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Contents Section: Tests W/codes - 3.0l VIN (l) & 3.8l VIN (3 & 7) All sections

CODE 55 ECM ERROR Buick LeSabre VI

Tests W/codes - 3.0l VIN (l) & 3.8l VIN (3 & 7) 9 illustrations ~361 words

CODE 55 ECM ERROR

Note. Replace electronic control module (ECM)

Clear all codes and confirm "CLOSED LOOP" operation and no "SERVICE ENGINE SOON" light.

PFI (ECM) Terminal ID (3.0L "N" Body). Scheme 235

Scheme 235: PFI (ECM) Terminal ID (3.0L "N" Body)
Scheme 235: PFI (ECM) Terminal ID (3.0L "N" Body)

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

The following conditions must be met before testing

  1. Engine at operating temperature.
  2. Engine in closed loop operation.
  3. Engine idling ("Engine Run" column).
  4. Test terminal NOT grounded.
  5. Scanner or ALDL tool NOT installed.

PFI ECM Terminal ID (3.8L "A", "C" & "H" Bodies). Scheme 236

Scheme 236: PFI ECM Terminal ID (3.8L "A", "C" & "H" Bodies)
Scheme 236: PFI ECM Terminal ID (3.8L "A", "C" & "H" Bodies)

Note. This ECM voltage chart can be used with a digital voltmeter to help save time in diagnosis. Voltages on the car being tested my vary slightly from these due to battery or alternator charging level.

The following conditions must be met before testing

  1. Engine at operating temperature.
  2. Engine in closed loop operation.
  3. Engine idling ("Engine Run" column).
  4. Test terminal NOT grounded.
  5. Scanner or ALDL tool NOT installed.

PFI ECM Terminal ID (3.8L Turbo "G" Body). Scheme 237

Scheme 237: PFI ECM Terminal ID (3.8L Turbo "G" Body)
Scheme 237: PFI ECM Terminal ID (3.8L Turbo "G" Body)

Note. This ECM voltage chart can be used with a digital voltmeter to help save time in diagnosis. Voltages on the car being tested my vary slightly from these due to battery or alternator charging level.

The following conditions must be met before testing

  1. Engine at operating temperature.
  2. Engine in closed loop operation.
  3. Engine idling ("Engine Run" column).
  4. Test terminal NOT grounded.
  5. Scanner or ALDL tool NOT installed.

Component Location (3.0L "N" Body & 3.8L Turbo "G" Body). Scheme 238

Scheme 238: Component Location (3.0L "N" Body & 3.8L Turbo "G" Body)
Scheme 238: Component Location (3.0L "N" Body & 3.8L Turbo "G" Body)

Component Location (3.8L Non-Turbo "A", "C" & "H" Bodies). Scheme 239

Scheme 239: Component Location (3.8L Non-Turbo "A", "C" & "H" Bodies)
Scheme 239: Component Location (3.8L Non-Turbo "A", "C" & "H" Bodies)

Port Fuel Injection Wiring Diagram (3.0L "N" Body). Scheme 240

Scheme 240: Port Fuel Injection Wiring Diagram (3.0L "N" Body)
Scheme 240: Port Fuel Injection Wiring Diagram (3.0L "N" Body)

Port Fuel Injection Wiring Diagram (3.8L "A" Body). Scheme 241

Scheme 241: Port Fuel Injection Wiring Diagram (3.8L "A" Body)
Scheme 241: Port Fuel Injection Wiring Diagram (3.8L "A" Body)

Port Fuel Injection Wiring Diagram (3.8L "C" & "H" Bodies). Scheme 242

Scheme 242: Port Fuel Injection Wiring Diagram (3.8L "C" & "H" Bodies)
Scheme 242: Port Fuel Injection Wiring Diagram (3.8L "C" & "H" Bodies)

Port Fuel Injection Wiring Diagram (3.8L Turbo "G" Body). Scheme 243

Scheme 243: Port Fuel Injection Wiring Diagram (3.8L Turbo "G" Body)
Scheme 243: Port Fuel Injection Wiring Diagram (3.8L Turbo "G" Body)

See also:
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• 24
• 31
• 32
• 33
• 34
• 42
• 43
• 44
• 45
• 51
• 52
• 55