2003 NISSAN ALMERA N16 DIAGRAM

EC-636
[QG (WITHOUT EURO-OBD)]
HO2S1 HEATER
2. CHECK HO2S1 POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect heated oxygen sensor 1 harness connector.
3. Turn ignition switch “ON”.
4. Check voltage between HO2S1 terminal 4 and ground with
CONSULT-II or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3. DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors M182, E251
●Harness connectors E75, F36
●Fuse block (J/B) connector M1
●10A fuse
●Harness for open or short between heated oxygen sensor 1 and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK HO2S1 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 24 and HO2S1 terminal 1.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 5.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
MBIB0091E
Voltage: Battery voltage
PBIB0541E
Continuity should exist.

HO2S2 HEATER
EC-639
[QG (WITHOUT EURO-OBD)]
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Wiring DiagramEBS00KKI
YEC315A

HO2S2 HEATER
EC-641
[QG (WITHOUT EURO-OBD)]
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2.CHECK HO2S2 POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect heated oxygen sensor 2 harness connector.
3. Turn ignition switch “ON”.
4. Check voltage between HO2S2 terminal 4 and ground with
CONSULT-II or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3.DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors M182, E251
●Harness connectors E75, F36
●Fuse block (J/B) connector M1
●10A fuse
●Harness for open or short between heated oxygen sensor 2 and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.CHECK HO2S2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 2 and HO2S2 terminal 1.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 5.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
MBIB0256E
Voltage: Battery voltage
PBIB0541E
Continuity should exist.

EC-644
[QG (WITHOUT EURO-OBD)]
IAT SENSOR
Wiring Diagram
EBS00KKN
YEC317A

IAT SENSOR
EC-645
[QG (WITHOUT EURO-OBD)]
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Diagnostic ProcedureEBS00KKO
1.CHECK OVERALL FUNCTION
1. Turn ignition switch “ON”.
2. Check voltage between ECM terminal 34 and ground with CON-
SULT-II or tester.
OK or NG
OK >>INSPECTION END.
NG >> GO TO 2.
2.CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect mass air flow sensor (intake air temperature sensor
is built-into) harness connector.
3. Turn ignition switch “ON”.
4. Check voltage between MAF sensor terminal 5 and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
3.CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 67 and mass air flow sensor terminal 3.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 4.
NG >> Repair open circuit or short to ground or short to power in harness or connectors. Voltage: Approximately 0 - 4.8V
MBIB0041E
MBIB0096E
Voltage: Approximately 5V
PBIB0066E
Continuity should exist.

EC-648
[QG (WITHOUT EURO-OBD)]
HO2S1
Wiring Diagram
EBS00KKT
YEC314A

HO2S1
EC-651
[QG (WITHOUT EURO-OBD)]
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8.CHECK HO2S1 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect HO2S1 harness connector.
3. Disconnect ECM harness connector.
4. Check harness continuity between ECM terminal 74 and HO2S1
terminal 3. Refer to Wiring Diagram.
5. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 9.
NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
9.CHECK HO2S1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 35 and HO2S1 terminal 2.
Refer to Wiring Diagram.
2. Check harness continuity between ECM terminal 35 or HO2S1 terminal 2 and ground.
Refer to Wiring Diagram.
3. Also check harness for short to power.
OK or NG
OK >> GO TO 10.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
10.CHECK HEATED OXYGEN SENSOR 1 HEATER
Refer to EC-637, "
Component Inspection" .
OK or NG
OK >> GO TO 11.
NG >> Replace malfunctioning heated oxygen sensor 1.
11 . CHECK MASS AIR FLOW SENSOR
Refer to EC-500, "
Component Inspection" .
OK or NG
OK >> GO TO 12.
NG >> Replace mass air flow sensor.
12.CHECK PCV VALVE
Refer to EC-720, "
Component Inspection" .
OK or NG
OK >> GO TO 13.
NG >> Replace PCV valve.
13.CHECK HEATED OXYGEN SENSOR 1
Refer to EC-652, "
Component Inspection" .
OK or NG
OK >> GO TO 14.
NG >> Replace malfunctioning heated oxygen sensor 1.Continuity should exist.
MBIB0091E
Continuity should exist.
Continuity should not exist.

HO2S2
EC-655
[QG (WITHOUT EURO-OBD)]
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EC
Wiring DiagramEBS00KKZ
YEC315A