ENGINE GENERAL INFORMATION AND DIAGNOSIS (G16/J20 ENGINES) 6-75
DTC P0134 HO2S-1 No Activity Detected
WIRING DIAGRAM
Refer to DTC P0130.
DTC DETECTING CONDITION AND TROUBLE AREA
DTC CONFIRMATION PROCEDURE
Refer to DTC P0130.
TROUBLESHOOTING
DTC DETECTING CONDITION TROUBLE AREA
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 speci-
fied time.
(2 driving cycles detection logic)
• HO2S-1 or its circuit
• Fuel system
• ECM (PCM)
Step Action Yes No
1Was “Engine Diag. Flow Table” performed? Go to Step 2. Go to “Engine Diag.
Flow Table”.
2 HO2S-1 Output Voltage Check :
1) Connect scan tool to DLC with ignition switch
OFF.
2) Warm up engine to normal operating tempera-
ture 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 dis-
played on scan tool.
Is over 0.6 V and below 0.3 V indicated?
Go to Step 4. Go to Step 3.
3HO2S-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 “GRY/YEL” wire termi-
nal and “RED” wire terminal of HO2S-1 con-
nector.
4) Start engine and check voltmeter while repeat-
ing racing engine.
Is over 0.6 V and below 0.3 V indicated?
“RED” or “GRY/YEL” cir-
cuit open or short.
If wire and connections
are OK, substitute a
known-good ECM (PCM)
and recheck.
Replace HO2S-1.
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%?
Intermittent trouble or
faulty ECM (PCM).
Check for intermittent
referring to “Intermittent
and Poor Connection” in
Section 0A.
Go to DTC P0171/
P0172 Diag. Flow
Ta b l e .
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