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Cruise Control System Pinpoint Test 10: Flash Code 4 - Speed Signal Circuit Failure

CRUISE CONTROL SYSTEM PINPOINT TEST 10: FLASH CODE 4 - SPEED SIGNAL CIRCUIT FAILURE

PINPOINT TEST 10 FLASH CODE 4 - SPEED SIGNAL CIRCUIT FAILURE
STEP INSPECTION ACTION
1 CHECK THE SPEEDOMETER OPERATION
  • Check the speedometer for correct operation by driving the vehicle.
  • Does the speedometer operate correctly? 
 Yes Go to next step.
No See INSTRUMENT CLUSTER to diagnose the speedometer.
2 CHECK CIRCUIT GY/B FOR AN OPEN
  • Key in OFF position.
  • Disconnect: Speed Control Servo 0120-101.
  • Disconnect: Powertrain Control Module (PCM) 0140-175.
  • Measure the resistance between the PCM 0140-175 pin 68, circuit GY/B, harness side and the speed control servo 0120-101 pin 3, circuit GY/B, harness side.
  • Is the resistance less than 5 ohms? 
 Yes Go to next step.
No Repair the circuit. Test the system for normal operation. See SYMPTOM TROUBLESHOOTING CHART - CRUISE CONTROL  .
3 CHECK CIRCUIT GY/B FOR A SHORT TO GROUND
  • Disconnect: Instrument Cluster 0922-102.
  • Measure the resistance between the-speed control servo 0120-101 pin 3, circuit GY/B, harness side and ground.
  • Is the resistance greater than 10, 000 ohms? 
 Yes Install a new cruise control servo. See CRUISE CONTROL SERVO REMOVAL / INSTALLATION . Test the system for normal operation. See SYMPTOM TROUBLESHOOTING CHART - CRUISE CONTROL  .
No Repair the circuit. Test the system for normal operation. See SYMPTOM TROUBLESHOOTING CHART - CRUISE CONTROL  .
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