Ignition System: Testing and Inspection
1GR-FE IGNITION: IGNITION SYSTEM: ON-VEHICLE INSPECTION
1. PERFORM SPARK TEST
(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
NOTICE:
If any DTC is output, perform troubleshooting procedures for that DTC.
(b) Check if sparks occur.
(1) Remove the intake air surge tank Removal.
(2) Remove the 6 spark plugs Removal.
(3) Disconnect the 6 injector connectors.
(4) Install the spark plug to the ignition coil and connect the ignition coil connector.
(5) Remove the No. 2 engine room relay block cover.
(6) Remove the circuit opening relay (C/OPN) from the No. 2 engine room relay block.
Text in Illustration
(7) Ground the spark plug.
(8) Visually check that sparks occur while the engine is being cranked.
NOTICE:
* Install and test each spark plug and ignition coil individually, disconnecting the ignition coil and removing the spark plug when each test is complete.
* Be sure to ground the spark plug when checking.
* Replace the ignition coil if it receives an impact.
* Do not crank the engine for more than 2 seconds.
If spark does not occur, perform the following procedure.
(c) Check that the wire harness side connector of the ignition coil is securely connected.
Result
(d) Perform a spark test on each ignition coil.
(1) If there is a cylinder where sparks do not occur, replace its ignition coil with the ignition coil 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.
Result
(e) Inspect the spark plug.
(1) Replace the spark plug with a normal one.
(2) Perform spark test again.
Result
(1) Check that power is supplied to the ignition coil.
Text in Illustration
1 Turn the ignition switch to ON.
2 Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Result
(f) Install the 6 spark plugs Installation.
(g) Install the intake air surge tank Installation.
(h) Install the circuit opening relay (C/OPN) to the No. 2 engine room relay block.
(i) Install the engine room relay block cover.
(j) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(k) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
HINT
Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.
2. INSPECT SPARK PLUG
NOTICE:
* Do not use a wire brush for cleaning.
* Do not attempt to adjust the electrode gap of a used spark plug.
(a) Check the electrode.
Text in Illustration
(1) Measure the resistance according to the value(s) in the table below.
Standard Insulation Resistance:
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.
(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.
If there is damage, replace the spark plug. If not, reinstall the spark plug.
Recommended Spark Plug:
(d) Clean the spark plugs.
If the electrode has traces of wet carbon, clean the electrode with a spark plug cleaner and then dry with compressed air.
Air Pressure:
588 kPa (6 kgf/cm2, 85 psi)
Duration:
20 seconds or less
HINT
Only use the 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.
(e) Check the spark plug electrode gap.
Text in Illustration
Maximum electrode gap for used spark plug:
1.3 mm (0.0512 in.)
If the gap is more than the maximum, replace the spark plug.
Electrode gap for new spark plug:
1.0 to 1.1 mm (0.0394 to 0.0433 in.)