Honda Accord 2008 Manual page 476

07/11/02 09:05:56 61TA0000_110_0157
DTC P1128: MAP Sensor Signal Lower Than
Expected
NOTE:
• Before you troubleshoot, record all freeze data and
any on-board snapshot, and review the general
troubleshooting information (see page 11-3).
• Before starting this troubleshooting check for poor
connections or 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
HDS.
Is less than 54.1 kPa ( 16.0 in.Hg, 406 mmHg), or
1.61 V held f or more than 5 seconds?
YES − Go to step 7.
−
NO Go to step 3.
3. Clear the DTC with the HDS.
4. Start the engine. Hold the engine speed at
3,000 rpm without load (A/T in P or N, M/T in
neutral) 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 1,400 5,400 rpm
• A/T in D, M/T in 3rd
• 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 HDS.
Does the screen indicate F AILED?
−
YES Go to step 7.
−
NO If the screen indicates PASSED, intermittent
failure, the system is OK at this time. Check for
poor connections or loose terminals at the MAP
sensor and the ECM/PCM. If the screen indicates
NOT COMPLETED, go to step 4 and recheck.
7. Turn the ignition switch to LOCK (0).
8. Replace the MAP sensor (see page 11-227).
9. Turn the ignition switch to ON (II).
10. Reset the ECM/PCM with the HDS.
11. Do the ECM/PCM idle learn procedure (see page
12. Start the engine. Hold the engine speed at
13. Test-drive under these conditions:
14. Check for Temporary DTCs or DTCs with the HDS.
15. Monitor the OBD STATUS for DTC P1128 in the
−
−
ＴＡ０８ＡＥＡＫ７２１０００９１１２８ＦＡＡＴ３０
11-343).
3,000 rpm without load (A/T in P or N, M/T in
neutral) until the radiator fan comes on, then let it
idle.
• Engine coolant temperature (ECT SENSOR 1)
above 158 °F (70 °C)
• Engine speed between 1,400 5,400 rpm −
• A/T in D, M/T in 3rd
• Vehicle speed accelerated from 16 31 mph
(25 50 km/h) under half throttle −
Is DT C P1128 indicated?
YES − Check for poor connections or loose
terminals at the MAP sensor and the ECM/PCM,
then go to step 1.
NO − Go to step 15.
DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES − Troubleshooting is complete. If any other
Temporary DTCs or DTCs were indicated in step 14,
go to the indicated DTC's troubleshooting.
NO − If the screen indicates FAILED, check for poor
connections or loose terminals at the MAP sensor
and the ECM/PCM, then go to step 1. If the screen
indicates NOT COMPLETED, go to step 12.
−
11-157