N0A770

37805–RN0–A77

2011 Pilot (2WD)

N0A630

37805–RN0–A63

2011 Pilot (4WD)

N0A830

37805–RN0–A83

Year/Model

3. Remove and check the spark plug(s) on the
affected cylinders (example: if P0301 is stored,
check the spark plug on cylinder No. 1).
• If the spark plug(s) are not fouled, this bulletin
does not apply. Continue with normal
troubleshooting.
• If this vehicle has any of the above DTCs, the
spark plug(s) are fouled, and the software is an
earlier version, go to REPAIR PROCEDURE A.
• If this vehicle has any of the above DTCs, the
spark plug(s) are fouled, and the software is a
current or later version, go to step 4.
NOTE: Below are examples of good and fouled
spark plugs.
GOOD

NO GOOD

4. Note which DTCs are stored in the vehicle.
• If the vehicle has one or more of the following
stored DTCs: P0301, P0302, P0303, go to
REPAIR PROCEDURE B to clean the pistons,
replace the piston rings on the cylinders 1–3, and
replace the spark plugs on cylinders 1–4.
• If the vehicle has DTC P0304 with or without any
of the other three DTCs stored, go to REPAIR
PROCEDURE B to clean the pistons, replace the
piston rings on cylinders 1–4, and replace the
spark plugs on cylinders 1–4.

4 of 16

13-082

REPAIR PROCEDURE A
1. Update the PCM software. Refer to Service Bulletin
01-023, Updating Control Units/Modules.

3. Remove the intake duct.
CLIPS

2. Replace spark plugs on cylinders 1–4, then return
the vehicle to the customer.
REPAIR PROCEDURE B
The following service manual procedures have been
used in full or in part within this service bulletin. For
more detail on these procedures, and torque
specifications for some components, refer to the
appropriate electronic service manual.
• Battery Terminal Disconnection and Reconnection
• Fuel Pressure Relieving
• Fuel Line/Quick-Connect Fitting Removal
• Air Cleaner Removal/Installation
• Splash Shield Replacement
• Drive Belt Removal/Installation
• Engine Oil Replacement
• Coolant Replacement
• Hydraulic Power Steering Fluid Check/Replacement
• Intake Manifold Removal and Installation
• Timing Belt Removal and Installation
• Warm Up TWC Removal/Installation
• Cylinder Head Cover Removal
• Cylinder Head Removal and Installation
• Piston Ring Replacement
• PCM Idle Learn Procedure
Engine Repair
• Use fender covers to avoid damaging painted
surfaces.
• To avoid damaging any wires and terminals, unplug
the circuit connectors carefully while holding the
connector portion.
• Mark all the circuits and hoses to avoid
misconnection. Make sure they do not contact other
circuit wiring, hoses, or interfere with other parts.

AIR INTAKE DUCT

4. Do the battery removal procedure.
5. Disconnect the fuel feed hose line at the bulkhead.
QUICK-CONNECT
FITTING COVER

COVER

NUTS (2)

9.8 N.m
(7.2 lb-ft)

1. Relieve the fuel pressure.
2. Remove both front wheels so you can fully lower
the vehicle.

13-082

5 of 16

6. Remove the engine cover.

12. Install a 5/16th inner diameter rubber hose on the
drain bolt located at the rear of the engine block,
loosen the drain bolt, and drain all remaining
coolant. Then disconnect the oil pressure switch
connector.

ENGINE COVER

OIL PRESSURE
SWITCH

7. Remove the radiator cap.
RUBBER
HOSE

8. Raise the vehicle.

DRAIN BOLT

10 N.m (7.4 lb-ft)

9. Remove the front splash shield.
13. Remove the subframe stiffener.

FRONT SPLASH SHIELD

10. Drain the engine oil.

BOLT

11. Loosen the drain plug on the radiator, and drain the
coolant.

10 x 1.25 mm
59 N.m (43 lb-ft)
Replace.

DRAIN
PLUG

6 of 16

13-082

14. Remove exhaust pipe A.

19. Disconnect the MAP sensor connector and the
breather pipe, then remove the intake air duct.

GASKETS

Replace.

INTAKE
AIR DUCT

GASKETS

Replace.
EXHAUST
PIPE A

BREATHER
PIPE

SELF-LOCKING NUTS

54 N.m (40 lb-ft)
Replace.

SELF-LOCKING NUTS

MAP SENSOR
CONNECTOR

33 N.m (25 lb-ft)
Replace.

15. Depending on the diagnosis, remove the
appropriate WU-TWC support bracket bolts.
16. Remove the EGR lower pipe nuts.
17. Remove the crankshaft pulley bolt but not the
pulley.
NOTE: Make sure to apply new oil to the bolt flange
and threads before reinstallation.

20. Disconnect the throttle body connector, the EVAP
canister purge valve connector, the EVAP hose,
the brake booster vacuum hose, and the vacuum
hose.
21. Disconnect and plug the water bypass hoses.
EVAP CANISTER
PURGE VALVE
CONNECTOR

BRAKE BOOSTER
VACUUM HOSE

: Remove any oil
: Clean
: Lubricate with new engine oil
CRANKSHAFT

PULLEY
PULLEY

PULLEY

WASHER

WATER
BYPASS
HOSES

EVAP HOSE
THROTTLE BODY
CONNECTOR

BOLT

22. Remove the drive belt.
18. Lower the vehicle.

13-082

23. Remove the drive belt auto-tensioner.

7 of 16

24. Remove the power steering pump bolts, power
steering hose bracket, then secure the power
steering pump out of the way.
NOTE: Do not remove any of the hoses.
9.8 N.m
(7.2 lb-ft)

POWER STEERING
HOSE BRACKET

31. Remove the intake manifold bolts and nuts in three
steps, then remove the intake manifold.
SPECIFIED TORQUE

22 N.m (16 lb-ft)
3

1

5

POWER
STEERING
PUMP

7

9

8

6

4

2

32. Remove the PCM cover and connectors.
Disconnect the battery cables from the underhood
fuse box.
ECM/PCM
COVER
ECM/PCM

22 N.m (16 lb-ft)

25. Remove the engine harness holder bolt on the side
engine mount.
26. Set the engine to TDC cylinder one.
27. Remove the crankshaft pulley.
28. Remove the timing belt.
29. Remove the timing belt idler pulley.
30. Remove the engine intake upper cover bolts and
nuts, then remove the cover and PCV hose.
BOLTS (3)

9.8 N.m (7.2 lb-ft)

SPECIFIED TORQUE

6 x 1.0 mm
12 N.m (8.7 lb-ft)

2

6

UPPER
COVER

4

8

10

12
11

7

9
3

5

1

PCV HOSE

8 of 16

13-082

33. Remove the appropriate ignition coils based on the
diagnosis.
NOTE: Depending on the diagnosis, you will either
have to remove the rear bank ignition coils or both
ignition coil banks.
FRONT
SPARK PLUGS

22 N.m (16 lb-ft)

6 x 1.0 mm
12 N.m
(8.7 lb-ft)
IGNITION COILS

IGNITION COIL
CONNECTOR

REAR

IGNITION
COILS

SPARK PLUGS

22 N.m (16 lb-ft)

34. Depending on the diagnosis, remove some or all of
the following:
• ECT sensor connector
• Front rocker arm oil pressure switch connector
• Rear rocker arm oil pressure switch connector
• CMP sensor connector
• Front A/F sensor one connector
• Rear A/F sensor one connector
• Front secondary HO2S connector
• Rear secondary HO2S connector
• Rocker arm oil control solenoid A connector
(bank one)
• Rocker arm oil control solenoid A connector
(bank two)
• Rocker arm oil control solenoid B connector
(bank one)
• Alternator connector and positive alternator cable
• A/C clutch switch connector
• EGR 5P valve connector
• Engine ground
• Knock sensor
• Fuel injector connectors and clips
35. Remove the quick-connect fitting cover, then
disconnect the fuel feed hose.
QUICK-CONNECT
FITTING COVER

6 x 1.0 mm
12 N.m
(8.7 lb-ft)
IGNITION COIL
CONNECTOR

FUEL FEED HOSE

13-082