Nissan Frontier. Manual — part 386
DIAGNOSIS AND REPAIR WORK FLOW
EC-115
< BASIC INSPECTION >
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Are they within the SP value?
YES
>> GO TO 9.
NO
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART BY TROUBLE DIAGNOSIS - SPECIFICATION VALUE
Detect malfunctioning part according to
.
Is a malfunctioning part detected?
YES
>> GO TO 11.
NO
>> GO TO 9.
9.
DETECT MALFUNCTIONING SYSTEM BY SYMPTOM MATRIX CHART
Detect malfunctioning system according to
EC-461, "Symptom Matrix Chart"
based on the confirmed symptom
in step 4, and determine the trouble diagnosis order based on possible causes and symptoms.
>> GO TO 10.
10.
DETECT MALFUNCTIONING PART BY DIAGNOSTIC PROCEDURE
Inspect according to Diagnostic Procedure of the system.
NOTE:
The Diagnostic Procedure in EC section described based on open circuit inspection. A short circuit inspection
is also required for the circuit check in the Diagnostic Procedure. For details, refer to Circuit Inspection in
Is a malfunctioning part detected?
YES
>> GO TO 11.
NO
>> Monitor input data from related sensors or check voltage of related ECM terminals using CON-
SULT. Refer to
EC-68, "CONSULT Reference Value in Data Monitor Mode"
,
.
11.
REPAIR OR REPLACE THE MALFUNCTIONING PART
1. Repair or replace the malfunctioning part.
2. Reconnect parts or connectors disconnected during Diagnostic Procedure again after repair and replace-
ment.
3. Check DTC. If DTC is displayed, erase it, refer to
.
>> GO TO 12.
12.
FINAL CHECK
When DTC was detected in step 2, perform DTC Confirmation Procedure or Overall Function Check again,
and then make sure that the malfunction have been completely repaired.
When symptom was described from the customer, refer to confirmed symptom in step 3 or 4, and make sure
that the symptom is not detected.
Is DTC detected and does symptom remain?
YES-1 (DTC is detected)>>GO TO 10.
YES-2 (Symptom remains)>>GO TO 6.
NO-1 (No request for I/M examination from the customer)>>Before returning the vehicle to the customer,
always erase unnecessary DTC in ECM and TCM (Transmission Control Module).
NO-2 (I/M examination, requested from the customer)>>GO TO 13.
13.
PREPARE FOR I/M EXAMINATION
1. Set SRT codes. Refer to
2. Erase permanent DTCs. Refer to
.
>> INSPECTION END
DIAGNOSTIC WORKSHEET
Description
EC-116
< BASIC INSPECTION >
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DIAGNOSIS AND REPAIR WORK FLOW
There are many operating conditions that lead to the malfunction of
engine components. A good grasp of such conditions can make trou-
bleshooting faster and more accurate.
In general, each customer feels differently about an incident. It is
important to fully understand the symptoms or conditions for a cus-
tomer complaint.
Utilize a diagnostic worksheet like the one on the next page in order
to organize all the information for troubleshooting.
Some conditions may cause the MIL to come on steady or blink, and
DTC to be detected. Examples:
• Vehicle ran out of fuel, which caused the engine to misfire.
• Fuel filler cap was left off or incorrectly screwed on, allowing fuel to
evaporate into the atmosphere.
Worksheet Sample
SEF907L
MTBL0017
INSPECTION AND ADJUSTMENT
EC-117
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INSPECTION AND ADJUSTMENT
Basic Inspection
INFOID:0000000009480755
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 leakage
-
Air cleaner clogging
-
Gasket
3. Check that electrical or mechanical loads are not applied.
-
Headlamp switch is OFF.
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Air conditioner switch is OFF.
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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 GST.
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.
2.
REPAIR OR REPLACE
Repair or replace components as necessary according to corresponding Diagnostic Procedure.
>> GO TO 3.
3.
CHECK TARGET IDLE SPEED
With CONSULT
1. Run engine at about 2,000 rpm for about 2 minutes under no load.
SEF983U
SEF976U
SEF977U
EC-118
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INSPECTION AND ADJUSTMENT
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. Read idle speed in “DATA MONITOR” mode with CONSULT. Refer to
EC-121, "Idle Speed and Ignition
Without CONSULT
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. Refer to
EC-121, "Idle Speed and Ignition Timing Check"
.
OK or NG
OK
>> GO TO 10.
NG
>> GO TO 4.
4.
PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1. Stop engine.
2. Perform
EC-123, "Accelerator Pedal Released Position Learning"
>> GO TO 5.
5.
PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform
EC-123, "Throttle Valve Closed Position Learning"
.
>> GO TO 6.
6.
PERFORM IDLE AIR VOLUME LEARNING
EC-124, "Idle Air Volume Learning"
Is Idle Air Volume Learning carried out successfully?
Yes or No
Yes
>> GO TO 7.
No
>> 1. Follow the instruction of Idle Air Volume Learning.
2. GO TO 4.
7.
CHECK TARGET IDLE SPEED AGAIN
With CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Read idle speed in “DATA MONITOR” mode with CONSULT. Refer to
EC-121, "Idle Speed and Ignition
PBIA8513J
M/T: 625
± 50 rpm (in Neutral position)
A/T: 700
± 50 rpm (in P or N position)
M/T: 625
± 50 rpm (in Neutral position)
A/T: 700
± 50 rpm (in P or N position)
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