Nissan Frontier. Instruction — part 400
P0102, P0103 MAF SENSOR
EC-171
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
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With CONSULT
1. Reconnect all harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
3. Connect CONSULT and select “DATA MONITOR” mode.
4. Select “MAS A/F SE-B1” and check indication under the following conditions.
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
5. If the voltage is out of specification, proceed the following.
a. Check for the cause of uneven air flow through mass air flow sensor. Refer to following.
• Crushed air ducts
• Malfunctioning seal of air cleaner element
• Uneven dirt of air cleaner element
• Improper specification of intake air system parts
b. If NG, repair or replace malfunctioning part and perform step 2 to 4 again.
If OK, go to next step.
6. Turn ignition switch OFF.
7. Disconnect mass air flow sensor harness connector and reconnect it again.
8. Perform step 2 to 4 again.
9. If NG, clean or replace mass air flow sensor.
Without CONSULT
1. Reconnect all harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
3. Check voltage between ECM terminal 58 (Mass air flow sensor signal) and ground.
*: Check for linear voltage rise in response to engine being increased to about 4,000 rpm.
4. If the voltage is out of specification, proceed the following.
a. Check for the cause of uneven air flow through mass air flow sensor. Refer to following.
• Crushed air ducts
• Malfunctioning seal of air cleaner element
• Uneven dirt of air cleaner element
• Improper specification of intake air system parts
b. If NG, repair or replace malfunctioning part and perform step 2 and 3 again.
If OK, go to next step.
5. Turn ignition switch OFF.
6. Disconnect mass air flow sensor harness connector and reconnect it again.
7. Perform step 2 and 3 again.
8. If NG, clean or replace mass air flow sensor.
Condition
MAS A/F SE-B1 (V)
Ignition switch ON (Engine stopped.)
Approx. 0.4
Idle (Engine is warmed-up to normal
operating temperature.)
0.9 - 1.2
2,500 rpm (Engine is warmed-up to
normal operating temperature.)
1.5 - 1.9
Idle to about 4,000 rpm
0.9 - 1.2 to Approx. 2.4*
Condition
Voltage (V)
Ignition switch ON (Engine stopped.)
Approx 0.4
Idle (Engine is warmed-up to normal
operating temperature.)
0.9 - 1.2
2,500 rpm (Engine is warmed-up to
normal operating temperature.)
1.5 - 1.9
Idle to about 4,000 rpm
0.9 - 1.2 to Approx. 2.4*
EC-172
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
P0111 IAT SENSOR
P0111 IAT SENSOR
Component Description
INFOID:0000000009480811
The intake air temperature sensor is built-into the mass air flow sen-
sor (1). The sensor detects intake air temperature and transmits a
signal to the ECM.
The temperature sensing unit uses a thermistor which is sensitive to
the change in temperature. Electrical resistance of the thermistor
decreases in response to the rise in temperature.
<Reference data>
*: These data are reference values and are measured between ECM terminals 50
(Intake air temperature sensor) and 56 (Sensor ground).
On Board Diagnosis Logic
INFOID:0000000009480812
DTC Confirmation Procedure
INFOID:0000000009480813
1.
INSPECTION START
Is it necessary to erase permanent DTC?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
PERFORM COMPONENT FUNCTION CHECK
Perform component function check. Refer to
EC-173, "Component Function Check"
NOTE:
Use the component function check to check the overall function of the IAT sensor circuit. During this check, a
1st trip DTC might not be confirmed.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
.
PBIA9559J
Intake air temperature
[
°C (°F)]
Voltage* (V)
Resistance (k
Ω)
25 (77)
3.3
1.800 - 2.200
80 (176)
1.2
0.283 - 0.359
SEF012P
DTC No.
Trouble diagnosis
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P0111
IAT SENSOR 1 B1
[Intake air temperature (IAT)
sensor circuit range/perfor-
mance]
The comparison result of signals transmitted
to ECM from each temperature sensor (IAT
sensor, ECT sensor, and FTT sensor) shows
that the voltage signal of the IAT sensor is
higher/lower than that of other temperature
sensors when the engine is started with its
cold state.
• Harness or connectors
(High or low resistance in the IAT sen-
sor circuit)
• IAT sensor
P0111 IAT SENSOR
EC-173
< DTC/CIRCUIT DIAGNOSIS >
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3.
PRECONDITIONING
If DTC CONFIRMATION PROCEDURE has been previously conducted, always perform the following proce-
dure 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, do not add fuel.
• Before performing the following procedure, check that fuel level is between 1/4 and 4/4.
• Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.
>> GO TO 4.
4.
PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 60 minutes.
2. Move the vehicle to a cool place.
NOTE:
Cool the vehicle in an environment of ambient air temperature between
−10°C (14°F) and 35°C (95°F).
3. Turn ignition switch OFF and soak the vehicle for 12 hours.
CAUTION:
Never turn ignition switch ON during soaking.
NOTE:
The vehicle must be cooled with the food open.
4. Start engine and let it idle for 5 minutes or more.
CAUTION:
Never turn ignition switch OFF during idling.
5. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Component Function Check
INFOID:0000000009480814
1.
CHECK INTAKE AIR TEMPERATURE (IAT) SENSOR
1. Turn ignition switch OFF.
2. Disconnect mass air flow sensor harness connector.
3. Check resistance between mass air flow sensor terminals as follows.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Proceed to
.
2.
CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to
GI-42, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
.
Diagnosis Procedure
INFOID:0000000009480815
1.
CHECK INTAKE AIR TEMPERATURE (IAT) SENSOR
Check intake air temperature sensor. Refer to
EC-174, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 2.
Terminals
Condition
Resistance (k
Ω)
5 and 6
Temperature [
°C (°F)]
25 (77)
1.800 – 2.200
EC-174
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
P0111 IAT SENSOR
NO
>> Replace mass air flow sensor (with intake air temperature sensor). Refer to
2.
CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to
GI-42, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000009480816
1.
CHECK INTAKE AIR TEMPERATURE (IAT) SENSOR
1. Turn ignition switch OFF.
2. Disconnect mass air flow sensor harness connector.
3. Check resistance between mass air flow sensor terminals as follows.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace mass air flow sensor (with intake air temperature sensor). Refer to
Terminals
Condition
Resistance (k
Ω)
5 and 6
Temperature [
°C (°F)]
25 (77)
1.800 – 2.200
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