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Engine Controls - Pin Voltage Charts Buick LeSabre VII

Pin Voltage Charts 6 illustrations ~242 words

INTRODUCTION

Pin voltage charts are supplied (where available) to reduce diagnostic time. Checking pin voltages at the Powertrain Control Module (PCM) determines whether the PCM is receiving and transmitting proper voltage signals. Charts may also help determine if PCM harness has shorts or opens.

Note. Unless stated otherwise in testing procedures, all voltage tests should be performed with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance.

3.8L VINS K & 1 (BONNEVILLE & EIGHTY-EIGHT)

Note. This PCM voltage chart can be used with a digital voltmeter to save time in diagnosis. Voltages on vehicle being tested may vary slightly from these due to battery voltage or alternator charging level.

Following conditions must be met before testing

  1. Engine at operating temperature.
  2. Engine in closed loop operation.
  3. Engine idling (ENG. "RUN" column).
  4. DLC "test" terminal not grounded.
  5. Scan tester not installed.
  6. Brake not applied.
  7. B+ indicates battery voltage.

Scheme 1

Scheme 1
Scheme 1

Scheme 2

Scheme 2
Scheme 2

Scheme 3

Scheme 3
Scheme 3

Scheme 4

Scheme 4
Scheme 4

Scheme 5

Scheme 5
Scheme 5

Scheme 6

Scheme 6
Scheme 6

3.8L VIN L (LESABRE)

Note. This PCM voltage chart can be used with a digital voltmeter to save time in diagnosis. Voltages on vehicle being tested may vary slightly from these due to battery voltage or alternator charging level.

Following conditions must be met before testing

  1. Engine at operating temperature.
  2. Engine in closed loop operation.
  3. Engine idling (ENG. "RUN" column).
  4. DLC "test" terminal not grounded.
  5. Scan tester not installed.
  6. Brake not applied.
  7. B+ indicates battery voltage.