MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [AJ] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513)
BME014013215203
-
Note
-
• Perform the following test only when directed.
MAF Sensor Voltage Inspection
1. Turn the ignition switch to LOCK.
2. Connect the WDS or equivalent to the DLC-2.
3. Turn the ignition switch to ON position (Engine OFF).
4. Select MAF PID on the WDS or equivalent.
5. Verify that MAF PID is within the specification.
-
• If not as specified, perform the "MAF Sensor Circuit Open/Short Inspection".
Specification
-
0.0-0.1 V
6. Turn the ignition switch to START and warm up the engine completely.
7. Verify that MAF PID is within the specification.
-
• If not as specified, perform the "MAF Sensor Circuit Open/Short Inspection".
Specification
-
0.5-0.8 V
MAF Sensor Circuit Open/Short Inspection
1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [AJ].)
2. Inspect the following wiring harness for open or short (Continuity check).
Open circuit
-
• If there is no continuity, the circuit is open. Repair or replace the harness.
-
- MAF/IAT sensor terminal B (harness-side) and main relay terminal C (harness-side)
-
- MAF/IAT sensor terminal E (harness-side) and PCM terminal 88
-
- MAF/IAT sensor terminal D (harness-side) and PCM terminal 36
Short circuit
-
• If there is continuity, the circuit is shorted. Repair or replace the harness.
-
- MAF/IAT sensor terminal B (harness-side) and body ground
-
- MAF/IAT sensor terminal E (harness-side) and power supply
-
- MAF/IAT sensor terminal E (harness-side) and body ground
-
- MAF/IAT sensor terminal D (harness-side) and power supply
-
- MAF/IAT sensor terminal D (harness-side) and body ground
MAF Rate and Load Value
-
Note
-
• The scan tool shows the MAF rate and load value.
Specification
|
item
|
Intake MAF (g/s)
|
Engine load calculated value (%)
|
|
Idle*1
|
3.3-4.7
|
18-20
|
|
Engine speed 2,500 rpm*2
|
12.1-15.0
|
17-19
|
-
*1 :
700-800 rpm
-
*2 :
No load, N position or P position
IAT Sensor Resistance Inspection
1. Disconnect the MAF/IAT sensor connector.
2. Measure the resistance between MAF/IAT sensor terminals A and F using an ohmmeter.
-
• If not as specified, replace the MAF/IAT sensor.
-
• If the IAT sensor is normal, but the IAT PID is out of specification, perform the "IAT Sensor Circuit Open/Short Inspection".
Specification
|
Ambient temperature (°C {°F})
|
Resistance (kilohms)
|
|
10 {50}
|
3.3-4.1
|
|
20 {68}
|
2.2-2.7
|
|
30 {86}
|
1.4-1.9
|
IAT Sensor Circuit Open/Short Inspection
1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [AJ].)
2. Inspect the following wiring harness for open or short (Continuity check).
Open circuit
-
• If there is no continuity, the circuit is open. Repair or replace the harness.
-
- MAF/IAT sensor terminal A (harness-side) and PCM terminal 91
-
- MAF/IAT sensor terminal F (harness-side) and PCM terminal 39
Short circuit
-
• If there is continuity, the circuit is shorted. Repair or replace the harness.
-
- MAF/IAT sensor terminal A (harness-side) and power supply
-
- MAF/IAT sensor terminal F (harness-side) and power supply
-
- MAF/IAT sensor terminal F (harness-side) and body ground
