Nissan Primera P11. Manual — part 89
p
A
CHECK VOLTAGE BETWEEN ENGINE
CONTROL MODULE RELAY AND
GROUND.
Check voltage between ECM relay connec-
tor terminals
p
2
,
p
3
and ground with
CONSULT-II or tester.
Voltage: Battery voltage
OK
E
NG
Check the following:
●
15A fuse
●
Harness for open or
short-circuit between
ECM relay and battery.
If NG, replace fuse or repair
harness or connectors.
CHECK OUTPUT SIGNAL CIRCUIT.
Check harness continuity between ECM
connector terminal
325
and ECM relay
connector terminal
p
1
.
Continuity should exist.
If OK, check harness for short-circuit.
OK
E
NG
●
Check harness connec-
tors
E43
,
F2
Repair harness or connec-
tors.
CHECK ECM RELAY.
1. Apply 12V direct current between ECM
relay connector terminals
p
1
and
p
2
.
2. Check continuity between engine control
module relay connector terminals
p
3
and
p
5
.
12V (
p
1
-
p
2
) applied:
Continuity exists.
No voltage applied:
No continuity
OK
E
NG
Replace ECM relay.
CHECK GROUND CIRCUIT.
1. Turn ignition switch to “LOCK” position.
2. Check harness continuity between ECM
connector terminals
104
,
105
,
106
and engine ground.
Continuity should exist.
If resistance is too high, loosen, clean and
retighten engine ground.
If OK, check harness for short-circuit.
OK
E
NG
Repair harness or connec-
tors.
Check ECM pin terminals for damage and
check the connection of ECM harness con-
nector.
INSPECTION END
YEC352
ECM relay
connector
NEF189A
ECM relay
connector
YEC354
ECM relay
connector
NEF190A
NEF399
Engine ground
H
H
H
H
H
H
TROUBLE DIAGNOSIS FOR POWER SUPPLY
CD20T
Main Power Supply and Ground Circuit
(Cont’d)
EC-61
Mass Air Flow Sensor (MAFS)
The mass air flow sensor measures the amount of intake air by
analysing a part of the entire flow. When intake air flows into the
intake manifold, heat is withdrawn from the hot film. By regulat-
ing the electrical current that flows through the hot film, the ECM
maintains the hot film temperature on a constant level. The
amount of electric current that is needed to keep the hot film on
a constant temperature level is proportional to the mass of air
that flows into the engine.
Malfunction is detected when . . .
Check Items
(Possible Cause)
●
An excessively high or low voltage from the sensor is
entered to ECM.
●
Harness or connectors
(The sensor circuit is open or shorted.)
●
Mass air flow sensor
DIAGNOSTIC TROUBLE CONFIRMATION
PROCEDURE
1)
Turn ignition switch to “ON” position.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Start engine and wait for at least 20 seconds.
NEF663
TROUBLE DIAGNOSIS 1
CD20T
EC-62
YEC799
BATTERY
Refer to EL-POWER.
: Detectable line for DTC
: Non-detectable line for DTC
ENGINE
CONTROL
MODULE
RELAY
MASS AIR
FLOW SEN-
SOR
ECM
TROUBLE DIAGNOSIS 1
CD20T
Mass Air Flow Sensor (MAFS) (Cont’d)
EC-63
DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK POWER SUPPLY.
1. Turn ignition switch to “LOCK” position.
2. Disconnect mass air flow sensor harness
connector.
3. Turn ignition switch to “ON” position.
4. Check voltage between mass air flow
sensor connector terminal
p
2
and
ground.
Voltage: Battery positive voltage
OK
E
NG
Repair harness or connec-
tors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch to “LOCK” position.
2. Disconnect ECM harness connector.
3. Check harness continuity between mass
air flow sensor connector terminal
p
3
and ECM connector terminal
218
.
Continuity should exist.
If OK, check harness for short-circuit.
OK
E
NG
Repair harness or connec-
tors.
CHECK INPUT SIGNAL CIRCUIT.
Check harness continuity between mass air
flow sensor connector terminal
p
4
and
ECM connector terminal
223
, mass air
flow sensor connector terminal
p
5
and
ECM connector terminal
224
.
Continuity should exist.
If OK, check harness for short.
OK
E
NG
Repair harness or connec-
tors.
CHECK COMPONENT
(Mass air flow sensor).
Refer to “COMPONENT INSPECTION” on
next page.
OK
E
NG
Replace mass air flow sen-
sor.
Disconnect and reconnect harness connec-
tors in the circuits. Then retest.
Trouble is not fixed.
Check ECM pin terminals for damage or the
connection of ECM harness connector.
INSPECTION END
NEF788
Mass air flow sensor harness connector
NEF789
Mass air flow
sensor connector
NEF191A
Mass air
flow sensor
connector
NEF192A
Mass air flow sensor
connector
H
H
H
H
H
H
H
TROUBLE DIAGNOSIS 1
CD20T
Mass Air Flow Sensor (MAFS) (Cont’d)
EC-64
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