DTC P1128: MAP Sensor Signal Lower Than Expected Honda Crosstour I

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION (+). Before starting this troubleshooting, check for poor connections or a blockage at the intake air duct.

1. Turn the ignition switch to ON (II).
2. Check the MAP SENSOR in the DATA LIST with the HAS. Is less than 54.1 kPa (16.0 inHg, 406 mmHg), or 1.61 V held for more than 5 seconds? YES -Go to step 7 . NO -Go to next step.
3. Clear the DTC with the HAS.
4. Start the engine. Hold the engine speed at 3,000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
5. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) ENGINE SPEED between 1,200 - 5,400 RPM Transmission in D Vehicle speed accelerated from 16 - 31 mph (25 - 50 km/h) under half throttle
6. Monitor the OBD STATUS for DTC P1128 in the DTCs MENU with the HAS. Does the HAS indicate FAILED? YES -Go to next step. NO -If the HAS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and the PCM. If the HAS indicates NOT COMPLETED, go to step 4 and recheck.
7. Turn the ignition switch to LOCK (0).
8. Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(ref-360080-S11024392292010042600000) (+).
9. Turn the ignition switch to ON (II).
10. Reset the PCM with the HAS.
11. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(ref-360079-S22847966492010042600000) (+).
12. Start the engine. Hold the engine speed at 3,000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
13. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) ENGINE SPEED between 1,200 - 5,400 RPM Transmission in D Vehicle speed accelerated from 16 - 31 mph (25 - 50 km/h) under half throttle
14. Check for Pending or Confirmed DTCs with the HAS. Is DTC P1128 indicated? YES -Check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . NO -Go to next step.
15. Monitor the OBD STATUS for DTC P1128 in the DTCs MENU with the HAS. Does the HAS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 14 , go to the indicated DTC's troubleshooting. NO -If the HAS indicates FAILED, check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . If the HAS indicates NOT COMPLETED, go to step 12 .