2004 NISSAN TERRANO Service Repair Manual

TERMI-NALNO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage and
Pulse Signal)
426 B Accelerator position switch
(Idle) ground [Ignition switch ªONº]
Approximately 0V
433 R/W Accelerator position sen-
sor power supply [Ignition switch ªONº]
Approximately 5V
434 G Accelerator position sen-
sor [Ignition switch ªONº]
I
Accelerator pedal fully released 0.30 - 0.50V
[Ignition switch ªONº]
I Accelerator pedal fully depressed 3.0 - 4.3V
435 L/Y Accelerator position switch
(Idle) [Ignition switch ªONº]
I
Accelerator pedal fully released Approximately 0V
[Ignition switch ªONº]
I Accelerator pedal depressed BATTERY VOLTAGE
(11 - 14V)
439 L/B Tachometer [Engine is running]
I
Warm-up condition
I Idle speed Approximately 3.0V
SEF325Y
[Engine is running]
I
Warm-up condition
I Engine speed is 2,000 rpm Approximately 3.0V
SEF326Y
507 B/W Ignition switch
[Ignition switch ªOFFº]
0V
[Ignition switch ªONº] BATTERY VOLTAGE
(11 - 14V)
TROUBLE DIAGNOSESTD27Ti
ECM Terminals and Reference Value (Cont'd)
EC-374
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Wiring Diagram
YEC672A
TROUBLE DIAGNOSIS FOR POWER SUPPLYTD27Ti
EC-375
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Diagnostic Procedure
INSPECTION START
Start engine.
Is engine running?
Ye s
ENoCHECK POWER SUPPLY-I.
1. Turn ignition switch to ªONº posi-
tion.
2. Check voltage between ECM connector terminal
507and
engine ground with
CONSULT-II or voltage tester.
Voltage: Battery voltage
If NG, check the following:
I 10A fuse
I Harness for open or short-circuit
between ECM and ignition switch
If NG, replace 10A fuse or repair
harness or connectors.
OK
Go to q
BªCHECK GROUND CIR-
CUITº.
CHECK POWER SUPPLY-II.
1. Stop engine.
2. Check voltage between ECM connector terminal
325and
engine ground with CON-
SULT-II or voltage tester.
Voltage: Battery voltage
OK
ENG Check the following:
IECM relay
I 20A fuse
I Harness for open or short-circuit
between ECM and battery
I Harness connectors M787, F66
(LHD models)
I Battery connection and charge
If NG, replace fuse or charge bat-
tery or repair harness or connec-
tors.
qA
NEF642
YEC283A
MEC946D
MEC943D
H
H
H
H
TROUBLE DIAGNOSIS FOR POWER SUPPLYTD27Ti
EC-376
http://vnx.su/

qA
CHECK POWER SUPPLY-III.
1. Turn ignition switch to ªONº positionand then to ªLOCKº position.
2. Check voltage between ECM connector terminals
107,108,109and engine
ground with CONSULT-II or tester.
Voltage: After turning ignition switch to
ªLOCKº position, battery voltage
will exist for a few seconds, then
drop to approximately 0V.
NG
EOK Go toqBªCHECK
GROUND CIRCUITº.
Case-1: Battery voltage does not exist.
Case-2: Battery voltage exists for more than a few
seconds.
Case-1 Case-2
EGo toªCHECK ECM
RELAYº.
CHECK HARNESS CONTINUITY
BETWEEN ECM RELAY AND ECM.
1. Disconnect ECM harness connector.
2. Disconnect ECM relay harness connec- tor.
3. Check harness continuity between ECM connector terminals
325and
ECM relay connector terminal q
2, and
ECM connector terminals
107,108,
109and ECM relay connector termi-
nal q
5. Refer to wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG Check the following:
IHarness connectors
M787,F66(LHD mod-
els)
I Harness for open or
short-circuit between
ECM relay connector
and ECM connector.
If NG, repair harness or
connectors.
CHECK VOLTAGE BETWEEN ECCS
RELAY AND ENGINE GROUND.
Check voltage between ECM relay con-
nector terminals q
1,q3and engine ground
with CONSULT-II or tester.
Voltage: Battery voltage
OK
ENG Check the following:
I20A fuse
I Fuse box and battery
connections
I Harness for open or
short-circuit between
ECM relay and battery
If NG, replace fuse or
repair harness or connec-
tors.
CHECK ECM RELAY.
1. Remove ECM relay.
2. Apply 12V direct current between relay terminals q
1andq2.
3. Check continuity between relay termi- nals q
3andq5.
12V ( q
1-q2) applied:
Continuity exists.
No voltage applied: No continuity
OK
ENG Replace ECM relay.
qB
MEC944D
MEC945D
NEF350
H
H
H
H
H
TROUBLE DIAGNOSIS FOR POWER SUPPLYTD27Ti
Diagnostic Procedure (Cont'd)
EC-377
http://vnx.su/

qB
CHECK GROUND CIRCUIT.
1. Turn ignition switch to ªLOCKº position.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM connector terminals
104,105,
106and engine ground. Refer to wir-
ing diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG Check the following:
IEngine ground connec-
tions
I Harness for open or
short-circuit between
ECM and engine ground
If NG, repair harness or
connectors.
Check ECM pin terminals for damage and
check the connection of ECM harness
connector.
INSPECTION END
H
H
H
TROUBLE DIAGNOSIS FOR POWER SUPPLYTD27Ti
Diagnostic Procedure (Cont'd)
EC-378
http://vnx.su/

Component Description
MASS AIR FLOW SENSOR (MAFS)
The mass air flow sensor measures the intake air flow rate by
monitoring a part of the entire flow. Measurements are made by the
ECM which receives electrical signals from the mass air flow sen-
sor which is proportional to the amount of heat emitted from the hot
wire placed in the stream of the intake air.
When intake air flows into the intake manifold through a route
around the hot wire, the heat generated by the hot wire is carried
away by the air flow. The amount of heat detected depends on the
volume of air flow. The temperature of the hot wire is automatically
controlled to maintain it within a finite range regardless of the air
flow rate by regulating the current supplied to the hot wire.
The ECM monitors the air flow by means of the corresponding
electric change.
On Board Diagnosis Logic
DTCMalfunction is detected when... Check Items
(Possible Cause)
P0100
0102 I
An excessively high or low voltage from the sensor is
entered to ECM. I
Harness or connectors
(The sensor circuit is open or short-circuited.)
I Mass air flow sensor
DTC Confirmation Procedure
WITH CONSULT-II
1) Turn ignition switch to ªONº position.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Start engine and wait for at least 15 seconds.
WITHOUT CONSULT-II
1) Start engine and wait for at least 15 seconds.
2) Turn ignition switch off, wait for at least 5 seconds and then turn
on.
3) Perform ªDiagnostic Test Mode IIº (Self-diagnostic results).
SEF781K
SEF817Y
DTC P0100 MASS AIR FLOW SENTD27Ti
EC-379
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Wiring Diagram
LHD MODELS
YEC673A
DTC P0100 MASS AIR FLOW SENTD27Ti
EC-380
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RHD MODELS
YEC674A
DTC P0100 MASS AIR FLOW SENTD27Ti
Wiring Diagram (Cont'd)EC-381
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