Circuit/System Testing
IMPORTANT:
- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
- If an engine mechanical noise can be heard, repair the condition before proceeding with this diagnostic. Refer to Symptoms - Engine Mechanical .
- Test for an intermittent and for a poor connection at the affected KS.
- With the ignition OFF, disconnect the affected KS.
- With the ignition OFF, measure the resistance for 100K ohms from the sensor signal terminal on the KS to a good ground with a DMM.
- If resistance does not measure 100K ohms, replace the affected KS.
- Connect the DMM between the terminal of the affected KS. Set the DMM to the 400 Hz scale, let stabilize at 0 Hz. Tap on engine block with a non-metallic object near the affected KS while observing the signal indicated on the DMM.
- If the DMM does not display a fluctuating frequency while tapping on the engine block then replace the affected KS.
- Turn the ignition ON, engine OFF. Set the DMM to the DC voltage scale. Measure for 4.2 mV from the KS signal circuit to a good ground with the DMM.
- If over 4.2 mV, turn the ignition OFF, disconnect the control module and test the KS signal circuit for a short to voltage.
- If under 4.2 mV, turn the ignition OFF, disconnect the control module test the KS signal circuit for an open, short to ground, or high resistance.
- Test for intermittent or poor connections at the control module.
- If all circuits test normal, replace the control module.
IMPORTANT:
DO NOT tap on plastic engine components.