Ec-500 NISSAN ALMERA N16 2003 Electronic Repair Manual

EC-500
[QG (WITHOUT EURO-OBD)]
DTC P0102, P0103 MAF SENSOR
7. CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between MAF sensor terminal 1 and ECM terminal 50.
Refer to Wiring Diagram.
2. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 8.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
8. CHECK MASS AIR FLOW SENSOR
Refer to EC-500, "
Component Inspection" .
OK or NG
OK >> GO TO 9.
NG >> Replace mass air flow sensor.
9. CHECK INTERMITTENT INCIDENT
Refer to EC-485, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionEBS00KFN
MASS AIR FLOW SENSOR
1. Reconnect harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
3. Check voltage between ECM terminal 50 (Mass air flow sensor
signal) and ground.
*: Check for liner voltage rise in response to engine being increased to about
4,000 rpm.
4. If the voltage is out of specification, proceed the following.
a. Turn ignition switch “OFF”.
b. Disconnect mass air flow sensor harness connector and reconnect it again.
c. Perform steps 2 and 3 again.
5. If NG, remove mass air flow sensor from air duct. Check hot film for damage or dust.
6. If NG, clean or replace mass air flow sensor.
Removal and InstallationEBS00KFO
MASS AIR FLOW SENSOR
Refer to EM-14, "AIR CLEANER AND AIR DUCT" . Continuity should exist.
Condition Voltage V
Ignition switch “ON” (Engine stopped.) Approx. 1.0
Idle (Engine is warmed-up to normal operating
temperature.)1.0 - 1.7
2,500 rpm (Engine is warmed-up to normal
operating temperature.)1.5 - 2.1
Idle to about 4,000 rpm* 1.0 - 1.7 to Approx. 4.0
MBIB0017E

HO2S1
EC-651
[QG (WITHOUT EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
MA
EC
8.CHECK HO2S1 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect HO2S1 harness connector.
3. Disconnect ECM harness connector.
4. Check harness continuity between ECM terminal 74 and HO2S1
terminal 3. Refer to Wiring Diagram.
5. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 9.
NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
9.CHECK HO2S1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 35 and HO2S1 terminal 2.
Refer to Wiring Diagram.
2. Check harness continuity between ECM terminal 35 or HO2S1 terminal 2 and ground.
Refer to Wiring Diagram.
3. Also check harness for short to power.
OK or NG
OK >> GO TO 10.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
10.CHECK HEATED OXYGEN SENSOR 1 HEATER
Refer to EC-637, "
Component Inspection" .
OK or NG
OK >> GO TO 11.
NG >> Replace malfunctioning heated oxygen sensor 1.
11 . CHECK MASS AIR FLOW SENSOR
Refer to EC-500, "
Component Inspection" .
OK or NG
OK >> GO TO 12.
NG >> Replace mass air flow sensor.
12.CHECK PCV VALVE
Refer to EC-720, "
Component Inspection" .
OK or NG
OK >> GO TO 13.
NG >> Replace PCV valve.
13.CHECK HEATED OXYGEN SENSOR 1
Refer to EC-652, "
Component Inspection" .
OK or NG
OK >> GO TO 14.
NG >> Replace malfunctioning heated oxygen sensor 1.Continuity should exist.
MBIB0091E
Continuity should exist.
Continuity should not exist.