2002 NISSAN TERRANO engine control

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
DTC Malfunction is detected when...Check Items
(Possible Cause)
P0100
0102IAn excessively high or low voltage from the sensor is
entered to ECM.IHarness or connectors
(The sensor circuit is open or short-circuited.)
IMass 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-356

Diagnostic Procedure
INSPECTION START
CHECK POWER SUPPLY.
1. Turn ignition switch to ªLOCKº position.
2. Disconnect electrical fuel injection
pump harness connector.
3. Turn ignition switch to ªONº position.
4. Check voltage between electronic con-
trol fuel injection pump (Fuel tempera-
ture sensor) harness connector termi-
nalq
6and engine ground with CON-
SULT-II or tester.
Voltage:
Approximately 4.9V
OK
ENG
Check the following:
IHarness for open or
short-circuit between
ECM and electronic con-
trol fuel injection pump
(fuel temperature sen-
sor)
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch to ªLOCKº position.
2. Check harness continuity between
electronic control fuel injection pump
(fuel temperature sensor) connector
terminalq
5and ECM connector
terminal
335. Refer to wiring dia-
gram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG
Check the following:
IHarness for open or
short-circuit between
ECM and electronic con-
trol fuel injection pump
(fuel temperature sen-
sor).
If NG, repair harness or
connectors.
CHECK COMPONENT
[Electronic control fuel injection pump
(Fuel temperature sensor)].
Refer to ªCOMPONENT INSPECTIONº on
page EC-375.
OK
ENG
Have the injection pump
assembly serviced by an
authorised service repre-
sentative.
Disconnect and reconnect harness con-
nectors in the circuits. Then retest.
Trouble is not fixed.
Check ECM pin terminals for damage and
check the connection of ECM harness
connector. Reconnect ECM harness con-
nector and retest.
INSPECTION END
YEC248A
YEC254A
H
H
H
H
H
H
DTC P0180 FUEL TEMP SENSORTD27Ti
EC-374

Diagnostic Procedure
INSPECTION START
CHECK FOR AIR IN FUEL FILTER.
1. Move priming pump up and down to
purge air from fuel filter.
2. Perform ªDIAGNOSTIC TROUBLE
CODE CONFIRMATION PROCE-
DUREº.
CHECK POWER SUPPLY.
1. Turn ignition switch to ªLOCKº position.
2. Disconnect TVC and shut-off (injection
timing control valve) harness connec-
tor.
3. Turn ignition switch to ªONº position.
4. Check voltage between TVC and shut-
off (injection timing control valve) con-
nector terminalq
9and engine ground
with CONSULT-II or tester.
Voltage: Battery voltage
OK
ENG
Check the following:
IHarness connector
M787,F66
I20A fuse
IECM relay
IHarness for open or
short-circuit between
TVC and shut-off (injec-
tion timing control valve)
harness connector and
fuse box.
If NG, replace 20A fuse or
ECM relay, harness or con-
nectors.
CHECK OUTPUT SIGNAL CIRCUIT.
1. Turn ignition switch to ªLOCKº position.
2. Disconnect ECM harness connector.
3. Check harness continuity between TVC
and shut-off (injection timing control
valve) connector terminalq
8and ECM
terminals
202. Refer to wiring dia-
gram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG
Check the following:
IHarness for open or
short-circuit between
TVC and shut-off (injec-
tion timing control valve)
and ECM
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT.
1. Disconnect ECM harness connector.
2. Check harness continuity between
ECM connector terminal
349and TVC
and shut-off (injection timing control
valve) connector terminalq
10. Refer to
wiring diagram.
Continuity should exist.
If OK, check harness of short-circuit.
OK
ENG
Repair harness or connec-
tors
qA
YEC256A
NEF463
MEC947D
H
H
H
H
H
DTC P0216 INJ TIMING CONT/V, DTC P1246 F/INJ TIMG F/BTD27Ti
EC-383

Component Description
CRANKSHAFT POSITION SENSOR (TDC)
The crankshaft position sensor (TDC) monitors engine speed by
means of signals from the sensing plate (with four protrusions)
installed to the clutch housing. The datum signal output is detected
at ATDC 30É and sent to the ECM. The sensor signal is used for
fuel injection control and fuel injection timing control.
On Board Diagnosis Logic
DTC Malfunction is detected when ....Check Items
(Possible cause)
P0335
0407IAn improper signal from the sensor is detected by
ECM during engine running and cranking.IHarness or connectors
(The sensor circuit is open)
ICrankshaft position sensor (TDC)
DTC Confirmation Procedure
IIf DTC P1240 is displayed same time, perform trouble diag-
nosis for DTC P1240 first.
IBefore performing the following procedure, confirm that
battery voltage is more than 9V.
WITH CONSULT-II
1) Turn ignition switch to ªONº position and select ªDATA MONI-
TORº mode with CONSULT-II.
2) Start engine and run it for at least 3 seconds at above 1,200
rpm.
WITHOUT CONSULT-II
1) Start engine and run it for at least 3 seconds at above 1,200
rpm.
2) Turn ignition switch to ªLOCKº position, wait at least 5 seconds
and then turn to ªONº position.
3) Perform ªDiagnostic Test Mode IIº (Self-diagnostic results).
NEF710
NEF711
DTC P0335 CRANK POS SEN (TDC)TD27Ti
EC-385

System Description
GLOW CONTROL
Engine coolant temperature sensorEEngine coolant temperature
ECMEGlow relayEGlow plugs
Ignition switchEStart signalEGlow lamp
IPre-glow
When the ignition switch is turned on the ON position, the glow
indicator lamp will turn ON and pre-glow starts.
The glow relay is turned ON continuously. The ON time of both
the glow indicator lamp and the glow relay is determined by the
engine coolant temperature. Pre-glow ends when the pre-glow
time elapses or when the engine is started.
IIntermediate glow
Intermediate glow starts when the pre-glow time has elapsed
and the engine has not been started. The glow relay is turned
ON intermittently. Intermediate glow ends when the intermedi-
ate glow time has elapsed, or when the engine is started.
IAfter-glow
After-glow starts as soon as the engine is running and the
engine coolant temperature is below 50ÉC (122ÉF). The glow
relay is turned on continuously. After-glow ends when the after-
glow time elapses, or when the engine coolant temperature
exceeds 50ÉC (122ÉF).
MEC972D
DTC P0380 GLOW RELAY, DTC P0381 GLOW LAMPTD27Ti
EC-389

Diagnostic Procedure
INSPECTION START
Check fuel level, fuel supply system,
starter motor, etc.
OK
ENG
Correct.
Check that all glow plug connecting plate
nuts are installed correctly.
OK
ENG
Install correctly.
CHECK OVERALL FUNCTION.
Check entire glow control system.
NG
EOK
CHECK COMPONENT
(Glow plug).
Refer to EC-396.
CHECK VOLTAGE BETWEEN GLOW
RELAY AND GROUND.
1. Disconnect glow relay.
2. Check voltage between glow relay con-
nector terminalq
5and engine ground
with tester.
Voltage: Battery voltage
OK
ENG
Check the following:
I80A fusible link in fusible
link box
IHarness continuity
between glow relay and
battery positive terminal.
If NG, replace fuse or fus-
ible link or repair harness
or connectors.
CHECK VOLTAGE BETWEEN GLOW
RELAY AND GROUND.
1. Turn ignition switch to ªONº position.
2. Check voltage between glow relay con-
nector terminalsq
2and engine ground
with tester.
Voltage: Battery voltage
OK
ENG
Check the following:
I20A fusible link in fusible
link box
IECM relay
IHarness continuity
between glow relay and
battery positive terminal.
If NG, replace fuse or fus-
ible link or repair harness
or connectors.
CHECK OUTPUT SIGNAL CIRCUIT.
1. Turn ignition switch to ªLOCKº position.
2. Disconnect ECM harness connector.
3. Check harness continuity between
ECM connector terminal
214and
glow relay connector terminalq
1. 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)
IHarness continuity
between glow relay and
ECM
If NG, repair harness or
connectors.
CHECK HARNESS CONTINUITY
BETWEEN GLOW RELAY AND GLOW
PLUG.
1. Disconnect glow plug connector.
2. Check harness continuity between glow
relay connector terminalq
3and glow
plug connector terminalq
1. Refer to
wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG
Check the following.
IHarness connectors
M740,E142
IHarness continuity
between glow relay and
glow plug
If NG, repair harness or
connectors.
qA
NEF504
MEC950D
MEC951D
H
H
H
H
H
H
H
H
DTC P0380 GLOW RELAY, DTC P0381 GLOW LAMPTD27Ti
EC-393

System Operation Check
Set voltmeter between glow plug and engine body.
1. Pre-glow control
a. Turn ignition switch to ªONº position.
b. Read voltage and time.
Battery voltage will continuously appear for about 20*
seconds after ignition switch is turned ªONº.
* Engine coolant temperature is higher than 20ÉC
(68ÉF).
* Repeatedly turning the ignition switch to ªONº posi-
tion and then back to ªLOCKº position may change
the glow time.
2. Intermediate-glow control
a. Turn ignition switch to ªLOCKº position. Wait at least 5 seconds.
b. Turn ignition switch to ªONº.
c. Read voltage.
Battery voltage will intermittently appear for about 60
seconds after pre-glow control time has elapsed.
3. After-glow control
Start engine and read voltage and time.
Battery voltage will appear for max. 10 minutes.
When engine coolant temperature is lower than 50ÉC
(122ÉF).
NEF506
NEF726
NEF727
NEF728
DTC P0380 GLOW RELAY, DTC P0381 GLOW LAMPTD27Ti
EC-395

Component Description
Malfunction Indicator (MI) is located on the instrument panel. When the ignition switch is turned ON without
engine running, MI will light up. This is a bulb check. When the engine is started, MI should go off. If MI remains
on, the on board diagnostic system has detected an engine system malfunction.
On Board Diagnosis Logic
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0650
0907Malfunction indicator (MI) control cir-
cuitIAn excessively high voltage is sent
to ECM through the MI circuit
under the condition that calls for MI
light up.
IAn excessively low voltage is sent
to ECM through the MI circuit
under the condition that calls for MI
not to light up.IHarness or connectors
(MI circuit is open or shorted.)
IMI
DTC Confirmation Procedure
NOTE:
If ªDTC Confirmation Procedureº has been previously
conducted, always turn ignition switch ªOFFº and wait at least
10 seconds before conducting the next test.
WITH CONSULT-II
1. Turn ignition switch ªONº.
2. Select ªDATA MONITORº mode with CONSULT-II.
3. Start engine and let it idle for 2 second.
WITHOUT CONSULT-II
1. Turn ignition switch ªONº.
2. Perform ªDiagnostic Test Mode IIº (Self-diagnostic results).
3. Start engine and let it idle for 2 second.
4. Perform ªDiagnostic Test Mode IIº (Self-diagnostic results).
SEF817Y
DTC P0650 MITD27Ti
EC-404