2003 NISSAN TEANA Service Manual

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Page 1705 of 3502

NISSAN TEANA 2003 Service Manual TROUBLE DIAGNOSIS
EC-423
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98 LGAccelerator pedal position
sensor 2[Ignition switch: ON]
Engine: Stopped
Accelerator pedal: Fully released0.28 - 0.48V
[Ignition switc

Page 1706 of 3502

NISSAN TEANA 2003 Service Manual EC-424
[VQ]
TROUBLE DIAGNOSIS

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)108 G/R ASCD brake switch[Ignition switch: ON]
Brake pedal: Slightly depresse

Page 1707 of 3502

NISSAN TEANA 2003 Service Manual TROUBLE DIAGNOSIS
EC-425
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CONSULT-II Function (ENGINE)BBS004YF
FUNCTION
*: The following emission-related diagnostic information is cleared when the ECM memory is erase

Page 1708 of 3502

NISSAN TEANA 2003 Service Manual EC-426
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TROUBLE DIAGNOSIS

ENGINE CONTROL COMPONENT PARTS/CONTROL SYSTEMS APPLICATION
X: Applicable
*1: This item includes 1st trip DTCs.
*2: This mode includes 1st trip freeze frame data or free

Page 1709 of 3502

NISSAN TEANA 2003 Service Manual TROUBLE DIAGNOSIS
EC-427
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INSPECTION PROCEDURE
Refer to GI-34, "CONSULT-II Start Procedure" .
WORK SUPPORT MODE
Work Item
*: This function is not necessary in the usual

TROUBLE DIAGNOSIS
EC-427
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INSPECTION PROCEDURE
Refer to GI-34, "CONSULT-II Start Procedure" .
WORK SUPPORT MODE
Work Item
*: This function is not necessary in the usual service procedure.
SELF-DIAG RESULTS MODE
Self Diagnostic Item
Regarding items of DTC and 1st trip DTC, refer to EC-373, "EMISSION-RELATED DIAGNOSTIC INFORMA-
TION ITEMS" .
Freeze Frame Data and 1st Trip Freeze Frame Data
*: The items are the same as those of 1st trip freeze frame data.WORK ITEM CONDITION USAGE
FUEL PRESSURE RELEASE
FUEL PUMP WILL STOP BY TOUCHING “START” DUR-
ING IDLING.
CRANK A FEW TIMES AFTER ENGINE STALLS.When releasing fuel pressure
from fuel line
IDLE AIR VOL LEARN
THE IDLE AIR VOLUME THAT KEEPS THE ENGINE
WITHIN THE SPECIFIED RANGE IS MEMORIZED IN
ECM.When learning the idle air volume
SELF-LEARNING CONT
THE COEFFICIENT OF SELF-LEARNING CONTROL
MIXTURE RATIO RETURNS TO THE ORIGINAL COEF-
FICIENT.When clearing the coefficient of
self-learning control value
TARGET IDLE RPM ADJ*
IDLE CONDITION When setting target idle speed
TARGET IGN TIM ADJ*
IDLE CONDITION When adjusting target ignition tim-
ing
Freeze frame data
item*Description
DIAG TROUBLE
CODE
[PXXXX]
The engine control component part/control system has a trouble code, it is displayed as “PXXXX”. (Refer
to EC-347, "
INDEX FOR DTC" .)
FUEL SYS-B1
“Fuel injection system status” at the moment a malfunction is detected is displayed.
One mode in the following is displayed.
“Mode2”: Open loop due to detected system malfunction
“Mode3”: Open loop due to driving conditions (power enrichment, deceleration enleanment)
“Mode4”: Closed loop - using oxygen sensor(s) as feedback for fuel control
“Mode5”: Open loop - has not yet satisfied condition to go to closed loop FUEL SYS-B2
COOLANT TEMP
[°C] or [°F]
The engine coolant temperature at the moment a malfunction is detected is displayed.
L-FUEL TRM-B1 [%]
“Long-term fuel trim” at the moment a malfunction is detected is displayed.
The long-term fuel trim indicates much more gradual feedback compensation to the base fuel schedule
than short-term fuel trim. L-FUEL TRM-B2 [%]
S-FUEL TRM-B1 [%]
“Short-term fuel trim” at the moment a malfunction is detected is displayed.
The short-term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel
schedule. S-FUEL TRM-B2 [%]
ENGINE SPEED
[rpm]
The engine speed at the moment a malfunction is detected is displayed.
VEHICL SPEED
[km/h] or [mph]
The vehicle speed at the moment a malfunction is detected is displayed.
B/FUEL SCHDL
[msec]
The base fuel schedule at the moment a malfunction is detected is displayed.
INT/A TEMP SE
[°C] or [°F]
The intake air temperature at the moment a malfunction is detected is displayed.

Page 1710 of 3502

NISSAN TEANA 2003 Service Manual EC-428
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TROUBLE DIAGNOSIS

DATA MONITOR MODE
Monitored Item
×: Applicable
Monitored item
[Unit]ECM
INPUT
SIGNALSMAIN
SIGNALSDescription Remarks
ENG SPEED [rpm]××
Indicates the engine spee

EC-428
[VQ]
TROUBLE DIAGNOSIS

DATA MONITOR MODE
Monitored Item
×: Applicable
Monitored item
[Unit]ECM
INPUT
SIGNALSMAIN
SIGNALSDescription Remarks
ENG SPEED [rpm]××
Indicates the engine speed computed from
the signal of the crankshaft position sensor
(POS) and camshaft position sensor
(PHASE).Accuracy becomes poor if engine
speed drops below the idle rpm.
If the signal is interrupted while the
engine is running, an abnormal value
may be indicated.
MAS A/F SE-B1 [V]××
The signal voltage of the mass air flow sen-
sor is displayed.When the engine is stopped, a cer-
tain value is indicated.
B/FUEL SCHDL
[msec]×
Base fuel schedule indicates the fuel injec-
tion pulse width programmed into ECM,
prior to any learned on board correction.
A/F ALPHA-B1 [%]×
The mean value of the air-fuel ratio feed-
back correction factor per cycle is indi-
cated.When the engine is stopped, a cer-
tain value is indicated.
This data also includes the data for
the air-fuel ratio learning control. A/F ALPHA-B2 [%]×
COOLAN TEMP/S
[°C] or [°F]××
The engine coolant temperature (deter-
mined by the signal voltage of the engine
coolant temperature sensor) is displayed.
When the engine coolant tempera-
ture sensor is open or short-cir-
cuited, ECM enters fail-safe mode.
The engine coolant temperature
determined by the ECM is displayed.
HO2S1 (B1) [V]××
The signal voltage of the heated oxygen
sensor 1 is displayed.
HO2S1 (B2) [V]×
HO2S2 (B1) [V]×
The signal voltage of the heated oxygen
sensor 2 is displayed.
HO2S2 (B2) [V]×
HO2S1 MNTR (B1)
[RICH/LEAN]××
Display of heated oxygen sensor 1 signal
during air-fuel ratio feedback control:
RICH: means the mixture became “rich”,
and control is being affected toward a
leaner mixture.
LEAN: means the mixture became “lean”,
and control is being affected toward a rich
mixture.After turning ON the ignition switch,
“RICH” is displayed until air-fuel mix-
ture ratio feedback control begins.
When the air-fuel ratio feedback is
clamped, the value just before the
clamping is displayed continuously. HO2S1 MNTR (B2)
[RICH/LEAN]×
HO2S2 MNTR (B1)
[RICH/LEAN]×
Display of heated oxygen sensor 2 signal:
RICH: means the amount of oxygen after
three way catalyst is relatively small.
LEAN: means the amount of oxygen after
three way catalyst is relatively large.
When the engine is stopped, a cer-
tain value is indicated.
HO2S2 MNTR (B2)
[RICH/LEAN]×
VHCL SPEED SE
[km/h] or [mph]××
The vehicle speed computed from the vehi-
cle speed signal sent from combination
meter is displayed.
BATTERY VOLT
[V]××
The power supply voltage of ECM is dis-
played.
ACCEL SEN 1 [V]××
The accelerator pedal position sensor sig-
nal voltage is displayed.ACCEL SEN 2 signal is converted by
ECM internally. Thus, it differs from
ECM terminal voltage signal. ACCEL SEN 2 [V]×
THRTL SEN 1 [V]××
The throttle position sensor signal voltage
is displayed.THRTL SEN 2 signal is converted by
ECM internally. Thus, it differs from
ECM terminal voltage signal. THRTL SEN 2 [V]×
INT/A TEMP SE
[°C] or [°F]××
The intake air temperature (determined by
the signal voltage of the intake air tempera-
ture sensor) is indicated.

Page 1711 of 3502

NISSAN TEANA 2003 Service Manual TROUBLE DIAGNOSIS
EC-429
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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 v

TROUBLE DIAGNOSIS
EC-429
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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
position sensor signal.
AIR COND SIG
[ON/OFF]××
Indicates [ON/OFF] condition of the air
conditioner switch as determined by the air
conditioner 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
system (determined by the signal voltage
of the power steering pressure sensor sig-
nal) is indicated.
LOAD SIGNAL
[ON/OFF]××
Indicates [ON/OFF] condition from the
electrical load signal.
ON: Rear window defogger switch is ON
and/or lighting switch is in 2nd position.
OFF: Both rear window defogger switch
and lighting switch are OFF.
IGNITION SW
[ON/OFF]×
Indicates [ON/OFF] condition from ignition
switch signal.
HEATER FAN SW
[ON/OFF]×
Indicates [ON/OFF] condition from 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 cer-
tain computed value is indicated.
INJ PULSE-B2
[msec]
IGN TIMING
[BTDC]×
Indicates the ignition timing computed by
ECM according to the input signals.When the engine is stopped, a cer-
tain value is indicated.
PURG VOL C/V
[%]
Indicates the EVAP canister purge volume
control solenoid valve control value com-
puted 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 TIM (B2)
[°CA]
INT/V SOL (B1) [%]
The control condition of the intake valve
timing control solenoid valve (determined
by ECM according to the input signals) is
indicated.
The advance angle becomes larger as the
value increases. INT/V SOL (B2) [%]Monitored item
[Unit]ECM
INPUT
SIGNALSMAIN
SIGNALSDescription Remarks

Page 1712 of 3502

NISSAN TEANA 2003 Service Manual EC-430
[VQ]
TROUBLE DIAGNOSIS

VIAS S/V
[ON/OFF]
The control condition of the VIAS control
solenoid valve (determined by ECM
according to the input signals) is indicated.
ON: VIAS control solenoid

EC-430
[VQ]
TROUBLE DIAGNOSIS

VIAS S/V
[ON/OFF]
The control condition of the VIAS control
solenoid valve (determined by ECM
according to the input signals) is indicated.
ON: VIAS control solenoid valve is operat-
ing.
OFF: VIAS control solenoid valve is not
operating.
AIR COND RLY
[ON/OFF]×
The air conditioner relay control condition
(determined by ECM according to the input
signals) is indicated.
ENGINE MOUNT
[IDLE/TRVL]
The control condition of the electronic con-
trolled engine mount (determined by ECM
according to the input signals) is indicated.
IDLE: Idle condition
TRVL: Driving condition
FUEL PUMP RLY
[ON/OFF]×
Indicates the fuel pump relay control condi-
tion determined by ECM according to the
input signals.
THRTL RELAY
[ON/OFF]×
Indicates the throttle control motor relay
control condition determined by the ECM
according to the input signals.
COOLING FAN
[HI/MID/LOW/OFF]
The control condition of the cooling fan
(determined by ECM according to the input
signals) is indicated.
HI: High speed operation
MID: Middle speed operation
LOW: Low speed operation
OFF: Stop
HO2S1 HTR (B1)
[ON/OFF]
Indicates [ON/OFF] condition of heated
oxygen sensor 1 heater determined by
ECM according to the input signals. HO2S1 HTR (B2)
[ON/OFF]
HO2S2 HTR (B1)
[ON/OFF]
Indicates [ON/OFF] condition of heated
oxygen sensor 2 heater determined by
ECM according to the input signals. HO2S2 HTR (B2)
[ON/OFF]
I/P PULLY SPD
[rpm]
Indicates the engine speed computed from
the primary speed sensor signal.
VEHICLE SPEED
[km/h] or [MPH]
Indicates the vehicle speed computed from
the secondary speed sensor signal.
IDL A/V LEARN
[YET/CMPLT]
Display the condition of idle air volume
learning
YET: Idle Air Volume Learning has not
been performed yet.
CMPLT: Idle Air Volume Learning has
already been performed successfully.
O2SEN HTR DTY
[%]
Indicates the heated oxygen sensor 1
heater control value computed by the ECM
according to the input signals.
AC PRESS SEN
[V]
The signal voltage from the refrigerant
pressure sensor is displayed.
VHCL SPEED SE
[km/h] or [mph]
The vehicle speed computed from the vehi-
cle speed signal sent from TCM is dis-
played. Monitored item
[Unit]ECM
INPUT
SIGNALSMAIN
SIGNALSDescription Remarks

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