DTC Troubleshooting: P0103 (50)

DTC P0103:  MAF Sensor Circuit High 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 ON (II), and wait 2 seconds.

2.Check the MAF SENSOR in the DATA LIST with the HDS.

Is about 202 gm/s, or 4.89 V or more indicated?


YES - Go to 3.


NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the MAF sensor and the ECM/PCM.n


3.Turn the ignition switch OFF.

4.Jump the SCS line with the HDS.

5.Disconnect the MAF sensor/IAT sensor 5P connector.

6.Disconnect ECM/PCM connector B (44P).

7.Check for continuity between MAF sensor/IAT sensor 5P connector terminal No. 4 and ECM/PCM connector terminal B32.

 

Is there continuity?


YES - Go to 8.


NO - Repair open in the wire between the ECM/PCM (B32) and the MAF sensor, then go to 15.

8.Reconnect ECM/PCM connector B (44P).

9.Connect MAF sensor/IAT sensor 5P connector terminals No. 3 and No. 4 with a jumper wire.

 

10.Turn the ignition switch ON (II).

11.Clear the DTC with the HDS.

12.Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0103 indicated?


YES - Go to 20.


NO - Go to 13.


13.Turn the ignition switch OFF.

14.Replace the MAF sensor/IAT sensor.

15.Reconnect all connectors.

16.Turn the ignition switch ON (II).

17.Reset the ECM/PCM with the HDS.

18.Do the ECM/PCM idle learn procedure.

19.Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P0103 is indicated, check for poor connections or loose terminals at the MAF sensor/IAT sensor and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


NO - Troubleshooting is complete.n


20.Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.

21.Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P0103 is indicated, check for poor connections or loose terminals at the MAF sensor/IAT sensor and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.n