DTC Troubleshooting
DTC P0102: MAF Sensor Circuit Low VoltageNOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
1. Turn the ignition switch ON (II), 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 and the PCM.
3. Check the No. 3 IG1 ACG (15 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?
YES - Go to step 4.
NO - Repair short in the wire between the MAF sensor and the No. 3 IG1 ACG (15 A) fuse. Also replace the No. 3 IG1 ACG (15 A) fuse, then go to step 20.
4. Turn the ignition switch OFF.
5. Disconnect the MAF sensor/IAT sensor 1 5P connector.
6. Turn the ignition switch ON (II).
7. Measure voltage between MAF sensor/IAT sensor 1 5P connector terminal No. 5 and body ground.
Is there battery voltage?
YES - Go to step 8.
NO - Repair open in the wire between the No. 3 IG1 ACG (15 A) fuse and the MAF sensor, then go to step 20.
8. Turn the ignition switch OFF.
9. Measure resistance between MAF sensor/IAT sensor 1 5P connector terminal No. 3 and body ground.
Is there 190 - 210 kohms?
YES - Go to step 14.
NO - Go to step 10.
10. Jump the SCS line with the HDS.
11. Disconnect PCM connector B (44P).
12. Check for continuity between PCM connector terminal B30 and body ground.
Is there continuity?
YES - Repair short in the wire between the PCM (B30) and the MAF sensor, then go to step 21.
NO - Go to step 13.
13. Check for continuity between MAF sensor/IAT sensor 1 5P connector terminal No. 3 and PCM connector terminal B30.
Is there continuity?
YES - Go to step 26.
NO - Repair open in the wire between the PCM (B30) and the MAF sensor, then go to step 21.
14. Substitute a known-good MAF sensor/IAT sensor 1.
15. Reconnect all connectors.
16. Turn the ignition switch ON (II).
17. Clear the DTC with the HDS.
18. Start the engine. Hold the engine speed at 2,000 rpm without load (in Park or neutral).
19. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0102 indicated?
YES - Go to step 27.
NO - Replace the original MAF sensor/IAT sensor 1, then go to step 20.
20. Turn the ignition switch OFF.
21. Reconnect all connectors.
22. Turn the ignition switch ON (II).
23. Reset the PCM with the HDS.
24. Do the PCM idle learn procedure.
25. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0102 indicated?
YES - Check for poor connections or loose terminals at the MAF sensor/IAT sensor 1 and the PCM, then go to step 1.
NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.
26. Reconnect all connectors.
27. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
28. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0102 indicated?
YES - Check for poor connections or loose terminals at the MAF sensor/IAT sensor 1 and the PCM. If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, go to step 1.
NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.