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

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

I1 VERIFY FLASH CODE 4
- 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: Measuring Resistance Between Speed Control Actuator C122-2, Circuit 199 (LB/YE), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : INSTALL a new speed control actuator. REFER to SPEED CONTROL ACTUATOR in this article. TEST the system for normal operation.

No : If automatic transaxle, GO to I2.

If manual transaxle, GO to I4.
I2 CHECK THE TRANSMISSION RANGE (TR) SENSOR
- 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.
I3 CHECK THE TR SENSOR GROUND CIRCUIT
- 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.
I4 CHECK THE CLUTCH PEDAL POSITION (CPP) SWITCH
- 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.
I5 CHECK CIRCUIT 199 (LB/YE) FOR AN OPEN
- 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 An 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.
I6 CHECK CIRCUIT 359 (GY/RD) FOR AN OPEN
- 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 An 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.
I7 CHECK FOR CORRECT PCM MODULE 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 ELECTRONIC ENGINE 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.