Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCADILLAC1993DEVILLE BASE, 4D SEDANREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - PCM/BCMDIAGNOSTIC TESTINGPCM DATA PARAMETERSENTERING PCM DATA PARAMETERS DISPLAY

1993 Cadillac DeVille Base, 4D Sedan

Entering PCM Data Parameters Display

1993 Cadillac DeVille Base, 4D SedanSECTION Entering PCM Data Parameters Display

With ".7.0" displayed on FDC (to cause ".7.0" to be displayed on FDC, see INTRODUCTION TO DIAGNOSTIC TESTING), depress and release LO button on ECC panel. This will switch display from ".7.0" to "E.9.0", signaling start of PCM data parameters display. Data parameter displays are prefixed by "P".
To advance system to a higher numbered data parameters display, depress HI button on ECC panel. To return to a lower numbered data parameters display, depress LO button on ECC panel. For complete list of data parameter displays, see PCM DATA PARAMETERS table.

PCM DATA PARAMETERS

Display

Parameter

Range

P.0.1

TP Sensor Opening

-10° To 90°

P.0.2

MAP

14-109 kPa

P.0.3

BARO

⁽¹⁾ 60-102 kPa

P.0.4

CTS

-40° To 151°C

P.0.5

MAT

-40° To 151°C

P.0.6

Spark Advance

0-90 Degrees

P.0.7

Battery Voltage

0-25 Volts

P.0.8

Engine Speed

0-6370 RPM

P.0.9

Vehicle Speed

0-255 MPH

P.1.2

Injector Pulse Width

0-99.6 ms

P.1.4

O2 Sensor Voltage

0-.99 Volt

P.1.6

O2 Sensor Cross Counts

⁽²⁾ 0-255

P.1.8

Integrator

⁽³⁾ 0-255

P.2.0

Block Learn

⁽⁴⁾ 0-255

P.2.1

Cruise Servo Position

⁽⁵⁾ 0-100%

P.2.2

PRNDL Switch Status

⁽⁶⁾ 0 Or 1

P.2.3

PRNDL Switch Status

⁽⁶⁾ 0 Or 1

P.2.4

Ignition Cycles

1-50

P.2.5

PROM ID Code

⁽⁷⁾

⁽¹⁾	BARO reading is taken with ignition on and is corrected at wide open throttle.

⁽²⁾	Measured in cross counts, which are registered when voltage crosses reference voltage of .45 volt.

⁽³⁾

Normal count position for integrator is "128", indicating engine is operating normally. A count greater than 128 indicates time is being added to injector pulse width, adding fuel to engine. A count less than 128 indicates time is being subtracted from injector pulse width, reducing amount of fuel to engine.

⁽⁴⁾	Normal count position is "128", indicating engine is operating normally. Block learn value is based on integrator learned values. Readings greater than 128 indicate time is being added to injector pulse width. Readings less than 128 indicate time is being subtracted from injector pulse width.

⁽⁵⁾	"0" equals full extend and "99" equals full retract.

⁽⁶⁾	"0" indicates switch is closed and "1" indicates switch is open.

⁽⁷⁾	Display shows a 3-digit code identifying PROM.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.