Suzuki WagonR+ RB310, Service Manual

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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
1 Was “ Engine and Emission Control System
Check ” performed?
Go to Step 2. Go to “ Engine and Emis-
sion Control System
Check
” in this section.
2 HO2S – 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.
3 Check 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.
4 Check 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.