2005 NISSAN X-TRAIL heater

TROUBLE DIAGNOSIS
EC-605
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ENGINE CONTROL COMPONENT PARTS/CONTROL SYSTEMS APPLICATION
X: Applicable
*1: This item includes 1st trip DTCs.ItemDIAGNOSTIC TEST MODE
WORK
SUPPORTSELF-DIAGNOSTIC
RESULTS
DATA
MONI-
TORDATA
MONITOR
(SPEC)ACTIVE
TEST DTC*
1FREEZE
FRAME
DATA*
2
ENGINE CONTROL COMPONENT PARTS
INPUT
Crankshaft position sensor (POS)××××
Camshaft position sensor (PHASE)×××
Mass air flow sensor×××
Engine coolant temperature sensor×××××
Heated oxygen sensor 1×××
Heated oxygen sensor 2××
Vehicle speed signal××××
Accelerator pedal position sensor×××
Throttle position sensor×××
Intake air temperature sensor××
Knock sensor×
Refrigerant pressure sensor××
Closed throttle position switch (accelerator
pedal position sensor signal)××
Air conditioner switch××
Park/neutral position (PNP) switch×××
Stop lamp switch×××
Power steering pressure sensor×××
Battery voltage××
Electrical load signal××
ASCD steering switch*
3×××
ASCD brake switch*
3×××
ASCD clutch switch*
3×××
ENGINE CONTROL COMPONENT PARTS
OUTPUT
Fuel injectors×××
Power transistor (Ignition timing)×××
Throttle control motor relay×××
Throttle control motor×
EVAP canister purge volume control sole-
noid valve×××
Air conditioner relay××
Fuel pump relay××××
Cooling fan relay××××
Heated oxygen sensor 1 heater××
Heated oxygen sensor 2 heater××
Intake valve timing control solenoid valve××××
VIAS control solenoid valve*
3×××

TROUBLE DIAGNOSIS
EC-609
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START SIGNAL
[ON/OFF]××
Indicates start signal status [ON/OFF] com-
puted by the ECM according to the signals of
engine speed and battery voltage.
After starting the engine, [OFF] is
displayed regardless of the starter
signal.
CLSD THL POS
[ON/OFF]××

Indicates idle position [ON/OFF] computed by
ECM according to the accelerator pedal posi-
tion sensor signal.
AIR COND SIG
[ON/OFF]××

Indicates [ON/OFF] condition of the air condi-
tioner switch as determined by the air condi-
tioner signal.
P/N POSI SW
[ON/OFF]××

Indicates [ON/OFF] condition from the park/
neutral position (PNP) switch signal.
PW/ST SIGNAL
[ON/OFF]××

[ON/OFF] condition of the power steering
pressure sensor as determined by the power
steering pressure sensor signal is indicated.
LOAD SIGNAL
[ON/OFF]××

Indicates [ON/OFF] condition from the electri-
cal load signal.
ON: Rear window defogger switch is ON and/
or lighting switch is in 2nd position (placed in
LOW position for models with Xenon head-
lamp).
OFF: Both rear window defogger switch and
lighting switch are OFF.
IGNITION SW
[ON/OFF]×

Indicates [ON/OFF] condition from ignition
switch.
HEATER FAN SW
[ON/OFF]×

Indicates [ON/OFF] condition from the heater
fan switch signal.
BRAKE SW
[ON/OFF]×

Indicates [ON/OFF] condition from the stop
lamp switch signal.
INJ PULSE-B1
[msec]×

Indicates the actual fuel injection pulse width
compensated by ECM according to the input
signals.
When the engine is stopped, a
certain computed value is indi-
cated.
IGN TIMING [BTDC]×

Indicates the ignition timing computed by ECM
according to the input signals.
When the engine is stopped, a
certain value is indicated.
PURG VOL C/V [%]

Indicates the EVAP canister purge volume
control solenoid valve control value computed
by the ECM according to the input signals.

The opening becomes larger as the value
increases.
INT/V TIM (B1)
[°CA]

Indicates [°CA] of intake camshaft advanced
angle.
INT/V SOL (B1) [%]

The control value of the intake valve timing
control solenoid valve (determined by ECM
according to the input signal) is indicated.

The advance angle becomes larger as the
value increases
VIAS S/V*
[ON/OFF]

The control condition of the VIAS control sole-
noid valve (determined by ECM according to
the input signals) is indicated.
ON: VIAS control solenoid valve is operating.
OFF: VIAS control solenoid valve is not oper-
ating.
AIR COND RLY
[ON/OFF]×

The air conditioner relay control condition
(determined by ECM according to the input
signals) is indicated. Monitored item [Unit]ECM
INPUT
SIGNALSMAIN
SIG-
NALSDescription Remarks

EC-610
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TROUBLE DIAGNOSIS

FUEL PUMP RLY
[ON/OFF]×
Indicates the fuel pump relay control condition
determined by ECM according to the input sig-
nals.
THRTL RELAY
[ON/OFF]×

Indicates the throttle control motor relay con-
trol condition determined by the ECM accord-
ing to the input signals.
COOLING FAN
[HI/LOW/OFF]

Indicates the condition of the cooling fan
(determined by ECM according to the input
signals).
HI: High speed operation
LOW: Low speed operation
OFF: Stop
HO2S1 HTR (B1)
[ON/OFF]

Indicates [ON/OFF] condition of heated oxy-
gen sensor 1 heater determined by ECM
according to the input signals.
HO2S2 HTR (B1)
[ON/OFF]

Indicates [ON/OFF] condition of heated oxy-
gen sensor 2 heater determined by ECM
according to the input signals.
IDL A/V LEARN
[YET/CMPLT]

Display the condition of Idle Air Volume Learn-
ing
YET: Idle Air Volume Learning has not been
performed yet.
CMPLT: Idle Air Volume Learning has already
been performed successfully.
AC PRESS SEN [V]

The signal voltage from the refrigerant pres-
sure sensor is displayed.
VHCL SPEED SE*
[km/h] or [mph]

The vehicle speed computed from the vehicle
speed signal sent from TCM is displayed.
SET VHCL SPD*
[km/h] or [mph]

The preset vehicle speed is displayed.
MAIN SW*
[ON/OFF]

Indicates [ON/OFF] condition from MAIN
switch signal.
CANCEL SW*
[ON/OFF]

Indicates [ON/OFF] condition from CANCEL
switch signal.
RESUME/ACC SW*
[ON/OFF]

Indicates [ON/OFF] condition from RESUME/
ACCELERATE switch signal.
SET SW*
[ON/OFF]

Indicates [ON/OFF] condition from SET/
COAST switch signal.
BRAKE SW1*
[ON/OFF]

Indicates [ON/OFF] condition from ASCD
brake switch signal.
BRAKE SW2*
[ON/OFF]

Indicates [ON/OFF] condition of stop lamp
switch signal.
VHCL SPD CUT*
[NON/CUT]

Indicates the vehicle cruise condition.
NON: Vehicle speed is maintained at the
ASCD set speed.
CUT: Vehicle speed increased to excessively
high compared with the ASCD set speed, and
ASCD operation is cut off.
LO SPEED CUT*
[NON/CUT]

Indicates the vehicle cruise condition.
NON: Vehicle speed is maintained at the
ASCD set speed.
CUT: Vehicle speed decreased to excessively
low compared with the ASCD set speed, and
ASCD operation is cut off. Monitored item [Unit]ECM
INPUT
SIGNALSMAIN
SIG-
NALSDescription Remarks

EC-616
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TROUBLE DIAGNOSIS

LOAD SIGNAL
Ignition switch: ONRear window defogger switch is ON
and/or lighting switch is in 2nd
(placed in LOW position for models
with Xenon headlamp).ON
Rear window defogger switch is
OFF and lighting switch is OFF.OFF
IGNITION SW

Ignition switch: ON → OFF → ON ON → OFF → ON
HEATER FAN SW

Ignition switch: ONHeater fan is operating. ON
Heater fan is not operating OFF
BRAKE SW

Ignition switch: ONBrake pedal: Fully released OFF
Brake pedal: Slightly depressed ON
INJ PULSE-B1

Engine: After warming up

Air conditioner switch: OFF

Shift lever: P or N (A/T), Neutral
(M/T)

No loadIdle 2.0 - 3.0 msec
2,000 rpm 1.9 - 2.9 msec
IGN TIMING

Engine: After warming up

Air conditioner switch: OFF

Shift lever: P or N (A/T), Neutral
(M/T)

No loadIdle 13° - 17° BTDC
2,000 rpm 25° - 45° BTDC
PURG VOL C/V

Engine: After warming up

Air conditioner switch: OFF

Shift lever: P or N (A/T), Neutral
(M/T)

No loadIdle 0%
2,000 rpm 20 - 30%
INT/V TIM (B1)

Engine: After warming up

Air conditioner switch: OFF

Shift lever: P or N (A/T), Neutral
(M/T)

No loadIdle−5° - 5°CA
2,000 rpm Approx. 0° - 20°CA
INT/V SOL (B1)

Engine: After warming up

Air conditioner switch: OFF

Shift lever: P or N (A/T), Neutral
(M/T)

No loadIdle 0% - 2%
2,000 rpm Approx. 0% - 50%
VIAS S/V*
2
Engine: After warming upIdle OFF
More than 5,000 rpm ON
AIR COND RLY

Engine: After warming up, idle
the engineAir conditioner switch: OFF OFF
Air conditioner switch: ON
(Compressor operates)ON
FUEL PUMP RLY

For 1 second after turning ignition switch ON

Engine running or crankingON

Except above conditions OFF
THRTL RELAY

Ignition switch: ON ON MONITOR ITEM CONDITION SPECIFICATION

EC-846
[QR (WITHOUT EURO-OBD)]
HO2S1 HEATER

HO2S1 HEATERPFP:22690
DescriptionEBS01134
SYSTEM DESCRIPTION
The ECM performs ON/OFF duty control of the heated oxygen sensor 1 heater corresponding to the engine
speed and engine coolant temperature. The duty percent varies with engine coolant temperature when engine
is started.
OPERATION
CONSULT-II Reference Value in Data Monitor ModeEBS01135
Specification data are reference values.
Sensor Input Signal to ECM ECM function Actuator
Camshaft position sensor (PHASE)
Crankshaft position sensor (POS)Engine speed
Heated oxygen sensor 1
heater controlHeated oxygen sensor 1
heater
Engine coolant temperature sensor Engine coolant temperature
Engine speed rpm Heated oxygen sensor 1 heater
Above 3,600 OFF
Below 3,600 ON
MONITOR ITEM CONDITION SPECIFICATION
HO2S1 HTR (B1)

Engine: After warming up

Engine speed: Below 3,600 rpmON

Engine speed: Above 3,600 rpm OFF

HO2S1 HEATER
EC-847
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Wiring DiagramEBS01136
TBWA0643E

EC-848
[QR (WITHOUT EURO-OBD)]
HO2S1 HEATER

Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
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.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic ProcedureEBS01137
1. CHECK OVERALL FUNCTION
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Set tester prove between ECM terminal 24 (HO2S1 heater signal) and ground.
5. Start engine and let it idle.
6. Check the voltage under the following conditions.
Verify that the oscilloscope screen shows the signal waves as
shown below.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
OK or NG
OK >>INSPECTION END
NG >> GO TO 2.
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
24 G/WHeated oxygen sen-
sor 1 heater[Engine is running]

Warm-up condition.

Engine speed is below 3,600 rpmApproximately 7.0V
[Engine is running]

Engine speed is above 3,600 rpmBATTERY VOLTAGE
(11 - 14V)
PBIB0519E
Conditions Voltage
At idleApproximately 7.0V
Engine speed is above 3,600 rpm.BATTERY VOLTAGE
(11 - 14V)
MBIB0038EPBIB0519E

HO2S1 HEATER
EC-849
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2. CHECK HO2S1 POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect heated oxygen sensor 1 harness connector.
3. Turn ignition switch ON.
4. Check voltage between HO2S1 terminal 4 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 E60, F36

Fuse block (J/B) connector E103

10A fuse

Harness for open or short between heated oxygen sensor 1 and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK HO2S1 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between HO2S1 terminal 1 and ECM terminal 24.
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 HEATED OXYGEN SENSOR 1 HEATER
Refer to EC-850, "
Component Inspection" .
OK or NG
OK >> GO TO 6.
NG >> Replace heated oxygen sensor 1.
PBIB0500E
Voltage: Battery voltage
PBIB0541E
Continuity should exist.