NISSAN X-TRAIL 2003 Service Repair Manual

TROUBLE DIAGNOSIS
MTC-3
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MTC

TROUBLE DIAGNOSISPFP:00004
How to Perform Trouble Diagnoses for Quick and Accurate RepairEJS001FB
WORK FLOW
SYMPTOM TABLE
*1MTC-7, "Operational Check".
SHA900E
Symptom Reference Page
Air outlet does not change. Go to Trouble Diagnosis Procedure for Mode Door.MTC-9, "
Mode
Door"
Discharge air temperature does not change. Go to Trouble Diagnosis Procedure Air Mix Door.MTC-10, "Air Mix
Door"
Intake door does not change.
Go to Trouble Diagnosis Procedure for Intake Door Motor Circuit.MTC-11, "Intake
Door Motor Cir-
cuit"Intake door motor does not operate normally.
Blower motor operation is malfunctioning. Go to Trouble Diagnosis Procedure for Blower Motor Circuit.MTC-15, "
Blower
Motor Circuit"
Insufficient heating Go to Trouble Diagnosis Procedure for Insufficient Heating.MTC-19, "Insuffi-
cient Heating"

MTC-4
TROUBLE DIAGNOSIS

Component Parts and Harness Connector LocationEJS001FC
PASSENGER COMPARTMENT
RJIA2845E

TROUBLE DIAGNOSIS
MTC-5
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MTC

Discharge Air FlowEJS001HF
SJIA0441E

MTC-6
TROUBLE DIAGNOSIS

Wiring Diagram —HEATER—EJS001FD
TJWA0076E

TROUBLE DIAGNOSIS
MTC-7
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MTC

Operational CheckEJS001FE
The purpose of the operational check is to confirm that the system operates properly.
CHECKING BLOWER
1. Turn fan switch to 1st-speed. Blower should operate on low
speed.
2. Then turn fan switch to 2nd-speed, and continue checking
blower speed until all speeds are checked.
3. Leave blower on Max. speed.
If NG, go to trouble diagnosis procedure for MTC-15, "
Blower Motor
Circuit" .
If OK, continue with the check.
CHECKING DISCHARGE AIR
1. Turn mode control dial to each position.
2. Confirm that discharge air comes out according to the air distri-
bution table. Refer to MTC-5, "
Discharge Air Flow" .
If NG, go to trouble diagnosis procedure for MTC-9, "
Mode Door" .
If OK, continue the check.
CHECKING RECIRCULATION
1. Press REC switch. Recirculation indicator should eliminate.
2. Press REC switch again. Recirculation indicator should not illu-
minate.
3. Listen for intake door position change (you should hear blower
sound change slightly).
If NG, go to trouble diagnosis procedure for MTC-11, "
Intake Door
Motor Circuit" .
If OK, continue the check.Conditions :Engine running at usual operating temperature
RJIA0587E
RJIA0588E
RJIA0492E
RJIA0589E

MTC-8
TROUBLE DIAGNOSIS

CHECKING TEMPERATURE DECREASE
1. Turn temperature control dial to full cold position.
2. Check for cold air at discharge air outlets.
If NG, go to trouble diagnosis procedure for MTC-10, "
Air Mix Door"
If OK, continue the check.
CHECKING TEMPERATURE INCREASE
1. Turn temperature control dial to full hot position.
2. Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for MTC-19, "
Insufficient
Heating" .
If all operational check are OK (symptom cannot be duplicated), go
to Incident Simulation Tests in GI-23, "
How to Perform Efficient Diag-
nosis for an Electrical Incident" and perform tests as outlined to sim-
ulate driving conditions environment. If symptom appears, refer to
MTC-3, "
SYMPTOM TABLE" and perform applicable trouble diagno-
sis procedures.
RJIA0590E
RJIA0591E

TROUBLE DIAGNOSIS
MTC-9
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MTC

Mode DoorEJS001FF
SYMPTOM: Air outlet does not change.
INSPECTION FLOW
*1MTC-5, "Discharge Air Flow".*2MTC-7, "Operational Check".*3MTC-31, "MODE DOOR".
*4MTC-3, "
SYMPTOM TABLE".
RJIA0592E

MTC-10
TROUBLE DIAGNOSIS

Air Mix DoorEJS001FG
SYMPTOM: Air mix door does not change.
INSPECTION FLOW
*1MTC-32, "AIR MIX DOOR".*2MTC-3, "SYMPTOM TABLE".*3MTC-7, "Operational Check".
RJIA0593E

TROUBLE DIAGNOSIS
MTC-11
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MTC

Intake Door Motor CircuitEJS004HC
SYMPTOM:

Intake door does not change.

Intake door motor does not operate normally.
INSPECTION FLOW
COMPONENT DESCRIPTION
Intake Door Motor
The intake door motor is attached to the intake unit. It rotates so that
air is drawn from inlets set by the heater control panel. Motor rotation
is conveyed to a lever which activates the intake door.
*1MTC-11, "Intake Door Motor Circuit".*2MTC-7, "Operational Check".*3MTC-3, "SYMPTOM TABLE".
RJIA0594E
RJIA0519E

MTC-12
TROUBLE DIAGNOSIS

DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR
SYMPTOM: Intake door does not operate normally.
1. CHECK POWER SUPPLY FOR HEATER CONTROL PANEL
1. Disconnect heater control panel connector.
2. Turn ignition switch ON.
3. Check voltage between heater control panel harness connector
M55 terminal 1 (BR/Y) and ground.
OK or NG
OK >> GO TO 2.
NG >> Check power supply circuit and 10 A fuse [No. 15,
located in the fuse block (J/B)]. Refer to PG-75, "
FUSE
BLOCK - JUNCTION BOX (J/B)" .

If OK, check harness for open circuit. Repair or replace if necessary.

If NG, replace fuse and check harness for short circuit. Repair or replace if necessary.
2. CHECK GROUND CIRCUIT FOR HEATER CONTROL PANEL
1. Turn ignition switch OFF.
2. Check continuity between heater control panel harness connec-
tor M55 terminal 5 (B) and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
3. CHECK RECIRCULATION SWITCH CIRCUIT
1. Press REC (recirculation) switch.
2. Check continuity between heater control panel harness connec-
tor M55 terminal 1 (BR/Y) and 5 (B).
OK or NG
OK >> GO TO 4.
NG >> Replace heater control panel.
RJIA2846E
1 – Ground : Battery voltage
RJIA2923E
5 – Ground : Continuity should exist.
RJIA2924E
1 (−) – 5 (+) : Continuity should exist.
RJIA2925E