throttle NISSAN TEANA 2003 Service Manual

BASIC SERVICE PROCEDURE
EC-391
[VQ]
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EC

5. Turn ignition switch OFF and wait at least 10 seconds.
6. Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.
7. Repeat the following procedure quickly five times within 5 seconds.
a. Fully depress the accelerator pedal.
b. Fully release the accelerator pedal.
8. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 20 seconds until the MI stops
blinking and turned ON.
9. Fully release the accelerator pedal within 3 seconds after the MI turned ON.
10. Start engine and let it idle.
11. Wait 20 seconds.
12. Rev up the engine two or three times and make sure that idle speed and ignition timing are within the
specifications.
13. If idle speed and ignition timing are not within the specification, Idle Air Volume Learning will not be carried
out successfully. In this case, find the cause of the incident by referring to the DIAGNOSTIC PROCE-
DURE below.
DIAGNOSTIC PROCEDURE
If idle air volume learning cannot be performed successfully, proceed as follows:
1.Check that throttle valve is fully closed.
2.Check PCV valve operation.
3.Check that downstream of throttle valve is free from air leakage.
4.When the above three items check out OK, engine component parts and their installation condi-
tion are questionable. Check and eliminate the cause of the incident.
It is useful to perform EC-440, "
TROUBLE DIAGNOSIS - SPECIFICATION VALUE" .
5.If any of the following conditions occur after the engine has started, eliminate the cause of the
incident and perform Idle Air Volume Learning all over again:

Engine stalls.

Erroneous idle.
ITEM SPECIFICATION
Idle speed VQ23DE: 700 ± 50 rpm (in P or N position)
VQ35DE: 625 ± 50 rpm (in P or N position)
Ignition timing 15 ± 5° BTDC (in P or N position)
PBIB0665E

EC-400
[VQ]
TROUBLE DIAGNOSIS

DTC Inspection Priority ChartBBS004Y7
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
NOTE:
If DTC U1000 and/or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-458, "
DTC U1000, U1001 CAN COMMUNICATION LINE" .
Priority Detected items (DTC)
1

U1000 U1001 CAN communication line

P0102 P0103 Mass air flow sensor

P0117 P0118 Engine coolant temperature sensor

P0122 P0123 P0222 P0223 P1225 P1226 P2135 Throttle position sensor

P0327 P0328 Knock sensor

P0335 Crankshaft position sensor (POS)

P0340 P0345 Camshaft position sensor (PHASE)

P0605 ECM

P1229 Sensor power supply

P1610 - P1615 NATS

P1700 CVT control system

P1706 Park/Neutral position (PNP) switch

P2122 P2123 P2127 P2128 P2138 Accelerator pedal position sensor
2

P0132 P0134 P0152 P0154 Heated oxygen sensor 1

P0550 Power steering pressure sensor

P1065 ECM power supply

P 1111 P 11 3 6 I n ta k e v a l v e t i m i n g c o n t r o l s o l e n o i d v a l v e

P1122 Electric throttle control function

P1124 P1126 P1128 Electric throttle control actuator

P1217 Engine over temperature (OVERHEAT)

P1720 Vehicle speed sensor

P1805 Brake switch
3

P0011 P0021 Intake valve timing control

P1121 Electric throttle control actuator

P1211 TCS control unit

P1212 TCS communication line

P1564 ASCD steering switch

P1572 ASCD brake switch

P1574 ASCD vehicle speed sensor

P1715 Primary speed sensor

TROUBLE DIAGNOSIS
EC-401
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Fail-Safe ChartBBS004Y8
When the DTC listed below is detected, the ECM enters fail-safe mode and the MI lights up.

When there is an open circuit on MI circuit, the ECM cannot warn the driver by lighting up MI when there
is malfunction on engine control system.
Therefore, when electrical controlled throttle and part of ECM related diagnoses are continuously detected
as NG for 5 trips, ECM warns the driver that engine control system malfunctions and MI circuit is open by
means of operating fail-safe function.
The fail-safe function also operates when above diagnoses except MI circuit are detected and demands
the driver to repair the malfunction.
DTC No. Detected items Engine operating condition in fail-safe mode
P0102
P0103Mass air flow sensor circuit Engine speed will not rise more than 2,400 rpm due to the fuel cut.
P0122
P0123
P0222
P0223
P2135Throttle position sensor The ECM controls the electric throttle control actuator in regulating the throttle opening in
order for the idle position to be within +10 degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal
condition.
So, the acceleration will be poor.
P1121 Electric throttle control
actuator(When electric throttle control actuator does not function properly due to the return spring
malfunction:)
ECM controls the electric throttle actuator by regulating the throttle opening around the
idle position. The engine speed will not rise more than 2,000 rpm.
(When throttle valve opening angle in fail-safe mode is not in specified range:)
ECM controls the electric throttle control actuator by regulating the throttle opening to 20
degrees or less.
(When ECM detects the throttle valve is stuck open:)
While the vehicle is driving, it slows down gradually by fuel cut. After the vehicle stops,
the engine stalls.
The engine can restart in P or N position, and engine speed will not exceed 1,000 rpm or
more.
P1122 Electric throttle control
functionECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P1124
P1126Throttle control motor relay ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P1128 Throttle control motor ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P1229 Sensor power supply ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P1805 Brake switch ECM controls the electric throttle control actuator by regulating the throttle opening to a
small range.
Therefore, acceleration will be poor.
Vehicle condition Driving condition
When engine is idling Normal
When accelerating Poor acceleration
P2122
P2123
P2127
P2128
P2138Accelerator pedal position
sensorThe ECM controls the electric throttle control actuator in regulating the throttle opening in
order for the idle position to be within +10 degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal
condition.
So, the acceleration will be poor.
Engine operating condition in fail-safe mode Engine speed will not rise more than 2,500 rpm due to the fuel cut

EC-402
[VQ]
TROUBLE DIAGNOSIS

Symptom Matrix ChartBBS004Y9
SYSTEM — BASIC ENGINE CONTROL SYSTEM
SYMPTOM
Refer-
ence page
HARD/NO START/RESTART (EXCP. HA)
ENGINE STALL
HESITATION/SURGING/FLAT SPOT
SPARK KNOCK/DETONATION
LACK OF POWER/POOR ACCELERATION
HIGH IDLE/LOW IDLE
ROUGH IDLE/HUNTING
IDLING VIBRATION
SLOW/NO RETURN TO IDLE
OVERHEATS/WATER TEMPERATURE HIGH
EXCESSIVE FUEL CONSUMPTION
EXCESSIVE OIL CONSUMPTION
BATTERY DEAD (UNDER CHARGE)
Warranty symptom code AA AB AC AD AE AF AG AH AJ AK AL AM HA
Fuel Fuel pump circuit 11232 22 3 2EC-690
Fuel pressure regulator system334444444 4EC-392
Fuel injector circuit 11232 22 2EC-684
Evaporative emission system 334444444 4EC-366
Air Positive crankcase ventilation sys-
tem
334444444 41EC-370
Incorrect idle speed adjustment 1 1 1 1 1EC-381
Electric throttle control actuator 112332222 2 2EC-552,
EC-555
IgnitionIncorrect ignition timing adjustment 33111 11 1EC-381
Ignition circuit 11222 22 2EC-735
Main power supply and ground circuit22333 33 23EC-451
Mass air flow sensor circuit
1
122
222 2EC-466
Engine coolant temperature sensor circuit
333EC-474
Heated oxygen sensor 1 circuitEC-486
,
EC-496
,
EC-696
Throttle position sensor circuit
22EC-479
,
EC-505
,
EC-586
,
EC-588
,
EC-645
Accelerator pedal position sensor circuit 3 2 1EC-590
,
EC-631
,
EC-638
,
EC-652
Knock sensor circuit 2 3EC-512
Crankshaft position sensor (POS) circuit 2 2EC-517
Camshaft position sensor (PHASE) circuit 3 2EC-524
Vehicle speed signal circuit 2 3 3 3EC-762
Power steering pressure sensor circuit 2 3 3EC-533
ECM 22333333333EC-538,
EC-541

EC-404
[VQ]
TROUBLE DIAGNOSIS

Air Air duct
55555 5EM-131
Air cleanerEM-131
Air leakage from air duct
(Mass air flow sensor — electric
throttle control actuator)
5555EM-131
Electric throttle control actuatorEM-133
Air leakage from intake manifold/
Collector/GasketEM-133,
EM-138
Cranking Battery
111111
11SC-4
Generator circuitSC-27
Starter circuit 3EM-228
Signal plate 6EM-228
PNP switch 4AT- 2 3 0,
CVT-62
Engine Cylinder head
55555 55 5EM-210
Cylinder head gasket 4 3
Cylinder block
66666 66 64
EM-228
Piston
Piston ring
Connecting rod
Bearing
Crankshaft
Va l v e
mecha-
nismTiming chain
55555 55 5EM-173
CamshaftEM-192
Intake valve timing controlEM-173
Intake valve
3EM-210
Exhaust valve
Exhaust Exhaust manifold/Tube/Muffler/
Gasket
55555 55 5EM-140
,
EX-2
Three way catalyst
Lubrica-
tionOil pan/Oil strainer/Oil pump/Oil
filter/Oil gallery/Oil cooler
55555 55 5EM-145
,
LU-22
, LU-
23 , LU-25
Oil level (Low)/Filthy oilLU-19
SYMPTOM
Reference
page
HARD/NO START/RESTART (EXCP. HA)
ENGINE STALL
HESITATION/SURGING/FLAT SPOT
SPARK KNOCK/DETONATION
LACK OF POWER/POOR ACCELERATION
HIGH IDLE/LOW IDLE
ROUGH IDLE/HUNTING
IDLING VIBRATION
SLOW/NO RETURN TO IDLE
OVERHEATS/WATER TEMPERATURE HIGH
EXCESSIVE FUEL CONSUMPTION
EXCESSIVE OIL CONSUMPTION
BATTERY DEAD (UNDER CHARGE)
Warranty symptom code AA AB AC AD AE AF AG AH AJ AK AL AM HA

EC-416
[VQ]
TROUBLE DIAGNOSIS

2OHeated oxygen sensor 1
heater (Bank 1)[Engine is running]

Warm-up condition

Engine speed: Below 3,600 rpmApproximately 8V
[Engine is running]

Warm-up condition

Engine speed: Above 3,600 rpmBATTERY VOLTAGE
(11 - 14V)
3G/WThrottle control motor relay
power supply[Ignition switch: ON]BATTERY VOLTAGE
(11 - 14V)
4 L Throttle control motor (Close)[Ignition switch: ON]

Engine: Stopped

Shift lever: D

Accelerator pedal: Fully releasedApproximately 2.1V
5 Y Throttle control motor (Open)[Ignition switch: ON]

Engine: Stopped

Shift lever: D

Accelerator pedal: Fully depressedApproximately 3V
6R/LHeated oxygen sensor 2
heater (Bank 2)[Engine is running]

Engine speed: Below 3,600 rpm after the
following conditions are met
–Engine: After warming up
–Keeping the engine speed between 3,500
and 4,000 rpm for 1 minute and at idle for 1
minute under no load0 - 1.0V
[Ignition switch: ON]

Engine: Stopped
[Engine is running]

Engine speed: Above 3,600 rpmBATTERY VOLTAGE
(11 - 14V)
8W/LElectronic controlled engine
mount-1[Engine is running]

Idle speed (with vehicle stopped)0 - 3.0V
[Engine is running]

Except above conditionsBATTERY VOLTAGE
(11 - 14V)
9O/BElectronic controlled engine
mount-2[Engine is running]

Idle speed (with vehicle stopped)BATTERY VOLTAGE
(11 - 14V)
[Engine is running]

Except above conditions0 - 3.0V TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
PBIB0519E
PBIB1104E
PBIB1105E

EC-420
[VQ]
TROUBLE DIAGNOSIS

40
41
42P/B
LG/R
R/WFuel injector No. 6
Fuel injector No. 4
Fuel injector No. 2[Engine is running]

Warm-up condition

Idle speed
NOTE:
The pulse cycle changes depending on rpm
at idleBATTERY VOLTAGE
(11 - 14V)
[Engine is running]

Warm-up condition

Engine speed: 2,000 rpmBATTERY VOLTAGE
(11 - 14V)
45 PEVAP canister purge volume
control solenoid valve[Engine is running]

Idle speedBATTERY VOLTAGE
(11 - 14V)
[Engine is running]

Engine speed: About 2,000 rpm (More than
100 seconds after starting engine)BATTERY VOLTAGE
(11 - 14V)
47 WSensor power supply
(Throttle position sensor)[Ignition switch: ON]Approximately 5V
49 BR/WSensor power supply
(Refrigerant pressure sensor)[Ignition switch: ON]Approximately 5V
50 Y Throttle position sensor 1[Ignition switch: ON]

Engine: Stopped

Shift lever: D

Accelerator pedal: Fully releasedMore than 0.36V
[Ignition switch: ON]

Engine: Stopped

Shift lever: D

Accelerator pedal: Fully depressedLess than 4.75V TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
SEC984C
SEC985C
SEC990C
SEC991C

TROUBLE DIAGNOSIS
EC-421
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51 W Mass air flow sensor[Ignition switch: ON]Approximately 0.4V
[Engine is running]

Warm-up condition

Idle speed0.9 - 1.1V (VQ23DE engine)
1.0 - 1.3V (VQ35DE engine)
[Engine is running]

Warm-up condition

Engine is revving from idle to about 4,000
rpm0.9 - 1.1 to Approx. 2.4
(VQ23DE engine)
1.0 - 1.3 to Approx. 2.4
(VQ35DE engine)
(Check for linear voltage rise in
response to engine being
increased to about 4,000 rpm.)
55 WHeated oxygen sensor 2
(Bank 2)[Engine is running]

Revving engine from idle up to 3,000 rpm
quickly after the following conditions are
met.
–Engine: After warming up
–Keeping the engine speed between 3,500
and 4,000 rpm for 1 minute and at idle for 1
minute under no load0 - Approximately 1.0V
60
61
62P/W
L/R
Y/RIgnition signal No. 5
Ignition signal No. 3
Ignition signal No. 1[Engine is running]

Warm-up condition

Idle speed
NOTE:
The pulse cycle changes depending on rpm
at idle0 - 0.3V
[Engine is running]

Warm-up condition

Engine speed: 2,500 rpm0.1 - 0.6V
66 LSensor ground
(Throttle position sensor)[Engine is running]

Warm-up condition

Idle speedApproximately 0V
67 Y Sensor ground[Engine is running]

Warm-up condition

Idle speedApproximately 0V
68 LSensor power supply
(PSP sensor)[Ignition switch: ON]Approximately 5V
69 G Throttle position sensor 2[Ignition switch: ON]

Engine: Stopped

Shift lever: D

Accelerator pedal: Fully releasedLess than 4.75V
[Ignition switch: ON]

Engine: Stopped

Shift lever: D

Accelerator pedal: Fully depressedMore than 0.36V TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
SEC986C
SEC987C

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 switch: ON]

Engine: Stopped

Accelerator pedal: Fully depressedMore than 2.0V
99 G/Y ASCD steering switch[Ignition switch: ON]

ASCD steering switch: OFFApproximately 4V
[Ignition switch: ON]

MAIN switch: PressedApproximately 0V
[Ignition switch: ON]

CANCEL switch: PressedApproximately 1V
[Ignition switch: ON]

RESUME/ACCELERATE switch: PressedApproximately 3V
[Ignition switch: ON]

SET/COAST switch: PressedApproximately 2V
101 R/G Stop lamp switch[Ignition switch: OFF]

Brake pedal: Fully releasedApproximately 0V
[Ignition switch: OFF]

Brake pedal: Slightly depressedBATTERY VOLTAGE
(11 - 14V)
102 G/W PNP switch[Ignition switch: ON]

Shift lever: P or NApproximately 0V
[Ignition switch: ON]

Except aboveBATTERY VOLTAGE
(11 - 14V)
103 L/OR Tachometer signal output[Engine is running]

Warm-up condition

Idle speed
NOTE:
The pulse cycle changes depending on rpm
at idleApproximately 0.8V
[Engine is running]

Warm-up condition

Engine speed: 2,000 rpmApproximately 0.8V
104 P/L Throttle control motor relay[Ignition switch: OFF]BATTERY VOLTAGE
(11 - 14V)
[Ignition switch: ON]0 - 1.0V
106 WAccelerator pedal position
sensor 1[Ignition switch: ON]

Engine: Stopped

Accelerator pedal: Fully released0.65 - 0.87V
[Ignition switch: ON]

Engine: Stopped

Accelerator pedal: Fully depressedMore than 4.3V TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
MBIB0053E
MBIB0054E

EC-426
[VQ]
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 freeze frame data. The items appear on CONSULT-II screen in freeze frame data
mode only if a 1st trip DTC or DTC is detected. For details, refer to EC-427, "
Freeze Frame Data and 1st Trip Freeze Frame Data" . ItemDIAGNOSTIC TEST MODE
WORK
SUPPORTSELF-DIAGNOSTIC
RESULTS
DATA
MONITORDATA
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××
Wheel sensor×××
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××
Load signal××
ASCD steering switch×××
ASCD brake switch×××
ENGINE CONTROL COMPONENT PARTS
OUTPUT
Fuel injector×××
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×××
Electronic controlled engine mount×××