NISSAN X-TRAIL 2001 Service Repair Manual

DTC P1621 ECM RELAY
EC-1541
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4.CHECK ECM OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminals D24, D26 and ECM relay terminal 2. Refer to Wiring
Diagram.
2. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 6.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
5.CHECK ECM RELAY
Refer to EC-1541, "
Component Inspection" .
OK or NG
OK >> GO TO 6.
NG >> Replace ECM relay.
6.CHECK INTERMITTENT INCIDENT
Refer to EC-1441, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionEBS008ZD
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 exist.
Condition Continuity
12V direct current supply between ter-
minals 1 and 2Ye s
OFF No
PBIB0077E

EC-1542
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DTC P1660 BATTERY VOLTAGE
DTC P1660 BATTERY VOLTAGE
PFP:AYBGL
On Board Diagnosis LogicEBS0035A
The ECM checks if battery voltage is within the tolerance range for the engine control system.
DTC Confirmation ProcedureEBS0035B
With CONSULT-II
1. Check the following.
–Jumper cables are connected for jump starting.
–Battery or alternator has been replaced.
If the result is “Yes” for one item or more, skip the following steps and go to EC-1542, "
Diagnostic Proce-
dure" .
2. Check that the positive battery terminal is connected to battery properly. If NG, reconnect it properly.
3. Check that the alternator functions properly. Refer to SC-12, "
CHARGING SYSTEM" .
4. Turn ignition switch “ON” and select “DATA MONITOR” mode with CONSULT-II.
5. Wait one minute.
6. If DTC is detected, go to EC-1542, "
Diagnostic Procedure" .
If DTC is not detected, go to next step.
7. Start engine and wait one minute at idle.
8. If DTC is detected, go to EC-1542, "
Diagnostic Procedure" .
Diagnostic ProcedureEBS0035C
1. INSPECTION START
Are jumper cables connected for the jump starting?
Ye s o r N o
Yes >> GO TO 3.
No >> GO TO 2.
2. CHECK BATTERY AND ALTERNATOR
Check that the proper type of battery and alternator is installed.
Refer to SC-3, "
BATTERY" , SC-12, "CHARGING SYSTEM" .
OK or NG
OK >> GO TO 5.
NG >> Replace with a proper one.
DTC Malfunction is detected when ... Check Items (Possible Cause)
P1660
●An abnormally high or low voltage from the battery
is sent to ECM.●Incorrect jump starting
●Battery
●Alternator
●ECM

DTC P1660 BATTERY VOLTAGE
EC-1543
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3.CHECK JUMPER CABLES INSTALLATION
Check that the jumper cables are connected in the correct sequence.
OK or NG
OK >> GO TO 4.
NG >> Reconnect jumper cables properly.
4.CHECK BATTERY FOR BOOSTER
Check that the battery for the booster is a 12V battery.
OK or NG
OK >> GO TO 5.
NG >> Change the vehicle for booster.
5.PERFORM DTC CONFIRMATION PROCEDURE AGAIN
Perform EC-1542, "
DTC Confirmation Procedure" , again.
OK or NG
OK >> GO TO 6.
NG >> Replace ECM.
6.CHECK ELECTRICAL PARTS DAMAGE
Check the following for damage.
●Wiring harness and harness connectors for burn
●Fuses for short
OK or NG
OK >>INSPECTION END
NG >> Repair or replace malfunctioning part.
SEF439Z

EC-1544
[YD]
GLOW CONTROL SYSTEM
GLOW CONTROL SYSTEM
PFP:25230
DescriptionEBS0035J
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.
●Starting
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.
ECM Terminals and Reference ValueEBS0035K
Specification 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.
Sensor Input Signal to ECM ECM Function Actuator
Crankshaft position sensor (TDC) Engine speed
Glow controlGlow lamp
Glow relay
Glow plugs Engine coolant temperature sensor Engine coolant temperature
SEF376Y
TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
D2 OR Glow lamp[Ignition switch “ON”]
●Glow lamp is “ON”Approximately 1.0V
[Ignition switch “ON”]
●Glow lamp is “OFF”BATTERY VOLTAGE
(11 - 14V)
E9 W/R Glow relay Refer to EC-1544, "
SYSTEM DESCRIPTION"

GLOW CONTROL SYSTEM
EC-1545
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Wiring DiagramEBS0035L
TBWA0108E

EC-1546
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GLOW CONTROL SYSTEM
Diagnostic Procedure
EBS0035M
1. INSPECTION START
Check fuel level, fuel supplying system, starter motor, etc.
OK or NG
OK >> GO TO 2.
NG >> Correct.
2. CHECK INSTALLATION
Check that glow plug nut and all glow plug connecting plate nuts are
installed properly.
OK or NG
OK >> GO TO 3.
NG >> Install properly.
3. CHECK GLOW INDICATOR LAMP OPERATION
With CONSULT-II
1. Turn ignition switch “ON”.
2. Select “COOLAN TEMP/S” in “DATA MONITOR” mode with
CONSULT-II.
3. Confirm that “COOLAN TEMP/S” indicates below 80°C (176°F).
If it indicates above 80°C (176°F), cool down engine.
4. Turn ignition switch “OFF”, wait at least 5 seconds and then turn
“ON”.
5. Make sure that glow indicator lamp is turned “ON” for 1.5 sec-
onds or more after turning ignition switch “ON”, and then glow
indicator lamp turned “OFF”.
OK or NG
OK >> GO TO 4.
NG >> GO TO 5.
SEF392YA
SEF013Y

GLOW CONTROL SYSTEM
EC-1547
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4.CHECK GLOW CONTROL SYSTEM OVERALL FUNCTION
1. Select “COOLAN TEMP/S” in “DATA MONITOR” mode with
CONSULT-II.
2. Confirm that “COOLAN TEMP/S” indicates approximately 25°C
(77°F). If NG, cool down engine.
3. Turn ignition switch “OFF”.
4. Set voltmeter probe between glow plug and engine body.
5. Turn ignition switch “ON”.
6. Check the voltage between glow plug and engine body under
the following conditions.
OK or NG
OK >>INSPECTION END
NG >> GO TO 10.
5.CHECK GLOW INDICATOR LAMP POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect combination meter harness connector M46.
3. Turn ignition switch “ON”.
4. Check voltage between combination meter terminal 46 (LHD
models) or 59 (RHD models) and ground with CONSULT-II or
tester.
OK or NG
OK >> GO TO 7.
NG >> GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.
●Fuse block (J/B) connector M1
●10A fuse
●Harness for open or short between combination meter and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
SEF013Y
Conditions Voltage
For 20 seconds after turning ignition switch
“ON”Battery voltage
More than 20 seconds after turning ignition
switch “ON” Approx. 0V
PBIB0425E
Voltage: Battery voltage
PBIB1412E

EC-1548
[YD]
GLOW CONTROL SYSTEM
7. CHECK GLOW INDICATOR LAMP OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal D2 and combination meter terminal 65 (LHD models) or
55 (RHD models). Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 9.
NG >> GO TO 8.
8. DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors M63, F30
●Harness for open or short between combination meter and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK COMBINATION METER
Check combination meter and glow indicator lamp. Refer to DI-4, "
COMBINATION METERS (LHD MODELS)"
or DI-24, "COMBINATION METERS (RHD MODELS)" and DI-43, "WARNING LAMPS" .
OK or NG
OK >> GO TO 17.
NG >> Repair or replace combination meter or glow indicator lamp.
10. 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 12.
NG >> GO TO 11.Continuity should exist.
PBIB0373E
Voltage: Battery voltage
PBIB1413E

GLOW CONTROL SYSTEM
EC-1549
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11 . DETECT MALFUNCTIONING PART
Check the following.
●60A fusible link
●Harness for open or short between glow relay and battery
>> Repair harness or connectors.
12.CHECK GLOW RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal E9 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 14.
NG >> GO TO 13.
13.DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors E63, F4
●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.
14.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 15.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
15.CHECK GLOW RELAY
Refer to EC-1550, "
Component Inspection" .
OK or NG
OK >> GO TO 16.
NG >> Replace glow relay.
16.CHECK GLOW PLUG
Refer to EC-1550, "
Component Inspection" .
OK or NG
OK >> GO TO 17.
NG >> Replace glow plug.Continuity should exist.
Continuity should exist.

EC-1550
[YD]
GLOW CONTROL SYSTEM
17. CHECK INTERMITTENT INCIDENT
Refer to EC-1441, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionEBS003PM
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 InstallationEBS008ZE
GLOW PLUG
Refer to EM-138, "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)]
: 17.7 - 22.5 N-m (1.8 - 2.3 kg-m, 13 - 16 ft-lb)
PBIB0429E