Page 1705 of 4331

EC
NP
O
P0506 ISC SYSTEM
Description INFOID:0000000004780224
The ECM controls the engine idle speed to a specified leve l through the fine adjustment of the air, which is let
into the intake manifold, by operating the electric thrott le control actuator. The operating of the throttle valve is
varied to allow for optimum control of the engine idli ng speed. The crankshaft position sensor (POS) detects
the actual engine speed and sends a signal to the ECM.
The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value
memorized in the ECM. The target engine speed is t he lowest speed at which the engine can operate steadily.
The optimum value stored in the ECM is determined by taking into consideration various engine conditions,
such as during warming up, deceleration, and engine load (air conditioner, power steering and cooling fan
operation, etc.).
DTC Logic INFOID:0000000004780225
DTC DETECTION LOGIC NOTE:
If DTC P0506 is displayed with ot her DTC, first perform the trouble diagnosis for the other DTC.
DTC CONFIRMATION PROCEDURE IDLE AIR VOLUME LEARNING :
Special Repair Requirement " , before conducting DTC Confirmation Procedure.
TESTING CONDITION:
• Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
• Always perform the test at a temperature above −10 °C(14 °F).
>> GO TO 2. YES >> Go to
EC-349, " Diagnosis Procedure " .
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000004780226YES >> Discover air leak location and repair.
NO >> GO TO 2.
Page 1706 of 4331
ADDITIONAL SERVICE WHEN REPLACING CO
NTROL UNIT : Special Repair Require-ment " .
>> INSPECTION END
Page 1707 of 4331

EC
NP
O
P0507 ISC SYSTEM
Description INFOID:0000000004780227
The ECM controls the engine idle speed to a specified leve l through the fine adjustment of the air, which is let
into the intake manifold, by operating the electric thrott le control actuator. The operating of the throttle valve is
varied to allow for optimum control of the engine idli ng speed. The crankshaft position sensor (POS) detects
the actual engine speed and sends a signal to the ECM.
The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value
memorized in the ECM. The target engine speed is t he lowest speed at which the engine can operate steadily.
The optimum value stored in the ECM is determined by taking into consideration various engine conditions,
such as during warming up, deceleration, and engine load (air conditioner, power steering and cooling fan
operation, etc.).
DTC Logic INFOID:0000000004780228
DTC DETECTION LOGIC NOTE:
If DTC P0507 is displayed with ot her DTC, first perform the trouble diagnosis for the other DTC.
DTC CONFIRMATION PROCEDURE IDLE AIR VOLUME LEARNING :
Special Repair Requirement " , before conducting DTC Confirmation Procedure.
TESTING CONDITION:
• Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
• Always perform the test at a temperature above −10 °C(14 °F).
>> GO TO 2. YES >> Go to
EC-351, " Diagnosis Procedure " .
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000004780229YES >> GO TO 2.
NO >> Repair or replace.
Page 1708 of 4331
YES >> Discover air leak location and repair.
NO >> GO TO 3. ADDITIONAL SERVICE WHEN REPLACING CO
NTROL UNIT : Special Repair Require-ment " .
>> INSPECTION END
Page 1709 of 4331
EC
NP
O
P0603 ECM POWER SUPPLY
Description INFOID:0000000004780234
ECM has the memory function of the DTC memory, the air-fuel ratio
feedback compensation value memory, the idle air volume learning
value memory, etc. even when the ignition switch is turned ON.
DTC Logic INFOID:0000000004780235
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE YES >> Go to
EC-353, " Diagnosis Procedure " .
NO >> INSPECTION END
Diagnosis Procedure INFOID:0000000004780236Diagnosis Description " .
3. Perform DTC CONFIRMATION PROCEDURE. Refer to EC-353, " DTC Logic " .
Is the 1st trip DTC P0603 displayed again? YES >> GO TO 2.
NO >> INSPECTION END ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Require-
ment " .
Page 1710 of 4331
Page 1711 of 4331
![NISSAN LATIO 2009 Service Repair Manual P0605 ECM
EC-355
< COMPONENT DIAGNOSIS >
[HR16DE] C
D E
F
G H
I
J
K L
M A EC
NP
O
P0605 ECM
Description INFOID:0000000004780237
The ECM consists of a microcomputer and connectors for signal
i NISSAN LATIO 2009 Service Repair Manual P0605 ECM
EC-355
< COMPONENT DIAGNOSIS >
[HR16DE] C
D E
F
G H
I
J
K L
M A EC
NP
O
P0605 ECM
Description INFOID:0000000004780237
The ECM consists of a microcomputer and connectors for signal
i](/manual-img/5/57359/w960_57359-1710.png)
P0605 ECM
EC-355
< COMPONENT DIAGNOSIS >
[HR16DE] C
D E
F
G H
I
J
K L
M A EC
NP
O
P0605 ECM
Description INFOID:0000000004780237
The ECM consists of a microcomputer and connectors for signal
input and output and for power supply. The ECM controls the engine.
DTC Logic INFOID:0000000004780238
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE 1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conduc ted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
>> GO TO 2. 2.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A
1. Turn ignition switch ON.
2. Check 1st trip DTC.
Is 1st trip DTC detected? YES >> Go to
EC-356, " Diagnosis Procedure " .
NO >> GO TO 3. 3.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B
1. Turn ignition switch ON and wait at least 1 second.
2. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
3. Check 1st trip DTC.
Is 1st trip DTC detected? YES >> Go to
EC-356, " Diagnosis Procedure " .
NO >> GO TO 4. 4.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION C
1. Turn ignition switch ON and wait at least 1 second.
2. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
3. Repeat step 2 for 32 times.
4. Check 1st trip DTC.
Is 1st trip DTC detected? YES >> Go to
EC-356, " Diagnosis Procedure " .
NO >> INSPECTION END PBIA9222J
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0605 Engine control module A) ECM calculation function is malfunctioning.
• ECM
B) ECM EEP-ROM system is malfunctioning.
C) ECM self shut-off function is malfunctioning.
Page 1712 of 4331
Diagnosis Description " .
3. Perform DTC CONFIRMATION PROCEDURE. Refer to EC-355, " DTC Logic " .
Is the 1st trip DTC P0605 displayed again? YES >> GO TO 2.
NO >> INSPECTION END ADDITIONAL SERVICE WHEN REPLACING CO
NTROL UNIT : Special Repair Require-ment " .
>> INSPECTION END