S-SB-0008-16

S-SB-0008-16
October 20, 2016
Rough Idle
Service
Category
Engine/Hybrid System
Section
Engine Mechanical
Market USA
Applicability
YEAR(S)
MODEL(S)
2012 - 2013
iQ
ADDITIONAL INFORMATION
Introduction
Some 2012 – 2013 model year iQ vehicles may exhibit one or more of the following conditions:

Rough idle condition.

Idle speed momentarily drops at idle.

MIL “ON” with one or more of the following DTCs: P1603, P1604 and/or P1605. These
may be caused by excessive carbon build-up on piston head.
Follow the Repair Procedure in this Service Bulletin to address this condition.
Production Change Information
This bulletin applies to vehicles produced BEFORE the Production Change Effective VIN
shown below.
MODEL
PLANT
DRIVETRAIN
PRODUCTION CHANGE EFFECTIVE VIN
iQ
Takaoka
CVT
JTNJJXB0#DJ024169
Warranty Information
OP CODE
DESCRIPTION
TIME
OFP
T1
T2
EG1628
R & R Engine Valve Cover & De-Carbon Engine
Combustion Chamber
5.1
11201-47121
02
43
APPLICABLE WARRANTY
This repair is covered under the Toyota Powertrain Warranty. This warranty is in effect for
60 months or 60,000 miles, whichever occurs first, from the vehicle’s in-service date.
Warranty application is limited to occurrence of the specified condition described in
this bulletin.
© 2016 Toyota Motor Sales, USA
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Rough Idle
Parts Information
PART NUMBER
PART NAME
QTY
Cover Sub-Assy, Cylinder
1
002790WQTE01
0W20 ILSAC Multigrade Engine Oil
8
04152YZZA7
Oil Filter Element Kit
2
90430-12031
Gasket (For oil pan drain plug)
1
90919-01275
Spark Plug
4
00289-1TE00
Top Engine Cleaner
1
90068-14030
O Ring, Camshaft Timing Oil Control Valve
2
PREVIOUS
NEW
11201-47120
11201-47121
Required Tools & Equipment
REQUIRED TOOLS & MATERIAL
QUANTITY
Torque Wrench
1
Chemical Resistant Measuring Container – 30 ml
1
REQUIRED EQUIPMENT
SUPPLIER
Techstream 2.0*
Techstream Lite
QTY
TS2UNIT
ADE
Techstream Lite (Green Cable)
Video Borescope
PART NUMBER
TSLITEPDLR01
1
TSLP2DLR01
JS Steelman
JSP97291
* Essential SST.
NOTE
Only ONE of the Techstream units listed above is required.
Software version 11.20.019 or later is required.
Additional Techstream units may be ordered by calling Approved Dealer Equipment (ADE)
at 1-800-368-6787.
Additional SSTs may be ordered by calling 1-800-933-8335.
© 2016 Toyota Motor Sales, USA
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Rough Idle
Repair Procedure
1. Confirm condition as described in the Introduction. If ONLY the above DTCs are set, confirm
the presence of carbon build-up on the piston head. The presence of carbon can be
determined by using a Video Borescope. Using the Video Borescope, check for the presence
of excessive carbon build-up on each of the pistons.
Is carbon present on the piston heads?

YES — Continue to step 2.

NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
2. Start and warm the engine bringing the vehicle up to operating temperature (greater than
180°F/83°C ECT).
3. Disassemble the upper intake and remove the intake manifold.
Refer to the Technical Information System (TIS), applicable model and model year
Repair Manual:

2012 – 2013 iQ:
Engine/Hybrid System – Intake/Exhaust – “1NR-FE Intake/Exhaust: Intake
Manifold: Removal”
Figure 1.
Figure 2.
© 2016 Toyota Motor Sales, USA
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Rough Idle
Repair Procedure (Continued)
4. Remove the ignition coils and Spark Plugs.
Refer to TIS, applicable model and model year Repair Manual:

2012 – 2013 iQ:
Engine/Hybrid System – Engine Control – “1NR-FE Engine Control: Ignition Coil and Spark
Plug: Removal”
Figure 3.
Figure 4.
5. Disable the fuel injection system by removing the EFI Main 20A Fuse from the main fuse block
located in the driver’s side of the engine compartment.
NOTE
If the EFI Main 20A Fuse is NOT removed, the injector will fire during engine cranking causing
contamination of the Toyota Top Engine Cleaner.
6. Inject 30 ml of Toyota Top Engine Cleaner into each of the spark plug tubes, into the
combustion chamber. Using the starter, rotate the engine over for 10 – 15 seconds. (Cover the
spark plug tubes with a heavy towel to avoid cleaner exiting the cylinder.)
7. Allow the cylinders to soak for 60 minutes.
8. Inject 15 ml of Toyota Top Engine Cleaner into each of the spark plug tubes, into the
combustion chamber. Using the starter, rotate the engine over for about 15 seconds. (Cover
the spark plug tubes with a heavy towel to avoid cleaner exiting the cylinder.)
9. Allow the cylinders to soak for 60 minutes.
10. Repeat steps 8 – 9 one additional time.
11. Reinstall the original Spark Plugs. Do NOT install new Spark Plugs.
© 2016 Toyota Motor Sales, USA
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Rough Idle
Repair Procedure (Continued)
12. Install the NEW cylinder head cover.
NOTE
When installing the NEW cylinder head cover, be sure to remove the No.1 and No. 2 Camshaft
Position Sensor, along with the Ventilation Valve Sub-Assembly and the Camshaft Timing Oil
Control Valve Assembly from the old cylinder head cover. Reinstall them onto the NEW
cylinder head cover. Be sure to install NEW O-Rings on the Camshaft Timing Oil Control Valve
Assembly BEFORE installation.
Refer to TIS, applicable model and model year Repair Manual:

2012 – 2013 iQ:
Engine/Hybrid System – Engine Mechanical – “1NR-FE Engine Mechanical: Engine
Unit: Reassembly”
13. Reinstall the ignition coils.
Refer to TIS, applicable model and model year Repair Manual:

2012 – 2013 iQ:
Engine/Hybrid System – Engine Control – “1NR-FE Engine Control: Ignition Coil and Spark
Plug: Installation”
14. Reassemble the intake manifold and upper intake system.
Refer to TIS, applicable model and model year Repair Manual:

2012 – 2013 iQ:
Engine/Hybrid System – Intake/Exhaust – “1NR-FE Intake/Exhaust: Intake
Manifold: Installation”
15. Reinstall the original EFI Main 20A Fuse.
16. Start the engine and immediately raise the engine speed to 4,000 RPM and hold this engine
speed for a total of 15 minutes.
NOTE
During the initial start-up of the engine it is highly recommended to bring the vehicle to a
well-ventilated area or attach an exhaust hose. It is normal for smoke to be emitted from the
exhaust during the first few minutes of operation.
17. Change the engine oil and filter.
Refer to TIS, applicable model and model year Repair Manual:

2012 – 2013 iQ:
Engine/Hybrid System – Lubrication – “1NR-FE Lubrication: Oil and Oil
Filter: Replacement”
18. Using TIS Techstream, clear ANY DTCs that may have set.
19. Drive the vehicle for a total of 10 miles (16km).
20. Install NEW Spark Plugs.
© 2016 Toyota Motor Sales, USA
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Rough Idle
Repair Procedure (Continued)
21. Perform second engine oil and filter change.
NOTE
Inspect the Oil Filter Housing and PCV hose for pieces of carbon that may have broken off
during the above process, clean as necessary.
22. Confirm repair by clearing ANY codes that may have been present and by taking the vehicle
for a test drive. During the test drive, if DTCs were previously present, confirm that no new
DTCs related to the repair have come back. If vehicle exhibited rough idle condition, confirm
idle is now between 600 – 700 RPM.
© 2016 Toyota Motor Sales, USA