DTC Troubleshooting: P0102 (50-1)

DTC P0102: MAF Sensor Circuit Low Input Turn the ignition switch ON (II). Check the MAF SENSOR in the DATA LIST with the HDS. Is about 0 gm/s or 0.29 V or less indicated?
YES | - | Go to Step 3 .
NO | - | Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the MAF sensor and the ECM.■
Check No. 18 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 No. 18 ACG (15 A) fuse, replace the fuse, then go to Step 23 .
Turn the ignition switch OFF. Disconnect the MAF/IAT sensor 5P connector. Turn the ignition switch ON (II). Measure voltage between MAF/IAT sensor 5P connector terminal No. 4 and body ground. Is there battery voltage?
YES | - | Go to Step 8 .
NO | - | Repair open in the wire between No. 18 ACG (15 A) fuse and the MAF/IAT sensor, then go to Step 23 .

Measure voltage between MAF/IAT sensor 5P connector terminals No. 2 and No. 3. Is there about 5 V?
YES | - | Go to Step 9 .
NO | - | Go to Step 14 .
Turn the ignition switch OFF, and wait 30 seconds. Disconnect ECM connector No. 1 (96P). |

Check for continuity between MAF/IAT sensor 5P connector terminal No. 1 and body ground. Is there continuity?
YES | - | Repair short in the wire between the MAF/IAT sensor and ECM connector No. 1 terminal No. 90, then go to Step 23 .
NO | - | Go to Step 12 .

Connect MAF/IAT sensor 5P connector terminal No. 1 to body ground with a jumper wire. |

Check for continuity between ECM connector No. 1 terminal No. 90 and body ground. Is there continuity?
YES | - | Go to Step 18 .
NO | - | Repair open in the wire between the MAF/IAT sensor and ECM connector No. 1 terminal No. 90, then go to Step 23 .
Turn the ignition switch OFF, and wait 30 seconds. Disconnect ECM connector No. 1 (96P). |

Connect MAF/IAT sensor 5P connector terminal No. 2 to body ground with a jumper wire. |

Check for continuity between ECM connector No. 1 terminal No. 8 and body ground. Is there continuity?
YES | - | Go to Step 23 .
NO | - | Repair open in the wire between the MAF/IAT sensor and ECM connector No. 1 terminal No. 8, then go to Step 23 .
Reconnect ECM connector No. 1 (96P). |

Connect MAF/IAT sensor 5P connector terminals No. 1 and No. 2 with a jumper wire. Turn the ignition switch ON (II). Check the MAF SENSOR in the DATA LIST with the HDS. Is about 0 gm/s or 0.29 V or less indicated?
YES | - | Go to Step 28 .
NO | - | Go to Step 22 .
Replace the MAF/IAT sensor. Reconnect all connectors. Turn the ignition switch ON (II). Reset the ECM with the HDS. Start the engine. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated?
YES | - | If DTC P0102 is indicated, check for poor connections or loose terminals at the MAF/IAT sensor and the ECM, then go to Step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO | - | Troubleshooting is complete.■
Update the ECM if it does not have the latest software, or substitute a known-good ECM. Start the engine. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated?
YES | - | If DTC P0102 is indicated, check for poor connections or loose terminals at the MAF/IAT sensor and the ECM, then go to Step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO | - | If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. ■