2007 NISSAN TIIDA EC Engine Control System

EC-1018
< ECU DIAGNOSIS >[MR18DE]
ECM
DTC RELATED ITEM
Engine operating condi-
tion in fail-safe modeDetected items RemarksReference
page
Engine speed will not
rise more than 2,500 rpm
due to the fuel cutMalfunction indicator
circuitWhen 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.EC-986
DTC No. Detected items Engine operating condition in fail-safe mode
P0011 Intake valve timing control The signal is not energized to the intake valve timing control solenoid valve and the valve
control does not function.
P0102
P0103Mass air flow sensor circuit Engine speed will not rise more than 2,400 rpm due to the fuel cut.
P0117
P0118Engine coolant tempera-
ture sensor circuitEngine coolant temperature will be determined by ECM based on the time after following
condition.
CONSULT-III displays the engine coolant temperature decided by ECM.
ConditionEngine coolant temperature decided
(CONSULT-III display)
Just as ignition switch is turned ON
or START40°C (104°F)
Approx. 4 minutes after engine
stating80°C (176°F)
Except as shown above40 - 80°C (104 - 176°F)
(Depends on the time)
When the fail-safe system for engine coolant temperature sensor is activated, the cooling
fan operates while engine is running.
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.
P0500 Vehicle speed sensor When the fail-safe system for vehicle speed sensor is activated, the cooling fan operates
(Highest) while engine is running.
P0605 ECM (When ECM calculation function is malfunctioning:)
ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
ECM deactivates ASCD operation.
P1121 Electric throttle control ac-
tuator(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 Neutral 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.

ECM
EC-1019
< ECU DIAGNOSIS >[MR18DE]
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DTC Inspection Priority ChartINFOID:0000000001161993
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
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. DTC No. Detected items Engine operating condition in fail-safe mode
Priority Detected items (DTC)
1  U1000 U1001 CAN communication line
 U1010 CAN communication
 P0102 P0103 Mass air flow sensor
 P0112 P0113 P0127 Intake air temperature sensor
 P0117 P0118 P0125 Engine coolant temperature sensor
 P0122 P0123 P0222 P0223 P1225 P1226 P2135 Throttle position sensor
 P0327 P0328 Knock sensor
 P0335 Crankshaft position sensor (POS)
 P0340 Camshaft position sensor (PHASE)
 P0500 Vehicle speed sensor
 P0605 ECM
 P1229 sensor power supply
 P1610 P1611 P1614 NATS
 P1706 Park/Neutral position (PNP) switch
 P2122 P2123 P2127 P2128 P2138 Accelerator pedal position sensor
2  P0132 P0133 P0134 P1143 P1144 Heated oxygen
 P0135 Heated oxygen sensor 1 heater
 P0138 P0139 P1146 P1147 Heated oxygen sensor 2
 P0141 Heated oxygen sensor 2 heater
 P0444 EVAP canister purge volume control solenoid valve
 P 1111 I n t a 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 Throttle control motor relay
 P1128 Throttle control motor
 P1217 Engine over temperature (OVERHEAT)
 P1805 Brake switch
3  P0011 Intake valve timing control
 P0171 P0172 Fuel injection system function
 P0300 - P0304 Misfire
 P0420 Three way catalyst function
 P1121 Electric throttle motor actuator
 P1211 TCS control unit
 P1212 TCS communication line
 P1564 ASCD steering switch
 P1572 ASCD brake switch
 P1574 ASCD vehicle speed sensor

EC-1024
< SYMPTOM DIAGNOSIS >[MR18DE]
ENGINE CONTROL SYSTEM
SYMPTOM DIAGNOSIS
ENGINE CONTROL SYSTEM
Symptom TableINFOID:0000000001161997
SYSTEM — BASIC ENGINE CONTROL SYSTEM
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
Fuel Fuel pump circuit 11232 22 3 2EC-978
Fuel pressure regulator system 334444444 4EC-1035
Fuel injector circuit 11232 22 2EC-975
Evaporative emission system 334444444 4EC-745
Air Positive crankcase ventilation sys-
tem
334444444 41EC-987
Incorrect idle speed adjustment 1 1 1 1 1EC-692
Electric throttle control actuator 112332222 2 2EC-885,
EC-887
IgnitionIncorrect ignition timing adjustment33111 11 1EC-693
Ignition circuit 11222 22 2EC-981
Main power supply and ground circuit 22333 33 23EC-789
Mass air flow sensor circuit
1
122
222 2EC-799
Engine coolant temperature sensor circuit
333EC-807
Heated oxygen sensor 1 circuitEC-813
,
EC-817
,
EC-823
,
EC-896
,
EC-901
Throttle position sensor circuit
22EC-810
,
EC-852
,
EC-924
,
EC-926
,
EC-956
Accelerator pedal position sensor circuit 3 2 1EC-948
,
EC-952
,
EC-956
Knock sensor circuit 2 3EC-860
Crankshaft position sensor (POS) circuit 2 2EC-862

ENGINE CONTROL SYSTEM
EC-1025
< SYMPTOM DIAGNOSIS >[MR18DE]
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1 - 6: The numbers refer to the order of inspection.
(continued on next page)
SYSTEM — ENGINE MECHANICAL & OTHER
Camshaft position sensor (PHASE) circuit 3 2EC-866
Vehicle speed signal circuit 2 3 3 3EC-878
ECM 22333333333EC-880
Intake valve timing control solenoid valve cir-
cuit32 13223 3EC-882
PNP switch circuit 3 3 3 3 3EC-942
Refrigerant pressure sensor circuit 2 3 3 4EC-988
Electrical load signal circuit 3EC-973
Air conditioner circuit 223333333 3 2HAC-92,
HAC-207
ABS actuator and electric unit (control unit) 4BRC-86
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-1026
< SYMPTOM DIAGNOSIS >[MR18DE]
ENGINE CONTROL SYSTEM
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 A
AAB AC AD AE AF AG AH AJ AK AL AM HA
Fuel Fuel tank
5
5FL-10
Fuel piping 555 55 5EM-162
Va p o r l o c k—
Valve deposit
5 555 55 5—
Poor fuel (Heavy weight gasoline,
Low octane)—
Air Air duct
55555 5EM-154
Air cleanerEM-154
Air leakage from air duct
(Mass air flow sensor — electric
throttle control actuator)
555 5EM-156
Electric throttle control actuator
Air leakage from intake manifold/
Collector/Gasket
Cranking Battery
111111
11PG-6
Generator circuitCHG-29
Starter circuit 3STR-24
Signal plate 6EM-219
PNP switch 4TM-665
Engine Cylinder head
55555 55 5EM-198
Cylinder head gasket 4 3
Cylinder block
66666 66 64
EM-200
Piston
Piston ring
Connecting rod
Bearing
Crankshaft
Va l v e
mecha-
nismTiming chain
55555 55 5EM-177
CamshaftEM-186
Intake valve timing controlEM-177
Intake valve
3EM-198
Exhaust valve

ENGINE CONTROL SYSTEM
EC-1027
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1 - 6: The numbers refer to the order of inspection.Exhaust Exhaust manifold/Tube/Muffler/
Gasket
55555 55 5EX-5
, EX-9
Three way catalyst
Lubrica-
tionOil pan/Oil strainer/Oil pump/Oil
filter/Oil gallery/Oil cooler
55555 55 5EM-166
,
LU-18
, LU-
19
Oil level (Low)/Filthy oilLU-15
Cooling Radiator/Hose/Radiator filler cap
55555 55 45CO-40
Thermostat 5CO-45
Water pumpCO-44
Water galleryCO-28
Cooling fan
5CO-43
Coolant level (Low)/Contaminat-
ed coolantCO-35
NATS (NISSAN Anti-Theft System) 1 1SEC-7
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 A
AAB AC AD AE AF AG AH AJ AK AL AM HA

EC-1028
< SYMPTOM DIAGNOSIS >[MR18DE]
NORMAL OPERATING CONDITION
NORMAL OPERATING CONDITION
DescriptionINFOID:0000000001161998
FUEL CUT CONTROL (AT NO LOAD AND HIGH ENGINE SPEED)
If the engine speed is above 1,800 rpm under no load (for example, the selector lever position is neutral and
engine speed is over 1,800 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off var-
ies based on engine speed.
Fuel cut will be operated until the engine speed reaches 1,500 rpm, then fuel cut will be cancelled.
NOTE:
This function is different from deceleration control listed under Multiport Fuel Injection (MFI) System, EC-705,
"SystemDiagram".

EC-1030
< PRECAUTION >[MR18DE]
PRECAUTIONS
On Board Diagnostic (OBD) System of Engine
INFOID:0000000001679887
The ECM has an on board diagnostic system. It will light up the malfunction indicator lamp (MI) to warn the
driver of a malfunction causing emission deterioration.
CAUTION:
 Be sure to turn the ignition switch OFF and disconnect the negative battery cable before any repair
or inspection work. The open/short circuit of related switches, sensors, solenoid valves, etc. will
cause the MI to light up.
 Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will
cause the MI to light up due to the open circuit. (Be sure the connector is free from water, grease,
dirt, bent terminals, etc.)
 Certain systems and components, especially those related to OBD, may use a new style slide-lock-
ing type harness connector. For description and how to disconnect, refer to XX-XX, "*****"
.
 Be sure to route and secure the harnesses properly after work. The interference of the harness with
a bracket, etc. may cause the MI to light up due to the short circuit.
 Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube
may cause the MI to light up due to the malfunction of the EVAP system or fuel injection system, etc.
 Be sure to erase the unnecessary malfunction information (repairs completed) from the ECM before
returning the vehicle to the customer.
General PrecautionsINFOID:0000000001162002
Always use a 12 volt battery as power source.
Do not attempt to disconnect battery cables while engine is
running.
Before connecting or disconnecting the ECM harness con-
nector, turn ignition switch OFF and disconnect negative bat-
tery cable. Failure to do so may damage the ECM because
battery voltage is applied to ECM even if ignition switch is
turned OFF.
Before removing parts, turn ignition switch OFF and then dis-
connect battery ground cable.
Do not disassemble ECM.
If a battery cable is disconnected, the memory will return to
the ECM value.
The ECM will now start to self-control at its initial value.
Engine operation can vary slightly when the terminal is dis-
connected. However, this is not an indication of a malfunc-
tion. Do not replace parts because of a slight variation.
If the battery is disconnected, the following emission-related
diagnostic information will be lost within 24 hours.
-Diagnostic trouble codes
-1st trip diagnostic trouble codes
-Freeze frame data
-1st trip freeze frame data
-System readiness test (SRT) codes
-Test values
When connecting ECM harness connector (1), fasten (B) it
securely with a lever as far as it will go as shown in the figure.
SEF289H
2. ECM
A. Loosen
PBIA9222J
PBIB2947E