Suzuki WagonR+ RB310 Service Manual page 663

6-2-92 ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE)
NOTE:
Check to make sure that the following conditions are satisfied when using this DTC CONFIRMATION
PROCEDURE.
• Intake air temp.: –7°C, 19.4°F or higher
• Engine coolant temp.: 70°C, 158°F or higher
• Altitude (barometric pressure): 2500 m, 8200 ft or less (540 mmHg, 72 kPa or more)
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start engine and warm up to normal operating temperature.
4) Drive vehicle at 40 mph (60 km/h) or higher. (engine speed: 2500 – 3000 r/min.)
5) Keep above vehicle speed for 6 min. or more. (Throttle valve opening is kept constant in this step.)
6) Release accelerator pedal and with engine brake applied, keep vehicle coasting (with fuel cut for 3 sec. or
more) and then stop vehicle.
7) Check DTC and pending DTC.
Troubleshooting
Step
1 Was "Engine and Emission Control System
Check" performed?
2 Is there DTC(s) other than HO2S–1?
3 Check HO2S–1 signal.
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
and take foot off from pedal to enrich and
enlean A/F mixture).
Does HO2S–1 output voltage deflect between
below 0.3 V and over 0.5 V repeatedly?
4 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 connector 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?
Action Yes
Go to Step 2.
Go to applicable DTC
diag. flow table.
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection" in Section 0A.
If they are OK, go to Step
8.
Go to Step 5.
No
Go to "Engine and Emis-
sion Control System
Check" in this section.
Go to Step 3.
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.