diagram NISSAN TEANA 2003 Service Manual

FUEL INJECTOR
EC-689
[VQ]
C
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EC

9. CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between fuel injector terminal 2 and ECM terminals 21, 22, 23, 40, 41, 42.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 11.
NG >> GO TO 10.
10. DETECT MALFUNCTIONING PART
Check the following.

Harness connectors F1, F251

Harness for open or short between fuel injector and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
11 . CHECK FUEL INJECTOR
Refer to EC-689, "
Component Inspection" .
OK or NG
OK >> GO TO 12.
NG >> Replace fuel injector.
12. CHECK INTERMITTENT INCIDENT
Refer to EC-450, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionBBS0056N
FUEL INJECTOR
1. Disconnect fuel injector harness connector.
2. Check resistance between terminals as shown in the figure.
Removal and InstallationBBS0056O
FUEL INJECTOR
Refer to EM-155, "FUEL INJECTOR AND FUEL TUBE" . Continuity should exist.
Resistance:
VQ23DE: 13.5 - 17.5 [at 10 - 60°C (50 - 140°F)]
VQ35DE: 11.1 - 14.5 [at 10 - 60°C (50 - 140°F)]
PBIB1727E

FUEL PUMP
EC-691
[VQ]
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Wiring DiagramBBS0056R
TBWM0642E

EC-694
[VQ]
FUEL PUMP

7. CHECK CONDENSER POWER SUPPLY CIRCUIT-II
1. Disconnect IPDM E/R harness connector E8.
2. Check harness continuity between IPDM E/R terminal 39 and condenser terminal 1.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 13.
NG >> GO TO 8.
8. DETECT MALFUNCTIONING PART
Check the following.

Harness connectors E11, E253

Harness connectors B202, E104

Harness for open or short between IPDM E/R and condenser
>> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK CONDENSER GROUND CIRCUIT
1. Check harness continuity between condenser terminal 2 and ground.
Refer to Wiring Diagram.
2. Also check harness for short to power.
OK or NG
OK >> GO TO 10.
NG >> Repair open circuit or short to power in harness or connectors.
10. CHECK CONDENSER
Refer to EC-695, "
Component Inspection" .
OK or NG
OK >> GO TO 11.
NG >> Replace condenser.
11 . CHECK FUEL PUMP POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect harness connectors E104, B202
3. Disconnect “fuel level sensor unit and fuel pump” harness con-
nector.
4. Check harness continuity between “fuel level sensor unit and
fuel pump” terminal 1 and harness connector B202 terminal 1,
“fuel level sensor unit and fuel pump” terminal 3 and ground.
Refer to Wiring Diagram.
5. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 12.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.Continuity should exist.
Continuity should exist.
Continuity should exist.PBIB2121E

HO2S1
EC-697
[VQ]
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EC

Wiring DiagramBBS0055Q
BANK 1
TBWM1535E

EC-702
[VQ]
HO2S1

6. CHECK FOR EXHAUST GAS LEAK
1. Start engine and run it at idle.
2. Listen for an exhaust gas leak before three way catalyst (manifold).
OK or NG
OK >> GO TO 7.
NG >> Repair or replace.
7. CHECK FOR INTAKE AIR LEAK
Listen for an intake air leak after the mass air flow sensor.
OK or NG
OK >> GO TO 8.
NG >> Repair or replace.
8. CHECK HO2S1 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect heated oxygen sensor 1 harness connector.
3. Disconnect ECM harness connector.
4. Check harness continuity between ECM terminal 78 and HO2S1 terminal 4.
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.
SEC502D
Continuity should exist.
PBIB2468E

HO2S1
EC-703
[VQ]
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EC

9. CHECK HO2S1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal and HO2S1 terminal as follows.
Refer to Wiring Diagram.
2. Check harness continuity between the following terminals 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 MASS AIR FLOW SENSOR
Refer to EC-472, "
Component Inspection" .
OK or NG
OK >> GO TO 11.
NG >> Replace mass air flow sensor.
11 . CHECK PCV VALVE
Refer to EC-370, "
Component Inspection" .
OK or NG
OK >> GO TO 12.
NG >> Replace PCV valve.
12. CHECK HEATED OXYGEN SENSOR 1
Refer to EC-704, "
Component Inspection" .
OK or NG
OK >> GO TO 13.
NG >> Replace malfunctioning heated oxygen sensor 1.
13. CHECK INTERMITTENT INCIDENT
Refer to EC-450, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Te r m i n a l s
Bank
ECM Sensor
35 1 1
16 1 2
Continuity should exist.
Te r m i n a l s
Bank
ECM Sensor
35 1 1
16 1 2
Continuity should not exist.

HO2S1 HEATER
EC-707
[VQ]
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EC

Wiring DiagramBBS00559
BANK 1
TBWM1535E

EC-712
[VQ]
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 3 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 E39, F41

IPDM E/R connector E7

15A fuse

Harness for open or short between heated oxygen sensor 1 and fuse
>> Repair 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 and HO2S1 terminal as follows.
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.Voltage: Battery voltage
PBIB2468E
PBIB0112E
Terminals
Bank
ECM Sensor
221
24 2 2
Continuity should exist.

HO2S2
EC-715
[VQ]
C
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EC

Wiring DiagramBBS0055W
BANK 1
TBWM1537E

HO2S2
EC-719
[VQ]
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EC

2. CHECK OVERALL FUNCTION - II
Keep engine at idle for 10 minutes, then check the voltage between ECM terminal 74 [HO2S2 (B1) signal] or
55 [HO2S2 (B2) signal] and ground, or check the voltage when coasting at 80 km/h (50 MPH) in D position
with “OD” OFF.
OK or NG
OK >>INSPECTION END
NG >> GO TO 3.
3. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws on the body.
Refer to EC-457, "
Ground Inspection" .
OK or NG
OK >> GO TO 4.
NG >> Repair or replace ground connections.
4. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Disconnect heated oxygen sensor 2 harness connector.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 78 and HO2S2 terminal 4.
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.The voltage does not remain in the range of 0.2 - 0.4V
PBIB2160E
Continuity should exist.
PBIB2145E