DTC detecting condition | Trouble area |
---|---|
DTC will be set when all of the following conditions are detected for 0.5 seconds continuously.
•
Engine is running
(1 driving cycle detection logic)
• Voltage of MAF sensor output is less than the specified value for the specified time continuously. |
•
Open or short in MAF sensor circuit
• MAF sensor • ECM |
Step | Action | YES | NO |
---|---|---|---|
1 |
Was “Engine and Emission Control System Check” performed?
|
Go to Step 2.
|
|
2 |
MAF sensor and its circuit check
1)
Connect scan tool to DLC with ignition switch turned OFF.
2)
Start engine and check MAF value displayed on scan tool. (Refer to
Scan Tool Data:M13A with VVT
for normal value.)
Is normal value indicated?
|
Intermittent trouble. Check for intermittent referring to
Intermittent and Poor Connection Inspection
.
|
Go to Step 3.
|
3 |
MAF sensor power supply voltage check
1)
Disconnect connector from MAF and IAT sensor with ignition switch turned OFF.
2)
Turn ON ignition switch, measure voltage between engine ground and “BLU/BLK” wire terminal of MAF and IAT sensor connector.
Is voltage 10 – 14 V?
|
Go to Step 4.
|
“BLU/BLK” wire in open circuit.
|
4 |
MAF sensor ground circuit check
1)
Turn OFF ignition switch, measure resistance between “YEL/BLK” wire terminal of MAF and IAT sensor connector and engine ground.
Is resistance below 5 Ω?
|
Go to Step 6.
|
Go to Step 5.
|
5 |
Ground circuit check
1)
Measure resistance between “E119-32” terminal of ECM connector and vehicle body ground.
Is resistance below 5 Ω?
|
“YEL/BLK” wire in open or high resistance circuit.
|
ECM grounds “E119-1”, “E117-2” and/or “E117-1” circuit open or high resistance.
If wires are OK, substitute a known-good ECM and recheck.
|
6 |
MAF sensor signal circuit check
1)
Disconnect connectors from ECM with ignition switch turned OFF.
2)
Measure voltage between “YEL/GRN” wire terminal of MAF and IAT sensor connector and engine ground with ignition switch turned ON.
Is voltage 0 V?
|
Go to Step 7.
|
“YEL/GRN” wire shorted to other circuit.
|
7 |
MAF sensor signal circuit check
1)
Measure resistance between “YEL/GRN” wire terminal of MAF and IAT sensor connector and vehicle body ground with ignition switch turned OFF.
Is resistance infinity?
|
Go to Step 8.
|
“YEL/GRN” wire shorted to ground circuit.
|
8 |
MAF sensor signal circuit check
1)
Measure resistance between “YEL/GRN” wire terminal of MAF and IAT sensor connector and “E119-14” terminal of ECM connector.
Is resistance below 3 Ω?
|
Go to Step 9.
|
“YEL/GRN” wire in open or high resistance circuit.
|
9 |
MAF sensor output signal check
1)
Connect connectors to MAF and IAT sensor and ECM with ignition switch turned OFF.
2)
Measure voltage between “E119-14” and “E119-32” terminals of ECM connector referring to
Mass Air Flow (MAF) and Intake Air Temperature (IAT) Sensor On-Vehicle Inspection (With VVT):M13A
.
Is each value within specified?
|
Substitute a known-good ECM and recheck.
|
Faulty MAF and IAT sensor.
|