Toyota Avalon Service & Repair Manual: On-vehicle Inspection

ON-VEHICLE INSPECTION

CAUTION / NOTICE / HINT

CAUTION:

To prevent injury due to contact with an operating cooling fan, keep your hands and clothing away from the cooling fans when working in the engine compartment with the engine running or the power switch on (IG).

PROCEDURE

1. PERFORM SPARK TEST

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

(e) Check for DTCs.

Powertrain > Engine > Trouble Codes

NOTICE:

If any DTCs are present, perform troubleshooting in accordance with the procedure for each DTC.

(f) Turn the power switch off.

(g) Remove the 4 ignition coil assemblies and 4 spark plugs.

Click here

(h) Remove the front wheel opening extension pad LH.

Click here

(i) Remove the front wheel opening extension pad RH.

Click here

(j) Remove the No. 1 engine under cover.

Click here

(k) Remove the No. 2 engine under cover assembly.

Click here

(l) Disengage the claw and raise the lock lever to disconnect the No. 6 engine wire connector as shown in the illustration.

NOTICE:

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

*a

Lock Lever

(m) Disconnect the No. 5 engine wire connector.

NOTICE:

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

(n) Install the spark plug to the ignition coil assembly, and then connect the ignition coil assembly connector.

(o) Turn the power switch on (IG).

(p) Turn the Techstream on.

(q) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display

Inspection Mode

(r) Ground the spark plug.

(s) Check that spark occurs at each spark plug while the engine is being cranked.

NOTICE:

  • Be sure to ground the spark plugs when checking them.
  • Do not crank the engine for more than 2 seconds.
  • If an ignition coil assembly or spark plug has been struck or dropped, replace it.

HINT:

  • If spark does not occur, perform the following procedure.
  • If spark does not occur for any cylinder, inspect the ignition circuit.

    Click here

(t) Connect the No. 5 engine wire connector.

(u) Connect the No. 6 engine wire connector and push down the lock lever to engage the claw as shown in the illustration.

*a

Lock Lever

(v) Install the No. 2 engine under cover assembly.

Click here

(w) Install the No. 1 engine under cover.

Click here

(x) Install the front wheel opening extension pad LH.

Click here

(y) Install the front wheel opening extension pad RH.

Click here

(z) Install the 4 ignition coil assemblies and 4 spark plugs.

Click here

(aa) Turn the power switch on (IG).

(ab) Turn the Techstream on.

(ac) Enter the following menus: Powertrain / Engine / Trouble Codes.

(ad) Check for DTCs.

Powertrain > Engine > Trouble Codes

(ae) Clear the DTCs.

Powertrain > Engine > Clear DTCs

2. INSPECT IGNITION COIL ASSEMBLY AND SPARK TEST

HINT:

Perform "Inspection After Repair" after replacing an ignition coil assembly or spark plug.

Click here

(a) Check that the ignition coil assembly connector is securely connected.

Result

Action

NG

Connect securely

OK

Go to next step

(b) Perform a spark test on each ignition coil assembly.

(1) Replace the ignition coil assembly with a known good one.

(2) Perform the spark test again.

Result

Action

NG

Go to next step

OK

Replace ignition coil assembly

NOTICE:

If an ignition coil assembly or spark plug has been struck or dropped, replace it.

(c) Perform a spark test on each spark plug.

(1) Replace the spark plug with a known good one.

(2) Perform the spark test again.

Result

Action

NG

Inspect ignition system

OK

Replace spark plug

NOTICE:

If an ignition coil assembly or spark plug has been struck or dropped, replace it.

(d) Connect the No. 5 engine wire connector.

(e) Connect the No. 6 engine wire connector and push down the lock lever to engage the claw as shown in the illustration.

*a

Lock Lever

(f) Install the No. 2 engine under cover assembly.

Click here

(g) Install the No. 1 engine under cover.

Click here

(h) Install the front wheel opening extension pad LH.

Click here

(i) Install the front wheel opening extension pad RH.

Click here

(j) Install the 4 ignition coil assemblies and 4 spark plugs.

Click here

(k) Turn the power switch on (IG).

(l) Turn the Techstream on.

(m) Enter the following menus: Powertrain / Engine / Trouble Codes.

(n) Check for DTCs.

Powertrain > Engine > Trouble Codes

(o) Clear the DTCs.

Powertrain > Engine > Clear DTCs

3. CHECK SPARK PLUG

NOTICE:

  • Do not damage the iridium tip and platinum tip.
  • Check the iridium tip visually since the iridium tip may be damaged.
  • Never attempt to adjust the electrode gap of a used spark plug.
  • Replace with new spark plugs if extremely dirty due to sludge, etc.
  • Replace with new spark plugs if damaged at all.
  • Replace with a new spark plug if it has been struck or dropped.
  • When replacing with a new spark plug, do not remove the cap for protecting the spark plug tip until it is installed to the engine.

HINT:

Perform "Inspection After Repair" after replacing a spark plug.

Click here

(a) Check the electrode.

(1) Using a megohmmeter, measure the insulation resistance.

Standard Insulation Resistance:

Tester Connection

Condition

Specified Condition

Spark plug (terminal part) - Body ground

Always

10 MΩ or higher

HINT:

  • If the result is not as specified, clean the spark plug with a spark plug cleaner and measure the resistance again.
  • If a megohmmeter is not available, perform the following simple inspection instead.

*a

Body Ground

(b) Alternative inspection method.

(1) Connect the Techstream to the DLC3.

(2) Turn the power switch on (IG).

(3) Turn the Techstream on.

(4) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display

Inspection Mode

(5) Start the engine.

NOTICE:

Do not perform this step when any of the following DTCs are output: P030000, P030027, P030085, P030100, P030200, P030300, P030400 (Cylinder Misfire Detected).

(6) Quickly accelerate the engine to 2500 rpm 5 times.

NOTICE:

Do not perform this step when any of the following DTCs are output: P030000, P030027, P030085, P030100, P030200, P030300, P030400 (Cylinder Misfire Detected).

(7) Remove the spark plug.

Click here

(8) Visually check the spark plug.

HINT:

If the electrode is dry, the spark plug is functioning properly. If the electrode is damp, proceed to the next step.

(c) Check the spark plug for any damage to its threads and insulator.

If there is any damage, replace the spark plug.

Recommended Spark Plug:

Manufacturer

Spark Plug Type

DENSO

FC16HR-Q8

(d) Check the spark plug electrode gap.

Maximum Electrode Gap for Used Spark Plug:

1.2 mm (0.0472 in.)

NOTICE:

Never attempt to adjust the electrode gap of a used spark plug.

If the spark plug electrode gap is more than the maximum, replace the spark plug.

Standard Electrode Gap for New Spark Plug:

0.7 to 0.8 mm (0.0276 to 0.0315 in.)

*a

Spark Plug Electrode Gap

(e) Install the spark plug.

Click here

4. PERFORM INITIALIZATION

(a) Perform "Inspection After Repair" after replacing an ignition coil assembly or spark plug.

Click here

    Ignition System

    Parts Location

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