Suzuki Liana RH413, Service Manual

Page: 117 / 1302

Engine General Information and Diagnosis: 1A-66
DTC P0171 / P0172: Fuel System Too Lean / Rich
S3RH0A1104035
Wiring Diagram
DTC Detecting Condition and Possible Cause
[a]
[b]
[f]
[e] [g]
[d]
[h]
[c]
1 2
5
1
2
2
3
5
4
+B
ECM
C41-9
C41-21
C41-8
C41-31
C41-1
BLU/YEL
BLU/WHT
BLU/RED
BLK/ORN
C41-3
BLK
BLU/GRN
WHT
ORN
C41-10
C41-13
1
I2RH0B110037-01
1. Injector [a]: Signal to decrease amount of fuel injection [f]: A/F mixture becomes leaner
2. HO2S-1 [b]: Signal to increase amount of fuel injection [g]: Oxygen concentration decreases
3. WU-TWC (Warm up-three way catalytic convector) [c]: High voltage [h]: Oxygen concentration increases
4. Sensed information [d]: Low voltage
5. ECM [e]: A/F mixture becomes richer
DTC detecting condition Possible cause
When one of the following conditions is met while engine
running under closed loop condition.
• Air/fuel ratio too lean
(Total fuel trim (short and long terms added) is more than
30%)
• Air/fuel ratio too rich
(Total fuel trim is less than – 30%)
*2 driving cycle detection logic, continuous monitoring
• Vacuum leaks (air drawn in)
• Exhaust gas leakage
• Heated oxygen sensor-1 circuit malfunction
• Fuel pressure out of specification
• Fuel injector malfunction (clogged or leakage)
• MAP sensor poor performance
• ECT sensor poor performance
• IAT sensor poor performance
• TP sensor poor performance
• EVAP control system malfunction
• PCV valve malfunction