maf NISSAN TEANA 2003 User Guide

DTC P0102, P0103 MAF SENSOR
EC-129
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6. CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between MAF sensor terminal 4 and ECM terminal 67.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 7.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
7. CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between MAF sensor terminal 3 and ECM terminal 50.
Refer to Wiring Diagram.
2. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 8.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
8. CHECK MASS AIR FLOW SENSOR
Refer to EC-129, "
Component Inspection" .
OK or NG
OK >> GO TO 9.
NG >> Replace mass air flow sensor.
9. CHECK INTERMITTENT INCIDENT
Refer to EC-105, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionBBS005D4
MASS AIR FLOW SENSOR
With CONSULT-II
1. Reconnect all harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
3. Connect CONSULT-II and select “DATA MONITOR” mode.
4. Select “MAS A/F SE-B1” and check indication under the follow-
ing conditions.
*: Check for liner voltage rise in response to engine being increased to about
4,000 rpm.
5. If the voltage is out of specification, proceed the following.
a. Check for the cause of uneven air flow through mass air flow sensor. Refer to following.Continuity should exist.
Continuity should exist.
Condition MAS A/F SE-B1 (V)
Ignition switch ON (Engine stopped.) Approx. 0.4
Idle (Engine is warmed-up to normal
operating temperature.)0.7 - 1.0
Idle to about 4,000 rpm 0.7 - 1.0 to Approx. 2.4*
SEF178Y

EC-130
[QR]
DTC P0102, P0103 MAF SENSOR


Crushed air ducts

Malfunctioning seal of air cleaner element

Uneven dirt of air cleaner element

Improper specification of intake air system parts
b. If NG, repair or replace malfunctioning part and perform step 2 to 4 again.
If OK, go to next step.
6. Turn ignition switch OFF.
7. Disconnect mass air flow sensor harness connector and reconnect it again.
8. Perform step 2 to 4 again.
9. If NG, clean or replace mass air flow sensor.
Without CONSULT-II
1. Reconnect all harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
3. Check voltage between ECM terminal 50 (Mass air flow sensor
signal) and ground.
*: Check for liner voltage rise in response to engine being increased to about
4,000 rpm.
4. If the voltage is out of specification, proceed the following.
a. Check for the cause of uneven air flow through mass air flow sensor. Refer to following.

Crushed air ducts

Malfunctioning seal of air cleaner element

Uneven dirt of air cleaner element

Improper specification of intake air system parts
b. If NG, repair or replace malfunctioning part and perform step 2 to 3 again.
If OK, go to next step.
5. Turn ignition switch OFF.
6. Disconnect mass air flow sensor harness connector and reconnect it again.
7. Perform step 2 and 3 again.
8. If NG, clean or replace mass air flow sensor.
Removal and InstallationBBS005D5
MASS AIR FLOW SENSOR
Refer to EM-17, "AIR CLEANER AND AIR DUCT" .
Condition Voltage V
Ignition switch ON (Engine stopped.) Approx. 0.4
Idle (Engine is warmed-up to normal
operating temperature.)0.7 - 1.0
Idle to about 4,000 rpm 0.7 - 1.0 to Approx. 2.4*
MBIB0017E

INDEX FOR DTC
EC-347
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[VQ]INDEX FOR DTCPFP:00024
DTC No. IndexBBS004XA
NOTE:
If DTC U1000 or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC U1000,
U1001. Refer to EC-458, "
DTC U1000, U1001 CAN COMMUNICATION LINE" .
DTC*1Items
(CONSULT-II screen terms)Reference page
CONSULT-II
ECM*
2
No DTC
Flashing*3NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.EC-378
U1000
1000*4CAN COMM CIRCUITEC-458
U1001
1001*4CAN COMM CIRCUITEC-458
P0000 0000NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.—
P0011 0011 INT/V TIM CONT-B1EC-461
P0021 0021 INT/V TIM CONT-B2EC-461
P0102 0102 MAF SEN/CIRCUITEC-466
P0103 0103 MAF SEN/CIRCUITEC-466
P0117 0117 ECT SEN/CIRCEC-474
P0118 0118 ECT SEN/CIRCEC-474
P0122 0122 TP SEN 2/CIRCEC-479
P0123 0123 TP SEN 2/CIRCEC-479
P0132 0132 HO2S1 (B1)EC-486
P0134 0134 HO2S1 (B1)EC-496
P0152 0152 HO2S1 (B2)EC-486
P0154 0154 HO2S1 (B2)EC-496
P0222 0222 TP SEN 1/CIRCEC-505
P0223 0223 TP SEN 1/CIRCEC-505
P0327 0327 KNOCK SEN/CIRC-B1EC-512
P0328 0328 KNOCK SEN/CIRC-B1EC-512
P0335 0335 CKP SEN/CIRCUITEC-517
P0340 0340 CMP SEN/CIRC-B1EC-524
P0345 0345 CMP SEN/CIRC-B2EC-524
P0550 0550 PW ST P SEN/CIRCEC-533
P0605 0605 ECMEC-538
P1065 1065 ECM BACK UP/CIRCUITEC-541
P 1111 1111 I N T / V T I M V / C I R - B 1EC-545
P1121 1121 ETC ACTREC-552
P1122 1122 ETC FUNCTION/CIRCEC-555
P1124 1124 ETC MOT PWREC-562
P1126 1126 ETC MOT PWREC-562
P1128 1128 ETC MOTEC-568
P1136 1136 INT/V TIM V/CIR-B2EC-545
P1211 1211 TCS C/U FUNCTNEC-573
P1212 1212 TCS/CIRCEC-574

INDEX FOR DTC
EC-349
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Alphabetical IndexBBS004XB
NOTE:
If DTC U1000 or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC U1000,
U1001. Refer to EC-458, "
DTC U1000, U1001 CAN COMMUNICATION LINE" .
Items
(CONSULT-II screen terms)DTC*1
Reference page
CONSULT-II
ECM*2
APP SEN 1/CIRC P2122 2122EC-631
APP SEN 1/CIRC P2123 2123EC-631
APP SEN 2/CIRC P2127 2127EC-638
APP SEN 2/CIRC P2128 2128EC-638
APP SENSOR P2138 2138EC-652
ASCD BRAKE SW P1572 1572EC-602
ASCD SW P1564 1564EC-595
ASCD VHL SPD SEN P1574 1574EC-611
BRAKE SW/CIRCUIT P1805 1805EC-626
CAN COMM CIRCUIT U1000
1000*4EC-458
CAN COMM CIRCUIT U1001
1001*4EC-458
CKP SEN/CIRCUIT P0335 0335EC-517
CMP SEN/CIRC-B1 P0340 0340EC-524
CMP SEN/CIRC-B2 P0345 0345EC-524
CTP LEARNING P1225 1225EC-586
CTP LEARNING P1226 1226EC-588
CVT C/U FUNCT P1700 1700EC-613
ECM P0605 0605EC-538
ECM BACK UP/CIRCUIT P1065 1065EC-541
ECT SEN/CIRC P0117 0117EC-474
ECT SEN/CIRC P0118 0118EC-474
ENG OVER TEMP P1217 1217EC-575
ETC ACTR P1121 1121EC-552
ETC FUNCTION/CIRC P1122 1122EC-555
ETC MOT P1128 1128EC-568
ETC MOT PWR P1124 1124EC-562
ETC MOT PWR P1126 1126EC-562
HO2S1 (B1) P0132 0132EC-486
HO2S1 (B1) P0134 0134EC-496
HO2S1 (B2) P0152 0152EC-486
HO2S1 (B2) P0154 0154EC-496
IN PULY SPEED P1715 1715EC-622
INT/V TIM CONT-B1 P0011 0011EC-461
INT/V TIM CONT-B2 P0021 0021EC-461
I N T / V T I M V / C I R - B 1 P 1111 1111EC-545
INT/V TIM V/CIR-B2 P1136 1136EC-545
KNOCK SEN/CIRC-B1 P0327 0327EC-512
KNOCK SEN/CIRC-B1 P0328 0328EC-512
MAF SEN/CIRCUIT P0102 0102EC-466

EC-350
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INDEX FOR DTC

*1: 1st trip DTC No. is the same as DTC No.
*2: In Diagnostic Test Mode II (Self-diagnostic results).
*3: When engine is running.
*4: The troubleshooting for this DTC needs CONSULT-II.MAF SEN/CIRCUIT P0103 0103EC-466
NATS MALFUNCTION P1610 - P1615 1610 - 1615BL-139
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.No DTC
Flashing*3EC-378
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.P0000 0000 —
P-N POS SW/CIRCUIT P1706 1706EC-614
PW ST P SEN/CIRC P0550 0550EC-533
SENSOR POWER/CIRC P1229 1229EC-590
TCS C/U FUNCTN P1211 1211EC-573
TCS/CIRC P1212 1212EC-574
TP SEN 1/CIRC P0222 0222EC-505
TP SEN 1/CIRC P0223 0223EC-505
TP SEN 2/CIRC P0122 0122EC-479
TP SEN 2/CIRC P0123 0123EC-479
TP SENSOR P2135 2135EC-645
V/SP SEN (A/T OUT) P1720 1720EC-624
Items
(CONSULT-II screen terms)DTC*1
Reference page
CONSULT-II
ECM*2

ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-373
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ON BOARD DIAGNOSTIC (OBD) SYSTEMPFP:00028
IntroductionBBS004XW
The ECM has an on board diagnostic system, which detects malfunctions related to engine sensors or actua-
tors. The ECM also records various emission-related diagnostic information including:
The above information can be checked using procedures listed in the table below.
×: Applicable —: Not applicable
*: When DTC and 1st trip DTC simultaneously appear on the display, they cannot be clearly distinguished from each other.
The malfunction indicator (MI) on the instrument panel lights up when the same malfunction is detected in two
consecutive trips (Two trip detection logic), or when the ECM enters fail-safe mode. (Refer to EC-401, "
Fail-
Safe Chart" .)
Two Trip Detection LogicBBS004XX
When a malfunction is detected for the first time, 1st trip DTC and 1st trip Freeze Frame data are stored in the
ECM memory. The MI will not light up at this stage. <1st trip>
If the same malfunction is detected again during the next drive, the DTC and Freeze Frame data are stored in
the ECM memory, and the MI lights up. The MI lights up at the same time when the DTC is stored. <2nd trip>
The “trip” in the “Two Trip Detection Logic” means a driving mode in which self-diagnosis is performed during
vehicle operation. When the ECM enters fail-safe mode (Refer to EC-401, "
Fail-Safe Chart" .), the DTC is
stored in the ECM memory even in the 1st trip.
When there is an open circuit on MI circuit, the ECM cannot warn the driver by lighting up MI when there is
malfunction on engine control system.
Therefore, when electrical controlled throttle and part of ECM related diagnoses are continuously detected as
NG for 5 trips, ECM warns the driver that engine control system malfunctions and MI circuit is open by means
of operating fail-safe function.
The fail-safe function also operates when above diagnoses except MI circuit are detected and demands the
driver to repair the malfunction.
Emission-related Diagnostic InformationBBS004XY
EMISSION-RELATED DIAGNOSTIC INFORMATION ITEMS
×: Applicable –: Not applicable Emission-related diagnostic information
Diagnostic Trouble Code (DTC)
Freeze Frame data
1st Trip Diagnostic Trouble Code (1st Trip DTC)
1st Trip Freeze Frame data
DTC 1st trip DTC Freeze Frame data 1st trip Freeze Frame data
CONSULT-II×× × ×
ECM××*— —
Engine operating condition in fail-safe mode Engine speed will not rise more than 2,500 rpm due to the fuel cut
Items
(CONSULT-II screen terms)DTC*1
Trip MI Reference page
CONSULT-II
ECM*2
CAN COMM CIRCUIT U1000
1000*32—EC-458
CAN COMM CIRCUIT U1001
1001*3 2—EC-458
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.P0000 0000—— —
INT/V TIM CONT-B1 P0011 0011 2 —EC-461
INT/V TIM CONT-B2 P0021 0021 2 —EC-461
MAF SEN/CIRCUIT P0102 0102 1×EC-466
MAF SEN/CIRCUIT P0103 0103 1×EC-466
ECT SEN/CIRC P0117 0117 2×EC-474

TROUBLE DIAGNOSIS - SPECIFICATION VALUE
EC-447
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20. CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”, AND “B/FUEL SCHDL”
Select “A/F ALPHA-B1”, “A/F ALPHA-B2”, and “B/FUEL SCHDL” in “DATA MONITOR (SPEC)” mode, and
make sure that the each indication is within the SP value.
OK or NG
OK >>INSPECTION END
NG (“B/FUEL SCHDL” is more, “A/F ALPHA-B1”, “A/F ALPHA-B2” are less than the SP value)>>GO TO 21.
21. DISCONNECT AND RECONNECT MASS AIR FLOW SENSOR HARNESS CONNECTOR
1. Stop the engine.
2. Disconnect mass air flow sensor harness connector. Check pin terminal and connector for damage and
then reconnect it again.
>> GO TO 22.
22. CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”
1. Start engine.
2. Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “DATA MONITOR (SPEC)” mode, and make sure that the
each indication is within the SP value.
OK or NG
OK >> 1. Detect malfunctioning part of mass air flow sensor circuit and repair it. Refer to EC-466, "DTC
P0102, P0103 MAF SENSOR" .
2. GO TO 29.
NG >> GO TO 23.
23. CHECK “MAS A/F SE-B1”
Select “MAS A/F SE-B1” in “DATA MONITOR (SPEC)” mode, and
make sure that the indication is within the SP value.
OK or NG
OK >> GO TO 24.
NG (More than the SP value)>>Replace mass air flow sensor, and
then GO TO 29.
24. REPLACE ECM
1. Replace ECM.
2. Perform initialization of NVIS(NATS) system and registration of all NATS ignition key IDs. Refer to BL-142,
"ECM Re-Communicating Function" .
3. Perform EC-389, "
Accelerator Pedal Released Position Learning" .
4. Perform EC-389, "
Throttle Valve Closed Position Learning" .
5. Perform EC-389, "
Idle Air Volume Learning" .
>> GO TO 29.
PBIB2370E

EC-466
[VQ]
DTC P0102, P0103 MAF SENSOR

DTC P0102, P0103 MAF SENSORPFP:22680
Component DescriptionBBS004Z4
The mass air flow sensor is placed in the stream of intake air. It mea-
sures the intake flow rate by measuring a part of the entire intake
flow. The mass air flow sensor controls the temperature of the hot
wire is a certain amount. The heat generated by the hot wire is
reduced as the intake air flows around it. The more air, the greater
the heat loss.
Therefore, the electric current supplied to hot wire is changed to
maintain the temperature of the hot wire as air flow increases. The
ECM detects the air flow by means of this current change.
CONSULT-II Reference Value in Data Monitor ModeBBS004Z5
Specification data are reference values.
On Board Diagnosis LogicBBS004Z6
These self-diagnoses have the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MI lights up.
PBIB1604E
MONITOR ITEM CONDITION SPECIFICATION
MAS A/F SE-B1EC-440, "
TROUBLE DIAGNOSIS - SPECIFICATION VALUE"
DTC No.Trouble diagnosis
nameDTC detecting condition Possible cause
P0102
0102Mass air flow sensor
circuit low inputAn excessively low voltage from the sensor is
sent to ECM.

Harness or connectors
(The sensor circuit is open or shorted.)

Intake air leaks

Mass air flow sensor
P0103
0103Mass air flow sensor
circuit high inputAn excessively high voltage from the sensor is
sent to ECM.

Harness or connectors
(The sensor circuit is open or shorted.)

Mass air flow sensor
Detected items Engine operating condition in fail-safe mode
Mass air flow sensor circuit Engine speed will not rise more than 2,400 rpm due to the fuel cut.

DTC P0102, P0103 MAF SENSOR
EC-467
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DTC Confirmation ProcedureBBS004Z7
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
PROCEDURE FOR DTC P0102
With CONSULT-II
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Start engine and wait at least 5 seconds.
4. If DTC is detected, go to EC-469, "
Diagnostic Procedure" .
Without CONSULT-II
1. Start engine and wait at least 5 seconds.
2. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
3. Perform Diagnostic Test Mode II (Self-diagnostic results) with ECM.
4. If DTC is detected, go to EC-469, "
Diagnostic Procedure" .
PROCEDURE FOR DTC P0103
With CONSULT-II
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Wait at least 5 seconds.
4. If DTC is detected, go to EC-469, "
Diagnostic Procedure" .
If DTC is not detected, go to next step.
5. Start engine and wait at least 5 seconds.
6. If DTC is detected, go to EC-469, "
Diagnostic Procedure" .
Without CONSULT-II
1. Turn ignition ON and wait at least 5 seconds.
2. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
3. Perform Diagnostic Test Mode II (Self-diagnostic results) with ECM.
4. If DTC is detected, go to EC-469, "
Diagnostic Procedure" .
If DTC is not detected, go to next step.
5. Turn ignition switch OFF and wait at least 10 seconds.
6. Start engine and wait at least 5 seconds.
7. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
8. Perform Diagnostic Test Mode II (Self-diagnostic results) with ECM.
9. If DTC is detected, go to EC-469, "
Diagnostic Procedure" .
SEF058Y
SEF058Y

EC-468
[VQ]
DTC P0102, P0103 MAF SENSOR

Wiring DiagramBBS004Z8
TBWM1441E