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HOMESERVICE MANUALSMAZDA2005B2300 AUTOMATICREPAIR AND DIAGNOSISELECTRICALCHARGING SYSTEMSSYMPTOM TROUBLESHOOTING [ENGINE)SYMPTOM TROUBLESHOOTING CHART - CRUISE CONTROLSYMPTOM TROUBLESHOOTING CHARTCRUISE CONTROL SYSTEM PINPOINT TEST 10: FLASH CODE 4 - SPEED SIGNAL CIRCUIT FAILURE
2005 Mazda B2300 Automatic

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

2005 Mazda B2300 AutomaticSECTION Cruise Control System Pinpoint Test 10: Flash Code 4 - Speed Signal Circuit Failure
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 DIAGNOSIS 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  .
G03728053Courtesy of MAZDA MOTORS CORP.
G03728054Courtesy of MAZDA MOTORS CORP.
G03728055Courtesy of MAZDA MOTORS CORP.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.