DTC P0102 (2016 2017 2018 2019)
DTC P0102 : MAF Sensor Circuit Low Voltage
NOTE: Before you troubleshoot, review the general troubleshooting information .
| DTC Description | Confirmed DTC | Pending DTC | Freeze Frame |
|---|---|---|---|
| P0102 MAF Sensor Circuit Low Voltage |
DTC (PGM-FI)
- Problem verification
-1. Turn the vehicle to the ON mode, and wait 2 seconds.
-2. Check the parameter (s) below with the HDS.
Signal Threshold Current conditions Values Unit Values Unit MAF SENSOR Less than 0.1 V Do the current condition (s) match the threshold?
YES
The failure is duplicated. Go to step 2.
NO
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot .
- Shorted wire check (IG1 ACG/IG1 (MAIN)/IG1 (AFM) line)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Check the following fuse.
Fuse No. C30 (10 A) Location Under-dash fuse/relay box Is the fuse OK?
YES
The IG1 ACG/IG1 (MAIN)/IG1 (AFM) wire is not shorted. Go to step 3.
NO
Repair a short in the IG1 ACG/IG1 (MAIN)/IG1 (AFM) wire between the MAF sensor/IAT sensor and the No. C30 (10 A) fuse. Also replace the No. C30 (10 A) fuse.
- Open wire check (IG1 ACG/IG1 (MAIN)/IG1 (AFM) line)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Disconnect the following connector.
MAF sensor/IAT sensor 5P connector -3. Turn the vehicle to the ON mode.
-4. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode MAF sensor/IAT sensor 5P connector: disconnected Test point 1 MAF sensor/IAT sensor 5P connector No. 1 Test point 2 Body ground Is there battery voltage?
YES
The IG1 ACG/IG1 (MAIN)/IG1 (AFM) wire is OK. Go to step 4.
NO
Repair an open in the IG1 ACG/IG1 (MAIN)/IG1 (AFM) wire between the No. C30 (10 A) fuse and the MAF sensor/IAT sensor.
- Determine possible failure area (VGP line, others)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Measure the resistance between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode MAF sensor/IAT sensor 5P connector: disconnected Test point 1 MAF sensor/IAT sensor 5P connector No. 3 Test point 2 Body ground Is there 190-210 kΩ?
YES
Go to step 7.
NO
Go to step 5.
- Shorted wire check (VGP line)
-1. Jump the SCS line with the HDS
-2. Disconnect the following connector.
PCM connector B (51P) -3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode MAF sensor/IAT sensor 5P connector: disconnected PCM connector B (51P): disconnected Test point 1 PCM connector B (51P) No. 23 Test point 2 Body ground Is there continuity?
YES
Repair a short in the VGP wire between the PCM (B23) and the MAF sensor/IAT sensor.
NO
The VGP wire is not shorted. Go to step 6.
- Open wire check (VGP line)
-1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode MAF sensor/IAT sensor 5P connector: disconnected PCM connector B (51P): disconnected Test point 1 PCM connector B (51P) No. 23 Test point 2 MAF sensor/IAT sensor 5P connector No. 3 Is there continuity?
YES
The VGP wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If DTC P0102 goes away and the PCM was updated, troubleshooting is complete. If DTC P0102 goes away and the PCM was substituted, replace the original PCM .
NO
Repair an open in the VGP wire between the PCM (B23) and the MAF sensor/IAT sensor.
- MAF sensor/IAT sensor check (substitution)
-1. Substitute a known-good MAF sensor/IAT sensor.
-2. Reconnect all connectors.
-3. Turn the vehicle to the ON mode.
-4. Clear the DTC with the HDS.
-5. Start the engine. Hold the engine speed at 2, 000 rpm without load (CVT in P or N, M/T in neutral).
-6. Check for Pending or Confirmed DTCs with the HDS.
DTC Description Confirmed DTC Pending DTC Freeze Frame P0102 MAF Sensor Circuit Low Voltage Is DTC P0102 indicated?
YES
The MAF sensor/IAT sensor is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If DTC P0102 goes away and the PCM was updated, troubleshooting is complete. If DTC P0102 goes away and the PCM was substituted, replace the original PCM .
NO