displayed on scan tool.
Is it within –20 to +20%?
ACTION
ENGINE DIAGNOSIS (G16 / J20 ENGINES) 6-59
TROUBLE AREA
D HO2S-1 or its circuit
D Fuel system
D ECM (PCM)
YES
Go to Step 2.
Go to Step 4.
"R" or "Gr/Y" circuit
open or short.
If wire and connec-
tions are OK, substi-
tute a known-good
ECM (PCM) and
recheck.
Intermittent trouble
or faulty ECM (PCM).
Check for intermit-
tent referring to
"Intermittent and
Poor Connection"
in Section 0A.
NO
Go to "ENGINE
DIAG. FLOW
TABLE".
Go to Step 3.
Replace HO2S-1.
Go to DTC P0171/
P0172 Diag. Flow
Table.