April 5, 2026: LEMON Manuals is launched! Read the announcement.

Converter Lock-Up Signal From ECM

Warm engine to operating temperature. Raise vehicle and support drive wheels. Support suspension where necessary to prevent damage to drive axles.
Connect a test light to battery voltage. Touch TCC control driver terminal with test light. See Fig 1-86. Accelerate vehicle to 45 MPH and note test light. If test light does not illuminate, problem is a faulty ECM connector or ECM. On some models, lock-up signal may be checked at ALDL terminal "F" instead of at ECM terminal.

Fig 1: Carbureted Converter Clutch Schematic

G90C13179

Courtesy of GENERAL MOTORS CORP.

Fig 2: 2.0L PFI Sunbird Converter Clutch Schematic

G90F13180

Courtesy of GENERAL MOTORS CORP.

Fig 3: 2.0L TBI, 2.2L & 2.5L Celebrity, Century, Cutlass Calais, Cutlass Cruiser, Grand Am & Skylark Converter Clutch

G90I13183

Courtesy of GENERAL MOTORS CORP.

Fig 4: 2.2L Beretta & Corsica Converter Clutch Schematic

G90G13181

Courtesy of GENERAL MOTORS CORP.

Fig 5: 2.3L Cutlass Calais, Cutlass Supreme, Grand Am, Grand Prix & Skylark Converter Clutch Schematic

G90H13182

Courtesy of GENERAL MOTORS CORP.

Fig 6: 2.5L Lumina Converter Clutch Schematic

G90J13184

Courtesy of GENERAL MOTORS CORP.

Fig 7: 3.1L Beretta & Corsica Converter Clutch Schematic

G90A13185

Courtesy of GENERAL MOTORS CORP.

Fig 8: 3.1L Camaro & Firebird Converter Clutch Schematic

G90B13186

Courtesy of GENERAL MOTORS CORP.

Fig 9: 3.1L Cavalier Converter Clutch Schematic

G90C13187

Courtesy of GENERAL MOTORS CORP.

Fig 10: 3.1L Celebrity & 6000 With 3T40 Transmission Converter Clutch Schematic

G90D13188

Courtesy of GENERAL MOTORS CORP.

Fig 11: 3.1L Celebrity & 6000 With 4T60 Transmission Converter Clutch Schematic

G90E13189

Courtesy of GENERAL MOTORS CORP.

Fig 12: 3.1L Lumina With 125C Transmission Converter Clutch Schematic

G90H13190

Courtesy of GENERAL MOTORS CORP.

Fig 13: 3.1L Cutlass Supreme, Grand Prix, Regal & Lumina With 4T60 Transmission Converter Clutch Schematic

G90I13191

Courtesy of GENERAL MOTORS CORP.

Fig 14: 3.3L Century & Skylark With 3T40 Transmission Converter Clutch Schematic

G90J13192

Courtesy of GENERAL MOTORS CORP.

Fig 15: 3.3L Century With 4T60 Transmission Converter Clutch Schematic

G90A13193

Courtesy of GENERAL MOTORS CORP.

Fig 16: 3.8L Bonneville, Delta 88 & Ninety-Eight Converter Clutch Schematic

G90B13194

Courtesy of GENERAL MOTORS CORP.

Fig 17: 3.8L Reatta & Riviera Converter Clutch Schematic

G90C13195

Courtesy of GENERAL MOTORS CORP.

Fig 18: 3.8L Toronado & Trofeo Converter Clutch Schematic

G90D13196

Courtesy of GENERAL MOTORS CORP.

Fig 19: 4.5L DeVille, Eldorado, Fleetwood & Seville Converter Clutch Schematic

G90E13197

Courtesy of GENERAL MOTORS CORP.

Fig 20: 5.0L TBI Camaro & Firebird Converter Clutch Schematic

G90F13198

Courtesy of GENERAL MOTORS CORP.

Fig 21: 5.0L & 5.7L TBI Caprice & Custom Cruiser Converter Clutch Schematic

G90G13199

Courtesy of GENERAL MOTORS CORP.

Fig 22: 5.0L & 5.7L PFI Camaro & Firebird Converter Clutch Schematic

G90J13200

Courtesy of GENERAL MOTORS CORP.

Fig 23: 5.7L Brougham Converter Clutch Schematic

G90A13201

Courtesy of GENERAL MOTORS CORP.

Fig 24: 5.7L Corvette Converter Clutch Schematic

G90B13202

Courtesy of GENERAL MOTORS CORP.