DTC Troubleshooting: P0102 (50)
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.
  1. Turn the ignition switch to ON (II), and wait 2 seconds.
  1. 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 ECM/PCM.■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the MAF sensor/IAT sensor 5P connector.
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between MAF sensor/IAT sensor 5P connector terminal No. 3 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, then go to Step 19 .
  1. Turn the ignition switch to LOCK (0).
  1. Measure the resistance between MAF sensor/IAT sensor 5P connector terminal No. 1 and body ground.
Is there 190−210 kΩ?
YES -
Go to Step 13 .
NO -
Go to Step 9 .
  1. Jump the SCS line with the HDS.
  1. Disconnect ECM/PCM connector B (49P).
  1. Check for continuity between ECM/PCM connector terminal B31 and body ground.
Is there continuity?
YES -
Repair short in the wire between the ECM/PCM (B31) and the MAF sensor, then go to Step 20 .
NO -
Go to Step 12 .
  1. Check for continuity between MAF sensor/IAT sensor 5P connector terminal No. 1 and ECM/PCM connector terminal B31.
Is there continuity?
YES -
Go to Step 25 .
NO -
Repair open in the wire between the ECM/PCM (B31) and the MAF sensor, then go to Step 20 .
  1. Reconnect all connectors.
  1. Turn the ignition switch to ON (II).
  1. Clear the DTC with the HDS.
  1. Start the engine. Hold the engine speed at 2,000 rpm (min −1 ) without load (A/T in P or N, M/T in neutral).
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0102 indicated?
YES -
Reinstall the original MAF sensor/IAT sensor, then go to Step 26 .
NO -
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect all connectors.
  1. Turn the ignition switch to ON (II).
  1. Reset the ECM/PCM with the HDS.
  1. 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 and the ECM/PCM, then go to Step 1 .
NO -
Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■
  1. Reconnect all connectors.
  1. 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 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. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■