1968 Shelby GT500

Three-Digit Codes 224-525

#

When

3-Digit Code Definitions

KOEO

CM

KOER

224

 

X

 

Erratic IDM input to processor

225

 

 

X

Knock Sensor (KS) signal not sensed during dynamic response test.

226

X

 

 

IDM signal not received

244

 

 

X

Camshaft Position (CMP) Sensor failure.

311

 

 

X

Thermactor air system inoperative  (right side)

312

 

 

X

Thermactor air misdirected upstream during self test.

313

 

 

X

Thermactor air not bypassed during self test.

314

 

 

X

Thermactor air system inoperative  (left side)

326

 

X

X

PFE or DPFE circuit voltage lower than expected with zero EVR duty cycle.

327

X

X

X

DPFE or EVP circuit below minimum voltage of 0.2 volts.

328

X

X

X

EVP circuit below minimum voltage of 0.24 volts.

332

 

X

X

EGR valve opening not detected.

334

X

X

X

DPFE or EVP circuit above the closed limit of 0.67 volts.

335

X

 

 

PFE or DPFE sensor voltage out of Self-Test range.

336

 

X

X

EVP or DPFE circuit voltage above maximum voltage with zero EVR duty cycle.

337

X

X

X

DPFE or EVP circuit above the maximum limit of 4.81 volts.

338

 

X

 

ECT lower than expected.

339

 

X

 

ECT higher than expected.

341

X

 

 

Octane Adjust shorting bar is not in or the OCT ADJ circuit is open.

381

 

X

 

Frequent A/C compressor clutch (ACCS) cycling less than 8.5 seconds.

411

 

 

X

Cannot control rpm during KOER low RPM check

412

 

 

X

Cannot control rpm during KOER high RPM check

452

 

X

 

Computer detected an error in the VSS or PSOM signal during the last 80 warm-up cycles.

461

 

X

 

Engine over speed was detected

511

X

X

X

EEC permanent Read Only Memory (ROM) test failed.

512

 

X

 

EEC battery powered Keep Alive Memory (KAM) test failed.

513

 

X

 

Failure in EEC processor internal voltage.

519

X

 

 

Power steering pressure switch circuit open.

521

 

 

X

Power steering pressure switch did not change state during KOER test.

522

X

 

 

Vehicle not in PARK or NEUTRAL during KOEO

524

X

X

 

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

525

X

X

 

Vehicle in gear or A/C on during Self-Test

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

Codes 111-171
Codes 172-223
Codes 526-586
Codes 587-656
Codes 657-999
Two Digit Codes

 
 
 
 
 

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