Nissan Terrano r20e. Instruction — part 180
Wiring Diagram
LHD MODELS
YEC142A
DTC P0100 MASS AIR FLOW SEN
TD27Ti
EC-357
RHD MODELS
YEC143A
DTC P0100 MASS AIR FLOW SEN
TD27Ti
Wiring Diagram (Cont’d)
EC-358
Diagnostic Procedure
INSPECTION START
CHECK POWER SUPPLY.
1. Turn ignition switch to “LOCK” position.
2. Disconnect mass air flow sensor har-
ness connector.
3. Turn ignition switch to “ON” position.
4. Check voltage between mass air flow
sensor connector terminal
q
2
and
engine ground with CONSULT-II or
tester.
Voltage: Battery positive voltage
OK
E
NG
Check the following:
I
20A fuse
I
ECM Relay
I
Harness continuity
between ECM relay (coil
and load side) connector
and battery supply
I
Harness connectors
F100
,
M755
(RHD mod-
els)
I
Harness connectors
M787
,
F66
(LHD mod-
els)
I
Harness continuity
between ECM relay con-
nector and Mass Air
Flow Sensor Connector.
If NG, replace 20A fuse or
ECM relay, or repair har-
ness or connectors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch to “LOCK” position.
2. Disconnect ECM harness connector.
3. Loosen and retighten engine ground
screws.
4. Check harness continuity between
mass air flow sensor harness connec-
tor terminal
q
3
and ECM connector ter-
minal
218
. Refer to wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
E
NG
Check the following.
I
Harness connectors
F100
,
M755
(RHD mod-
els)
I
Harness continuity
between mass air flow
sensor and ECM
If NG, repair or replace
harness or connectors.
CHECK INPUT SIGNAL CIRCUIT.
Check harness continuity between mass
air flow sensor connector terminal
q
4
and
ECM connector terminal
223
. Refer to
wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
E
NG
Check the following.
I
Harness connectors
F100
,
M755
(RHD mod-
els)
I
Harness continuity
between mass air flow
sensor and ECM
If NG, repair or replace
harness or connectors.
CHECK INPUT SIGNAL CIRCUIT.
Check harness continuity between mass
air flow sensor connector terminal
q
5
and
ECM connector terminal
224
. Refer to
wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
E
NG
Check the following.
I
Harness connectors
F100
,
M755
(RHD mod-
els)
I
Harness continuity
between mass air flow
sensor and ECM
If NG, repair or replace
harness or connectors.
CHECK COMPONENT
(Mass air flow sensor).
Refer to “COMPONENT INSPECTION”,
EC-360.
OK
E
NG
Replace mass air flow sen-
sor.
q
A
NEF664
NEF591
NEF352
H
H
H
H
H
H
DTC P0100 MASS AIR FLOW SEN
TD27Ti
EC-359
q
A
Disconnect and reconnect harness
connectors, then retest.
Trouble is not fixed.
Check ECM pin terminals for damage or
the connection of ECM harness connector.
Reconnect ECM harness connector and
retest.
INSPECTION END
Component Inspection
MASS AIR FLOW SENSOR
1. Turn ignition switch to “ON” position.
2. Start engine and warm it up sufficiently.
3. Check voltage between mass air flow sensor connector termi-
nal
q
5
and engine ground.
Condition
Voltage V
Ignition switch “ON” position (Engine stopped.)
Approx. 1.0
Idle (Engine is warmed-up sufficiently.)
Approx. 2.2
4. If NG, remove mass air flow sensor from air duct. Check hot film
for damage or dust.
MEC957D
NEF669
H
H
H
DTC P0100 MASS AIR FLOW SEN
TD27Ti
Diagnostic Procedure (Cont’d)
EC-360
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