2009 NISSAN LATIO service

EC-1000< SERVICE INFOMATION >
[MR TYPE 1]
IGNITION SIGNAL
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnosis Procedure INFOID:00000000045375371.
CHECK ENGINE START
Turn ignition switch OFF, and restart engine.
Is engine running?
Yes or No Yes (With CONSULT-III)>>GO TO 2.
Yes (Without CONSULT-III)>>GO TO 3.
No >> GO TO 4. 2.
CHECK OVERALL FUNCTION
With CONSULT-III
1. Perform “POWER BALANCE” in “A CTIVE TEST” mode with CONSULT-III.
2. Make sure that each circuit produces a momentary engine speed drop.
OK or NG OK >>
INSPECTION END
NG >> GO TO 10. 3.
CHECK OVERALL FUNCTION
Without CONSULT-III
1. Let engine idle.
2. Read the voltage signal between ECM terminals 17, 18, 21, 22
and ground with an oscilloscope.
3. Verify that the oscilloscope screen shows the signal wave as shown below.
NOTE:
The pulse cycle changes depending on rpm at idle.
OK or NG TER-
MI-
NAL
NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
17
18
21
22 R
LG
G
SB Ignition signal No. 1
Ignition signal No. 2
Ignition signal No. 4
Ignition signal No. 3 [Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending on rpm
at idle 0 - 0.3V
[Engine is running]
• Warm-up condition
• Engine speed: 2,500 rpm 0.2 - 0.5V PBIA9265J
PBIA9266J
PBIA9567J
PBIA9265J

IGNITION SIGNAL
EC-1001
< SERVICE INFOMATION >
[MR TYPE 1] C
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OK >>
INSPECTION END
NG >> GO TO 10. 4.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
2. Check voltage between ECM terminal 105 and ground with CONSULT-III or tester.
OK or NG OK >> GO TO 5.
NG >> Go to EC-627 .
5.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect condenser-2 (1) harness connector.
3. Turn ignition switch ON.
4. Check voltage between condenser-2 terminal 1 and ground with CONSULT-III or tester.
OK or NG OK >> GO TO 8.
NG >> GO TO 6. 6.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connector E43.
3. Check harness continuity between IPDM E/R terminal 3 and condenser-2 terminal 1.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG OK >> Go to
EC-627 .
NG >> GO TO 7. 7.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E8, F8 Voltage: Battery voltage
PBIA9575J
PBIB3329E
Voltage: Battery voltage
PBIB0624E
Continuity should exist.

EC-1002< SERVICE INFOMATION >
[MR TYPE 1]
IGNITION SIGNAL
• Harness for open or short between IPDM E/R and condenser-2 >> Repair open circuit or short to ground or short to power in harness or connectors. 8.
CHECK CONDENSER-2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check harness continuity between condenser-2 terminal 2 and ground.
Refer to Wiring Diagram.
3. Also check harness for short to power.
OK or NG OK >> GO TO 9.
NG >> Repair open circuit or short to power in harness or connectors. 9.
CHECK CONDENSER-2
Refer to EC-1003, " Component Inspection "
OK or NG
OK >> GO TO 10.
NG >> Replace condenser-2. 10.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT-IV
1. Turn ignition switch OFF.
2. Reconnect all harness connectors disconnected.
3. Disconnect ignition coil (1) harness connector.
4. Turn ignition switch ON.
5. Check voltage between ignition coil terminal 3 and ground with CONSULT-III or tester.
OK or NG OK >> GO TO 12.
NG >> GO TO 11. 11.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connector F8
• Harness for open or short between ignition coil and harness connector F8
>> Repair or replace harness or connectors. 12.
CHECK IGNITION COIL GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF. Continuity should exist.
PBIB3328E
Voltage: Battery voltage
PBIB0138E

IGNITION SIGNAL
EC-1003
< SERVICE INFOMATION >
[MR TYPE 1] C
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2. Check harness continuity between ignition coil terminal 2 and ground.
Refer to Wiring Diagram.
3. Also check harness for short to power.
OK or NG OK >> GO TO 13.
NG >> Repair open circuit or short to power in harness or connectors. 13.
CHECK IGNITION COIL OUTPUT SI GNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM termi nals 17, 18, 21, 22 and ignition coil terminal 1.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG OK >> GO TO 14.
NG >> Repair open circuit or short to ground or short to power in harness or connectors. 14.
CHECK IGNITION COIL WITH POWER TRANSISTOR
Refer to EC-1003, " Component Inspection " .
OK or NG OK >> GO TO 15.
NG >> Replace ignition coil with power transistor. 15.
CHECK INTERMITTENT INCIDENT
Refer to EC-626 .
>> INSPECTION END
Component Inspection INFOID:0000000004537538
IGNITION COIL WITH POWER TRANSISTOR CAUTION:
Do the following procedure in the place where ventilation is good without the combustible.
1. Turn ignition switch OFF.
2. Disconnect ignition coil harness connector.
3. Check resistance between ignition coil terminals as follows.
4. If NG, replace ignition coil with power transistor. If OK, go to next step.
5. Turn ignition switch OFF.
6. Reconnect all harness connectors disconnected. Continuity should exist.
Continuity should exist.
Terminal No. (Polarity) Resistance Ω [at 25 °C (77 °F)]
1 and 2 Except 0 or ∞
1 and 3 Except 0
2 and 3 PBIB0847E

EC-1004< SERVICE INFOMATION >
[MR TYPE 1]
IGNITION SIGNAL
7. Remove fuel pump fuse (1) in IPDM E/R (2) to release fuel pres- sure.
NOTE:
Do not use CONSULT-III to releas e fuel pressure, or fuel pres-
sure applies again during the following procedure.
- : Vehicle front
8. Start engine.
9. After engine stalls, crank it two or three times to release all fuel
pressure.
10. Turn ignition switch OFF.
11. Remove all ignition coil harness connectors to avoid the electri-
cal discharge from the ignition coils.
12. Remove ignition coil and spark plug of the cylinder to be checked.
13. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
14. Connect spark plug and harness connector to ignition coil.
15. Fix ignition coil using a rope etc. with gap of 13 - 17 mm between the edge of the spark plug and grounded metal portion
as shown in the figure.
16. Crank engine for about 3 seconds, and check whether spark is generated between the spark plug and the grounded metal por-
tion.
CAUTION:
• Do not approach to the spar k plug and the ignition coil
within 50cm. Be careful not to get an electrical shock
while checking, because the el ectrical discharge voltage
becomes 20kV or more.
• It might cause to damage the ignition coil if the gap of more than 17 mm is taken.
NOTE:
When the gap is less than 13 mm, the spark might be generated even if the coil is malfunctioning.
17. If NG, replace ignition coil with power transistor.
CONDENSER-2
1. Turn ignition switch OFF.
2. Disconnect condenser-2 harness connector.
3. Check resistance between condenser-2 terminals 1 and 2.
4. If NG, replace condenser-2.
Removal and Installation INFOID:0000000004537539
IGNITION COIL WITH POWER TRANSISTOR
Refer to EM-153 .
Spark should be generated. PBIB2958E
PBIB2325E
Resistance: Above 1 M
Ω [at 25 °C (77 °F)] PBIB0794E

EC-1006< SERVICE INFOMATION >
[MR TYPE 1]
REFRIGERANT PRESSURE SENSOR
Wiring Diagram INFOID:0000000004537541
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring in put/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground ot her than ECM terminals, such as the ground. BBWA2662E

REFRIGERANT PRESSURE SENSOR
EC-1007
< SERVICE INFOMATION >
[MR TYPE 1] C
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Diagnosis Procedure
INFOID:00000000045375421.
CHECK REFRIGERANT PRESSURE SENSOR OVERALL FUNCTION
1. Start engine and warm it up to normal operating temperature.
2. Turn A/C switch and blower fan switch ON.
3. Check voltage between ECM terminal 41 and ground with CON- SULT-III or tester.
OK or NG OK >>
INSPECTION END
NG >> GO TO 2. 2.
CHECK GROUND CONNECTIONS
1. Turn A/C switch and blower fan switch OFF.
2. Stop engine and turn ignition switch OFF.
3. Loosen and retighten ground screw on the body. Refer to EC-632, " Ground Inspection " .
OK or NG OK >> GO TO 3.
NG >> Repair or replace ground connections. 3.
CHECK REFRIGERANT PRESSURE SE NSOR POWER SUPPLY CIRCUIT
TERMI-
NAL NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
41 GR Refrigerant pressure sensor [Engine is running]
• Warm-up condition
• Both A/C switch and blower fan switch: ON
(Compressor operates) 1.0 - 4.0V
48 BR Sensor ground
(Refrigerant pressure sensor) [Engine is running]
• Warm-up condition
• Idle speed Approximately 0V
74 W Sensor power supply
(Refrigerant pressure sensor) [Ignition switch: ON]
Approximately 5VVoltage: 1.0 - 4.0V
PBIA9574J
:
Vehicle front
1. Body ground E24 2. Engine ground F9 3. Engine ground F16
4. Body ground E15 BBIA0698E

EC-1008< SERVICE INFOMATION >
[MR TYPE 1]
REFRIGERANT PRESSURE SENSOR
1. Disconnect refrigerant pressure sensor (1) harness connector.
- : Vehicle front
2. Turn ignition switch ON.
3. Check voltage between refrigerant pressure sensor terminal 3 and ground with CONSULT-III or tester.
OK or NG OK >> GO TO 5.
NG >> GO TO 4. 4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E8, F8
• Harness for open or short between refrigerant pressure sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors. 5.
CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between refrigerant pressure sensor terminal 1 and ECM terminal 48.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG OK >> GO TO 7.
NG >> GO TO 6. 6.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E8, F8
• Harness for open or short between refrigerant pressure sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors. 7.
CHECK REFRIGERANT PRESSURE SENSOR INPU T SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between refrigerant pressure sensor terminal 2 and ECM terminal 41. Refer to Wiring Diagram.
2. Also check harness for short to ground and short to power.
OK or NG BBIA0713E
Voltage: Approximately 5V
SEF479Y
Continuity should exist.
Continuity should exist.