Suzuki 2006 SX4, Service Manual

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1A-124 Engine General Information and Diagnosis:
DTC Troubleshooting
DTC P2227 / P2228 / P2229: Barometric Pressure Circuit Performance / Low / High
S6RW0C1104077
System Description
Barometric pressure sensor is installed in ECM.
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
DTC P2227 / P2228 / P2229
1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC and freeze frame data by using scan tool and warm up engine to normal
operating temperature.
3) Check DTC and pending DTC.
DTC Troubleshooting
Step Action Yes No
1 Was “Engine and Emission Control System Check”
performed? Go to Step 2. Go to “Engine and
Emission Control
System Check”.
2 DTC check
Is there any DTC(s)?
Go to applicable DTC. Go to Step 3.
3 A/F sensor circuit check
1) Disconnect connector from A/F sensor with ignition
switch turned OFF.
2) Check for proper terminal connection to A/F sensor
connector.
3) If connections are OK, check that A/F sensor circuit is as
follows.
• Wiring harness resistance of each “Signal (+) circuit of
A/F sensor” and “Signal (–) circuit of A/F sensor” is
less than 1
Ω
.
Is it in good condition?
Replace A/F sensor and
recheck. If this DTC is
detected again,
substitute a known-
good ECM. Repair or replace
defective wiring harness
/ connector.
DTC detecting condition Trouble area
DTC P2227:
Difference between barometric pressure value and estimated
barometric pressure (according engine load rate and engine
speed) is more than 25 kPa for 1.25 sec.
(2 driving cycle detection logic, monitoring once per driving cycle)
• Barometric pressure sensor in ECM
DTC P2228:
Output signal of barometric pressure sensor is higher than 4.7 V
for 0.5 sec.
(1 driving cycle detection logic)
DTC P2229:
Output signal of barometric pressure sensor is lower than 1.95 V
for 0.5 sec.
(1 driving cycle detection logic)
Step Action Yes No
1 Was “Engine and Emission Control System Check”
performed? Go to Step 2. Go to “Engine and
Emission Control
System Description”.
2 DTC check
Is there any DTC(s) other than P2227, P2228 and P2229?
Go to applicable DTC
diag. flow. Substitute a known
good ECM and recheck.