2003 NISSAN X-TRAIL relay

EC-1400
[YD (WITHOUT EURO-OBD)]
DTC P0686 ECM RELAY

Wiring DiagramEBS01236
TBWA0576E

DTC P0686 ECM RELAY
EC-1401
[YD (WITHOUT EURO-OBD)]
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Diagnostic ProcedureEBS01237
1. CHECK ECM OUTPUT SIGNAL CIRCUIT FOR SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminals 105, 113 and ground.
Refer to Wiring Diagram.
OK or NG
OK >> GO TO 2.
NG >> Repair short to ground in harness or connectors.
2. CHECK ECM INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM relay.
2. Check harness continuity between ECM terminal 119 and ECM
relay terminal 5, ECM terminals 120 and ECM relay terminal 7.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 3.
NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
3. CHECK ECM RELAY
Refer to EC-1401, "
Component Inspection" .
OK or NG
OK >> GO TO 4.
NG >> Replace ECM relay.
4. CHECK INTERMITTENT INCIDENT
Refer to EC-1260, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionEBS01238
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.
3. If NG, replace ECM relay.Continuity should not exist.
Continuity should exist.
PBIB1899E
Condition Continuity
12V direct current supply between ter-
minals 1 and 2Ye s
OFF No
PBIB0077E

GLOW CONTROL SYSTEM
EC-1457
[YD (WITHOUT EURO-OBD)]
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GLOW CONTROL SYSTEMPFP:25230
DescriptionEBS0125H
SYSTEM DESCRIPTION
When engine coolant temperature is more than approximately 80°C (176°F), the glow relay turns off.
When coolant temperature is lower than approximately 80°C (176°F):

Ignition switch ON
After ignition switch has turned to ON, the glow relay turns ON for a certain period of time in relation to
engine coolant temperature, allowing current to flow through glow plug.

Cranking
The glow relay turns ON, allowing current to flow through glow plug.

Sta rti ng
After engine has started, current continues to flow through glow plug (after-glow mode) for a certain period
in relation to engine coolant temperature.
The glow indicator lamp turns ON for a certain period of time in relation to engine coolant temperature at the
time glow relay is turned ON.
COMPONENT DESCRIPTION
Glow Plug
The glow plug is provided with a ceramic heating element to obtain a
high-temperature resistance. It glows in response to a signal sent
from the ECM, allowing current to flow through the glow plug via the
glow relay.
Sensor Input Signal to ECM ECM Function Actuator
Crankshaft position sensor Engine speed
Glow controlGlow lamp
Glow relay
Glow plugs Engine coolant temperature sensor Engine coolant temperature
SEF376Y

EC-1462
[YD (WITHOUT EURO-OBD)]
GLOW CONTROL SYSTEM

7. CHECK GLOW RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect glow relay.
3. Check voltage between glow relay terminals 1, 3 and ground
with CONSULT-II or tester.
OK or NG
OK >> GO TO 9.
NG >> GO TO 8.
8. DETECT MALFUNCTIONING PART
Check the following.

60A fusible link

Harness for open or short between glow relay and battery
>> Repair harness or connectors.
9. CHECK GLOW RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 37 and glow relay terminal 2.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 11.
NG >> GO TO 10.
10. DETECT MALFUNCTIONING PART
Check the following.

Harness connectors E64, F5

Harness for open or short between glow relay and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
MBIB0078E
Voltage: Battery voltage
PBIB1413E
Continuity should exist.

GLOW CONTROL SYSTEM
EC-1463
[YD (WITHOUT EURO-OBD)]
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11 . CHECK HARNESS CONTINUITY BETWEEN GLOW RELAY AND GLOW PLUG FOR OPEN AND
SHORT
1. Disconnect glow plug harness connector.
2. Check harness continuity between glow relay terminal 5 and glow plug harness connector.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 12.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
12. CHECK GLOW RELAY
Refer to EC-1464, "
Component Inspection" .
OK or NG
OK >> GO TO 13.
NG >> Replace glow relay.
13. CHECK GLOW PLUG
Refer to EC-1464, "
Component Inspection" .
OK or NG
OK >> GO TO 14.
NG >> Replace glow plug.
14. CHECK INTERMITTENT INCIDENT
Refer to EC-1260, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END Continuity should exist.

EC-1464
[YD (WITHOUT EURO-OBD)]
GLOW CONTROL SYSTEM

Component InspectionEBS0125K
GLOW RELAY
Check continuity between glow relay terminals 3 and 5 under the fol-
lowing conditions.
Operation takes less than 1 second.
GLOW PLUG
1. Remove glow plug connecting plate.
2. Check glow plug resistance.
NOTE:

Do not bump glow plug heating element. If it is bumped,
replace glow plug with a new one.

If glow plug is dropped from a height of 10 cm (3.94 in) or
higher, replace with a new one.

If glow plug installation hole is contaminated with car-
bon, remove it with a reamer or suitable tool.

Hand-tighten glow plug by turning it two or three times,
then tighten using a tool to specified torque.
Removal and InstallationEBS0125L
GLOW PLUG
Refer to EM-152, "GLOW PLUG" .
Conditions Continuity
12V direct current supply between ter-
minals 1 and 2Ye s
No current supply No
PBIB0428E
Resistance: Approximately 0.8 Ω [at 25°C (77°F)]
: 20.1 N-m (2.1 kg-m, 15 ft-lb)
PBIB0429E

EGR VOLUME CONTROL SYSTEM
EC-1469
[YD (WITHOUT EURO-OBD)]
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3. DETECT MALFUNCTIONING PART
Check the following.

Harness connectors F30, M63

Harness for open or short between EGR volume control valve and ECM

Harness for open or short between EGR volume control valve and ECM relay
>> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK EGR VOLUME CONTROL VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminals and EGR volume control valve terminals as follows.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 5.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK EGR VOLUME CONTROL VALVE
Refer to EC-1469, "
Component Inspection" .
OK or NG
OK >> GO TO 6.
NG >> Replace EGR volume control valve.
6. CHECK EGR PASSAGE
Check the following for clogging and cracks.

EGR tube

EGR hose

EGR cooler
OK or NG
OK >> GO TO 7.
NG >> Repair or replace EGR passage.
7. CHECK INTERMITTENT INCIDENT
Refer to EC-1260, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionEBS0125R
EGR VOLUME CONTROL VALVE
With CONSULT-II
1. Disconnect EGR volume control valve harness connector.
ECM terminal EGR volume control valve terminal
25 1
26 6
27 3
28 4
Continuity should exist.

TC BOOST CONTROL SOLENOID VALVE
EC-1473
[YD (WITHOUT EURO-OBD)]
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Diagnostic ProcedureEBS0125W
1. CHECK OVERALL FUNCTION
1. Start engine and let it idle.
2. Make sure that turbocharger control actuator rod moves slightly
when engine is started.
OK or NG
OK >>INSPECTION END
NG >> GO TO 2.
2. CHECK TURBOCHARGER BOOST CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT
1. Disconnect turbocharger boost control solenoid valve harness
connector.
2. Turn ignition switch ON.
3. Check voltage between turbocharger boost control solenoid
valve terminals 1 and ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3. DETECT MALFUNCTIONING PART
Check the following.

Harness connectors F30, M63

Harness for open and short between turbocharger boost control solenoid valve and ECM relay

Harness for open and short between turbocharger boost control solenoid valve and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
PBIB1936E
PBIB1897E
Voltage: Battery voltage
PBIB1945E