Nissan Frontier. Instruction — part 399
P0101 MAF SENSOR
EC-167
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
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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-168
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
P0102, P0103 MAF SENSOR
P0102, P0103 MAF SENSOR
Component Description
INFOID:0000000009480806
The mass air flow sensor (1) is placed in the stream of intake air. It
measures the intake flow rate by measuring a part of the entire
intake flow. The mass air flow sensor controls the temperature of the
hot wire to a certain amount. The heat generated by the hot wire is
reduced as the intake air flows around it. The more air, the greater
the heat loss.
Therefore, the electric current supplied to hot wire is changed to
maintain the temperature of the hot wire as air flow increases. The
ECM detects the air flow by means of this current change.
On Board Diagnosis Logic
INFOID:0000000009480807
These self-diagnoses have the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
DTC Confirmation Procedure
INFOID:0000000009480808
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
PROCEDURE FOR DTC P0102
With CONSULT
1. Start engine and wait at least 5 seconds.
2. Check DTC.
3. If DTC is detected, go to
.
With GST
Follow the procedure “With CONSULT” above.
PROCEDURE FOR DTC P0103
With CONSULT
1. Turn ignition switch ON.
2. Wait at least 5 seconds.
3. Check DTC.
4. If DTC is detected, go to
.
If DTC is not detected, go to next step.
5. Start engine and wait at least 5 seconds.
6. Check DTC.
PBIA9559J
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
P0102
0102
Mass air flow sensor
circuit low input
An excessively low voltage from the sensor is sent
to ECM.
• Harness or connectors
(The sensor circuit is open or shorted.)
• Intake air leaks
• Mass air flow sensor
P0103
0103
Mass air flow sensor
circuit high input
An excessively high voltage from the sensor is
sent to ECM.
• Harness or connectors
(The sensor circuit is open or shorted.)
• Mass air flow sensor
Detected items
Engine operating condition in fail-safe mode
Mass air flow sensor circuit
Engine speed will not rise more than 2,400 rpm due to the fuel cut.
P0102, P0103 MAF SENSOR
EC-169
< DTC/CIRCUIT DIAGNOSIS >
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7. If DTC is detected, go to
.
With GST
Follow the procedure “With CONSULT” above.
Diagnosis Procedure
INFOID:0000000009480809
1.
INSPECTION START
Which malfunction (P0102 or P0103) is duplicated?
P0102 or P0103
P0102 >> GO TO 2.
P0103 >> GO TO 3.
2.
CHECK INTAKE SYSTEM
Check the following for connection.
• Air duct
• Vacuum hoses
• Intake air passage between air duct and intake manifold
OK or NG
OK
>> GO TO 3.
NG
>> Reconnect the parts.
3.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws on the body. Refer to
.
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace ground connections.
4.
CHECK MAF SENSOR POWER SUPPLY CIRCUIT
1. Disconnect mass air flow (MAF) sensor harness connector.
2. Turn ignition switch ON.
BBIA0614E
BBIA0622E
EC-170
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
P0102, P0103 MAF SENSOR
3. Check voltage between MAF sensor terminal 2 and ground with
CONSULT or tester.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E2, F32
• Harness for open or short between IPDM E/R and mass air flow sensor
• Harness for open or short between mass air flow sensor and ECM
>> Repair open circuit, short to ground or short to power in harness or connectors.
6.
CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between MAF sensor terminal 3 and ECM terminal 56.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 7.
NG
>> Repair open circuit, short to ground or short to power in harness or connectors.
7.
CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between MAF sensor terminal 4 and ECM terminal 58.
Refer to Wiring Diagram.
2. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 8.
NG
>> Repair open circuit, short to ground or short to power in harness or connectors.
8.
CHECK MASS AIR FLOW SENSOR
EC-170, "Component Inspection"
OK or NG
OK
>> GO TO 9.
NG
>> Replace mass air flow sensor. Refer to
.
9.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000009480810
MASS AIR FLOW SENSOR
Voltage: Battery voltage
PBIB1168E
Continuity should exist.
Continuity should exist.
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