2001 NISSAN ALMERA TINO Service Repair Manual

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Page 1097 of 3051

NISSAN ALMERA TINO 2001 Service Repair Manual WIRING DIAGRAM (MODELS WITH ECM IN CABIN)NLEC1931
YEC911
TROUBLE DIAGNOSIS FOR POWER SUPPLYSR20DE
Main Power Supply and Ground Circuit (Contd)
EC-672

Page 1098 of 3051

NISSAN ALMERA TINO 2001 Service Repair Manual ECM TERMINALS AND REFERENCE VALUENLEC1379Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output

Page 1099 of 3051

NISSAN ALMERA TINO 2001 Service 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 1100 of 3051

NISSAN ALMERA TINO 2001 Service Repair Manual 6 CHECK POWER SUPPLY-II
1. Disconnect ECM relay.
(For ECM relay location, refer to ªEngine Control Component Parts Locationº.)
2. Check voltage between ECM relay terminals 1, 6 and ground with CONSU

Page 1101 of 3051

NISSAN ALMERA TINO 2001 Service 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 1102 of 3051

NISSAN ALMERA TINO 2001 Service Repair Manual 12 CHECK ECM POWER SUPPLY CIRCUIT-IV
1. Disconnect ECM relay.
(For ECM relay location, refer to ªEngine Control Component Parts Locationº.)
2. Check voltage between ECM relay terminal 3 and ground w

Page 1103 of 3051

NISSAN ALMERA TINO 2001 Service 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 1104 of 3051

NISSAN ALMERA TINO 2001 Service Repair Manual SEF987W
Component DescriptionNLEC1381The 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

SEF987W
Component DescriptionNLEC1381The 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 hot wire that is supplied with electric
current from the ECM. The temperature of the hot wire is controlled
by the ECM a certain amount. The heat generated by the hot wire
is reduced as the intake air flows around it. The more air, the
greater the heat loss.
Therefore, the ECM must supply more electric current to maintain
the temperature of the hot wire as air flow increases. The ECM
detects the air flow by means of this current change.
CONSULT-II Reference Value in Data Monitor
Mode
NLEC1382Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
MAS A/F SE-B1+Engine: After warming up
+Air conditioner switch: ªOFFº
+Shift lever: ªNº
+No-loadIdle 1.0 - 1.7V
2,500 rpm 1.5 - 2.1V
MASS AIRFLOW+Engine: After warming up
+Air conditioner switch: ªOFFº
+Shift lever: ªNº
+No-loadIdle 2.5 - 5.0 g´m/s
2,500 rpm 7.1 - 12.5 g´m/s
ECM Terminals and Reference ValueNLEC1383Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
61 G Mass air flow sensor[Engine is running]
+Warm-up condition
+Idle speed1.3 - 1.7V
[Engine is running]
+Warm-up condition
+Engine speed is 2,500 rpm1.8 - 2.4V
73 BMass air flow sensor
ground[Engine is running]
+Warm-up condition
+Idle speedApproximately 0V
On Board Diagnosis LogicNLEC1384
DTC No. Malfunction is detected when ... Check Items (Possible Cause)
P0100
0100A) An excessively high voltage from the sensor is sent
to ECM when engine is not running.+Harness or connectors
(The sensor circuit is open or shorted.)
+Mass air flow sensor
B) An excessively low voltage from the sensor is sent
to ECM* when engine is running.+Harness or connectors
(The sensor circuit is open or shorted.)
+Intake air leaks
+Mass air flow sensor
*: When this malfunction is detected, the ECM enters fail-safe mode and the MI lights up.
DTC P0100 MASS AIR FLOW SENSOR (MAFS)SR20DE
Component Description
EC-679

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