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.

KF1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) P0480, P0481 AND P0482

Are any of the following DTCs present during PCM or transaxle control module (TCM) self-test P0480, P0481, or P0482?

Yes	No
For KOEO and KOER DTC P0480, GO to KF2. For KOEO and KOER DTC P0481, GO to KF12. For KOEO and KOER DTC P0482, GO to KF7. For continuous memory DTC P0480, GO to KF17. For continuous memory DTC P0481, GO to KF19. For continuous memory DTC P0482, GO to KF21.	Symptom diagnostics are required. For cooling fan always runs: GO to KF23. For cooling fan does not operate: GO to KF26.

KF2 KOEO AND KOER DTC P0480: CHECK THE VPWR VOLTAGE TO LOW SPEED FC RELAY

LFC Relay connector disconnected.
Key ON, engine OFF.

Measure the voltage between:

( + ) LFC Relay Connector, Harness Side	( - ) Vehicle Battery
VPWR - Pin 2	Negative terminal

Is the voltage greater than 10.5 V?

Yes	No
GO to KF3.	REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

KF3 CHECK FOR LFC CIRCUIT CYCLING

NOTE: During KOEO on demand self-test, the LFC circuit will be cycled on and off.

Connect a non-powered test lamp between:

( + ) LFC Relay Connector, Harness Side	( - ) LFC Relay Connector, Harness Side
VPWR - Pin 2	LFC - Pin 1

Carry out the PCM KOEO on demand self-test.
Does the test lamp illuminate on and off during the KOEO on demand self-test?

Yes	No
INSTALL a new LFC relay. CLEAR the DTCs. REPEAT the self-test.	REMOVE the test lamp. GO to KF4.

KF4 CHECK THE LFC CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS

Key in OFF position.
PCM connector disconnected.
Key ON, engine OFF.

Measure the voltage between:

( + ) LFC Relay Connector, Harness Side	( - ) Vehicle Battery
LFC - Pin 1	Negative terminal

Is the voltage less than 1 V?

Yes	No
GO to KF5.	REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

KF5 CHECK THE LFC CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS

Measure the resistance between:

( + ) LFC Relay Connector, Harness Side	( - ) Vehicle Battery
LFC - Pin 1	Negative terminal

Is the resistance greater than 10K ohms?

Yes	No
GO to KF6.	REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

KF6 CHECK THE LFC CIRCUIT FOR AN OPEN IN THE HARNESS

Measure the resistance between:

( + ) LFC Relay Connector, Harness Side	( - ) PCM Connector, Harness Side
LFC - Pin 1	LFC - Pin B38

Is the resistance less than 5 ohms?

Yes	No
INSTALL a new PCM. REFER toFLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .	REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

KF7 KOEO AND KOER DTC P0482: CHECK THE VPWR VOLTAGE TO MEDIUM SPEED FC RELAY

MFC Relay connector disconnected.
Key ON, engine OFF.

Measure the voltage between:

( + ) MFC Relay Connector, Harness Side	( - )
VPWR - Pin 2	Ground

Is the voltage greater than 10.5 V?

Yes	No
GO to KF8.	REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

KF8 CHECK FOR MFC CIRCUIT CYCLING

NOTE: During KOEO on demand self-test, the MFC circuit will be cycled on and off.

Connect a non-powered test lamp between:

( + ) MFC Relay Connector, Harness Side	( - ) MFC Relay Connector, Harness Side
VPWR - Pin 2	MFC - Pin 1

Carry out the PCM KOEO on demand self-test.
Does the test lamp illuminate on and off during the KOEO on demand self-test?

Yes	No
INSTALL a new MFC relay. CLEAR the DTCs. REPEAT the self-test.	REMOVE the test lamp. GO to KF9.

KF9 CHECK THE MFC CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS

Key in OFF position.
PCM connector disconnected.
Key ON, engine OFF.

Measure the voltage between:

( + ) MFC Relay Connector, Harness Side	( - )
MFC - Pin 1	Ground

Is the voltage less than 1 V?

Yes	No
GO to KF10.	REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

KF10 CHECK THE MFC CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS

Key in OFF position.

Measure the resistance between:

( + ) MFC Relay Connector, Harness Side	( - )
MFC - Pin 1	Ground

Is the resistance greater than 10K ohms?

Yes	No
GO to KF11.	REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

KF11 CHECK THE MFC CIRCUIT FOR AN OPEN IN THE HARNESS

Measure the resistance between:

( + ) MFC Relay Connector, Harness Side	( - ) PCM Connector, Harness Side
MFC - Pin 1	MFC - Pin B33

Is the resistance less than 5 ohms?

Yes	No
INSTALL a new PCM. REFER toFLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .	REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

KF12 KOEO AND KOER DTC P0481: CHECK THE VPWR VOLTAGE TO THE HIGH SPEED FC RELAY

HFC Relay connector disconnected.
Key ON, engine OFF.

Measure the voltage between:

( + ) HFC Relay Connector, Harness Side	( - )
VPWR - Pin 2	Ground

Is the voltage greater than 10.5 V?

Yes	No
GO to KF13.	REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

KF13 CHECK FOR HFC CIRCUIT CYCLING

NOTE: During KOEO on demand self-test, the HFC circuit will be cycled on and off.

Connect a non-powered test lamp between:

( + ) HFC Relay Connector, Harness Side	( - ) HFC Relay Connector, Harness Side
VPWR - Pin 2	HFC - Pin 1

Carry out the KOEO on demand self-test.
Does the test lamp illuminate on and off during the KOEO on demand self-test?

Yes	No
INSTALL a new HFC relay. CLEAR the DTCs. REPEAT the self-test.	REMOVE the test lamp. GO to KF14.

KF14 CHECK THE HFC CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS

PCM connector disconnected.
Key ON, engine OFF.

Measure the voltage between:

( + ) HFC Relay Connector, Harness Side	( - ) Vehicle Battery
HFC - Pin 1	Negative terminal

Is the voltage less than 1 V?

Yes	No
GO to KF15.	REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

KF15 CHECK THE HFC CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS

Measure the resistance between:

( + ) HFC Relay Connector, Harness Side	( - ) Vehicle Battery
HFC - Pin 1	Negative terminal

Is the resistance greater than 10K ohms?

Yes	No
GO to KF16.	REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

KF16 CHECK THE HFC CIRCUIT FOR AN OPEN IN THE HARNESS

Measure the resistance between:

( + ) HFC Relay Connector, Harness Side	( - ) PCM Connector, Harness Side
HFC - Pin 1	HFC - Pin B37

Is the resistance less than 5 ohms?

Yes	No
INSTALL a new PCM. REFER toFLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .	REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

KF17 CONTINUOUS MEMORY DTC P0480: CHECK THE LFC CIRCUIT FOR AN INTERMITTENT OPEN OR SHORT TO VOLTAGE

A/C and defrost off.
Left Fan Motor connector disconnected.
Right Fan Motor connector disconnected.

Connect a non-powered test lamp between:

( + ) Left Fan Motor Connector, Harness Side	( - ) Left Fan Motor Connector, Harness Side
LSFAN PWR - Pin 2	GND - Pin 3

Key ON, engine OFF.
Enter output test mode. Refer toOUTPUT TEST MODE (OTM) .
Command the low speed fan ON.
Observe the test lamp for an indication of a concern while carrying out the following. Note that the lamp turns off when a concern is detected.
- Shake, wiggle, and bend the LFC circuit(s).
- Shake, wiggle, and bend the VPWR circuit to the LFC relay.
- Lightly tap on the low speed FC relay to simulate road shock
Is a concern present?

Yes	No
ISOLATE the concern and REPAIR as necessary.	GO to KF18.

KF18 CHECK THE LFC CIRCUIT FOR AN INTERMITTENT SHORT TO GROUND

Key ON, engine OFF.
Command the outputs OFF.
Observe the test lamp for an indication of a concern while completing the following. Note that the lamp turns on when a concern is detected.
- Shake, wiggle, and bend the LFC circuit(s).
- Lightly tap on the LFC RLY to simulate road shock
Is a concern present?

Yes	No
ISOLATE the concern and REPAIR as necessary.	Unable to duplicate or identify the concern at this time. refer to PINPOINT TEST Z .

KF19 CONTINUOUS MEMORY DTC P0481: CHECK THE HFC CIRCUIT FOR AN INTERMITTENT OPEN OR SHORT TO VOLTAGE

A/C and defrost off.
Left Fan Motor connector disconnected.
Right Fan Motor connector disconnected.

Connect a non-powered test lamp between:

( + ) Right Fan Motor Connector, Harness Side	( - ) Right Fan Motor Connector, Harness Side
HSFAN PWR - Pin 1	GND - Pin 3

Key ON, engine OFF.
Enter output test mode. Refer toOUTPUT TEST MODE (OTM) .
Command the high speed fan ON.
Observe the test lamp for an indication of a concern while completing the following. Note that the lamp turns on when a concern is detected.
- Shake, wiggle, and bend the HFC circuit(s).
- Shake, wiggle, and bend the VPWR circuit to the HFC relay.
- Lightly tap on the high speed FC relay to simulate road shock
Is a concern present?

Yes	No
ISOLATE the concern and REPAIR as necessary.	GO to KF20.

KF20 CHECK THE HFC CIRCUIT FOR AN INTERMITTENT SHORT TO GROUND

Key ON, engine OFF.
Command the outputs OFF.
Observe the test lamp for an indication of a concern while completing the following. Note that the lamp turns on when a concern is detected.
Shake, wiggle, and bend the HFC circuit(s).
Is a concern present?

Yes	No
ISOLATE the concern and REPAIR as necessary.	Unable to duplicate or identify the concern at this time. refer to PINPOINT TEST Z .

KF21 CONTINUOUS MEMORY DTC P0482: CHECK THE MFC CIRCUIT FOR AN INTERMITTENT OPEN OR SHORT TO VOLTAGE

A/C and defrost off.
Left Fan Motor connector disconnected.
Right Fan Motor connector disconnected.

Connect a non-powered test lamp between:

( + ) Right Fan Motor Connector, Harness Side	( - ) Right Fan Motor Connector, Harness Side
MSFAN PWR - Pin 2	GND - Pin 3

Key ON, engine OFF.
Enter output test mode. Refer toOUTPUT TEST MODE (OTM) .
Command the low speed fan ON.
Observe the test lamp for an indication of a concern while carrying out the following. Note that the lamp turns off when a concern is detected.
- Shake, wiggle, and bend the MFC circuit(s).
- Shake, wiggle, and bend the VPWR circuit to the MFC relay.
- Medium speed FC relay low speed FC relay
Is a concern present?

Yes	No
ISOLATE the concern and REPAIR as necessary.	GO to KF22.

KF22 CHECK THE MFC CIRCUIT FOR AN INTERMITTENT SHORT TO GROUND

Key ON, engine OFF.
Command the outputs OFF.
Observe the test lamp for an indication of a concern while completing the following. Note that the lamp turns off when a concern is detected.
Shake, wiggle, and bend the MFC circuit(s).
Is a concern present?

Yes	No
ISOLATE the concern and REPAIR as necessary.	Unable to duplicate or identify the concern at this time. refer to PINPOINT TEST Z .

KF23 COOLING FAN ALWAYS RUNS (NO DTCS): VERIFY THE FAN IS NOT ON BECAUSE OF A/C HIGH PRESSURE SWITCH INPUT TO THE PCM

Key ON, engine running.
Access the PCM and monitor the ACP PID.
Is the PID state CLOSED?

Yes	No
The PCM will turn the fan on when the medium pressure, normally open contacts of the ACHP switch are closed. GO to KF24.	Input OK. GO to KF26.

KF24 CHECK THE A/C HIGH PRESSURE SWITCH (A/CHPSW) (MEDIUM PRESSURE, NORMALLY OPEN CONTACTS)

A/CHPSW connector disconnected.
Key ON, engine OFF.
Access the PCM and monitor the ACP PID.
Is the PID state CLOSED?

Yes	No
GO to KF25.	RECONNECT A/CHPSW. REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS - HYBRID to diagnose the A/C system. If OK, INSTALL a new A/CHPSW. CLEAR the DTCs. REPEAT the self-test.

KF25 CHECK THE A/CPSW CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS

Key in OFF position.
PCM connector disconnected.

Measure the resistance between:

( + ) A/CHPSW Connector, Harness Side	( - )
A/CPSW	Ground

Is the resistance greater than 10K ohms?

Yes	No
VERIFY the results of the previous test steps. RETURN to the SYMPTOM CHARTS article to continue diagnosis. If OK, INSTALL a new PCM. REFER toFLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .	REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

KF26 CHECK THE VPWR VOLTAGE TO LOW SPEED FC RELAY

LFC Relay connector disconnected.
Key ON, engine OFF.

Measure the voltage between:

( + ) LFC Relay Connector, Harness Side	( - ) Vehicle Battery
VPWR - Pin 2	Negative terminal

Is the voltage greater than 10.5 V?

Yes	No
GO to KF27.	REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

KF27 CHECK FOR LFC CIRCUIT CYCLING

NOTE: During KOEO on demand self-test, the LFC circuit will be cycled on and off.

Connect a non-powered test lamp between:

( + ) LFC Relay Connector, Harness Side	( - ) LFC Relay Connector, Harness Side
VPWR - Pin 2	LFC - Pin 1

Carry out the PCM KOEO on demand self-test.
Does the test lamp illuminate on and off during the KOEO on demand self-test?

Yes	No
GO to KF28.	REMOVE the test lamp. GO to KF4.

KF28 CHECK THE VPWR VOLTAGE TO MEDIUM SPEED FC RELAY

Key in OFF position.
MFC Relay connector disconnected.
Key ON, engine OFF.

Measure the voltage between:

( + ) MFC Relay Connector, Harness Side	( - )
VPWR - Pin 2	Ground

Is the voltage greater than 10.5 V?

Yes	No
GO to KF29.	REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

KF29 CHECK FOR MFC CIRCUIT CYCLING

NOTE: During KOEO on demand self-test, the MFC circuit will be cycled on and off.

Connect a non-powered test lamp between:

( + ) MFC Relay Connector, Harness Side	( - ) MFC Relay Connector, Harness Side
VPWR - Pin 2	MFC - Pin 1

Carry out the PCM KOEO on demand self-test.
Does the test lamp illuminate on and off during the KOEO on demand self-test?

Yes	No
GO to KF30.	REMOVE the test lamp. GO to KF9.

KF30 CHECK THE VPWR VOLTAGE TO HIGH SPEED FC RELAY

Key in OFF position.
HFC Relay connector disconnected.
Key ON, engine OFF.

Measure the voltage between:

( + ) HFC Relay Connector, Harness Side	( - )
VPWR - Pin 2	Ground

Is the voltage greater than 10.5 V?

Yes	No
GO to KF31.	REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

KF31 CHECK FOR HFC CIRCUIT CYCLING

NOTE: During KOEO on demand self-test, the HFC circuit will be cycled on and off.

Connect a non-powered test lamp between:

( + ) HFC Relay Connector, Harness Side	( - ) HFC Relay Connector, Harness Side
VPWR - Pin 2	HFC - Pin 1

Carry out the KOEO on demand self-test.
Does the test lamp illuminate on and off during the KOEO on demand self-test?

Yes	No
The PCM primary FC circuits are OK. REFER to the Wiring Diagram, Cell 149 Component Testing to check the relay(s). INSTALL a new FC relay if necessary. To check the secondary FC circuits, REFER to ENGINE COOLING - HYBRID .	REMOVE the test lamp. GO to KF14.