Code 4: Crank Sensor
NOTE:
For wiring diagrams, see WIRING DIAGRAMS
article. For vacuum diagrams, see VACUUM DIAGRAMS
article.
- Turn ignition off. Remove hazard fuse at battery positive terminal for 10 seconds to reset ECU. Start engine and observe CHECK ENGINE and ECU LED lights. If lights are off, problem is intermittent. Check for poor or loose connections at distributor connector and connector C216 at right shock tower. Test drive and check again.
- If CHECK ENGINE light is on and LED indicates Code 4, turn ignition off. Disconnect 8-pin connector from TDC/Cyl/CRANK sensor connector at distributor. Measure resistance between terminals "C" and "D". See Fig 1 . If resistance is not 350-700 ohms, replace distributor assembly. If resistance is within specification, check for continuity between ground and terminals "C" and "D". If continuity exists, sensor is shorted to ground. Replace distributor assembly.
- If continuity to ground did not exist in step 2), reconnect 8-pin connector. Connect ECU test harness to ECU main harness side only. Measure resistance between ECU terminals B10 and B12. See Figure . If resistance is not 350-700 ohms, repair Orange and/or White wires between ECU and 8-pin connector.
- If resistance is within specification, check for continuity to ground on terminal B10. If continuity exists, repair short in Orange wire between B10 and distributor connector. If continuity to ground does not exist on B10, substitute a known good ECU. If condition goes away, replace original ECU.