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Pinpoint Test AE: P2600:00, P2601:00, P2602:00, P2603:00

WARNING: This page is about a different car, the 2023 Ford Bronco. However, it is still accessible from the selected car via links, so may be relevant.
  1. Refer to ELECTRONIC ENGINE CONTROLS - 2.7L for schematic and connector information. Refer to ELECTRONIC ENGINE CONTROLS - 2.3L for schematic and connector information.

    Normal Operation and Fault Conditions 

    Cabin Heater Coolant Pump, REFER to: Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System Operation and Component Description .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PCM P2600:00 Coolant Pump 'A' Control Circuit/Open: No Sub Type Information This DTC sets when the PCM senses an open on the cabin heater coolant pump circuits.
    PCM P2601:00 Coolant Pump 'A' Control Circuit Performance/Stuck Off: No Sub Type Information This DTC sets when the PCM senses any of the following conditions:
    Dry-Run leads to cabin heater coolant pump running without resistance
    Over Temperature
    Over/Under Voltage
    Impeller Stall
    Impeller Speed below minimum speed
    Internal Error
    Pump communication signal unrecognized
    PCM P2602:00 Coolant Pump 'A' Control Circuit Low: No Sub Type Information This DTC sets when the PCM senses low voltage on the PWM circuit when commanding it high, indicating a short to ground to the cabin heater coolant pump.
    PCM P2603:00 Coolant Pump 'A' Control Circuit High: No Sub Type Information This DTC sets when the PCM senses low voltage on the PWM circuit when commanding it high, indicating an open circuit to the cabin heater coolant pump.

    Possible Sources 

    • Wiring, terminals or connectors
    • Low coolant or air in the coolant system
    • Cabin heater coolant pump
    • PCM

    Visual Inspection and Pre-checks 

    • Make sure BJB fuse 8 (20A) is OK.

    NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

  2. AE1 CHECK THE COOLANT LEVEL

    NOTE: Allow the engine drivetrain to cool before checking the coolant level.

    • Make sure that the vehicle is on a level surface.

    • Make sure that the steering wheel is set to the straight ahead position.

    • Ignition OFF.

    • Visually inspect the engine coolant level at the degas bottle.

    Is the coolant level within specifications? 

    Yes  GO to AE2 
    No  DIAGNOSE the low coolant condition. REFER to: Engine Cooling . REFER to: Engine Cooling .

  3. AE2 CHECK FOR AND CLEAR PCM (POWERTRAIN CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS) AND COMMAND THE CABIN HEATER COOLANT PUMP ON

    • Ignition ON.

    • Using a diagnostic scan tool, CARRY OUT the PCM self-test. Record the PCM Diagnostic Trouble Codes (DTCs). CLEAR all PCM Diagnostic Trouble Codes (DTCs).

    • Using the diagnostic scan tool, active command the cabin heater coolant pump on and allow it to run for a minimum of 5 minutes and monitor the status of the cabin heater coolant pump status PID. Confirm if the cabin heater coolant pump is running by feeling or hearing the pump for vibration.

    Access the PCM and control the COOLANT_PMP_APID

    Access the PCM and monitor the COOLPMP_A_STATPID

    Is DTC P2600, P2601, P2602 or P2603 received or is the coolant pump not running? 

    Yes  GO to AE3 
    No  GO to AE6 

  4. AE3 CHECK THE CABIN HEATER COOLANT PUMP CIRCUITS FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect BJB fuse 8 (20A).

    • Disconnect Cabin heater coolant pump C1450 (2.3L) or C163 (2.7L).

    • Ignition ON.

    • Measure:

      2.3L 

      Positive Lead Measurement / Action Negative Lead
      C1450 Pin 2
      GFD758227Courtesy of FORD MOTOR COMPANY
      		 Ground
      C1450 Pin 3
      GFD758227Courtesy of FORD MOTOR COMPANY
      		 Ground

    • Measure:

      2.7L 

      Positive Lead Measurement / Action Negative Lead
      C163 Pin 2
      GFD758227Courtesy of FORD MOTOR COMPANY
      		 Ground
      C163 Pin 3
      GFD758227Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is there any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to AE4 

  5. AE4 CHECK THE CABIN HEATER COOLANT PUMP CIRCUITS FOR A SHORT TO GROUND

    • Ignition OFF.

    • Measure:

      2.3L 

      Positive Lead Measurement / Action Negative Lead
      C1450 Pin 2
      GFD758228Courtesy of FORD MOTOR COMPANY
      		 Ground
      C1450 Pin 3
      GFD758228Courtesy of FORD MOTOR COMPANY
      		 Ground

    • Measure:

      2.7L 

      Positive Lead Measurement / Action Negative Lead
      C163 Pin 2
      GFD758228Courtesy of FORD MOTOR COMPANY
      		 Ground
      C163 Pin 3
      GFD758228Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to AE5 
    No  REPAIR the circuit.

  6. AE5 CHECK THE CABIN HEATER COOLANT PUMP CIRCUITS FOR AN OPEN

    • Measure:

      2.3L 

      Positive Lead Measurement / Action Negative Lead
      C1450 Pin 1
      GFD758228Courtesy of FORD MOTOR COMPANY
      		 Ground

      2.3L 

      Positive Lead Measurement / Action Negative Lead
      C1450 Pin 2
      GFD758228Courtesy of FORD MOTOR COMPANY
      		 BJB fuse 8 (20A) socket (component side)

      2.3L 

      Positive Lead Measurement / Action Negative Lead
      C1450 Pin 3
      GFD758228Courtesy of FORD MOTOR COMPANY
      		 C175B Pin 40

    • Measure:

      2.7L 

      Positive Lead Measurement / Action Negative Lead
      C163 Pin 1
      GFD758228Courtesy of FORD MOTOR COMPANY
      		 Ground

      2.7L 

      Positive Lead Measurement / Action Negative Lead
      C163 Pin 2
      GFD758228Courtesy of FORD MOTOR COMPANY
      		 BJB fuse 8 (20A) socket (component side)

      2.7L 

      Positive Lead Measurement / Action Negative Lead
      C163 Pin 3
      GFD758228Courtesy of FORD MOTOR COMPANY
      		 C1551E Pin 16

    Are the resistances less than 3 ohms? 

    Yes  GO to AE6 
    No  REPAIR the circuit.

  7. AE6 CHECK FOR CORRECT CABIN HEATER COOLANT PUMP OPERATION

    • Ignition OFF.

    • Disconnect Cabin heater coolant pump C1450 (2.3L) or C163 (2.7L).

    • Repair:

      • corrosion (replace connector or terminals - clean module pins)
      • damaged or bent pins - replace terminals/pins
      • pushed-out pins - replace pins as necessary

    • Connect all disconnected connectors.

      Make sure they seat and latch correctly  .

    • Ignition ON.

    • Using a diagnostic scan tool, CLEAR all PCM Diagnostic Trouble Codes (DTCs) and CARRY OUT the PCM self-test.

    • Using the diagnostic scan tool, active command the cabin heater coolant pump on and allow it to run for a minimum of 5 minutes and monitor the status of the cabin heater coolant pump status PID. Confirm if the cabin heater coolant pump is running by feeling or hearing the pump for vibration.

    Access the PCM and control the COOLANT_PMP_APID

    Access the PCM and monitor the COOLPMP_A_STATPID

    Does the cabin heater coolant pump run? 

    Yes  If the cabin heater coolant pump runs for 10 seconds on and 10 seconds off for the first 2 minutes, and tries to restart every 10 seconds, BLEED the air from the coolant system. REFER to: Engine Cooling System Draining, Vacuum Filling and Bleeding . REFER to: Engine Cooling System Draining, Vacuum Filling and Bleeding
    (303-03B Engine Cooling - 2.7L EcoBoost (238kW/324PS), General Procedures). If the cabin heater coolant pump runs continuously, the system is operating correctly at this time. The concern may have been caused by pump connections. ADDRESS the root cause of any connector or pin issues.
    No  INSTALL a new cabin heater coolant pump. REFER to: Cabin Heater Coolant Pump - 2.3L EcoBoost (199kW/270PS) . REFER to: Cabin Heater Coolant Pump - 2.7L EcoBoost (238kW/324PS) . CLEAR all Diagnostic Trouble Codes (DTCs). CARRY OUT the PCM self-test. TEST the system for normal operation. If the concern is still present, GO to AE7 

  8. AE7 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect the PCM connectors.

    • Repair:

      • corrosion (replace connector or terminals - clean module pins)
      • damaged or bent pins - replace terminals/pins
      • pushed-out pins - replace pins as necessary

    • Connect the PCM connectors. Make sure they seat and latch correctly.

    • Operate the system and verify the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new PCM. Refer to POWERTRAIN CONTROL MODULE (PCM) - 2.3L EcoBoost (199kW 270PS) , or refer to POWERTRAIN CONTROL MODULE (PCM) - 2.7L EcoBoost (238kW 324PS) , or refer to POWERTRAIN CONTROL MODULE (PCM) - 3.0L EcoBoost (299kW 406PS) (DD) .
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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