5.
IS THE MAFS SIGNAL CHANGED PROPERLY ACCORDING TO THE SIMULATION OF VOLTAGE ?
YES
a.
Go to step 8
NO
a.
Recheck open or short in the wire between the MAFS terminal 1 and the ECM terminal 8/C230-2.
b.
Go to step 6
Connect the scan tool to the data link connector(DLC) and start the engine.
Go to SIMU-SCAN
Fix the mass air folw quantity current data for the voltage simulation.
- For SIMU-SCAN function information, Go to "Component Inspection" procedure
Apply the simulation voltage to the MAFS terminal 1.
IS THE MAFS SIGNAL CHANGED PROPERLY ACCORDING TO THE SIMULATION OF VOLTAGE ?
YES
Go to step 8
NO
Recheck open or short in the wire between the MAFS terminal 1 and the ECM terminal 8/C230-2.
Go to step 6
Apply the simulation voltage to the ECM terminal 8/C230-2 directly.
IS THE MAFS SIGNAL CHANGED PROPERLY ACCORDING TO THE SIMULATION OF VOLTAGE ?
YES
Recheck open or short in the wire between the MAFS terminal 1 and the ECM terminal 8/C230-2.
Go to step 8
NO
Replace a known - good ECM and recheck. if normal MAFS readings are indicated, replace the ECM
HFM5/4.7 WITH TEMPERAURE SENSOR
Mass air Flow m(kg/h) | Output Voltage UA(V) | Tolerance △m/m[ % ] | Tolerance(Min) UA[V] | Tolerance(Max) UA[V] |
8 | 1.2571 | ± 3 | 1.2483 | 1.2657 |
10 | 1.3289 | ± 3 | 1.3184 | 1.3393 |
15 | 1.4876 | ± 3 | 1.4746 | 1.5004 |
30 | 1.838 | ± 3 | 1.8198 | 1.856 |
60 | 2.3252 | ± 3 | 2.3022 | 2.3477 |
120 | 2.9072 | ± 3 | 2.879 | 2.9347 |
250 | 3.6237 | ± 3 | 3.5923 | 3.6543 |
370 | 4.0448 | ± 3 | 4.0108 | 4.0779 |
480 | 4.3441 | ± 3 | 4.3085 | 4.3789 |
There is a signal voltage or a output value difference due to the contact resistnace or any other reasons between the probe and the sensor terminal.
Perform the test drive
MONITORING FOR PENDING DTC SET ?
YES
Go to the applicable troubleshooting procedure.
NO
System OK
