P0102
DTC Troubleshooting: P0102, P0102
DTC P0102:
MAF Sensor Circuit Low Voltage
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.
1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and wait 2 seconds.
2. Check the MAF SENSOR in the DATA LIST with the HDS.
Is about 0 gm/s, or 0.1 V or less indicated?
YES -
Go to step 3.
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 ECM/PCM.�
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the MAF sensor/IAT sensor 5P connector.
5. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
6. Measure the voltage between MAF sensor/IAT sensor 5P connector terminal No. 5 and body ground.
Is there battery voltage?
YES -
Go to step 7.
NO -
Repair open in the wire between PGM-FI main relay 1 and the MAF sensor/IAT sensor, then go to step 19.
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
8. Measure the resistance between MAF sensor/IAT sensor 5P connector terminal No. 3 and body ground.
Is there 190-210 kOhms?
YES -
Go to step 13.
NO -
Go to step 9.
9. Jump the SCS line with the HDS.
10. Disconnect ECM/PCM connector A (49P).
11. Check for continuity between ECM/PCM connector terminal A20 and body ground.
Is there continuity?
YES -
Repair short in the wire between the ECM/PCM(A20) and the MAF sensor/IAT sensor, then go to step 20.
NO -
Go to step 12.
12. Check for continuity between MAF sensor/IAT sensor 5P connector terminal No. 3 and ECM/PCM connector terminal A20.
Is there continuity?
YES -
Go to step 25.
NO -
Repair open in the wire between the ECM/PCM(A20) and the MAF sensor/IAT sensor, then go to step 20.
13. Substitute a known-good MAF sensor/IAT sensor Service and Repair.
14. Reconnect all connectors.
15. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
16. Clear the DTC with the HDS.
17. Start the engine. Hold the engine speed at 2,000 rpm without load (A/T in P or N, M/T in neutral).
18. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0102 indicated?
YES -
Reinstall the original MAF sensor/IAT sensor, then go to step 26.
NO -
Replace the original MAF sensor/IAT sensor Service and Repair, then go to step 19.
19. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
20. Reconnect all connectors.
21. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
22. Reset the ECM/PCM with the HDS.
23. Do the ECM/PCM idle learn procedure ECM/PCM Idle Learn Procedure.
24. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0102 indicated?
YES -
Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the ECM/PCM, then go to step 1.
NO -
Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.�
25. Reconnect all connectors.
26. Update the ECM/PCM if it does not have the latest software ECM/PCM Update, or substitute a known-good ECM/PCM.
27. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0102 indicated?
YES -
Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then recheck. If the ECM/PCM was substituted, go to step 1.
NO -
If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM Service and Repair. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.�