Ignition Timing Reference Sensor Test - 5000CS Turbo
- Unplug top Black connector from plenum panel mount bracket located next to ignition coil. Connect ohmmeter between terminals No. 1 and 2 of unplugged connector. See Fig 1. Resistance should be about 1000 ohms.
- If not, replace ignition timing reference sensor. If reading is correct, connect ohmmeter between terminals No. 1 and 3, then between terminals No. 2 and 3. Ohmmeter should indicate infinity.
- If reading is correct, replace ignition timing reference sensor. If reading is incorrect, check wiring and connections between reference sensor and control unit as follows.
- Remove control unit panel located on passenger side footwell. Unplug ignition control unit connector. Using an ohmmeter, check continuity between terminal No. 13 of control unit connector and terminal No. 1 of reference sensor connector.
- Check continuity between terminal No. 12 of control unit connector and terminal No. 2 of reference sensor connector. Also check continuity between terminal No. 28 of control unit connector and terminal No. 3 of reference sensor connector.
- Ohmmeter reading should be close to zero ohms for all tests. If not, check for open circuit between ignition control unit and reference sensor. If wiring is okay, check clearance between sensor and reference pin on flywheel. If okay, replace ignition control unit.