On-Vehicle Inspection [11/2016 - ]: Procedure

WARNING: This page is about a different car, the 2019 Toyota Highlander, 2018 Toyota Highlander, and 2017 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT ENGINE COOLANT
Refer to ON-VEHICLE INSPECTION [11/2016 - ]
INSPECT ENGINE OIL
Refer to ON-VEHICLE INSPECTION [11/2016 - ]
CHECK BATTERY CONDITION
w/ Battery Current Sensor: Refer to ON-VEHICLE INSPECTION [11/2016 - ]

w/o Battery Current Sensor: Refer to ON-VEHICLE INSPECTION [11/2016 - ]
INSPECT SPARK PLUG
Refer to ON-VEHICLE INSPECTION [11/2016 - ]
INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
1. Remove the air cleaner filter element sub-assembly.
2. Visually check that the air cleaner filter element sub-assembly is not damaged or excessively oily.
  HINT:
  - If there is any dirt or clogs in the air cleaner filter element sub-assembly, clean it with compressed air.
  - If any dirt or clogs remain even after cleaning the air cleaner filter element sub-assembly with compressed air, replace it.
3. Install the air cleaner filter element sub-assembly.
INSPECT V-RIBBED BELT
Refer to Exploded View Of ON-VEHICLE INSPECTION [11/2016 - ]
INSPECT V-RIBBED BELT TENSIONER ASSEMBLY
1. Remove the V-ribbed belt.
  Refer to REMOVAL [11/2016 - ]
2. Turn the V-ribbed belt tensioner assembly clockwise and counterclockwise and check that it turns smoothly and does not catch.
  HINT:
  
  If the V-ribbed belt tensioner assembly does not turn smoothly or catches, replace the V-ribbed belt tensioner assembly.
3. Install the V-ribbed belt.
  Refer to INSTALLATION [11/2016 - ]
INSPECT VALVE LASH ADJUSTER ASSEMBLY NOISE
1. Rev up the engine several times. Check that the engine does not emit unusual noises.
2. If unusual noises occur, warm up the engine and idle it for 30 minutes or more, then perform the inspection.
  HINT:
  
  If any defects or problems are found during the inspection, perform valve lash adjuster assembly inspection.
  
  See step 2

INSPECT IGNITION TIMING

NOTE:

Check the ignition timing with the cooling fans off.
Turn off all the electrical systems and the A/C.
When checking the ignition timing, the transaxle should be in neutral or park.

Warm up and stop the engine.

When using the Techstream:

Connect the Techstream to the DLC3.
Start the engine and run it at idle.
Turn the Techstream on.

Enter the following menus: Powertrain / Engine / Data List / Ignition Timing Cylinder #1.

Powertrain > Engine > Data List

Tester Display
Ignition Timing Cylinder #1

Standard Ignition Timing

12 to 24° BTDC at idle

Check that the ignition timing advances immediately when the engine speed is increased.

Enter the following menus: Powertrain / Engine / Active Test / Activate the TC Terminal / ON.

Powertrain > Engine > Active Test

Active Test Display
Activate the TC Terminal

Data List Display
Ignition Timing Cylinder #1

Monitor IGN Advance of the Data List.
Standard Ignition Timing

8 to 12° BTDC at idle

When not using the Techstream:

Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3.

SST: 09843-18040

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DLC3

NOTE:

Confirm the terminal numbers before connecting them. Connecting the wrong terminals may damage electrical components.

Disengage the 2 claws and open the cover.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Connect the clip of the timing light to the ignition coil wire for the No. 1 cylinder.

NOTE:

Use a timing light that detects primary signals.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Start the engine and run it at idle.

Check the ignition timing at idle.

Standard Ignition Timing

8 to 12° BTDC at idle

HINT:

If the cutout of the crankshaft pulley is approximately aligned the protrusion (10° CA BTDC) of the timing chain cover assembly, the ignition timing meets the standard.
Run the engine at 1000 to 1300 rpm for 5 seconds, and then check that the engine speed returns to engine idle speed.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Cutout
*b	10° BTDC
*c	TDC

Disconnect terminals 13 (TC) and 4 (CG) of the DLC3.
Check the ignition timing at idle.
Standard Ignition Timing

12 to 24° BTDC at idle
Confirm that the ignition timing advances immediately when the engine speed is increased.
Disconnect the clip of the timing light from the ignition coil wire for the No. 1 cylinder.
Close the cover and engage the 2 claws.

INSPECT ENGINE IDLE SPEED

NOTE:

Check the idle speed with the cooling fans off.
Turn off all the electrical systems and the A/C.
When checking the idle speed, the transaxle should be in neutral or park.

Warm up and stop the engine.

When using the Techstream:

Connect the Techstream to the DLC3.
Start the engine and run it at idle.
Turn the Techstream on.

Enter the following menus: Powertrain / Engine / Data List / Engine Speed.

Powertrain > Engine > Data List

Tester Display
Engine Speed

Read the value displayed on the Techstream.
Standard Idle Speed

650 to 750 rpm

When not using the Techstream:

Using SST, connect a tachometer probe to terminal 9 (TAC) of the DLC3.

SST: 09843-18030

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DLC3

NOTE:

Be sure to connect the tachometer probe to the correct terminal. Connecting to the wrong terminal may result in damage to electrical components.

Start the engine and run it at idle.
Check the idle speed.
Standard Idle Speed

650 to 750 rpm
Turn the engine switch off.
Disconnect the tachometer probe from terminal 9 (TAC) of the DLC3.

INSPECT COMPRESSION

NOTE:

Keep the intake manifold and spark plug holes free of foreign matter when measuring the compression pressure.

Warm up and stop the engine.
Check for DTCs.
Refer to DTC CHECK / CLEAR [11/2016 - ]
Remove the 6 spark plugs.
Refer to REMOVAL [11/2016 - ]

Disconnect the 2 No. 5 engine wire connectors (for Port Injection).

NOTE:

Perform this step in order to stop fuel injection to prevent damage to the catalyst due to unburned fuel.

Disconnect the No. 6 engine wire connector and No. 7 engine wire connector (for Direct Injection).

NOTE:

Perform this step in order to stop fuel injection to prevent damage to the catalyst due to unburned fuel.

Check the cylinder compression pressure.

Insert a compression gauge into the spark plug hole.
While cranking the engine, measure the compression pressure.
Standard Compression Pressure

1400 kPa (14.3 kgf/cm² , 203 psi)

Minimum Compression Pressure

1050 kPa (10.7 kgf/cm² , 152 psi)

Pressure Difference between Each Cylinder

200 kPa (2.0 kgf/cm² , 29 psi) or less
NOTE:
- Always use a fully charged battery to obtain an engine speed of 250 rpm or more.
- Inspect all cylinders in the same way.
- Measure the compression pressure as quickly as possible.
If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole then inspect the cylinder compression pressure again.
HINT:
- If adding oil increases the compression pressure, the piston rings and/or cylinder bore may be worn or damaged.
- If the compression pressure stays low, a valve may be stuck or seated improperly, or there may be leaks in the cylinder head gasket.

Connect the No. 6 engine wire connector and No. 7 engine wire connector (for Direct Injection).
Connect the 2 No. 5 engine wire connectors (for Port Injection).
Install the 6 spark plugs.
Refer to INSTALLATION [11/2016 - ]
Clear the DTCs.
Refer to DTC CHECK / CLEAR [11/2016 - ]

NOTE:
After performing the inspection, clear the DTCs and confirm that DTCs are not stored again or that the normal system code is output if using a check wire.

INSPECT CO/HC

HINT:

This check determines whether or not the idle CO/HC complies with regulations.

Start the engine.
Run the engine speed at 2500 rpm for approximately 180 seconds.
Insert a CO/HC meter testing probe at least 40 cm (1.31 ft.) into the tailpipe during idle.

Immediately check the CO/HC concentration at idle and then at an engine speed of 2500 rpm.

HINT:

When performing a 2 mode test (with the engine idling/running at 2500 rpm), the measurement procedures are determined by applicable local regulations.

If the CO/HC concentration does not comply with the regulations, perform troubleshooting in the order given below.

Check for DTCs.
Refer to DTC CHECK / CLEAR [11/2016 - ]

See the following table for possible causes, then inspect the applicable parts and repair them if necessary.

CO	HC	Problem	Cause
Normal	High	Rough idle	Faulty ignition: Incorrect valve timing Fouled, shorted or improperly gapped spark plugs Incorrect valve clearance (valve lash adjuster assembly) Leaks in intake or exhaust valves Leaks in cylinders
Low	High	Rough idle (Fluctuating HC reading)	Vacuum leaks: PCV hoses Intake manifold Throttle with motor body assembly Brake booster line Lean mixture causing misfire
High	High	Rough idle (Black smoke from exhaust)	Restricted air cleaner filter element sub-assembly Plugged PCV valve Faulty SFI system: Fuel pressure regulator assembly Engine coolant temperature sensor Mass air flow meter sub-assembly ECM Fuel injector assemblies Throttle position sensor (built into throttle with motor body assembly)