Pinpoint Test I: Flash Code 4 - Clutch/Neutral Switch Circuit Failure

• Key in OFF position.
• Disconnect: Speed Control Actuator C122.
• Key in ON position.
• Select NEUTRAL.
• Apply the clutch.
• Measure the resistance between the speed control actuator C122-2, circuit 199 (LB/YE), harness side and ground.
  Fig 1: Verifying Flash Code 4

  Courtesy of FORD MOTOR CO.
• Is the resistance less than 5 ohms? 

• Yes  : INSTALL a new speed control actuator. REFER to SPEED CONTROL ACTUATOR . TEST the system for normal operation.
• No  : If automatic transaxle, GO to I2.

If manual transaxle, GO to  I4.

• Fully apply the parking brake.
• Key in OFF position.
• Disconnect: TR Sensor C167.
• Select NEUTRAL.
• Measure the resistance between the TR sensor C167-9, component side and the TR sensor C167-4, component side.
  Fig 2: Checking Transmission Range (TR) Sensor

  Courtesy of FORD MOTOR CO.
• Is the resistance less than 5 ohms? 

• Yes  : GO to I3.
• No  : INSTALL a new TR sensor. REFER to AUTOMATIC TRANSAXLE-TRANSMISSION - CD4E A. REPEAT the self-test.

• Select PARK.
• Measure the resistance between the TR sensor C167-1, circuit 57 (BK), harness side and ground.
  Fig 3: Checking TR Sensor Ground Circuit

  Courtesy of FORD MOTOR CO.
• Is the resistance less than 5 ohms? 

• Yes  : REPAIR circuit 199 (LB/YE). REPEAT the self-test.
• No  : REPAIR circuit 57 (BK). REPEAT the self-test.

• Fully apply the parking brake.
• Key in OFF position.
• Disconnect: CPP Switch C2070.
• Measure the resistance between the CPP switch C2070-2, component side and the CPP switch C2070-4, component side while applying the clutch pedal.
  Fig 4: Checking Clutch Pedal Position (CPP) Switch

  Courtesy of FORD MOTOR CO.
• Is the resistance less than 5 ohms? 

• Yes  : GO to I5.
• No  : INSTALL a new CPP switch. REFER to ELECTRONIC ENGINE CONTROLS - 2.3L . REPEAT the self-test.

• Measure the resistance between the speed control actuator C122-2, circuit 199 (LB/YE), harness side and the CPP switch C2070-4, circuit 199 (LB/YE), harness side.
  Fig 5: Checking Circuit 199 (LB/YE) For Open

  Courtesy of FORD MOTOR CO.
• Is the resistance less than 5 ohms? 

• Yes  : GO to I6.
• No  : REPAIR the circuit. REPEAT the self-test.

• Disconnect: PCM C175b.
• Measure the resistance between the CPP switch C2070-2, circuit 359 (GY/RD), harness side and the PCM C175b-41, circuit 359 (GY/RD), harness side.
  Fig 6: Checking Circuit 359 (GY/RD) For Open

  Courtesy of FORD MOTOR CO.
• Is the resistance less than 5 ohms? 

• Yes  : GO to I7.
• No  : REPAIR the circuit. TEST the system for normal operation.

• Disconnect the PCM connectors.
• Check for:
  • corrosion
  • pushed-out pins
• Connect the PCM connectors and make sure they seat correctly.
• Operate the system and verify the concern is still present.
• Is the concern still presents? 

• Yes  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - 2.3L or FUEL CHARGING & CONTROLS - 3.0L (4V) . TEST the system for normal operation.
• No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.