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DTC P1129: MAP Sensor Signal Higher Than Expected Honda Pilot I

Testing & Diagnostics 3 illustrations ~515 words
  1. Start the engine. Hold the engine at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
  2. Check the MAP with the scan tool or the HDS. Is 36.9 kPa (277 mmHg, 10.9 in.Hg), 1.1 V, or less indicated? YES -Intermittent failure, system is OK at this time. NO -Replace the MAP sensor.

Scheme 80

Scheme 80: DTC P0112: IAT Sensor Circuit Low Voltage
Scheme 80: DTC P0112: IAT Sensor Circuit Low Voltage
  1. Turn the ignition switch ON (II).
  2. Check the IAT with the scan tool or the HDS. Is 302°F (150°C) or higher (or H-Limit in the HDS), or 0 V indicated? YES -Go to step 3. NO -Go to step 8 .
  3. Disconnect the IAT sensor 2P connector.
  4. Check the IAT with the scan tool or the HDS. Is 302°F (150°C) or higher (or H-Limit in the HDS), or 0 V indicated? YES -Go to step 5. NO -Replace the IAT sensor.
  5. Turn the ignition switch OFF.
  6. Disconnect PCM connector C (31P).
  7. Check for continuity between IAT sensor 2P connector terminal No. 2 and body ground. Is there continuity? YES -Repair short in the wire between the PCM (C25) and the IAT sensor. NO -Substitute a known-good PCM and recheck (see «HOW TO SUBSTITUTE THE PCM FOR TESTING»(ref-173995-S22023424662005041500000) ). If normal voltage is indicated, replace the original PCM.
  8. Check the temperature reading on the scan tool or the HDS. Be aware that if the engine is warm, the reading will be higher than ambient temperature. If the engine is cold, the IAT and ECT will have the same value. Is the correct ambient temperature indicated? YES -Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the IAT sensor and at the PCM. NO -Replace the IAT sensor.

Scheme 81

Scheme 81: DTC P0113: IAT Sensor Circuit High Voltage
Scheme 81: DTC P0113: IAT Sensor Circuit High Voltage

Scheme 82

Scheme 82
Scheme 82
  1. Turn the ignition switch ON (II).
  2. Check the IAT with the scan tool or the HDS. Is -4°F (-20°C) or less (or L-Limit in the HDS), or 5 V indicated? YES -Go to step 3. NO -Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the IAT sensor and at the PCM.
  3. Turn the ignition switch OFF.
  4. Disconnect the IAT sensor 2P connector.
  5. Connect IAT sensor 2P connector terminals No. 1 and No. 2 with a jumper wire.
  6. Turn the ignition switch ON (II).
  7. Check the IAT with the scan tool or the HDS. Is -4°F (-20°C) or less (or L-Limit in the HDS), or 5 V indicated? YES -Go to step 8. NO -Replace the IAT sensor.
  8. Turn the ignition switch OFF.
  9. Remove the jumper wire.
  10. Connect PCM connector terminals C18 and C25 with a jumper wire.
  11. Turn the ignition switch ON (II).
  12. Check the IAT with the scan tool or the HDS. Is -4 °F (-20°C) or less (or L-Limit in the HDS), or 5 V indicated? YES -Substitute a known-good PCM and recheck (see «HOW TO SUBSTITUTE THE PCM FOR TESTING»(ref-173995-S22023424662005041500000) ). If normal voltage is indicated, replace the original PCM. NO -Repair open in the wire between the PCM (C18, C25) and the IAT sensor.

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