MDX V6-3471cc 3.5L (2002)
Auxiliary Air Valve (Idle Speed): All Technical Service Bulletins
Engine Controls - Idle Fluctuation/MIL ON/DTC P1129
04-003
February 6, 2004
Applies To:
2001-02 MDX - ALL
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 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
WARRANTY CLAIM INFORMATION
Failed Part:
P/N 16022-P8A-A02
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, or the customer complains
the vehicle idles at a high rpm or the idle fluctuates, replace the IAC valve (see page 11-142 of the 2001-02 MDX 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. 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.
