Test Procedure

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

KU1 DIAGNOSTIC TROUBLE CODE (DTC) P2600: VERIFY THAT THE CONCERN IS PRESENT

Is DTC P2600 present in the KOEO or KOER self-test?

Yes	No
GO to KU2.	GO to KU8.

KU2 CHECK THE FUNCTIONALITY OF THE HPCR CIRCUIT AT THE RELAY

Key in OFF position.
HPCR connector disconnected.

Connect a non-powered test lamp between:

( + ) Vehicle Battery	( - ) HPCR Connector, Harness Side
Positive terminal	HPCR - Pin 2

Key ON, engine OFF.
Access the PCM and control the HPUMP PID.
Cycle the HPCR PID on and off.
Does the test lamp illuminate on and off when the HPCR output is commanded on and off?

Yes	No
GO to KU3.	GO to KU5.

KU3 CHECK THE VPWR VOLTAGE TO HPCR

Measure the voltage between:

( + ) HPCR Connector, Harness Side	( - ) Vehicle Battery
VPWR - Pin 1	Negative terminal

Is the voltage greater than 10.5 V?

Yes	No
GO to KU4.	REPAIR the circuit. CHECK the condition of related fuses/fuse links. If damaged, CHECK the VPWR circuit for a short to ground. CLEAR the DTCs. REPEAT the self-test.

KU4 CHECK THE HPCR RELAY RESISTANCE

Key in OFF position.

Measure the resistance between:

( + ) HPCR Connector, Component Side	( - ) HPCR Connector, Component Side
VPWR - Pin 1	HPCR - Pin 2

Is the resistance between 40 - 90 ohms?

Yes	No
Unable to duplicate or identify the concern at this time. GO to KU8.	INSTALL a new HPCR. CLEAR the DTCs. REPEAT the self-test.

KU5 CHECK THE HPCR CIRCUIT FOR AN OPEN IN THE HARNESS

Key in OFF position.
PCM connector disconnected.

Measure the resistance between:

( + ) PCM Connector, Harness Side	( - ) HPCR Connector, Harness Side
HPCR - Pin T23	HPCR - Pin 2

Is the resistance less than 5 ohms?

Yes	No
GO to KU6.	REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

KU6 CHECK THE HPCR CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS

Key ON, engine OFF.

Measure the voltage between:

( + ) PCM Connector, Harness Side	( - ) Vehicle Battery
HPCR - Pin T23	Negative terminal

Is the voltage less than 1 V?

Yes	No
GO to KU7.	REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

KU7 CHECK THE HPCR CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS

Key in OFF position.

Measure the resistance between:

( + ) PCM Connector, Harness Side	( - ) Vehicle Battery
HPCR - Pin T23	Negative terminal

Is the resistance greater than 10K ohms?

Yes	No
GO to KU9.	REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

KU8 CHECK THE HPCR CIRCUIT FOR AN INTERMITTENT CONCERN

PCM connector connected.
HPCR connector connected.
Key ON, engine OFF.
Access the PCM and control the HPUMP PID.
Command the HPCR ON.
Access the PCM and monitor the HPUMP_F PID.
Carefully wiggle all accessible wiring and connectors associated with the circuit and look for a change in the PID state.
Is a concern present during the wiggle test?

Yes	No
REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test.	refer to PINPOINT TEST Z .

KU9 CHECK FOR CORRECT PCM OPERATION

Disconnect all the PCM connectors.
Visually inspect for:
- pushed out pins
- corrosion
Connect all the PCM connectors and make sure they seat correctly.
Carry out the PCM self-test and verify the concern is still present.
Is the concern still present?

Yes	No
INSTALL a new PCM. REFER toFLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.