Ignition System: Service Precautions

Safety Precautions

If special testing equipment is required during road test, note the following:


Improperly secured testing and measuring equipment and distraction during a road test increase the risk of an accident.

The passenger airbag could pose a risk if it deploys in a collision.

• Operating testing equipment while driving causes it to shift position.

• There is an increased risk of injury due to unsecured testing equipment.

• Always secure testers on the rear seat with a strap and have a second person on the rear seat operate them.


Danger of causing damage to other electronic components when disconnecting the battery.

• Complete the steps for disconnecting the battery.

- Disconnect the battery.

To reduce the risk of personal injury and/or damage to the fuel injection and ignition system, always observe the following:

• Do not touch or remove ignition wires when the engine is running or turning at starter speed.

• Always switch ignition off before disconnecting or reconnecting wires for the ignition system, including high voltage wiring and test leads.

• If engine is to be cranked at starting RPM without starting (for example for compression testing), disconnect connectors from ignition coils and from fuel injectors. After performing work, check and erase Diagnostic Trouble Code (DTC) memory.

• Cleaning the engine should only be performed with ignition turned off.