Toyota Prius: Ignition System
Parts Location
PARTS LOCATION
ILLUSTRATION
| *1 | IGNITION COIL ASSEMBLY | *2 | SPARK PLUG |
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 fan when working in the engine compartment with the engine running or the ignition switch ON.
PROCEDURE
1. PERFORM SPARK TEST
Pre-procedure1
(a) Check for DTCs.
Powertrain > Engine > Trouble CodesNOTICE:
If any DTCs are output, perform troubleshooting in accordance with the procedure for each DTC.
(b) Remove the 4 ignition coil assemblies and 4 spark plugs.
HINT:
Click here
| (c) Disconnect the 4 fuel injector assembly connectors. NOTICE: Perform this step in order to stop fuel injection to prevent damage to the catalyst due to unburned fuel. |
|
(d) Install the spark plug to the ignition coil assembly, and then connect the ignition coil assembly connector.
(e) Put the engine in Inspection Mode (Maintenance Mode).
Powertrain > Hybrid Control > Utility| Tester Display |
|---|
| Inspection Mode |
(f) Ground the spark plug.
Procedure1
(g) 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.
Post-procedure1
(h) Connect the 4 fuel injector assembly connectors.
(i) Install the 4 spark plugs and 4 ignition coil assemblies.
HINT:
Click here
(j) Check for DTCs.
Powertrain > Engine > Trouble Codes(k) Clear the DTCs.
Powertrain > Engine > Clear DTCs2. INSPECT IGNITION COIL ASSEMBLY AND SPARK TEST
Pre-procedure1
(a) None
Procedure1
(b) Check that the ignition coil assembly connector is securely connected.
| Result | Action |
|---|---|
| NG | Connect securely |
| OK | Go to next step |
(c) 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.
(d) 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 the ignition system HINT:
|
| OK | Replace spark plug |
NOTICE:
If an ignition coil assembly or spark plug has been struck or dropped, replace it.
Post-procedure1
(e) Connect the 4 fuel injector assembly connectors.
(f) Install the 4 spark plugs and 4 ignition coil assemblies.
HINT:
Click here
(g) Check for DTCs.
Powertrain > Engine > Trouble Codes(h) Clear the DTCs.
Powertrain > Engine > Clear DTCs3. INSPECT SPARK PLUG
NOTICE:
- Be careful not to damage the iridium tip or platinum tip of the spark plug.
- Check the iridium tip visually as it is easily damaged.
- Never attempt to adjust the electrode gap of a used spark plug.
- If a spark plug is extremely dirty with oil, etc., replace it.
- Replace a spark plug if it is damaged.
- If a spark plug has been struck or dropped, replace it.
- When installing a new spark plug, do not remove the protective cap from the spark plug tip until just before installing the spark plug to the engine.
Pre-procedure1
(a) None
Procedure1
| (b) Check the electrode. (1) Using a megohmmeter, measure the insulation resistance. Standard Insulation Resistance:
HINT: If a megohmmeter is not available, perform the following simple inspection instead. |
|
Procedure2
(c) Alternative inspection method.
(1) Put the engine in Inspection Mode (Maintenance Mode).
Powertrain > Hybrid Control > Utility| Tester Display |
|---|
| Inspection Mode |
(2) 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).
(3) 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).
(4) Remove the spark plug.
HINT:
Click here
(5) 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.
(d) 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-CY9 |
| (e) Check the spark plug electrode gap. Maximum Electrode Gap for Used Spark Plug:
NOTICE: Never attempt to adjust the electrode gap of a used spark plug. If the electrode gap is more than the maximum, replace the spark plug. Standard Electrode Gap for New Spark Plug:
|
|
Post-procedure1
(f) Install the spark plug.
HINT:
Click here
4. PERFORM INITIALIZATION
(a) Perform "Inspection After Repair" after replacing a spark plug or ignition coil assembly.
HINT:
Click here
Toyota Prius (XW60) 2023-2025 Service Manual
Ignition System
Actual pages
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