2001 NISSAN ALMERA N16 Electronic Repair Manual

Page 865 of 2493

NISSAN ALMERA N16 2001  Electronic Repair Manual Diagnostic ProcedureNJEC0648
1 CHECK MAFS POWER SUPPLY CIRCUIT
1. Turn ignition switch ªOFFº.
2. Disconnect mass air flow sensor harness connector.
SEF884Y
3. Turn ignition switch ªONº.
4. Check v

Page 866 of 2493

NISSAN ALMERA N16 2001  Electronic Repair Manual 3 CHECK MAFS GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch ªOFFº.
2. Loosen and retighten engine ground screws.
SEF380Y
3. Check harness continuity between mass air flow sensor terminal

Page 867 of 2493

NISSAN ALMERA N16 2001  Electronic Repair Manual 6 CHECK 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 224 (Mass air flow sens

Page 868 of 2493

NISSAN ALMERA N16 2001  Electronic Repair Manual SEF594K
DescriptionNJEC0649The engine coolant temperature sensor is used to detect the
engine coolant temperature. The sensor modifies a voltage signal
from the ECM. The modified signal returns to the

Page 869 of 2493

NISSAN ALMERA N16 2001  Electronic Repair Manual 3) Perform ªDiagnostic Test Mode II (Self-diagnostic results)º with
ECM.
4) If DTC is detected, go to ªDiagnostic Procedureº, EC-575.
DTC P0115 COOLANT TEMP SENYD
DTC Confirmation Procedure (Cont

Page 870 of 2493

NISSAN ALMERA N16 2001  Electronic Repair Manual Wiring DiagramNJEC0652
YEC011A
DTC P0115 COOLANT TEMP SENYD
Wiring Diagram
EC-574

Page 871 of 2493

NISSAN ALMERA N16 2001  Electronic Repair Manual Diagnostic ProcedureNJEC0653
1 CHECK ECTS POWER SUPPLY CIRCUIT
1. Turn ignition switch ªOFFº.
2. Disconnect engine coolant temperature sensor harness connector.
SEF382Y
3. Turn ignition switch ªON

Page 872 of 2493

NISSAN ALMERA N16 2001  Electronic Repair Manual 4 CHECK ENGINE COOLANT TEMPERATURE SENSOR
1. Remove engine coolant temperature sensor from the engine.
2. Check resistance between ECTS terminals 1 and 2 as shown in the figure.
SEF304X
OK or NG
OK©G