6-2-96 ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE)
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
Refer to “DTC P0133 O2 Sensor (HO2S) Circuit Slow Response (Sensor–1)” in this section.
Troubleshooting
DTC Detecting Condition Trouble Area
Maximum HO2S voltage is lower than 0.45 V.
(2 driving cycle detection logic)
• HO2S–1
• HO2S–1 circuit
• Fuel system
• Exhaust gas leakage
• ECM
• Fuel shortage
Step Action Yes No
1Was “Engine and Emission Control System
Check” performed?
Go to Step 2. Go to “Engine and Emis-
sion Control System
Check” in this section.
2HO2S–1 output voltage check.
1) Connect scan tool to DLC with ignition
switch turned OFF.
2) Warm up engine to normal operating tem-
perature 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 0.5 V and below 0.3 V indicated?
Go to Step 4. Go to Step 3.
3Check HO2S–1 sensor ground.
1) Disconnect connector from HO2S–1 sen-
sor with ignition switch turned OFF.
2) Check for proper connection to HO2S–1
sensor at “YEL”, “RED”, “BLK/WHT” and
“BRN/WHT” wire terminals.
3) If wire and connection are OK, check there
is continuity between “BRN/WHT” wire ter-
minal of HO2S–1 sensor connector and
engine ground.
Is it continuity?
Go to Step 4. “BRN/WHT” wire open cir-
cuit.
Poor “E22-28” terminal
connection.
Faulty ECM ground.
If they are OK, substitute
a known-good ECM and
recheck.
4Check HO2S–1 sensor ground.
1) With ignition switch turn ON, check voltage
between “BRN/WHT” wire terminal of
HO2S–1 sensor connector and engine
ground.
Is voltage about 0.1 V or less?
Go to Step 5. “BRN/WHT” wire high
resistance circuit.
Poor “E22-28” terminal
connection.
Faulty ECM ground.
If they are OK, substitute
a known-good ECM and
recheck.
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