Fault diagnosis of the electronic ignition system is carried out via the fuel injection control unit. See Electronic Engine Controls in Driveability & Emissions Controls for further information.
See Figure 1
Measure the length of the carbon point in the distributor cap. Standard length should be 0.49-0.47 in. (10-12mm). If not within specification, replace the carbon point.Distributor Cap and Rotor
See Figures 2, 3 and 4
- Inspect the distributor cap for any breather hole clogging, electrode cracks or damage, center carbon wear or weak spring action. Check the rotor for cracks and damage.
- Measure the insulation resistance of the cap and rotor. Resistance should be 50,000 ohms or more. If not, replace the cap and rotor.
- Check that the vacuum canister plunger actuates when vacuum is applied using a hand vacuum pump.
- Using an ohmmeter, check the signal generator. Connect the ohmmeter leads to the wiring harness. Resistance should be 130-190 ohms. Move a screwdriver close to and away from the coil iron core. The tester needle should deflect. If the signal generator fails any test, replace it.