Engine Controls - Idle Fluctuation/MIL ON/DTC P1129

04-007

February 6, 2004





Applies To

Idle Fluctuation With DTC P1129

SYMPTOM

The idle fluctuates, and the MIL is on with DTC P1129 [high manifold absolute pressure (MAP) sensor signal] set.

PROBABLE CAUSE

The idle air control (IAC) valve is faulty. The IAC valve sticks open and creates a higher manifold pressure than expected, causing DTC P1129 to be set before P0505 (faulty IAC valve) is registered.

CORRECTIVE ACTION

Check for DTC P1129 and P0505. If both are present, or the idle fluctuates, replace the IAC valve.

PARTS INFORMATION

Valve Set: P/N 16022-P8A-A03, H/C 7542046





WARRANTY CLAIM INFORMATION

Failed Part: P/N 16022-P8A-A02
H/C 5612890

Defect Code: 03001

Symptom Code: 03203

Skill Level: Repair Technician

Out of warranty:
Any repair performed after warranty expiration may be eligible for goodwill consideration by the District Parts and Service Manager or your Zone Office. You must request consideration, and get a decision, before starting work.

REPAIR PROCEDURE

1. Connect the HDS to the vehicle's DLC (data link connector), and check for DTCs. If DTC P0505 is stored with P1129, and the customer complains the vehicle idles at a high rpm or the idle fluctuates, replace the IAC valve (page 11-150 of the 2003-04 Pilot Service Manual; page 11-245 of the 1999-2004 Odyssey Service Manual).

2. On the HDS go to the MODE MENU to reset the ECM/PCM.

3. Do the idle learn procedure.

^ Make sure all of the electrical accessories are off, then start the engine and let it run until it reaches normal operating temperature (the cooling fan cycles twice).

^ Let the engine idle for 10 minutes with no load.

4. Check the DATA LIST on the HDS to confirm the MAP sensor is working properly by using the HDS. The MAP sensor reading should be under 1.1 V. If the reading is over 1.1 V, refer to the service manual for normal troubleshooting.





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