User Manual - Page 758

For 2001 XTERRA.

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Diagnostic Procedure
NGEC0594
1 CHECK ECTS POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect engine coolant temperature sensor harness connector.
AEC643A
3. Turn ignition switch ON.
4. Check voltage between ECTS terminal 1 and ground with CONSULT-II or tester.
SEF206W
Voltage: Approximately 5V
OK or NG
OK GO TO 2.
NG Repair open circuit or short to ground or short to power in harness or connectors.
2 CHECK ECTS GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check harness continuity between ECTS terminal 2 and engine ground.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to power.
OK or NG
OK GO TO 4.
NG GO TO 3.
3 DETECT MALFUNCTIONING PART
Check the following.
Harness connectors F28, M58
Joint connector-4
Harness for open or short between ECM and engine coolant temperature sensor
Harness for open or short between TCM (Transmission Control Module) and engine coolant temperature sensor
Repair open circuit or short to power in harness or connectors.
DTC P0115 ENGINE COOLANT TEMPERATURE SENSOR
(ECTS) (CIRCUIT)
VG33E
Diagnostic Procedure
EC-758
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