SB-12-036

SB-10048879-7034
Service Bulletin
Applies To:
12-036
2007–09 RDX – ALL
November 21, 2012
2010 RDX 2WD – From VIN 5J8TB2H..AA000001 thru 5J8TB2H..AA004530
2010 RDX SH-AWD – From VIN 5J8TB1H..AA000001 thru 5J8TB1H..AA007495
MIL Comes On With DTC P0420
The MIL is on, and DTC P0420 (TWC catalyst system
efficiency below threshold) is stored.
SH-AWD Only
Fill Washer, 24 mm:
P/N: 90441-PK4-000
PROBABLE CAUSE
Drain Washer, 18 mm:
P/N: 90471-PX4-000
SYMPTOM
The flapper valve in the fuel tank unit may rub on the
fuel filter. Under low fuel levels this may cause a lean
fuel condition, which may result in damage to the warm
up three way catalyst (WU-TWC).
REQUIRED MATERIALS
ATF-DW1 (SH-AWD Only):
(4 quarts)
P/N: 08200-9008A
CORRECTIVE ACTION
Replace the fuel tank unit (fuel pump module
assembly) and the WU-TWC.
TOOL INFORMATION
Fuel Sender Wrench: T/N 07AAA-S0XA100
PARTS INFORMATION
Fuel Pump Module Assembly (includes fuel tank unit,
base gasket, locknut, and locknut plate):
P/N: 17045-STK-A01
WARRANTY CLAIM INFORMATION
The normal warranty applies.
Warm Up Three Way Catalyst:
P/N: 18190-RWC-A00
Turbo to Warm Up Three Way Catalyst Gasket:
P/N: 18234-RWC-A01
Turbo to Warm Up Three Way Catalyst Bolt:
(2 required)
P/N: 90011-RWC-A01
Turbo to Warm Up Three Way Catalyst Nut:
P/N: 90212-RSR-E01
Under-Floor Catalyst Front Gasket:
P/N: 18229-SLJ-033
OP#
Description
FRT
3101D2
Replace fuel tank unit
0.6
3111HO
2WD Models:
replace WU-TWC
1.3
3111H0
SH-AWD Models:
replace WU-TWC
1.8
Failed Part:
P/N 18190-RWC-A00
Defect Code:
07403
Symptom Code:
03214
Skill Level:
Repair Technician
Under-Floor Catalyst Rear Gasket:
P/N: 18393-SS0-J30
Exhaust Pipe to Under-Floor Catalyst Nut:
(3 required)
P/N: 90212-SA5-003
 2012 American Honda Motor Co., Inc. – All Rights Reserved
BTB 48385 (1211)
1 of 8
CLIENT INFORMATION: The information in this bulletin is intended for use only by skilled technicians who have the proper tools, equipment, and
training to correctly and safely maintain your vehicle. These procedures should not be attempted by “do-it-yourselfers,” and you should not assume this
bulletin applies to your vehicle, or that your vehicle has the condition described. To determine whether this information applies, contact an authorized
Acura automobile dealer.
REPAIR PROCEDURE
1. Relieve the fuel pressure as described in the
appropriate service manual. Online, enter keywords
FUEL PRESSURE, and select Fuel Pressure
Relieving.
2. Remove the fuel cap.
9. Remove the locknut and the locknut plate, and lift up
the fuel tank unit from the fuel tank. Disconnect the
transfer tube.
LOCKNUT
Replace.
LOCKNUT PLATE
3. Fold the rear seat down, then remove the left rear
door sill trim.
Replace.
FUEL TANK UNIT
4. Pull back the carpet to expose the fuel tank access
panels.
Replace.
5. Remove the access panel from the left side of the
floor.
BASE GASKET
Replace.
6. Disconnect the fuel tank unit 4P connector.
7. Disconnect the quick-connect fittings from the fuel
tank unit.
ACCESS
PANEL
TRANSFER TUBE
FUEL TANK UNIT
4P CONNECTOR
10. Temporarily position the new base gasket on the
new fuel tank unit.
QUICKCONNECT
FITTINGS
11. Make sure the mark on the transfer tube is facing
up.
8. Loosen the locknut with a fuel sender wrench.
FUEL SENDER WRENCH
07AAA-S0XA100
LOCKNUT
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12-036
12. Connect the transfer tube, then insert the new fuel
tank unit partially into the fuel tank.
NOTE:
• Be careful not to damage the new base gasket.
• Be careful not to bend the fuel gauge sending
unit.
14. Align the marks on the fuel tank and the fuel tank
unit, then insert the fuel tank unit until it sits on the
base gasket.
NOTE: To prevent a fuel leak, check the base
gasket, visually or by hand, to make sure it is not
pinched.
• Do not coat the base gasket with oil.
NO GOOD
FUEL TANK UNIT
FUEL TANK UNIT
ALIGNMENT MARK
BASE GASKET
GOOD
FUEL TANK
UNIT MARKS
TRANSFER TUBE
TRANSFER
TUBE MARK
BASE GASKET
15. Using the fuel sender wrench, install a new locknut
with a new locknut plate and torque it to 70 N.m
(51.6 lb-ft).
13. Transfer the base gasket from the fuel tank unit to
the fuel tank.
LOCKNUT
LOCKNUT PLATE
FUEL SENDER WRENCH
07AAA-S0XA100
NOTE:
• After torquing, make sure the marks are still
aligned.
• After installation, check the base gasket visually
or by hand again to make sure its not pinched.
16. Connect the fuel tank unit 4P connector.
17. Reconnect the negative cable to the battery and
turn the ignition switch to ON (II) (do not operate
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3 of 8
the starter motor) two or three times to raise the
fuel pressure.
23. Remove the turbocharger cover.
BOLTS
12 N.m (8.7 lb-ft)
18. Check for leaks in the fuel supply system.
19. Reinstall the remaining parts in the reverse order of
removal.
TURBOCHARGER
COVER
20. Remove the charge air cooler cover.
CHARGE AIR
COOLER COVER
CHARGE AIR
COOLER COVER
FRONT BRACKET
24. Remove the A/F sensor.
21. Remove the charge air cooler cover bracket.
BOLTS (3)
9.8 N.m
(7.2 lb-ft)
CHARGE AIR
COOLER COVER
BRACKET
A/F SENSOR
44 N.m (33 lb-ft)
POWER STEERING
FEED HOSE BRACKET
4P CONNECTOR
25. Raise the vehicle on a lift.
26. Remove the splash shield.
HOSE
22. Remove the power steering feed hose bracket,
then remove the hose in the direction of the
arrow.
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12-036
27. Remove the 4P connector from the water hose
lower cover, then remove the cover.
29. Remove the WU-TWC bracket.
NOTE: SH-AWD model is shown.
BOLT
44 N.m
(33 lb-ft)
BOLTS
12 N.m
(8.7 lb-ft)
4P CONNECTOR
WU-TWC
BRACKET
BOLT
44 N.m
(33 lb-ft)
30. Disconnect the secondary HO2S 4P connector,
then remove the secondary HO2S.
WATER HOSE
LOWER COVER
4P CONNECTOR
28. Remove the under-floor TWC.
NOTE: SH-AWD model is shown.
NUTS
Replace.
33 N.m
(25 lb-ft)
GASKET
GASKET
Replace.
SECONDARY HO2S
44 N.m (33 lb-ft)
Replace.
UNDER-FLOOR
TWC
BOLTS
22 N.m
(16 lb-ft)
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5 of 8
31. SH-AWD Models Only: Remove the transfer
assembly.
• Make a reference mark across the propeller shaft
and the transfer companion flange.
• Shift the transmission into N.
PROPELLER
SHAFT
• Remove the drain plug, and drain the automatic
transmission fluid (ATF).
DRAIN PLUG
18 x 1.5 mm
49 N.m (36 lb-ft)
SEALING WASHER
Replace.
REFERENCE
MARK
TRANSFER
COMPANION
FLANGE
• Reinstall the drain plug with a new sealing washer.
• Remove the bolt securing the transfer breather hose
bracket, and disconnect the breather hose from the
breather pipe on the transfer assembly. Cap the
breather pipe to prevent fluid from leaking out.
• Separate the propeller shaft from the transfer
companion flange.
• Remove the transfer assembly from the
transmission.
BREATHER HOSE
BREATHER
PIPE
BREATHER
HOSE
BRACKET
TRANSFER
ASSEMBLY
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12-036
32. Remove the P/S heat shield.
35. From under the vehicle,slide the WU-TWC
toward the passenger’s side to free the
WU-TWC from the stud on the turbocharger.
STUD
WU-TWC
P/S HEAT
SHIELD
BOLTS
6 x 1.0 mm
33. Remove the water hose upper cover.
34. Remove the mounting bolts and nut from the
WU-TWC.
WATER HOSE
UPPER COVER
MOUNTING BOLT
44 N.m (33 lb-ft)
NUT
BOLTS
12 N.m
(8.7 lb-ft)
44 N.m
(33 lb-ft)
36. Rotate the turbocharger side of the WU-TWC down
to the steering gearbox housing, then slide the
WU-TWC toward the driver’s side along the
gearbox housing until the WU-TWC clears the
turbocharger.
TURBOCHARGER
WU-TWC
GEARBOX
HOUSING
MOUNTING
BOLT
44 N.m
(33 lb-ft)
This view is from the rear of
the engine compartment.
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37. Lower and rotate the under-floor TWC side of the
WU-TWC toward the passenger’s side, then
remove the WU-TWC from the subframe.
WU-TWC
38. Remove the WU-TWC cover.
BOLTS
CONVERTER
COVER
9.8 N.m
(7.2 lb-ft)
CONVERTER
COVER
39. Install the converter cover onto the new WU-TWC,
then insert the WU-TWC into vehicle.
40. Install the parts in the reverse order of removal.
• Replace the WU-TWC gaskets.
• Replace the bolts and the nut that attach the
WU-TWC to the turbocharger.
• Replace the under-floor TWC gaskets and nuts.
41. SH-AWD Models: Refill the ATF – 2.9L (3.1 qt).
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12-036

SB-10048879-9949
Service Bulletin
Applies To:
12-036
2007–09 RDX – ALL
2010 RDX 2WD – From VIN 5J8TB2H..AA000001 thru 5J8TB2H..AA004530
2010 RDX SH-AWD – From VIN 5J8TB1H..AA000001 thru 5J8TB1H..AA007495
January 8, 2014
MIL Comes On With DTC P0420
(Supersedes 12-036, dated November 21, 2012, to revise the information marked by the black bars)
REVISION SUMMARY
• Under CORRECTIVE ACTION and REPAIR
PROCEDURE, information was changed to use the
original fuel tank unit and replace the fuel tank
reservoir only.
• Under WARRANTY CLAIM INFORMATION, a
description and a flat rate time were changed.
SYMPTOM
The MIL is on, and DTC P0420 (TWC catalyst system
efficiency below threshold) is stored.
POSSIBLE CAUSE
The flapper valve in the fuel tank unit may rub on the
fuel filter. Under low fuel levels this may cause a lean
fuel condition, which may result in damage to the warm
up three way catalyst (WU-TWC).
CORRECTIVE ACTION
Replace the fuel tank unit reservoir (reuse the original
fuel pump) and the WU-TWC.
PARTS INFORMATION
Fuel Tank Unit Reservoir:
P/N: 16011-STK-A00
Fuel Tank Unit Locknut and Gasket:
P/N: 17046-STK-A00
Warm Up Three Way Catalyst:
P/N: 18190-RWC-A00
Turbo to Warm Up Three Way Catalyst Gasket:
P/N: 18234-RWC-A01
Turbo to Warm Up Three Way Catalyst Bolt:
(2 required)
P/N: 90011-RWC-A01
Under-Floor Catalyst Rear Gasket:
P/N: 18393-SS0-J30
Exhaust Pipe to Under-Floor Catalyst Nut
(3 required):
P/N: 90212-SA5-003
SH-AWD Only
Fill Washer, 24 mm:
P/N: 90441-PK4-000
Drain Washer, 18 mm:
P/N: 90471-PX4-000
REQUIRED MATERIALS
ATF-DW1 (SH-AWD Only):
(4 quarts)
P/N: 08200-9008A
TOOL INFORMATION
Fuel Sender Wrench: T/N 07AAA-S0XA100
WARRANTY CLAIM INFORMATION
The normal warranty applies.
OP#
Description
FRT
3101D2
Replace fuel tank unit reservoir.
3111H0
2WD Models: Replace WU-TWC
1.3 hr
3111H0
SH-AWD Models: Replace WU-TWC
1.8 hr
Failed Part:
P/N 18190-RWC-A00
Defect Code:
07403
Symptom Code:
03214
Skill Level:
Repair Technician
1.1 hr
Turbo to Warm Up Three Way Catalyst Nut:
P/N: 90212-RSR-E01
Under-Floor Catalyst Front Gasket:
P/N: 18229-SLJ-033
 2013 American Honda Motor Co., Inc. – All Rights Reserved
BTB 48385-50817 REV1 (1401)
1 of 9
CLIENT INFORMATION: The information in this bulletin is intended for use only by skilled technicians who have the proper tools, equipment, and
training to correctly and safely maintain your vehicle. These procedures should not be attempted by “do-it-yourselfers,” and you should not assume this
bulletin applies to your vehicle, or that your vehicle has the condition described. To determine whether this information applies, contact an authorized
Acura automobile dealer.
REPAIR PROCEDURE
1. Relieve the fuel pressure as described in the
appropriate service manual. Online, enter
keywords FUEL PRESSURE, and select Fuel
Pressure Relieving.
8.
Loosen the locknut with a fuel sender wrench.
FUEL SENDER WRENCH
07AAA-S0XA100
2. Remove the fuel cap.
3. Fold the rear seat down, then remove the left rear
door sill trim.
4. Pull back the carpet to expose the fuel tank access
panels.
5. Remove the access panel from the left side of the
floor.
6. Disconnect the fuel tank unit 4P connector.
7. Disconnect the quick-connect fittings from the fuel
tank unit.
ACCESS
PANEL
LOCKNUT
9. Remove the locknut and the locknut plate, and lift
up the fuel tank unit from the fuel tank. Disconnect
the transfer tube.
LOCKNUT
Replace.
FUEL TANK UNIT
4P CONNECTOR
LOCKNUT PLATE
Replace.
FUEL TANK UNIT
Replace.
BASE GASKET
QUICKCONNECT
FITTINGS
Replace.
TRANSFER TUBE
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12-036
10. Slide the fuel gauge sending unit wires out from the
clip on top of the fuel tank unit.
NOTE: Be careful not to stretch any of the fuel
gauge sending unit wires.
11. Detach the fuel gauge sending unit from the fuel
tank unit.
• Using a pocket screwdriver, press down on the
tab that holds the sending unit to the fuel tank
unit.
• Slide the sending unit down.
FUEL PUMP
Retain.
Slide the
fuel gauge
sending wires
from the clip.
Detach the fuel
gauge sending
unit.
TABS
PLASTIC
CARD
POCKET
SCREWDRIVER
TAB
FUEL TANK
UNIT RESERVOIR
FUEL GAUGE
SENDING UNIT
Replace.
13. Install the new reservoir onto the fuel tank unit in
reverse order.
14. Temporarily position the new base gasket on the
fuel tank unit.
Depress the
hidden tab
to release the
sending unit.
15. Make sure the mark on the transfer tube is facing
up.
12. Remove the original fuel tank unit reservoir from
the fuel tank unit.
• Insert a credit-card-sized plastic card between
one of the three tabs holding the reservoir.
• Unsnap the remaining two tabs and slide the
original reservoir down from the fuel pump.
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3 of 9
16. Connect the transfer tube, then insert fuel tank unit
partially into the fuel tank.
NOTE:
• Be careful not to bend the fuel gauge sending
unit.
• Be careful not to damage the new base gasket.
• Do not coat the base gasket with oil.
18. Align the marks on the fuel tank and the fuel tank
unit, then insert the fuel tank unit until it sits on the
base gasket.
NOTE: To prevent a fuel leak, check the base
gasket, visually or by hand, to make sure it is not
pinched.
NO GOOD
FUEL TANK UNIT
ALIGNMENT MARK
FUEL TANK UNIT
BASE GASKET
GOOD
FUEL TANK
UNIT MARKS
TRANSFER TUBE
BASE GASKET
TRANSFER
TUBE MARK
17. Transfer the base gasket from the fuel tank unit to
the fuel tank.
19. Using the fuel sender wrench, install a new locknut
with a new locknut plate and torque it to 70 N•m
(51.6 lb-ft).
NOTE:
• After torquing, make sure the marks are still
aligned.
• After installation, check the base gasket visually
or by hand again to make sure its not pinched.
LOCKNUT
LOCKNUT PLATE
FUEL SENDER WRENCH
07AAA-S0XA100
20. Connect the fuel tank unit 4P connector.
21. Reconnect the negative cable to the battery and
turn the ignition switch to ON (II) (do not operate
the starter motor) two or three times to raise the
fuel pressure.
22. Check for leaks in the fuel supply system.
4 of 9
12-036
23. Reinstall the remaining parts in the reverse order of
removal.
27. Remove the turbocharger cover.
BOLTS
12 N.m (8.7 lb-ft)
24. Remove the charge air cooler cover.
CHARGE AIR
COOLER COVER
TURBOCHARGER
COVER
CHARGE AIR
COOLER COVER
FRONT BRACKET
28. Remove the A/F sensor.
25. Remove the charge air cooler cover bracket.
BOLTS (3)
9.8 N.m
(7.2 lb-ft)
CHARGE AIR
COOLER COVER
BRACKET
POWER STEERING
FEED HOSE BRACKET
A/F SENSOR
44 N.m (33 lb-ft)
4P CONNECTOR
29. Raise the vehicle on a lift.
30. Remove the splash shield.
HOSE
26. Remove the power steering feed hose bracket,
then move the hose in the direction of the arrow.
12-036
5 of 9
31. Remove the 4P connector from the water hose
lower cover, then remove the cover.
NOTE: SH-AWD model is shown; 2WD is similar.
BOLT
44 N.m
(33 lb-ft)
BOLTS
12 N.m
(8.7 lb-ft)
WU-TWC
BRACKET
4P CONNECTOR
BOLT
44 N.m
(33 lb-ft)
34. Disconnect the secondary HO2S 4P connector,
then remove the secondary HO2S.
4P CONNECTOR
WATER HOSE
LOWER COVER
32. Remove the under-floor TWC.
NOTE: SH-AWD model is shown; 2WD is similar.
NUTS
Replace.
33 N.m
(25 lb-ft)
SECONDARY HO2S
GASKET
44 N.m (33 lb-ft)
Replace.
GASKET
Replace.
UNDER-FLOOR
TWC
BOLTS
22 N.m
(16 lb-ft)
33. Remove the WU-TWC bracket.
6 of 9
12-036
35. SH-AWD Models Only: Remove the transfer
assembly.
• Shift the transmission into N.
• Remove the drain plug, and drain the automatic
transmission fluid (ATF).
DRAIN PLUG
18 x 1.5 mm
49 N.m (36 lb-ft)
• Make a reference mark across the propeller shaft
and the transfer companion flange.
PROPELLER
SHAFT
SEALING WASHER
Replace.
REFERENCE
MARK
TRANSFER
COMPANION
FLANGE
• Reinstall the drain plug with a new sealing
washer.
• Remove the bolt securing the transfer breather
hose bracket, and disconnect the breather hose
from the breather pipe on the transfer assembly.
Cap the breather pipe to prevent fluid from
leaking out.
• Separate the propeller shaft from the transfer
companion flange.
• Remove the transfer assembly from the
transmission.
BREATHER HOSE
BREATHER
PIPE
BREATHER
HOSE
BRACKET
12-036
TRANSFER
ASSEMBLY
7 of 9
36. Remove the P/S heat shield.
39. From under the vehicle, slide the WU-TWC toward
the passenger’s side to free the
WU-TWC from the stud on the turbocharger.
STUD
WU-TWC
P/S HEAT
SHIELD
BOLTS
6 x 1.0 mm
37. Remove the water hose upper cover.
38. Remove the mounting bolts and nut from the
WU-TWC.
WATER HOSE
UPPER COVER
MOUNTING BOLT
44 N.m (33 lb-ft)
NUT
BOLTS
12 N.m
(8.7 lb-ft)
44 N.m
(33 lb-ft)
40. Rotate the turbocharger side of the WU-TWC down
to the steering gearbox housing, then slide the
WU-TWC toward the driver’s side along the
gearbox housing until the WU-TWC clears the
turbocharger.
TURBOCHARGER
WU-TWC
GEARBOX
HOUSING
MOUNTING
BOLT
44 N.m
(33 lb-ft)
This view is from the rear of
the engine compartment.
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12-036
41. Lower and rotate the under-floor TWC side of the
WU-TWC toward the passenger’s side, then
remove the WU-TWC from the subframe.
WU-TWC
42. Remove the WU-TWC cover.
BOLTS
CONVERTER
COVER
9.8 N.m
(7.2 lb-ft)
CONVERTER
COVER
43. Install the converter cover onto the new WU-TWC,
then insert the WU-TWC into vehicle.
44. Install the parts in the reverse order of removal.
• Replace the WU-TWC gaskets.
• Replace the bolts and the nut that attach the
WU-TWC to the turbocharger.
• Replace the under-floor TWC gaskets and nuts.
45. SH-AWD Models: Refill the ATF – 2.9L (3.1 qt).
12-036
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