Nissan Sentra. Instruction — part 378
EC-208
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
P0128 THERMOSTAT FUNCTION
Drive the vehicle under the conditions instructed below until the difference between “COOLANT TEMP/S”
and “FUEL T/TMP SE” becomes at least 26
°C (47°F).
*: Example
-
STEP 2
Drive the vehicle at 50 km/h (32 MPH) or more with the difference between “COOLANT TEMP/S” and “FUEL
T/TMP SE” maintained at 26
°C (47°F) or more.
NOTE:
Keep the accelerator pedal as steady as possible during cruising.
-
STEP 3
Drive the vehicle at 50 km/h (32 MPH) or more until “COOLANT TEMP/S” increases by 6
°C (11°F).
NOTE:
Keep the accelerator pedal as steady as possible during cruising.
Is the condition satisfied?
YES
>> GO TO 4.
NO
>> GO TO 1.
4.
PERFORM DTC CONFIRMATION PROCEDURE-2
With CONSULT
1. Drive the vehicle until the following condition is satisfied.
CAUTION:
Always drive vehicle at safe speed.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009758473
1.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
Check the engine coolant temperature sensor. Refer to
EC-208, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace engine coolant temperature sensor. Refer to
2.
CHECK THERMOSTAT
Check the thermostat. Refer to
CO-21, "Removal and Installation of Thermostat"
.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace thermostat.
Component Inspection
INFOID:0000000009758474
1.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
COOLANT TEMP/S
66
°C (151°F) or less
FUEL T/TMP SE
Less than the value calculated by sub-
tracting 26
°C (47°F) from “COOLANT
TEMP/S”.*
COOLANT TEMP/S
FUEL T/TMP SE
70
°C (158°F)
44
°C (111°F) or less
65
°C (149°F)
39
°C (102°F) or less
60
°C (140°F)
34
°C (93°F) or less
COOLANT TEMP/S
67
°C (153°F) or more
P0128 THERMOSTAT FUNCTION
EC-209
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
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1. Turn ignition switch OFF.
2. Disconnect engine coolant temperature sensor harness connector.
3. Remove engine coolant temperature sensor.
4. Check resistance between engine coolant temperature sensor
terminals by heating with hot water as shown in the figure.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace engine coolant temperature sensor. Refer to
Engine coolant tem-
perature sensor
Condition
Resistance (k
Ω)
+
−
Terminal
1
2
Temperature [
°C
(
°F)]
20 (68)
2.37 - 2.63
50 (122)
0.68 - 1.00
90 (194)
0.236 - 0.260
JMBIA0080ZZ
EC-210
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
P0130 A/F SENSOR 1
P0130 A/F SENSOR 1
DTC Logic
INFOID:0000000009758475
DTC DETECTION LOGIC
To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the A/F sensor 1
signal fluctuates according to fuel feedback control.
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A
With CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Let it idle for 2 minutes.
3. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO-1 ( With CONSULT)>>GO TO 3.
NO-2 ( Without CONSULT)>>GO TO 7.
3.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 FUNCTION
1. Select “A/F SEN1 (B1)” in “DATA MONITOR” mode of “ENGINE” using CONSULT.
2. Check “A/F SEN1 (B1)” indication.
Does the indication fluctuates around 2.2 V?
YES
>> GO TO 4.
NO
>> Proceed to
.
4.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B-1
1. Select “A/F SEN1 (B1) P1276” of “A/F SEN1” in “DTC WORK SUPPORT” mode of “ENGINE” using CON-
SULT.
2. Touch “START”.
3. When the following conditions are met, “TESTING” will be displayed on the CONSULT screen.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P0130
A/F SENSOR1 (B1)
(O2 sensor circuit bank 1
sensor 1)
A)
The A/F signal computed by ECM from the A/F
sensor 1 signal is constantly in the range other
than approx. 2.2 V.
• Harness or connectors
(A/F sensor 1 circuit is open or
shorted.)
• A/F sensor 1
B)
The A/F signal computed by ECM from the A/F
sensor 1 signal is constantly approx. 2.2 V.
ENG SPEED
1,000 - 3,200 rpm
VHCL SPEED SE
More than 64 km/h (40 mph)
B/FUEL SCHDL
1.0 - 8.0 msec
Selector lever
D position (CVT)
5th position (6MT)
P0130 A/F SENSOR 1
EC-211
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
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If “TESTING” is not displayed after 20 seconds, retry from step 2.
CAUTION:
Always drive vehicle at a safe speed.
Is “TESTING” displayed on CONSULT screen?
YES
>> GO TO 5.
NO
>> 1. Check A/F sensor 1 function again.
2. GO TO 3.
5.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B-2
Release accelerator pedal fully.
NOTE:
Never apply brake during releasing the accelerator pedal.
Which does “TESTING” change to?
COMPLETED>>GO TO 6.
OUT OF CONDITION>>1.Retry DTC CONFIRMATION PROCEDURE.
2. GO TO 4.
6.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B-3
Touch “SELF-DIAG RESULT”
Which is displayed on CONSULT screen?
YES
>> INSPECTION END
NO
>> Proceed to
.
7.
PERFORM COMPONENT FUNCTION CHECK FOR MALFUNCTION B
Perform Component Function Check. Refer to
EC-211, "Component Function Check"
NOTE:
Use component function check to check the overall function of the A/F sensor 1 circuit. During this check, a
1st trip DTC might not be confirmed.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
.
Component Function Check
INFOID:0000000009758476
1.
PERFORM COMPONENT FUNCTION CHECK
With GST
1. Start engine and warm it up to normal operating temperature.
2. Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minutes in the suitable gear position.
3. Shift the selector lever to the D position (CVT) or 5th position (M/T), then release the accelerator pedal
fully until the vehicle speed decreases to 50 km/h (31 MPH).
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
Never apply brake during releasing the accelerator pedal.
4. Repeat steps 2 to 3 for five times.
5. Stop the vehicle and turn ignition switch OFF.
6. Wait at least 10 seconds and restart engine.
7. Repeat steps 2 to 3 for five times.
8. Stop the vehicle.
9. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009758477
1.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY
1. Turn ignition switch OFF.
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