Nissan Xterra. Instruction — part 248
EC-118
< BASIC INSPECTION >
[VQ40DE]
INSPECTION AND ADJUSTMENT
INSPECTION AND ADJUSTMENT
Basic Inspection
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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.
-
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. Check 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
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INSPECTION AND ADJUSTMENT
EC-119
< BASIC INSPECTION >
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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.
EC-122, "Idle Speed and Ignition Timing Check"
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.
EC-122, "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-125, "Accelerator Pedal Released Position Learning"
.
>> GO TO 5.
5.
PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform
EC-125, "Throttle Valve Closed Position Learning"
.
>> GO TO 6.
6.
PERFORM IDLE AIR VOLUME LEARNING
EC-125, "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.
EC-122, "Idle Speed and Ignition Timing Check"
PBIA8513J
M/T: 625
± 50 rpm (in Neutral position)
A/T: 625
± 50 rpm (in P or N position)
M/T: 625
± 50 rpm (in Neutral position)
A/T: 625
± 50 rpm (in P or N position)
M/T: 625
± 50 rpm (in Neutral position)
A/T: 625
± 50 rpm (in P or N position)
EC-120
< BASIC INSPECTION >
[VQ40DE]
INSPECTION AND ADJUSTMENT
Without CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Check idle speed.
EC-122, "Idle Speed and Ignition Timing Check"
OK or NG
OK
>> GO TO 10.
NG
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART
Check the following.
• Check camshaft position sensor (PHASE) and circuit. Refer to
.
• Check crankshaft position sensor (POS) and circuit. Refer to
OK or NG
OK
>> GO TO 9.
NG
>> 1. Repair or replace.
2. GO TO 4.
9.
CHECK ECM FUNCTION
1. Substitute with non-malfunctioning ECM to check ECM function. (ECM may be the cause of the incident,
although this is rare.)
2. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to
SEC-7, "ECM RE-COMMUNICATING FUNCTION : Special Repair Requirement"
.
>> GO TO 4.
10.
CHECK IGNITION TIMING
1. Run engine at idle.
2. Check ignition timing with a timing light.
EC-122, "Idle Speed and Ignition Timing Check"
OK or NG
OK
>> GO TO 19.
NG
>> GO TO 11.
11.
PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
1. Stop engine.
2. Perform
EC-125, "Accelerator Pedal Released Position Learning"
>> GO TO 12.
12.
PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform
EC-125, "Throttle Valve Closed Position Learning"
.
>> GO TO 13.
13.
PERFORM IDLE AIR VOLUME LEARNING
EC-125, "Idle Air Volume Learning"
Is Idle Air Volume Learning carried out successfully?
M/T: 625
± 50 rpm (in Neutral position)
A/T: 625
± 50 rpm (in P or N position)
M/T: 15
± 5° BTDC (in Neutral position)
A/T: 15
± 5° BTDC (in P or N position)
BBIA0531E
INSPECTION AND ADJUSTMENT
EC-121
< BASIC INSPECTION >
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Yes or No
Yes
>> GO TO 14.
No
>> 1. Follow the instruction of Idle Air Volume Learning.
2. GO TO 4.
14.
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.
EC-122, "Idle Speed and Ignition Timing Check"
Without CONSULT
1. Start engine and warm it up to normal operating temperature.
EC-122, "Idle Speed and Ignition Timing Check"
OK or NG
OK
>> GO TO 15.
NG
>> GO TO 17.
15.
CHECK IGNITION TIMING AGAIN
1. Run engine at idle.
2. Check ignition timing with a timing light.
EC-122, "Idle Speed and Ignition Timing Check"
OK or NG
OK
>> GO TO 19.
NG
>> GO TO 16.
16.
CHECK TIMING CHAIN INSTALLATION
Check timing chain installation. Refer to
OK or NG
OK
>> GO TO 17.
NG
>> 1. Repair the timing chain installation.
2. GO TO 4.
17.
DETECT MALFUNCTIONING PART
Check the following.
• Check camshaft position sensor (PHASE) and circuit. Refer to
• Check crankshaft position sensor (POS) and circuit. Refer to
OK or NG
OK
>> GO TO 18.
NG
>> 1. Repair or replace.
2. GO TO 4.
18.
CHECK ECM FUNCTION
1. Substitute with non-malfunctioning ECM to check ECM function. (ECM may be the cause of the incident,
although this is rare.)
M/T: 625
± 50 rpm (in Neutral position)
A/T: 625
± 50 rpm (in P or N position)
M/T: 625
± 50 rpm (in Neutral position)
A/T: 625
± 50 rpm (in P or N position)
M/T: 15
± 5° BTDC (in Neutral position)
A/T: 15
± 5° BTDC (in P or N position)
BBIA0531E
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