Operation CHARM: Car repair manuals for everyone.
Home >> Ford >> 1994 >> Thunderbird V8-281 4.6L SOHC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Pinpoint Tests >> X - Constant Control Relay Module (CCRM) >> X15 - Check High Fan Control (HFC) Relay Resistance
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

X15 - Check High Fan Control (HFC) Relay Resistance



Diagnostic Trouble Code (DTC) 1479 indicates a High Fan Control (HFC) primary circuit failure.

NOTE: For one speed fan applications, disregard DTC 1479.

Possible causes are:
- Open or shorted circuit.
- Damaged CCRM.
- Damaged PCM.

- Key Off.

- Disconnect CCRM.

- Measure resistance between Pin 17 and Pin 24 at the CCRM.

- Is the resistance between 50 and 100 ohms?

YES -- GO to X16. X16 - Check HFC Circuit Continuity

NO -- REPLACE CCRM. Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes
pro multis · About Operation CHARM