2006 SUZUKI SX4 heater

Downloaded from www.Manualslib.com manuals search engine 1A-92 Engine General Information and Diagnosis:
DTC P0131 / P0132: O2 Sensor (HO2S) Circuit Low Voltage / High Voltage (Sensor-1)S6RW0D1104031
Wiring Diagram
DTC Detecting Condition and Trouble Area
E01C01
3 4
18 19 5 6 7 10 11
17 20
47 46 49 50 51 21 22
5216 259
24 14
29
55 57 54 53 59
60 582
26 27 28 15
30
56 4832 31 34 35 36 37 40 42 39 38 44
45 43 41 331 12 13
238 3 4
18 19 5 6 7 10 11
17 20
47 46 49 50 51 21 22
5216 259
24 14
29
55 57 54 53 59
60 582
26 27 28 15
30
56 4832 31 34 35 36 37 40 42 39 38 44
45 43 41 331 12 13
238
BLK/WHT
WHT
11
GRN
39
E01-29
WHT
ORN
BLK/WHT
BLKC01-46
C01-10
C01-57
6
7
10
BLK
BLUWHT
BLK/RED
1
4
5
8
12
I6RW0D110027-01
1. Main fuse box 4. Junction block assembly 7. Heater 10. To HO2S-2
2. Shield wire 5. “IG COIL” fuse 8. To HO2S-2 heater 11. Individual circuit fuse box No.1
3. Ignition switch 6. HO2S-1 9. ECM 12. “IGN” fuse
DTC detecting condition Trouble area
DTC P0131:
Maximum HO2S voltage is lower than specified voltage.
(2 driving cycle detection logic, monitoring once/1 driving)
DTC P0132:
Minimum HO2S voltage is higher than specified voltage.
(2 driving cycle detection logic, monitoring once/1 driving)• HO2S-1 circuit
•HO2S-1
• Fuel system
•ECM
• Fuel shortage
• Exhaust system
• Air intake system

Downloaded from www.Manualslib.com manuals search engine 1A-94 Engine General Information and Diagnosis:
4HO2S-1 ground check
1) Disconnect connector from HO2S-1 with ignition switch
turned OFF.
2) Check for proper connection to HO2S-1 connector at
“BLK/RED”, “WHT”, “BLK/WHT” and “ORN” wire
terminals.
3) If connections are OK, measure resistance between
“ORN” wire terminal of HO2S-1 connector and engine
ground.
Is measured resistance less than 5
Ω?Go to Step 5. “ORN” wire is open or
high resistance circuit.
Poor “C01-57” terminal
connection. Faulty ECM
ground.
If they are OK,
substitute a known-
good ECM and recheck.
5Wire circuit check
1) Turn OFF ignition switch.
2) Remove ECM from its bracket with ECM connectors
connected.
3) Measure resistance between “WHT” wire terminal of
HO2S-1 connector and “C01-10” terminal of ECM
connector.
Is resistance less than 5
Ω?Go to Step 6. “WHT” wire is high
resistance circuit or
open circuit. Poor “C01-
10” terminal connection.
Faulty ECM ground. If
they are OK, substitute
a known-good ECM and
recheck.
6Wire circuit check
1) Disconnect connectors from ECM with ignition switch
turn OFF.
2) Measure resistance between “WHT” wire terminal of
HO2S-1 connector and vehicle body ground.
Is resistance infinity?Go to Step 7. “WHT” wire is shorted to
ground circuit.
7HO2S-1 signal circuit check
1) Measure voltage between “WHT” wire terminal of HO2S-
1 connector and vehicle body ground.
Is voltage 0 V?Go to Step 8. “WHT” wire is shorted to
other circuit.
8HO2S-1 heater circuit check
1) Check HO2S-1 heater circuit referring to “DTC P0031 /
P0032: HO2S Heater Control Circuit Low / High
(Sensor-1)”.
Is circuit in good condition?Go to Step 9. Repair HO2S-1 circuit.
9Exhaust system check
1) Check exhaust system for exhaust gas leakage.
Is it OK?Go to Step 4 in “DTC
P0171 / P0172: Fuel
System Too Lean /
Rich”.
If it is in good condition,
go to Step 10.Repair leakage of
exhaust system.
10Air intake system check
1) Check air intake system for clog or leak.
Is it OK?Replace HO2S-1
referring to “Heated
Oxygen Sensor (HO2S-
1 and HO2S-2)
Removal and
Installation (If Equipped)
in Section 1C”.
If DTC still exists,
substitute a known-
good ECM and recheck.Repair or replace air
intake system. Step Action Yes No

Downloaded from www.Manualslib.com manuals search engine Engine General Information and Diagnosis: 1A-97
2HO2S-1 output voltage check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Warm up engine to normal operating temperature 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 it) and check HO2S
output voltages displayed on scan tool.
Is over 0.6 V and below 0.3 V indicated?Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”. If check result is
OK, go to Step 3.Go to Step 3.
3HO2S-1 ground check
1) Disconnect connector from HO2S-1 with ignition switch
turned OFF.
2) Check for proper connection to HO2S-1 at “BLK/RED”,
“WHT”, “BLK/WHT” and “ORN” wire terminals.
3) If wire and connection are OK, measure resistance
between “ORN” wire terminal of HO2S-1 connector and
engine ground.
Is resistance less than 5
Ω?Go to Step 4. “ORN” wire is open or
high resistance circuit.
Poor “C01-57” terminal
connection. Faulty ECM
ground.
If they are OK,
substitute a known-
good ECM and recheck.
4Wire circuit check
1) Turn OFF ignition switch.
2) Remove ECM from its bracket with ECM connectors
connected.
3) Measure resistance between “WHT” wire terminal of
HO2S-1 connector and “C01-10” terminal of ECM
connector.
Is resistance less than 5
Ω?Go to Step 5. “WHT” wire is high
resistance circuit or
open circuit. Poor “C01-
10” terminal connection
of ECM connector.
Faulty ECM ground. If
they are OK, substitute
a known-good ECM and
recheck.
5Wire circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between “WHT” wire terminal of
HO2S-1 connector and vehicle body ground.
Is resistance infinity?Go to Step 6. “WHT” wire is shorted to
ground circuit.
6HO2S-1 heater circuit check
1) Check HO2S-1 heater circuit referring to “DTC P0031 /
P0032: HO2S Heater Control Circuit Low / High
(Sensor-1)”.
Is it in good condition?Go to Step 7. Repair HO2S-1 circuit.
7Exhaust system check
1) Check exhaust system for exhaust gas leakage.
Is it OK?Go to Step 4 in “DTC
P0171 / P0172: Fuel
System Too Lean /
Rich”.
If it is in good condition,
go to Step 8.Repair leakage of
exhaust system. Step Action Yes No

Downloaded from www.Manualslib.com manuals search engine 1A-98 Engine General Information and Diagnosis:
DTC P0137 / P0138: O2 Sensor (HO2S) Circuit Low Voltage / High Voltage (Sensor-2)S6RW0D1104034
Wiring Diagram
DTC Detecting Condition and Trouble Area8Air intake system check
1) Check air intake system for clog or leak.
Is it OK?Replace HO2S-1
referring to “Heated
Oxygen Sensor (HO2S-
1 and HO2S-2)
Removal and
Installation (If Equipped)
in Section 1C”.
If DTC still exists,
substitute a known-
good ECM and recheck.Repair or replace air
intake system. Step Action Yes No
E01C01
3 4
18 19 5 6 7 10 11
17 20
47 46 49 50 51 21 22
5216 259
24 14
29
55 57 54 53 59
60 582
26 27 28 15
30
56 4832 31 34 35 36 37 40 42 39 38 44
45 43 41 331 12 13
238 3 4
18 19 5 6 7 10 11
17 20
47 46 49 50 51 21 22
5216 259
24 14
29
55 57 54 53 59
60 582
26 27 28 15
30
56 4832 31 34 35 36 37 40 42 39 38 44
45 43 41 331 12 13
238
BLK/WHT
WHT
11
GRN
39
E01-29
BRN
ORN
BLK/WHT
BLKC01-47
C01-11
C01-57
6
2 7
10
BLK
BLUWHT
RED/BLU
1
4
5
8
12
5V
I6RW0D110028-01
1. Main fuse box 4. Junction block assembly 7. Heater 10. To HO2S-1
2. Shield wire 5. “IG COIL” fuse 8. To HO2S-1 heater 11. Individual circuit fuse box No.1
3. Ignition switch 6. HO2S-2 9. ECM 12. “IG ACC” fuse
DTC detecting condition Trouble area
DTC P0137:
HO2S-2 voltage is lower than specified value while engine is idling after driving with
high engine load (high speed) for specified time. And HO2S-2 max. voltage minus
HO2S-2 min. voltage is less than specified value for 40 sec.
(2 driving cycle detection logic)
DTC P0138:
HO2S-2 voltage is higher than specified value while engine is idling after driving with
high engine load (high speed) for specified time. And HO2S-2 max. voltage minus
HO2S-2 min. voltage is less than specified value for 40 sec.
(2 driving cycle detection logic)•HO2S-2
• HO2S-2 circuit
• Fuel system
•ECM
• Fuel shortage
• Exhaust system
• Air intake system

Downloaded from www.Manualslib.com manuals search engine 1A-100 Engine General Information and Diagnosis:
4HO2S-2 ground check
1) Disconnect connector from HO2S-2 with ignition switch
turned OFF.
2) Check for proper connection to HO2S-2 connector at
“RED/BLU”, “BRN”, “ORN” and “BLK/WHT” wire
terminals.
3) If connections are OK, measure resistance between
“ORN” wire terminal of HO2S-2 connector and engine
ground.
Is resistance less than 5
Ω?Go to Step 5. “ORN” wire is open or
high resistance circuit.
Poor “C01-57” terminal
connection. Faulty ECM
ground.
If they are OK,
substitute a known-
good ECM and recheck.
5Wire circuit check
1) Turn OFF ignition switch.
2) Remove ECM from its bracket with ECM connectors
connected.
3) Measure resistance between “BRN” wire terminal of
HO2S-2 connector and “C01-11” terminal of ECM
connector.
Is resistance less than 5
Ω?Go to Step 6. “BRN” wire is high
resistance circuit or
open circuit. Poor “C01-
11” terminal connection.
If they are OK,
substitute a known-
good ECM and recheck.
6Wire circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between “BRN” wire terminal of
HO2S-2 connector and vehicle body ground.
Is resistance infinity?Go to Step 7. “BRN” wire is shorted to
ground circuit.
7HO2S-2 signal circuit check
1) Measure voltage between “BRN” wire terminal of HO2S-
2 connector and vehicle body ground.
Is voltage 0 V?Go to Step 8. “BRN” wire is shorted to
other circuit.
8HO2S-2 heater circuit check
1) Check HO2S-2 heater circuit referring to “DTC P0037 /
P0038: HO2S Heater Control Circuit Low / High
(Sensor-2)”.
Is circuit in good condition?Go to Step 9. Repair HO2S-2 circuit.
9Exhaust system check
1) Check exhaust system for exhaust gas leakage.
Is it OK?Go to Step 4 in “DTC
P0171 / P0172: Fuel
System Too Lean /
Rich”.
If it is in good condition,
go to Step 10.Repair leakage of
exhaust system.
10Air intake system check
1) Check air intake system for clog or leak.
Is it OK?Replace HO2S-2
referring to “Heated
Oxygen Sensor (HO2S-
1 and HO2S-2)
Removal and
Installation (If Equipped)
in Section 1C”.
Is DTC still exists,
substitute a known-
good ECM and recheck.Repair or replace air
intake system. Step Action Yes No

Downloaded from www.Manualslib.com manuals search engine 1A-102 Engine General Information and Diagnosis:
3Wire circuit check
1) Turn OFF ignition switch.
2) Remove ECM from its bracket with ECM connectors
connected.
3) Measure resistance between “BRN” wire terminal of
HO2S-2 connector and “C01-11” terminal of ECM
connector.
Is resistance less than 5
Ω?Go to Step 4. “BRN” wire is high
resistance circuit or
open circuit. Poor “C01-
11” terminal connection.
If they are OK,
substitute a known-
good ECM and recheck.
4HO2S-2 signal circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure voltage between “BRN” wire terminal of HO2S-
2 connector and vehicle body ground.
Is voltage 0 V?Go to Step 5. “BRN” wire is shorted to
other circuit.
5HO2S-2 heater circuit check
1) Check HO2S-2 heater circuit referring to “DTC P0037 /
P0038: HO2S Heater Control Circuit Low / High
(Sensor-2)”.
Is circuit in good condition?Go to Step 6. Repair HO2S-2 circuit. If
circuit is OK, substitute
a known-good ECM and
recheck.
6Exhaust system check
1) Check exhaust system for exhaust gas leakage.
Is it OK?Go to Step 4 in “DTC
P0171 / P0172: Fuel
System Too Lean /
Rich”.
If it is in good condition,
go to Step 8.Repair leakage of
exhaust system.
7Air intake system check
1) Check air intake system for clog or leak.
Is it OK?Replace HO2S-2
referring to “Heated
Oxygen Sensor (HO2S-
1 and HO2S-2)
Removal and
Installation (If Equipped)
in Section 1C”.
If DTC still exists,
substitute a known-
good ECM and recheck.Repair or replace air
intake system. Step Action Yes No

Downloaded from www.Manualslib.com manuals search engine Engine General Information and Diagnosis: 1A-127
DTC Troubleshooting
WARNING!
In order to reduce risk of fire and personal injury, this work must be performed in a well ventilated area
and away from any open flames such as gas water heater.

NOTE
Before this troubleshooting is performed, read the precautions for DTC troubleshooting referring to
“Precautions for DTC Troubleshooting”.

Step Action Yes No
1Was “Engine and Emission Control System Check”
performed?Go to Step 2. Go to “Engine and
Emission Control
System Check”.
2EVAP canister purge power supply circuit check
1) Turn OFF ignition switch and disconnect connector from
EVAP canister purge valve.
2) Measure voltage between engine ground and “BLK/
RED” wire terminal of EVAP canister purge valve
connector with ignition switch turned ON.
Is it voltage 10 – 14 V?Go to Step 3. “BLK/RED” wire is open
circuit.
3Wire circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between “C01-29” terminal of ECM
connector and vehicle body ground.
Is resistance infinity?Go to Step 4. “BLU/BLK” wire is
shorted to ground
circuit.
4Wire circuit check
1) Measure voltage between “C01-29” terminal of ECM
connector and vehicle body ground with ignition switch
turned ON.
Is voltage 0 V?Go to Step 5. “BLU/BLK” wire is
shorted to other circuit.
5Wire circuit check
1) Connect connector to purge control valve with ignition
switch turned OFF.
2) Turn ON ignition switch and measure voltage between
“C01-29” terminal of ECM connector and vehicle body
ground.
Is it voltage 10 – 14 V?Go to Step 6. “BLU/BLK” wire is open
circuit.
6EVAP canister purge control valve check
1) Check EVAP canister purge control valve referring to
“EVAP Canister Purge Valve Inspection in Section 1B”.
Is it in good condition?Go to Step 7. Faulty EVAP canister
purge control valve.
7EVAP canister purge control circuit check
1) With ignition switch turn OFF, measure resistance
between “E01-1/16” terminal and “C01-29” terminal of
ECM connector.
Is resistance below 34
Ω at 20 °C, 68 °F?Faulty ECM. Substitute
a known-good ECM and
recheck.“BLK/RED” and/or
“BLU/BLK” wire are high
resistance circuit.

Downloaded from www.Manualslib.com manuals search engine 1A-132 Engine General Information and Diagnosis:
DTC Confirmation Procedure
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 engine to normal operating temperature.
4) Run engine at idle and turn both A/C switch and heater blower switch ON (turn ON air conditioning) for 3 min. or
more.
5) Check DTC and pending DTC.
DTC Troubleshooting
NOTE
Before this troubleshooting is performed, read the precautions for DTC troubleshooting referring to
“Precautions for DTC Troubleshooting”.

Step Action Yes No
1Was “Engine and Emission Control System Check”
performed?Go to Step 2. Go to “Engine and
Emission Control
System Check”.
2Check wire circuit
1) Disconnect A/C condenser cooling fan control relay (1)
from individual circuit fuse box No.1 with ignition switch
turned OFF.
2) Turn ON ignition switch, measure voltage between
engine ground and “BLK/WHT” wire terminal of A/C
condenser cooling fan control relay.
Is voltage 10 – 14 V?Go to Step 5. Go to Step 3.
1
I5RW0A110038-02