Nissan Terrano model r20 series 2004. Manual — part 164
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-378
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-379
Wiring Diagram
LHD MODELS
YEC673A
DTC P0100 MASS AIR FLOW SEN
TD27Ti
EC-380
RHD MODELS
YEC674A
DTC P0100 MASS AIR FLOW SEN
TD27Ti
Wiring Diagram (Cont’d)
EC-381
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