NISSAN LATIO 2009 Service Repair Manual

EC
NP
O
OK >>
INSPECTION END
NG >> GO TO 15. OK >>
INSPECTION END
NG >> Detect malfunctioning part according to EC-1095, " Symptom Matrix Chart " .
OK >>
INSPECTION END
NG (More than the SP value)>>GO TO 18.
NG (Less than the SP value)>>GO TO 25. OK >> GO TO 21.
NG >> Repair or replace malfunctioning part, and then GO TO 20. OK >>
INSPECTION END
NG (“B/FUEL SCHDL” is more, “A/F ALPHA- B1” is less than the SP value)>>GO TO 21.

OK >> 1. Detect malfunctioning part of mass air flow sensor circuit and repair it. Refer to
EC-1170 .
2. GO TO 29.
NG >> GO TO 23. OK >> GO TO 24.
NG (More than the SP value)>>Replace mass air flow sensor, and then GO TO 29. ECM Re-communicating Function " .
3. Perform EC-1084, " VIN Registration " .
4. Perform EC-1084, " Accelerator Pedal Released Position Learning " .
5. Perform EC-1084, " Throttle Valve Closed Position Learning " .
6. Perform EC-1084, " Idle Air Volume Learning " .
>> GO TO 29. OK >> GO TO 27.
NG >> Repair or replace malfunctioning part, and then GO TO 26. OK >>
INSPECTION END
NG (Less than the SP value)>>GO TO 27. OK >> GO TO 28.
NG (Less than the SP value)>>Replace mass air flow sensor, and then GO TO 30.

EC
NP
O
• Disconnection, looseness, and cracks in air duct
• Looseness of oil filler cap
• Disconnection of oil level gauge
• Open stuck, breakage, hose disconnection, or cracks of PCV valve
• Disconnection or cracks of EVAP purge hose, open stuck of EVAP canister purge volume control solenoid
valve
• Malfunctioning seal of rocker cover gasket
• Disconnection, looseness, or cracks of hoses, such as vacuum hose, connecting to intake air system parts
• Malfunctioning seal of intake air system, etc.
>> GO TO 30. OK >>
INSPECTION END
NG >> Detect malfunctioning part according to EC-1095, " Symptom Matrix Chart " .
OK >>
INSPECTION END
NG >> Detect malfunctioning part according to EC-1095, " Symptom Matrix Chart " .

Emission-related Diagnostic Information " .
>> GO TO 2. Ground Inspection " .
OK or NG OK >> GO TO 3.
NG >> Repair or replace. How to Perform Efficient Diagnosis for an Electrical Incident " , “INCIDENT SIMULATION
TESTS”.
OK or NG OK >> GO TO 4.
NG >> Repair or replace. How to Check Terminal " , “HOW TO PROBE CONNECTORS”, “How to Check Enlarged Con-
tact Spring of Terminal”.
OK or NG OK >>
INSPECTION END
NG >> Repair or replace connector. STEP in Work Flow Situation
2 The CONSULT-III is used. The SELF-DIAG RESULTS screen shows time data other than 0 or [1t].
3 or 4 The symptom described by the customer does not recur. 5 (1st trip) DTC does not appear during the DTC Confirmation Procedure.
10 The Diagnostic Procedure for PXXXX does not indicate the malfunctioning area.

POWER SUPPLY AND GROUND CIRCUIT
EC-1139
< SERVICE INFOMATION >
[MR TYPE 2] C
D E
F
G H
I
J
K L
M A EC
NP
O
POWER SUPPLY AND GROUND CIRCUIT
Wiring Diagram INFOID:0000000004499955
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals wh en measuring input/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. BBWA2625E

EC-1140< SERVICE INFOMATION >
[MR TYPE 2]
POWER SUPPLY AND GROUND CIRCUIT
Diagnosis Procedure INFOID:00000000044999561.
INSPECTION START
Start engine.
Is engine running?
Yes or No Yes >> GO TO 8.
No >> GO TO 2. 2.
CHECK ECM POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF and then ON.
2. Check voltage between ECM terminal 93 and ground with CON- SULT-III or tester.
OK or NG OK >> GO TO 4.
NG >> GO TO 3. 3.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors M69, E7
• 10A fuse
• Harness for open or short between ECM and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors. 4.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground screw on the body. Refer to EC-1144, " Ground Inspection " .
TER-
MI-
NAL
NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
10 11 B
B ECM ground
[Engine is running]
• Idle speed Body ground
32 P ECM relay
(Self shut-off) [Engine is running]
[Ignition switch: OFF]
• For a few seconds after turning ignition switch OFF 0 - 1.0V
[Ignition switch: OFF]
• More than a few seconds after turning ignition
switch OFF BATTERY VOLTAGE
(11 - 14V)
93 O Ignition switch [Ignition switch: OFF]
0V
[Ignition switch: ON] BATTERY VOLTAGE
(11 - 14V)
105 G Power supply for
ECM [Ignition switch: ON] BATTERY VOLTAGE
(11 - 14V)
108 B ECM ground [Engine is running]
• Idle speed Body groundVoltage: Battery voltage
PBIA9561J

POWER SUPPLY AND GROUND CIRCUIT
EC-1141
< SERVICE INFOMATION >
[MR TYPE 2] C
D E
F
G H
I
J
K L
M A EC
NP
O
OK or NG OK >> GO TO 5.
NG >> Repair or replace ground connections. 5.
CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminals 10, 11, 108 and ground.
Refer to Wiring Diagram.
3. Also check harness for short to power.
OK or NG OK >> GO TO 7.
NG >> GO TO 6. 6.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors F8, E8
• Harness for open or short between ECM and ground
>> Repair open circuit or short to power in harness or connectors. 7.
CHECK ECM POWER SUPPLY CIRCUIT-II
1. Reconnect ECM harness connector.
2. Turn ignition switch ON.
3. Check voltage between IPDM E/R terminal 3 and ground with
CONSULT-III or tester.
OK or NG OK >> Go to
EC-1518 .
NG >> GO TO 8. 8.
CHECK ECM POWER SUPPLY CIRCUIT-III
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON and then OFF. :
Vehicle front
1. Body ground E24 2. Engine ground F9 3. Engine ground F16
4. Body ground E15 BBIA0698E
Continuity should exist.
Voltage: Battery voltage PBIB2658E

EC-1142< SERVICE INFOMATION >
[MR TYPE 2]
POWER SUPPLY AND GROUND CIRCUIT
3. Check voltage between ECM terminal 105 and ground with CONSULT-III or tester.
OK or NG OK >> GO TO 14.
NG (Battery voltage does not exist.)>>GO TO 9.
NG (Battery voltage exists for more than a few seconds.)>>GO TO 11. 9.
CHECK ECM POWER SUPPLY CIRCUIT-IV
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Check voltage between ECM terminal 32 and ground with CON-
SULT-III or tester.
OK or NG OK >> GO TO 10.
NG >> GO TO 11. 10.
CHECK ECM POWER SUPPLY CIRCUIT-V
1. Disconnect ECM harness connector.
2. Disconnect IPDM E/R harness connector E43.
3. Check harness continuity between ECM terminal 105 and IPDM E/R terminal 4.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG OK >> GO TO 17.
NG >> Repair open circuit or short to ground or short to power in harness or connectors. 11.
CHECK ECM POWER SUPPLY CIRCUIT-VI
1. Disconnect ECM harness connector.
2. Disconnect IPDM E/R harness connector E43.
3. Check harness continuity between ECM terminal 32 and IPDM E/R terminal 7.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG OK >> GO TO 13.
NG >> GO TO 12. 12.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E8, F8
• Harness for open or short between ECM and IPDM E/R
>> Repair open circuit or short to ground or short to power in harness or connectors.
Voltage: After turning ignition switch OFF, battery
voltage will exist for a few seconds, then drop
approximately 0V. PBIB3037E
Voltage: Battery voltage
PBIA9562J
Continuity should exist.
Continuity should exist.

POWER SUPPLY AND GROUND CIRCUIT
EC-1143
< SERVICE INFOMATION >
[MR TYPE 2] C
D E
F
G H
I
J
K L
M A EC
NP
O 13.
CHECK 20A FUSE
1. Disconnect 20A fuse from IPDM E/R.
2. Check 20A fuse.
OK or NG OK >> GO TO 17.
NG >> Replace 20A fuse. 14.
CHECK GROUND CONNECTIONS
1. Loosen and retighten ground screw on the body. Refer to EC-1144, " Ground Inspection " .
OK or NG OK >> GO TO 15.
NG >> Repair or replace ground connections. 15.
CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminals 10, 11, 108 and ground.
Refer to Wiring Diagram.
3. Also check harness for short to power.
OK or NG OK >> GO TO 17.
NG >> GO TO 16. 16.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors F8, E8
• Harness for open or short between ECM and ground
>> Repair open circuit or short to power in harness or connectors. 17.
CHECK INTERMITTENT INCIDENT
Refer to EC-1138 .
OK or NG OK >> Replace IPDM E/R. Refer to
PG-27, " Removal and Installation of IPDM E/R " .
NG >> Repair open circuit or short to power in harness or connectors. :
Vehicle front
1. Body ground E24 2. Engine ground F9 3. Engine ground F16
4. Body ground E15 BBIA0698E
Continuity should exist.

EC-1144< SERVICE INFOMATION >
[MR TYPE 2]
POWER SUPPLY AND GROUND CIRCUIT
Ground Inspection INFOID:0000000004499957
Ground connections are very important to the proper oper ation of electrical and electronic circuits. Ground
connections are often exposed to moisture, dirt and ot her corrosive elements. The corrosion (rust) can
become an unwanted resistance. This unwanted resistance can change the way a circuit works.
Electronically controlled circuits are very sensitive to proper grounding. A loose or corroded ground can drasti-
cally affect an electronically controlled circuit. A poor or corroded ground can easily affect the circuit. Even
when the ground connection looks clean, there can be a thin film of rust on the surface.
When inspecting a ground connection follow these rules:
• Remove the ground bolt or screw.
• Inspect all mating surfaces for tarnish, dirt, rust, etc.
• Clean as required to assure good contact.
• Reinstall bolt or screw securely.
• Inspect for “add-on” accessories which may be interfering with the ground circuit.
• If several wires are crimped into one ground eyelet termi nal, check for proper crimps. Make sure all of the
wires are clean, securely fastened and providing a good ground path. If multiple wires are cased in one eye-
let make sure no ground wires have excess wire insulation.
For detailed ground distribution information, refer to PG-29, " Ground Distribution " .
PBIB1870E