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Home >> Dodge and Ram >> 1993 >> Intrepid Base, 3.5 F >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 3.3L/3.5L >> Fault Code Tests >> Test FC-33A - Knock Sensor #2 Circuit (DTC 16)
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Test FC-33A - Knock Sensor #2 Circuit (DTC 16)

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For appropriate wiring diagram, see WIRING DIAGRAMS  at end of article.
  1. Using DRB-II, erase faults. Start engine and let idle. If knock sensor fault returns, go to step 5). If knock sensor fault does not return, go to next step.
  2. Wiggle knock sensor wiring harness between knock sensor and Powertrain Control Module (PCM). If knock sensor fault returns, repair harness between components where wiggling caused fault to return. Perform TEST VER-2. If knock sensor fault did not return, go to next step.
  3. At this time, the condition required to set fault is not present. KNOCK SENSOR #2 CIRCUIT fault sets if sensor output falls below a minimum value at idle or deceleration. Knock sensor fault also sets if sensor output is more than 5 volts. Possible causes are: knock sensor output wire open, knock sensor output wire shorted to ground or voltage, or knock sensor failure.
  4. Inspect wiring and connectors. Repair as required. Perform TEST VER-2. If wiring and connectors are okay, see INACTIVE FAULT CONDITION . Perform TEST VER-2.
  5. If knock sensor fault returned in step 1), turn ignition off. Disconnect PCM connector. Disconnect No. 2 (right) knock sensor at common connector. Place DRB-II in ohmmeter mode. Using DRB-II, check resistance of PCM connector terminal No. 10 (Gray/Black wire).
  6. If resistance is less than 5 ohms, repair (Gray/Black wire) No. 2 (right) knock sensor signal wire for short to ground. Perform TEST VER-2. If resistance is more than 5 ohms, turn ignition off.
  7. Place DRB-II in voltmeter mode. Using DRB-II, check voltage of PCM connector terminal No. 10 (Gray/Black wire). If voltage is more than 5 volts, repair (Gray/Black wire) No. 2 (right) knock sensor signal wire for short to voltage. Perform TEST VER-2. If voltage is less than 5 volts, go to next step.
  8. Using an external ohmmeter, check resistance of sensor signal wire (Gray/Black wire) between No. 2 (right) knock sensor connector and PCM connector terminal No. 10.
  9. If resistance is less than 5 ohms, replace No. 2 (right) knock sensor. Perform TEST VER-2. If resistance is more than 5 ohms, repair open No. 2 (right) knock sensor signal wire (Gray/Black wire). Perform TEST VER-2.
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