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

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Refer to Wiring Diagrams MANUAL CLIMATE CONTROL SYSTEM 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 (10A) is OK.

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

P1 CHECK THE ENGINE COOLANT LEVEL

NOTE: Allow the engine to cool before checking the engine 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 P2

No	DIAGNOSE the low coolant condition. REFER to the appropriate procedure in the appropriate Engine System article Diagnosis and Testing.

P2 CHECK FOR AND CLEAR PCM (POWERTRAIN CONTROL MODULE) DIAGNOSTIC TROUBLE CODES 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 P3

No GO to P6

P3 CHECK THE CABIN HEATER COOLANT PUMP CIRCUITS FOR A SHORT TO VOLTAGE

Disconnect BJB fuse 8 (10A) or (20A).

Disconnect PCM, 2.7L C1232E, 3.3L C1551E, 3.5L C175E, 5.0L C1381E or 3.0L Power Stroke Diesel C1233B.

Disconnect Cabin heater coolant pump C163 Gasoline or C1810 Diesel.

Ignition ON.

Measure:

Gasoline engines

Positive Lead	Measurement / Action	Negative Lead
C163-2	Courtesy of FORD MOTOR COMPANY	Ground
C163-3	Courtesy of FORD MOTOR COMPANY	Ground

Diesel engine

Positive Lead	Measurement / Action	Negative Lead
C1810-2	Courtesy of FORD MOTOR COMPANY	Ground
C1810-3	Courtesy of FORD MOTOR COMPANY	Ground

Is there any voltage present?

Yes	REPAIR the circuit.

GO to P4

P4 CHECK THE CABIN HEATER COOLANT PUMP CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:

Gasoline engines

Positive Lead	Measurement / Action	Negative Lead
C163-2	Courtesy of FORD MOTOR COMPANY	Ground
C163-3	Courtesy of FORD MOTOR COMPANY	Ground

Diesel engine

Positive Lead	Measurement / Action	Negative Lead
C1810-2	Courtesy of FORD MOTOR COMPANY	Ground
C1810-3	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances greater than 10, 000 ohms?

Yes

GO to P5

No	REPAIR the circuit.

P5 CHECK THE CABIN HEATER COOLANT PUMP CIRCUITS FOR AN OPEN

Disconnect BJB C1035B.

Measure:

Gasoline engines

Positive Lead	Measurement / Action	Negative Lead
C163-1	Courtesy of FORD MOTOR COMPANY	Ground
C163-2	Courtesy of FORD MOTOR COMPANY	C1035B-47
C163-3	Courtesy of FORD MOTOR COMPANY	All Gasoline PCM E connectors pin 16

Diesel engine

Positive Lead	Measurement / Action	Negative Lead
C1810-1	Courtesy of FORD MOTOR COMPANY	Ground
C1810-2	Courtesy of FORD MOTOR COMPANY	C1035B-47
C1810-3	Courtesy of FORD MOTOR COMPANY	C1233B-64

Are the resistances less than 3 ohms?

Yes

GO to P6

No	REPAIR the circuit.

P6 CHECK FOR CORRECT CABIN HEATER COOLANT PUMP OPERATION

Ignition OFF.

Disconnect Cabin heater coolant pump C163 Gasoline or C1810 Diesel.

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-components.
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 the appropriate Engine Cooling System Draining, Vacuum Filling and Bleeding General Procedure in Group 303-03. If the cabin 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 the appropriate Removal and Installation procedure in GENERAL PROCEDURES . 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 P7

P7 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, Refer to PCM GUIDED ROUTINE TESTING

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.