Federal

CIRCUIT DIAGRAM









INSPECTION USING SCAN TOOL











HARNESS INSPECTION PROCEDURE

USING OSCILLOSCOPE
1. Run the engine at idle speed.





2. Connect the probe to the oscilloscope pick-up point as shown in the circuit diagram, and check the waveform.

TROUBLESHOOTING HINTS
- If an impact is suddenly felt during driving or the engine suddenly stalls during idling, try shaking the crankshaft position sensor during idling. If the engine stalls, the cause may be presumed to be improper or incomplete contact of the crankshaft position sensor 's connector.
- If the crankshaft position sensor output rpm is 0 rpm during cranking when the engine cannot be started, the cause may be presumed to be a malfunction of the crankshaft position sensor or a broken timing belt.
- If the indicated value of the crankshaft position sensor output rpm is 0 rpm during cranking when the engine cannot be started, the cause may be presumed to be a failure of the ignition coil's primary current to intermittently pulse correctly, so a malfunction of the ignition system circuitry, the ignition coil and/or the ignition power transistor is the probable cause.
- If idling is possible even though the crankshaft position sensor indicated rpm is a deviation from the standard value, the cause is usually a malfunction of something other than the crankshaft position sensor .
[Examples]
- Malfunction of the engine coolant temperature sensor.
- Malfunction of the idle speed control motor (idle air control motor).
- Improper adjustment of the standard idling speed.