Nissan Terrano r20e. Instruction — part 179
Diagnostic Procedure
INSPECTION START
Start engine.
Is engine running?
Yes
E
No
CHECK POWER SUPPLY-I.
1. Turn ignition switch to “ON” posi-
tion.
2. Check voltage between ECM
connector terminal
507
and
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
B
“CHECK GROUND CIR-
CUIT”.
CHECK POWER SUPPLY-II.
1. Stop engine.
2. Check voltage between ECM
connector terminal
325
and
engine ground with CON-
SULT-II or voltage tester.
Voltage: Battery voltage
OK
E
NG
Check the following:
I
ECM 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.
q
A
NEF642
YEC283A
MEC946D
MEC943D
H
H
H
H
TROUBLE DIAGNOSIS FOR POWER SUPPLY
TD27Ti
EC-353
q
A
CHECK POWER SUPPLY-III.
1. Turn ignition switch to “ON” position
and then to “LOCK” position.
2. Check voltage between ECM connector
terminals
107
,
108
,
109
and engine
ground with CONSULT-II or tester.
Voltage:
After turning ignition switch to
“LOCK” position, battery voltage
will exist for a few seconds, then
drop to approximately 0V.
NG
E
OK
Go to
q
B
“CHECK
GROUND CIRCUIT”.
Case-1: Battery voltage does
not exist.
Case-2: Battery voltage exists
for more than a few
seconds.
Case-1
Case-2
E
Go to
“CHECK ECM
RELAY”.
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
325
and
ECM relay connector terminal
q
2
, and
ECM connector terminals
107
,
108
,
109
and ECM relay connector termi-
nal
q
5
. Refer to wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
E
NG
Check the following:
I
Harness 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
,
q
3
and engine ground
with CONSULT-II or tester.
Voltage: Battery voltage
OK
E
NG
Check the following:
I
20A 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
1
and
q
2
.
3. Check continuity between relay termi-
nals
q
3
and
q
5
.
12V (
q
1
-
q
2
) applied:
Continuity exists.
No voltage applied:
No continuity
OK
E
NG
Replace ECM relay.
q
B
MEC944D
MEC945D
NEF350
H
H
H
H
H
TROUBLE DIAGNOSIS FOR POWER SUPPLY
TD27Ti
Diagnostic Procedure (Cont’d)
EC-354
q
B
CHECK GROUND CIRCUIT.
1. Turn ignition switch to “LOCK” position.
2. Disconnect ECM harness connector.
3. Check harness continuity between
ECM connector terminals
104
,
105
,
106
and engine ground. Refer to wir-
ing diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
E
NG
Check the following:
I
Engine 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 SUPPLY
TD27Ti
Diagnostic Procedure (Cont’d)
EC-355
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
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 “ON” position.
2) Select “DATA MONITOR” 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 “Diagnostic Test Mode II” (Self-diagnostic results).
SEF781K
SEF817Y
DTC P0100 MASS AIR FLOW SEN
TD27Ti
EC-356
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