1968 Shelby GT500

Three-Digit Codes 526-586

#

When

3-Digit Code Definitions

KOEO

CM

KOER

526

X

 

 

Neutral Pressure Switch closed or A/C on

527

X

 

 

Neutral Drive Switch open or A/C on

528

 

X

 

Clutch Switch Circuit failure

529

 

X

 

Data Communications Link or Electronic Instrument Cluster circuit failure.

532

 

X

 

Data Communications Link or Electronic Instrument Cluster circuit failure.

533

 

X

 

Data Communications Link or Electronic Instrument Cluster circuit failure.

536

 

X

X

Brake On/Off circuit failure / switch not actuated during KOER test

538

 

 

X

Insufficient RPM change during KOER dynamic response test/ Operator error

539

X

 

 

A/C or Defroster ON during KOEO test

542

X

X

 

Fuel pump circuit failure

543

X

X

 

When the PCM commanded the fuel pump on, voltage was not detected on FPM.

551

X

 

 

Intake Manifold Runner Control (IMRC) circuit failure

552

X

 

 

Air management 1 circuit failure (AM1/TAB)

553

X

 

 

Air management 2 circuit failure (AM1/TAD)

554

X

 

 

Fuel Pressure Regulator Control (FPRC) solenoid circuit failure

556

X

X

 

Fuel Pump circuit failure

557

X

X

 

Fuel pump relay coil resistance failure

558

X

 

 

EGR Vacuum Regulator circuit failure

559

X

 

 

Air Conditioning On relay circuit failure

563

X

 

 

High Speed Electro-Drive Fan circuit failure

564

X

 

 

Electro-Drive Fan circuit failure

565

X

 

 

Canister purge circuit failure

566

X

 

 

3 4 Shift Solenoid failure

569

X

 

 

Canister purge 2 circuit failure

571

X

 

 

EGR Atmospheric Regulator circuit failure.

572

X

 

 

EGR Vacuum Regulator circuit failure.

578

 

X

 

A/C Pressure (ACP) sensor VREF circuit is short to ground.

579

 

X

 

A/C Pressure (ACP) sensor circuit is above maximum voltage.

581

 

X

 

When the cooling fan was activated, the circuit exceeded current draw.

582

X

 

 

Open or short to power in the power-to-cooling fan circuit.

583

 

X

 

When the fuel pump was activated, the power-to-pump circuit exceeded the normal current draw.

584

 

X

 

Variable Control Relay Module circuit grounded.

585

 

X

 

A/C clutch circuit exceeded the normal current draw.

586

 

X

 

A/C clutch circuit open or shorted to power

KOEO = Key On Engine Off, CM = Continues Memory, KOER = Key On Engine Running

Codes 111-171
Codes 172-223
Codes 224-525
Codes 587-656
Codes 657-999
Two Digit Codes

 
 
 
 
 
 

© 2002-2012 UNIVEX Automotive Institute.
FuelInjectedFord.com, is not affiliated with Ford Motor Company."