Honda Accord 2008 Manual page 477

07/11/02 09:05:56 61TA0000_110_0158
PGM-FI System
DTC Troubleshooting (cont'd)
DTC P1129: MAP Sensor Signal Higher 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).
1. Check for vacuum leaks in these parts:
• PCV valve
• PCV hose
• EVAP canister purge valve
• Throttle body
• Intake manifold
• Brake booster
• Brake booster hose
Are there any vacuum leaks?
YES − Repair or replace parts with vacuum leaks,
then go to step 9.
NO − Go to step 2.
2. 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.
3. Check the MAP SENSOR in the DATA LIST with the
HDS.
Is more than 36.9 kPa ( 11.0 in.Hg, 27 7 mmHg), or
1.1 V held f or more than f or 5 seconds?
YES − Go to step 7.
NO − Go to step 4.
4. Clear the DTC with the HDS.
11-158
5. Test-drive under these conditions:
• Engine coolant temperature (ECT SENSOR 1)
above 158 °F (70 °C)
• A/T in D, M/T in 5th
• Drive at a steady speed between 55 75 mph
(88 120 km/h) for 10 seconds −
• During the drive, decelerate (with throttle fully
closed) for at least 2 seconds
6. Monitor the OBD STATUS for DTC P1129 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 5 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
11-343).
12. 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.
ＴＡ０８ＡＥＡＫ７２１０００９１１２９ＦＡＡＴ３０
−