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DTC P1129: MAP Sensor Signal Higher Than Expected Honda CR-V II

Testing & Diagnostics 3 illustrations ~565 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 with no load.
  2. Check the MAP with the scan tool or the HDS. Is 36.9 kPa (277 mmHg, 10.9 in.Hg), or 1.1 V, or less indicated? YES - Intermittent failure, system is OK at this time. NO - Replace the MAP sensor (see «THROTTLE BODY DISASSEMBLY/REASSEMBLY»(ref-171389-S03058078252005020300000) ).

Scheme 93

Scheme 93: DTC P0112: IAT Sensor Circuit Low Voltage
Scheme 93: 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 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 HDS), 0 V indicated? YES - Go to step 5. NO - Replace the IAT sensor (see «IAT Sensor Replacement»(ref-171386-S19177385042005020300000) ).
  5. Turn the ignition switch OFF.
  6. Disconnect ECM/PCM connector B (24P).
  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 ECM/PCM (B17) and the IAT sensor. NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck (see «ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING»(ref-171385-S32387647222005020300000) ). If the symptom/ indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.
  8. Check the temperature reading on the scan tool. 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 about 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 ECM/PCM. NO - Replace the IAT sensor (see «IAT Sensor Replacement»(ref-171386-S19177385042005020300000) ).

Scheme 94

Scheme 94: DTC P0113: IAT Sensor Circuit High Voltage
Scheme 94: DTC P0113: IAT Sensor Circuit High Voltage

Scheme 95

Scheme 95
Scheme 95
  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 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 ECM/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 5 V indicated? YES - Go to step 8. NO - Replace the IAT sensor (see «IAT Sensor Replacement»(ref-171386-S19177385042005020300000) ).
  8. Turn the ignition switch OFF.
  9. Remove the jumper wire.
  10. Connect ECM/PCM connector terminals A10 and B17 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 HDS), or 5 V indicated? YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM then recheck (see «ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING»(ref-171385-S32387647222005020300000) ) if the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM. NO -Repair open in the wire between the ECM/PCM (A10,B17) and the IAT sensor.

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