Qashqai J11. Engine control system (MR20DD) — part 9
ECM-130
< BASIC INSPECTION >
[MR20DD]
IDLE AIR VOLUME LEARNING
10. Wait 20 seconds.
>> GO TO 4.
4.
CHECK IDLE SPEED AND IGNITION TIMING
Rev up the engine two or three times and make sure that idle speed and ignition timing are within the specifi-
cations. For specification, refer to
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART-1
Check the following
• Check that throttle valve is fully closed.
• Check PCV valve operation.
• Check that downstream of throttle valve is free from air leakage.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace malfunctioning part.
6.
DETECT MALFUNCTIONING PART-2
Engine component parts and their installation condition are questionable. Check and eliminate the cause of
the incident.
It is useful to perform “TROUBLE DIAGNOSIS – SPECIFICATION VALUE”. Refer to
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
>> INSPECTION END
SEC897C
MIXTURE RATIO SELF-LEARNING VALUE CLEAR
ECM-131
< BASIC INSPECTION >
[MR20DD]
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MIXTURE RATIO SELF-LEARNING VALUE CLEAR
Description
INFOID:0000000010702867
This describes how to erase the mixture ratio self-learning value. For the actual procedure, follow the instruc-
tions in “Diagnosis Procedure”.
Work Procedure
INFOID:0000000010702868
1.
START
With CONSULT
1.
Start engine and warm it up to normal operating temperature.
2.
Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT.
3.
Clear mixture ratio self-learning value by touching “CLEAR”.
Without CONSULT
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF.
3.
Disconnect mass air flow sensor harness connector.
4.
Restart engine and let it idle for at least 5 seconds.
5.
Stop engine and reconnect mass air flow sensor harness connector.
6.
Check DTC. Make sure DTC P0102 is detected.
7.
Erase the DTC P0102. Refer to
ECM-63, "On Board Diagnosis Function"
8.
Check DTC. Make sure DTC P0000 is detected.
>> END
ECM-132
< BASIC INSPECTION >
[MR20DD]
BASIC INSPECTION
BASIC INSPECTION
Work Procedure
INFOID:0000000010702869
1.
INSPECTION START
1.
Check service records for any recent repairs that may indicate a related malfunction, or a current need for
scheduled maintenance.
2.
Open engine hood and check the following:
-
Harness connectors for improper connections
-
Wiring harness for improper connections, pinches and cut
-
Vacuum hoses for splits, kinks and improper connections
-
Hoses and ducts for leaks
-
Air cleaner clogging
-
Gasket
3.
Confirm that electrical or mechanical loads are not applied.
-
Headlamp switch is OFF.
-
Air conditioner switch is OFF.
-
Rear window defogger switch is OFF.
-
Steering wheel is in the straight-ahead position, etc.
4.
Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
Ensure engine stays below 1,000 rpm.
5.
Run engine at about 2,000 rpm for about 2 minutes under no
load.
6.
Make sure that no DTC is displayed with CONSULT or Diagnos-
tic Test Mode II (self-diagnostic results).
Is any DTC detected?
YES
>> GO TO 2.
NO
>> GO TO 3.
2.
REPAIR OR REPLACE
Repair or replace components as necessary according to corresponding Diagnostic Procedure.
>> GO TO 3.
3.
CHECK TARGET IDLE SPEED
1.
Run engine at about 2,000 rpm for about 2 minutes under no load.
2.
Rev engine (2,000 to 3,000 rpm) two or three times under no
load, then run engine at idle speed for about 1 minute.
3.
Check idle speed.
For procedure, refer to
.
For specification, refer to
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> GO TO 4.
4.
PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1.
Stop the engine.
2.
Perform accelerator pedal released position learning. Refer to
.
>> GO TO 5.
5.
PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
SEF983U
SEF977U
PBIA8513J
BASIC INSPECTION
ECM-133
< BASIC INSPECTION >
[MR20DD]
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Perform throttle valve closed position learning. Refer to
.
>> GO TO 6.
6.
PERFORM IDLE AIR VOLUME LEARNING
Perform idle air volume learning. Refer to
.
Is Idle Air Volume Learning carried out successfully?
YES
>> GO TO 7.
NO
>> Follow the instruction of IDLE AIR VOLUME LEARNING. Then GO TO 4.
7.
CHECK TARGET IDLE SPEED AGAIN
1.
Start engine and warm it up to normal operating temperature.
2.
Check idle speed.
For procedure, refer to
.
For specification, refer to
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART
Check the Following.
• Check camshaft position sensor and circuit. Refer to
.
• Check exhaust valve timing control position sensor and circuit. Refer to
• Check crankshaft position sensor and circuit. Refer to
.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Repair or replace. Then GO TO 4.
9.
CHECK ECM FUNCTION
Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but this
is a rare case.)
>> GO TO 4.
10.
CHECK IGNITION TIMING
1.
Run engine at idle.
2.
Check ignition timing with a timing light.
For procedure, refer to
.
For specification, refer to
Is the inspection result normal?
YES
>> GO TO 19.
NO
>> GO TO 11.
11.
PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1.
Stop the engine.
2.
Perform accelerator pedal released position learning. Refer to
.
>> GO TO 12.
12.
PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform throttle valve closed position learning. Refer to
.
: Timing indicator
JMBIA0315ZZ
ECM-134
< BASIC INSPECTION >
[MR20DD]
BASIC INSPECTION
>> GO TO 13.
13.
PERFORM IDLE AIR VOLUME LEARNING
Perform idle air volume learning. Refer to
.
Is Idle Air Volume Learning carried out successfully?
YES
>> GO TO 14.
NO
>> Follow the instruction of IDLE AIR VOLUME LEARNING. Then GO TO 4.
14.
CHECK TARGET IDLE SPEED AGAIN
1.
Start engine and warm it up to normal operating temperature.
2.
Check idle speed.
For procedure, refer to
.
For specification, refer to
Is the inspection result normal?
YES
>> GO TO 15.
NO
>> GO TO 17.
15.
CHECK IGNITION TIMING AGAIN
1.
Run engine at idle.
2.
Check ignition timing with a timing light.
For procedure, refer to
.
For specification, refer to
Is the inspection result normal?
YES
>> GO TO 19.
NO
>> GO TO 16.
16.
CHECK TIMING CHAIN INSTALLATION
Check timing chain installation. Refer to
EM-184, "Removal and Installation"
Is the inspection result normal?
YES
>> GO TO 17.
NO
>> Repair the timing chain installation. Then GO TO 4.
17.
DETECT MALFUNCTIONING PART
Check the Following.
• Check camshaft position sensor and circuit. Refer to
• Check exhaust valve timing control position sensor and circuit. Refer to
• Check crankshaft position sensor and circuit. Refer to
.
Is the inspection result normal?
YES
>> GO TO 18.
NO
>> Repair or replace. Then GO TO 4.
18.
CHECK ECM FUNCTION
Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but this
is a rare case.)
>> GO TO 4.
19.
INSPECTION END
If ECM is replaced during this BASIC INSPECTION procedure, perform
>> INSPECTION END
: Timing indicator
JMBIA0315ZZ
FUEL PRESSURE CHECK
ECM-135
< BASIC INSPECTION >
[MR20DD]
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FUEL PRESSURE CHECK
Work Procedure
INFOID:0000000010702870
FUEL PRESSURE RELEASE
1.
FUEL PRESSURE RELEASE
With CONSULT
1.
Turn ignition switch ON.
2.
Perform “ENGINE” in “WORK SUPPORT” mode with CONSULT.
3.
Start the engine.
4.
After engine stalls, crank it two or three times to release all fuel pressure.
5.
Turn ignition switch OFF.
Without CONSULT
1.
Remove fuel pump fuse
located in IPDM E/R.
2.
Start the engine.
3.
After engine stalls, crank it two or three times to release all fuel
pressure.
4.
Turn ignition switch OFF.
5.
Reinstall fuel pump fuse after servicing fuel system.
>> INSPECTION END
FUEL PRESSURE CHECK
1.
FUEL PRESSURE CHECK
1.
Release fuel pressure.
2.
Connect fuel hose for fuel pressure check (B) to fuel pressure
gauge (A) (SST: ST19590000). Then, connect fuel hose for fuel
pressure check to fuel tube adapter (D) (SST: KV10120000) with
hose clamp (C).
CAUTION:
• Use suitable fuel hose for fuel pressure check (genuine
NISSAN fuel hose)
• To avoid unnecessary force or tension to hose, use moderately long fuel hose for fuel pressure
check.
• Wipe off oil or dirt from hose insertion part using cloth moistened with gasoline.
• Apply proper amount of gasoline on the hose insertion part.
• Use NISSAN genuine hose clamp (part number: 16439 N4710 or 16439 N4710)
• Install hose clamp to the hose end position within 1- 2 mm (0.04 - 0.08 in) and tighten hose clamp
to the specified torque.
3.
Disconnect quick connector and disconnect fuel feed hose from high pressure fuel pump. Refer to
CAUTION:
• Make sure to release fuel pressure before removal of fuel line.
• Do the following procedure in the place where ventilation is good without the combustible.
NOTE:
• Prepare pans or saucers under the disconnected fuel line because the fuel may spill out. The fuel pres-
sure cannot be completely released because this models do not have fuel return system.
JSBIA0597ZZ
: To high pressure fuel pump
: To quick connector
Tightening torque: 1 - 1.5 N·m (0.1 - 0.15 kg
−
m)
PBIB2982E
ECM-136
< BASIC INSPECTION >
[MR20DD]
FUEL PRESSURE CHECK
• Use fuel tube adapter (SST: KV10120000) and fuel pressure gauge (SST: ST19590000) to check fuel
pressure.
4.
Install fuel hose for fuel pressure check to high pressure fuel
pump with hose clamp.
CAUTION:
• Wipe off oil or dirt from hose insertion part using cloth
moistened with gasoline.
• Apply proper amount of gasoline on the hose insertion
part.
• Insert fuel hose for fuel pressure check
until it touches-
the spool
on high pressure fuel pump
.
• Use NISSAN genuine hose clamp
(part number:
16439 N4710 or 16439 40U00).
• Install hose clamp to the hose end position within 1- 2 mm
(0.04 - 0.08 in) and tighten hose clamp to the specified torque.
• After connecting fuel hose for fuel pressure check, pull the hose with a force of approximately
100 N (approximately 10 kg, 22 lb) to confirm fuel sub tube does not come off.
5.
Install fuel pressure check adapter to quick connector of fuel
feed hose.
6.
Turn ignition switch ON and check for fuel leakage.
7.
Start engine and check for fuel leakage.
8.
Read the indication of fuel pressure gauge (A).
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
CHECK FUEL HOSE
Check fuel hose for clogging.
Is the inspection result normal?
YES
>> Repair or replace the malfunctioning part.
NO
>> Replace fuel filter and fuel pump assembly. Refer to
.
Tightening torque: 1 - 1.5 N·m (0.1 - 0.15 kg
−
m)
At idling
: Approximately 500 kPa (5.0 bar,
5.1 kg/cm
2
, 73psi)
JPBIA4923GB
JSBIA1305ZZ
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
ECM-137
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
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DTC/CIRCUIT DIAGNOSIS
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
Description
INFOID:0000000010702871
The specification (SP) value indicates the tolerance of the value that is displayed in “SPEC” of “DATA MONI-
TOR” mode of CONSULT during normal operation of the Engine Control System. When the value in “SPEC” of
“DATA MONITOR” mode is within the SP value, the Engine Control System is confirmed OK. When the value
in “SPEC” of “DATA MONITOR” mode is NOT within the SP value, the Engine Control System may have one
or more malfunctions.
The SP value is used to detect malfunctions that may affect the Engine Control System, but will not light the
MIL.
The SP value will be displayed for the following three items:
• B/FUEL SCHDL (The fuel injection pulse width programmed into ECM prior to any learned on board correc-
tion)
• A/F ALPHA-B1 (The mean value of air-fuel ratio feedback correction factor per cycle)
• MASS AIR FLOW SENSOR (Hz) (The signal frequency of the mass air flow sensor)
Component Function Check
INFOID:0000000010702872
1.
START
Make sure that all of the following conditions are satisfied.
• Vehicle driven distance: More than 5,000 km (3,107 miles)
• Atmospheric pressure: 98.3 - 104.3 kPa (1.003 - 1.064 kg/cm
2
, 14.25 - 15.12 psi)
• Atmospheric temperature: 20 - 30
°
C (68 - 86
°
F)
• Engine coolant temperature: 75 - 95
°
C (167 - 203
°
F)
• Transmission: Warmed-up
- After the engine is warmed up to normal operating temperature, drive vehicle until “ATF TEMP SEN” (CVT
fluid temperature sensor signal) indicates more than 60
°
C (140
°
F).
• Electrical load: Not applied*
• Engine speed: Idle
*: Rear window defogger switch, air conditioner switch, lighting switch are OFF. Steering wheel is straight
ahead.
>> GO TO 2.
2.
PERFORM “SPEC” OF “DATA MONITOR” MODE
With CONSULT
NOTE:
Perform “SPEC” in “DATA MONITOR” mode in maximum scale display.
1.
.
2.
Select “B/FUEL SCHDL”, “A/F ALPHA-B1” and “MASS AIR FLOW SENSOR (Hz)” in “SPEC” of “DATA
MONITOR” mode with CONSULT.
3.
Make sure that monitor items are within the SP value.
Is the inspection result normal?
YES
>> END
NO
>> Proceed to
ECM-138, "Diagnosis Procedure"
.
ECM-138
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
Diagnosis Procedure
INFOID:0000000010702873
OVERALL SEQUENCE
PBIB2318E
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
ECM-139
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
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DETAILED PROCEDURE
1.
CHECK “A/F ALPHA-B1”
With CONSULT
1.
Start engine.
2.
Confirm that the testing conditions are met. Refer to
ECM-137, "Component Function Check"
3.
Select “A/F ALPHA-B1” in “SPEC” of “DATA MONITOR” mode, and make sure that the each indication is
within the SP value.
PBIB3213E
ECM-140
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
NOTE:
Check “A/F ALPHA-B1” for approximately 1 minute because they may fluctuate. It is NG if the indication is
out of the SP value even a little.
Is the measurement value within the SP value?
YES
>> GO TO 17.
NO-1
>> Less than the SP value: GO TO 2.
NO-2
>> More than the SP value: GO TO 3.
2.
CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and make sure that the indication is within the
SP value.
Is the measurement value within the SP value?
YES
>> GO TO 4.
NO
>> More than the SP value: GO TO 19.
3.
CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and make sure that the indication is within the
SP value.
Is the measurement value within the SP value?
YES
>> GO TO 6.
NO-1
>> More than the SP value: GO TO 6.
NO-2
>> Less than the SP value: GO TO 25.
4.
CHECK “A/F ALPHA-B1”
1.
Stop the engine.
2.
Disconnect PCV hose, and then plug it.
3.
Start engine.
4.
Select “A/F ALPHA-B1” in “SPEC” of “DATA MONITOR” mode, and make sure that the indication is within
the SP value.
Is the measurement value within the SP value?
YES
>> GO TO 5.
NO
>> GO TO 6.
5.
CHANGE ENGINE OIL
1.
Stop the engine.
2.
Change engine oil.
NOTE:
This symptom may occur when a large amount of gasoline is mixed with engine oil because of driving
conditions (such as when engine oil temperature does not rise enough since a journey distance is too
short during winter). The symptom will not be detected after changing engine oil or changing driving con-
dition.
>> INSPECTION END
6.
CHECK FUEL PRESSURE
Check fuel pressure. (Refer to
.)
Is the inspection result normal?
YES
>> GO TO 9.
NO-1
>> Fuel pressure is too high: Replace “fuel filter and fuel pump assembly”, refer to
, and then GO TO 8.
NO-2
>> Fuel pressure is too low: GO TO 7.
7.
DETECT MALFUNCTIONING PART
Check fuel hoses and fuel tubes for clogging
Is the inspection result normal?
YES
>> Replace “fuel filter and fuel pump assembly”, refer to
FL-19, "Removal and Installation"
GO TO 8.
NO
>> Repair or replace and then GO TO 8.
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
ECM-141
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
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8.
CHECK “A/F ALPHA-B1”
1.
Start engine.
2.
Select “A/F ALPHA-B1” in “SPEC” of “DATA MONITOR” mode, and make sure that the indication is within
the SP value.
Is the measurement value within the SP value?
YES
>> INSPECTION END
NO
>> GO TO 9.
9.
PERFORM POWER BALANCE TEST
1.
Perform “POWER BALANCE” in “ACTIVE TEST” mode.
2.
Make sure that the each cylinder produces a momentary engine speed drop.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> GO TO 10.
10.
DETECT MALFUNCTIONING PART
Check the following.
1.
Ignition coil and its circuit (Refer to
ECM-385, "Component Function Check"
2.
Fuel injector and its circuit (Refer to
ECM-372, "Component Function Check"
3.
Intake air leakage
4.
Low compression pressure (Refer to
Is the inspection result normal?
YES
>> Replace fuel injector, refer to
EM-164, "Removal and Installation"
, and then GO TO 11.
NO
>> Repair or replace malfunctioning part and then GO TO 11.
11.
CHECK “A/F ALPHA-B1”
1.
Start engine.
2.
Select “A/F ALPHA-B1” in “SPEC” of “DATA MONITOR” mode, and make sure that the indication is within
the SP value.
Is the measurement value within the SP value?
YES
>> INSPECTION END
NO
>> GO TO 12.
12.
CHECK A/F SENSOR 1 FUNCTION
Perform all DTC CONFIRMATION PROCEDURE related with A/F sensor 1.
• For DTC P0130, refer to
.
• For DTC P0131, refer to
.
• For DTC P0132, refer to
.
• For DTC P014C, P014D, refer to
.
Is any DTC detected?
YES
>> GO TO 15.
NO
>> GO TO 13.
13.
CHECK A/F SENSOR 1 CIRCUIT
Perform DIAGNOSTIC PROCEDURE according to corresponding DTC.
>> GO TO 14.
14.
CHECK “A/F ALPHA-B1”
1.
Start engine.
2.
Select “A/F ALPHA-B1” in “SPEC” of “DATA MONITOR” mode, and make sure that the each indication is
within the SP value.
Is the measurement value within the SP value?
YES
>> INSPECTION END
NO
>> GO TO 15.
15.
DISCONNECT AND RECONNECT ECM HARNESS CONNECTOR
ECM-142
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
1.
Stop the engine.
2.
Disconnect ECM harness connector. Check pin terminal and connector for damage, and then reconnect it.
>> GO TO 16.
16.
CHECK “A/F ALPHA-B1”
1.
Start engine.
2.
Select “A/F ALPHA-B1” in “SPEC” of “DATA MONITOR” mode, and make sure that the indication is within
the SP value.
Is the measurement value within the SP value?
YES
>> INSPECTION END
NO
>> Detect malfunctioning part according to
.
17.
CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and make sure that the indication is within the
SP value.
Is the measurement value within the SP value?
YES
>> INSPECTION END
NO-1
>> More than the SP value: GO TO 18.
NO-2
>> Less than the SP value: GO TO 25.
18.
DETECT MALFUNCTIONING PART
1.
Check for the cause of large engine friction. Refer to the following.
-
Engine oil level is too high
-
Engine oil viscosity
-
Belt tension of power steering, alternator, A/C compressor, etc. is excessive
-
Noise from engine
-
Noise from transmission, etc.
2.
Check for the cause of insufficient combustion. Refer to the following.
-
Valve clearance malfunction
-
Intake valve timing control function malfunction
-
Camshaft sprocket installation malfunction, etc.
>> Repair or replace malfunctioning part, and then GO TO 30.
19.
CHECK INTAKE SYSTEM
Check for the cause of uneven air flow through mass air flow sensor. Refer to the following.
• Crushed air ducts
• Malfunctioning seal of air cleaner element
• Uneven dirt of air cleaner element
• Improper specification of intake air system
Is the inspection result normal?
YES
>> GO TO 21.
NO
>> Repair or replace malfunctioning part, and then GO TO 20.
20.
CHECK “A/F ALPHA-B1”, AND “B/FUEL SCHDL”
Select “A/F ALPHA-B1” and “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and make sure that the
each indication is within the SP value.
Is the measurement value within the SP value?
YES
>> INSPECTION END
NO
>> “B/FUEL SCHDL” is more, “A/F ALPHA-B1” is less than the SP value: GO TO 21.
21.
DISCONNECT AND RECONNECT MASS AIR FLOW SENSOR HARNESS CONNECTOR
1.
Stop the engine.
2.
Disconnect mass air flow sensor harness connector. Check pin terminal and connector for damage and
then reconnect it again.
>> GO TO 22.
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
ECM-143
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
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22.
CHECK “A/F ALPHA-B1”
1.
Start engine.
2.
Select “A/F ALPHA-B1” in “SPEC” of “DATA MONITOR” mode, and make sure that the indication is within
the SP value.
Is the measurement value within the SP value?
YES
>> Detect malfunctioning part of mass air flow sensor circuit and repair it. Refer to
. Then GO TO 29.
NO
>> GO TO 23.
23.
CHECK “MASS AIR FLOW SENSOR (HZ)”
Select “MASS AIR FLOW SENSOR (Hz)” in “SPEC” of “DATA MONITOR” mode, and make sure that the indi-
cation is within the SP value.
Is the measurement value within the SP value?
YES
>> GO TO 24.
NO
>> More than the SP value: Replace mass air flow sensor, refer to
EM-147, "Removal and Installa-
, and then GO TO 29.
24.
REPLACE ECM
ECM-416, "Removal and Installation"
>> GO TO 29.
25.
CHECK INTAKE SYSTEM
Check for the cause of uneven air flow through mass air flow sensor. Refer to the following.
• Crushed air ducts
• Malfunctioning seal of air cleaner element
• Uneven dirt of air cleaner element
• Improper specification of intake air system
Is the inspection result normal?
YES
>> GO TO 27.
NO
>> Repair or replace malfunctioning part, and then GO TO 26.
26.
CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and make sure that the indication is within the
SP value.
Is the measurement value within the SP value?
YES
>> INSPECTION END
NO
>> Less than the SP value: GO TO 27.
27.
CHECK “MASS AIR FLOW SENSOR (HZ)”
Select “MASS AIR FLOW SENSOR (Hz)” in “SPEC” of “DATA MONITOR” mode, and make sure that the indi-
cation is within the SP value.
Is the measurement value within the SP value?
YES
>> GO TO 28.
NO
>> Less than the SP value: Replace mass air flow sensor, refer to
EM-147, "Removal and Installa-
, and then GO TO 30.
28.
CHECK INTAKE SYSTEM
Check for the cause of air leak after the mass air flow sensor. Refer to the following.
• 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
ECM-144
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
• Malfunctioning seal of intake air system, etc.
>> GO TO 30.
29.
CHECK “A/F ALPHA-B1” AND “B/FUEL SCHDL”
Select “A/F ALPHA-B1” and “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and make sure that the
indication is within the SP value.
Is the measurement value within the SP value?
YES
>> INSPECTION END
NO
>> Detect malfunctioning part according to
.
30.
CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and then make sure that the indication is
within the SP value.
Is the measurement value within the SP value?
YES
>> INSPECTION END
NO
>> Detect malfunctioning part according to
.
POWER SUPPLY AND GROUND CIRCUIT
ECM-145
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
C
D
E
F
G
H
I
J
K
L
M
A
ECM
N
P
O
POWER SUPPLY AND GROUND CIRCUIT
Diagnosis Procedure
INFOID:0000000010702874
1.
CHECK FUSE
1.
Turn ignition switch OFF.
2.
Check that the following fuse is not fusing.
Is the fuse fusing?
YES
>> Replace the fuse. (Check the power supply if it fuses again.)
NO
>> Go to 2.
2.
CHECK GROUND CONNECTION
Check ground connection E4 and E5. Refer to
.
Is the inspection result normal?
YES
>> Go to 3.
NO
>> Repair or replace ground connection.
3.
CHECK ECM GROUND CIRCUIT
1.
Disconnect ECM harness connector.
2.
Check the continuity between ECM harness connector and ground.
3.
Also check harness for short to power.
Is the inspection result normal?
YES
>> Go to 4.
NO
>> Repair or replace malfunctioning part.
4.
CHECK ECM POWER SUPPLY-1
1.
Reconnect ECM harness connector.
2.
Turn ignition switch ON.
3.
Check the voltage between ECM harness connector and ground.
Is the inspection result normal?
Location
Fuse No.
Capacity
IPDM E/R
#52
15 A
#65
5 A
+
Ground
Continuity
ECM
Connector
Terminal
F15
11
Ground
Existed
F16
54
55
56
62
E57
123
125
128
ECM
Voltage
(Approx.)
Connector
+
−
Terminal
E57
121
128
Battery voltage
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