Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
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Scheme 343
- Turn the ignition switch to ON (II), and wait 2 seconds.
- 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 PCM.
- Turn the ignition switch to LOCK (0).
- Disconnect the MAF sensor/IAT sensor 5P connector.
- Turn the ignition switch to ON (II).
- 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 an open in the wire between the No. 12 IMA (10 A) fuse in the under-dash fuse/relay box and the MAF sensor/IAT sensor, then go to step 19 .
- Turn the ignition switch to LOCK (0).
- 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.
- Jump the SCS line with the HDS.
- Disconnect PCM connector B (49P).
- Check for continuity between PCM connector terminal B12 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (B12) and the MAF sensor/IAT sensor, then go to step 20 . NO -Go to step 12.
- Check for continuity between PCM connector terminal B12 and MAF sensor/IAT sensor 5P connector terminal No. 3. Is there continuity? YES -Go to step 25 . NO -Repair an open in the wire between the PCM (B12) and the MAF sensor/IAT sensor, then go to step 20 .
- Substitute a known-good MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(ref-513153-S30292750782012110700000) ).
- Reconnect all connectors.
- Turn the ignition switch to ON (II).
- Clear the DTC with the HDS.
- Start the engine. Hold the engine speed at 2, 000 rpm without load (in P or N).
- Check for Pending or Confirmed DTCs with the HDS. Is DTC P0102 indicated? YES -Reinstall the original MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(ref-513153-S30292750782012110700000) ), then go to step 26 . NO -Replace the original MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(ref-513153-S30292750782012110700000) ), then go to step 19.
- Turn the ignition switch to LOCK (0).
- Reconnect all connectors.
- Turn the ignition switch to ON (II).
- Reset the PCM with the HDS.
- Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(ref-513173-S16164063582012110700000) ).
- 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 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»(ref-513153-S06499438282012110700000) .
- Reconnect all connectors.
- Update the PCM if it does not have the latest software (see «PCM UPDATE»(ref-513153-S08553155092012110700000) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(ref-513169-S18138486322012110700000) ).
- 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 PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(ref-513169-S18138486322012110700000) ), 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 (see «PCM REPLACEMENT»(ref-513153-S08243124262012110700000) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(ref-513153-S06499438282012110700000) .