2001 NISSAN ALMERA N16 Electronic Repair Manual

Page 441 of 2493

NISSAN ALMERA N16 2001  Electronic Repair Manual Main Power Supply and Ground Circuit
WIRING DIAGRAMNJEC0047
YEC962
TROUBLE DIAGNOSIS FOR POWER SUPPLYQG
Main Power Supply and Ground Circuit
EC-145

Page 442 of 2493

NISSAN ALMERA N16 2001  Electronic Repair Manual ECM TERMINALS AND REFERENCE VALUENJEC0048Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output

Page 443 of 2493

NISSAN ALMERA N16 2001  Electronic Repair Manual 2 CHECK ECM POWER SUPPLY CIRCUIT-I
1. Turn ignition switch ªOFFº and then ªONº.
2. Check voltage between ECM terminal 43 and ground with CONSULT-II or tester.
SEF291X
OK or NG
OK©GO TO 4.
NG©GO

Page 444 of 2493

NISSAN ALMERA N16 2001  Electronic Repair Manual 5 CHECK POWER SUPPLY-II
1. Disconnect ECM relay. (For ECM relay location, refer to ªEngine Control Compartment Parts Locationº.)
2. Check voltage between ECM relay terminals 1, 6 and ground with CON

Page 445 of 2493

NISSAN ALMERA N16 2001  Electronic Repair Manual 9 CHECK ECM POWER SUPPLY CIRCUIT-II
1. Stop engine.
2. Check voltage between ECM terminal 67 and ground with CONSULT-II or tester.
SEF293X
OK or NG
OK©GO TO 11.
NG©GO TO 10.
10 DETECT MALFUNCTIONING

Page 446 of 2493

NISSAN ALMERA N16 2001  Electronic Repair Manual 12 CHECK ECM POWER SUPPLY CIRCUIT-IV
1. Disconnect ECM relay. (For ECM relay location, refer to ªEngine Control Compartment Parts Locationº.)
2. Check voltage between ECM relay terminal 5 and ground

Page 447 of 2493

NISSAN ALMERA N16 2001  Electronic Repair Manual 16 CHECK ECM RELAY
1. Apply 12V direct current between ECM relay terminals 1 and 2.
2. Check continuity between relay terminals 3 and 5, 6 and 7.
SEF296X
OK or NG
OK©GO TO 17.
NG©Replace ECM relay.

Page 448 of 2493

NISSAN ALMERA N16 2001  Electronic Repair Manual SEF987W
Component DescriptionNJEC0050The mass air flow sensor is placed in the stream of intake air. It
measures the intake flow rate by measuring a part of the entire
intake flow. It consists of a ho