MAF Sensor Check
Precautions: General safety (00)
NOTE:
Even if vehicle is under idling condition, forced regeneration without speed request is activated according to DPF® clogging.
In this state, engine speed at idling is increased.
For details of forced regeneration, refer to “Forced regeneration without Speed Request” under DPF® Regeneration Description:D16AA.
Circuit Diagram
| [A]: | ECM connector (View: [a]) | A3: | MAF sensor ground circuit | 2. | MAF sensor |
| A1: | MAF sensor power supply circuit | B1: | IAT sensor-1 signal circuit | 3. | IAT sensor-1 |
| A2: | MAF sensor signal circuit | 1. | ECM |
Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Parameter check
1)When ignition “OFF”, connect SUZUKI scan tool to DLC.
2)Set ignition “ON”.
3)Check that engine stops and all electrical loads are turned off.
4)Check that “MAF” parameter displayed on SUZUKI scan tool is 0.0 to 1.0 g/sec. (0.0 to 0.13 Lb/min).
Is check result OK?
|
Go to Step 2.
|
Go to Step 5.
|
| 2 |
Parameter check
1)Start engine and warm it up to normal operating temperature.
2)With engine at idle speed, check that “MAF” parameter displayed on SUZUKI scan tool is approx. 5 g/sec. (0.66 Lb/min).
Is check result OK?
|
Go to Step 3.
|
Go to Step 5.
|
| 3 |
Parameter check
1)With all electrical loads turned off, depress accelerator pedal several times and check that “MAF” parameter displayed on SUZUKI scan tool is changed in a short time.
Is check result OK?
|
Go to Step 4.
|
Go to Step 5.
|
| 4 |
Parameter check
1)With engine speed at 3,500 rpm, check that “MAF” parameter displayed on SUZUKI scan tool is 50.0 g/sec. (6.60 Lb/min) or more.
Is check result OK?
|
End.
|
Go to Step 5.
|
| 5 |
MAF sensor power supply circuit and ground circuit check
1)When ignition is “OFF”, disconnect MAF sensor with IAT sensor-1 connector.
2)Check for proper terminal connection to MAF sensor with IAT sensor-1 connector.
3)If connections are OK, set ignition “ON”.
4)Check that voltage between “A1” and “A3” circuits is battery voltage.
Is check result OK?
|
Go to Step 7.
|
Go to Step 6.
|
| 6 |
MAF sensor ground circuit check
1)Check that voltage between “A1” circuit and ground is battery voltage.
Is check result OK?
|
Repair “A3” circuit.
|
Repair “A1” circuit.
|
| 7 |
MAF sensor signal circuit check
1)When ignition is “OFF”, disconnect “E01” connector from ECM.
2)Check for proper terminal connection to “E01” connector.
3)If connections are OK, check the following points.
•Resistance of “A2” circuit: less than 1 Ω
•Resistance between “A2” circuit and ground: infinity •Resistance between “A2” circuit terminal and other terminal at MAF sensor with IAT sensor-1 connector: infinity •Voltage of “A2” circuit: approx. 0 V (When ignition is “ON”) Is check result OK?
|
Go to Step 8.
|
Repair or replace defective wire harness.
|
| 8 |
MAF sensor check
1)Check MAF sensor.
Is check result OK?
|
Replace ECM and recheck parameter.
|
Replace MAF sensor with IAT sensor-1.
|