Toyota Tacoma (2015-2018) Service Manual: On-vehicle Inspection

ON-VEHICLE INSPECTION

CAUTION / NOTICE / HINT

HINT:

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

PROCEDURE

1. PERFORM SPARK TEST

(a) Check for DTCs (See page ).

NOTICE:

If any DTC is output, perform the troubleshooting procedures for that DTC.

(b) Check if sparks occur.

(1) Remove the 6 spark plugs and 6 ignition coil assemblies (See page ).

(2) Install the spark plug to the ignition coil assembly and connect the ignition coil assembly connector.

(3) Remove the engine room relay block cover.

(4) Remove the EFI MAIN No. 2 relay (EFI MAIN NO. 2) from the engine room relay block.

(5) Ground the spark plug.

(6) Visually check that sparks occur while the engine is being cranked.

2. INSPECT IGNITION COIL AND SPARK TEST

(a) Check that the wire harness side connector of the ignition coil assembly with igniter is securely connected.

Result

Result	Proceed to
NG	Connect securely
OK	Go to next step

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

HINT:

Perform "Inspection After Repair" after replacing an ignition coil assembly (See page ).

(1) If there is a cylinder where sparks do not occur, replace its ignition coil assembly with the ignition coil assembly of a cylinder where sparks occur normally.

(2) Crank the engine and visually check that sparks occur at the cylinder with the normally operating ignition coil assembly.

Result

Result	Proceed to
OK	Replace ignition coil assembly with igniter
NG	Go to next step

(c) Inspect the spark plug.

HINT:

Perform "Inspection After Repair" after replacing an spark plug (See page ).

(1) Replace the spark plug with a normal one.

(2) Perform spark test again.

Result

Result	Proceed to
OK	Replace spark plug
NG	Go to next step

(d) Check power supply to ignition coil assembly with igniter.

(1) Turn the engine switch to ON.

(2) Check that there is battery voltage at the ignition coil positive (+) terminal.

Result

Result	Proceed to
NG	Check wiring between engine switch and ignition coil assembly with igniter
OK	Go to next step

(e) Install the 6 spark plugs and 6 ignition coil assemblies (See page ).

(f) Install the EFI MAIN No. 2 relay (EFI MAIN NO. 2) to the engine room relay block.

(g) Install the engine room relay block cover.

3. INSPECT SPARK PLUG

HINT:

Perform "Inspection After Repair" after replacing an spark plug (See page ).

(a) Check the electrode.

(1) Using a megohmmeter, measure the insulation resistance. Text in Illustration *a Body Ground Standard Insulation Resistance Tester Connection Condition Specified Condition Spark plug (terminal part) - Body ground Always 10 MΩ or higher If a megohmmeter is not available, perform the following simple inspection.

(b) Alternative inspection method:

(1) Quickly accelerate the engine to 4000 rpm 5 times.

(2) Remove the spark plug.

(3) Visually check the spark plug.

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 on its threads and insulator.

HINT:

Perform "Inspection After Repair" after replacing an spark plug (See page ).

If there is damage, replace the spark plug. If not, reinstall the spark plug.

Recommended Spark Plug:

Manufacturer	Product
DENSO made	FK20HBR8

NOTICE:

When replacing a spark plug, replace it with the same type of spark plug that is installed on the vehicle.

(d) Check the spark plug electrode gap.

Maximum electrode gap for used spark plug:

1.1 mm (0.0433 in.)

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

Electrode gap for new spark plug:

0.7 to 0.8 mm (0.0276 to 0.0314 in.)

(e) Clean the spark plugs. If the electrode has traces of wet carbon, clean the electrode with a spark plug cleaner and then dry it. Air pressure: 588 kPa (6.0 kgf/cm2, 85 psi) Duration: 20 seconds or less HINT: Only use a spark plug cleaner when the electrode is free of oil. If the electrode has traces of oil, use gasoline to clean off the oil before using the spark plug cleaner.