TSB 53-50-01 (S: EXPERTEC TSB (53-50-01A)

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Publication date: 1995-03-01 Reference number: 53-50-01A EXPERTEC TSB EXPERTEC TSB TECHNICAL SERVICE BULLETIN Reference Number(s): 53-50-01A, Date of Issue:  03/01/95 INFO. ON SERVICEABILITY OF - ABS AND ABS/TCS Model(s): 1991-95 Buick LeSabre, Park Avenue 1995 Buick Riviera 1991-93 Cadillac DeVille, Fleetwood, Sixty Special 1991-95 Oldsmobile Eighty Eight, Ninety Eight 1995 Oldsmobile Aurora 1991-95 Pontiac Bonneville Bulletun No.: Cadillac 53-50-01A Date: 03/01/1995 BULLETIN ILLUSTRATION LIST Fig 1: Graphic Fig 2: Graphic SERVICE INFORMATION Subject: Serviceability of ABS and ABS/TCS Pressure Modulator Valve (PMV) Assembly This bulletin is being revised to clarify parts information. Artwork remains the same. Please discard Corporate Bulletin Number 53-50-01 (Section 5 - Brakes). This bulletin is to provide information on the serviceability of the Pressure Modulator Valve (PMV) Assembly Sections 5E1 (ABS) and 5E2 (ABS/TCS and ABS) of the appropriate Service Manual should also be updated accordingly. As of February 9, 1995, parts will be available through GMSPO that will allow serviceability of the Pressure Modulator Valve (PMV) Assembly. Currently the unit is replaced as a whole assembly. This bulletin is to inform that the PMV will be split into 2 units: 1) the Valve Body, and 2) the Pump and Motor Assembly, which can then be individually replaced. SERVICE INFORMATION Procedure For Disassembling The PMV Assembly [Refer to Fig 1 ; (ABS only shown, ABS/TCS similar)) NOTE: The Pressure Modulator Valve (PMV) assembly must be removed before replacing the valve block. A clean work area is needed to prevent contamination of the PMV assembly and its internal components. REMOVE OR DISCONNECT PMV assembly, refer to "PMV Assembly" in Section 5E of the Service Manual. Valve block-to-pump attachment bolts (3). Valve block from pump and motor assembly. INSTALL OR CONNECT Metal gasket. NOTE: Install new metal gasket only as shown. Failure to install the metal gasket correctly will result in brake fluid loss and/or poor brake performance. Valve block to pump and motor assembly. Attach bolts (3). Tighten Tighten bolts to 29 N-m (21 lb ft). PMV assembly, refer to "PMV Assembly" in Section 5E of the Service Manual. The following attchments (PMV Serviceability - Buick, Cadillac, Oldsmobile, and Pontiac) list by division and year all of the tests, charts or DTC's which currently state to replace the PMV Assembly. After the title of each test, chart, or DTC is the name of the faulted unit which is to be replaced as a result of this bulletin. For example, in Test B: PMV Continuity Test of the 1991 Buick C/H, all areas where it states to replace the PMV Assembly should now state "replace the valve block only". Fig 3: PARTS INFORMATION TABLE Parts are currently available from GMSPO. WARRANTY INFORMATION For vehicles repaired under warranty, use: Fig 4: WARRANTY INFORMTION TABLE PMV SERVICEABILITY - BUICK 91 BUICK C/H TEST B: PMV CONTINUITY TEST - VALVE BLOCK TEST F: PUMP MOTOR CIRCUIT TEST - PUMP AND MOTOR ASSY. TEST O: INLET/OUTLET VALVE HYDRAULIC TEST - VALVE BLOCK 92 BUICK C/H TEST D: PMV CONTINUITY TEST - VALVE BLOCK TEST J: PUMP MOTOR CIRCUIT TEST - PUMP AND MOTOR ASSY. TEST L: BRAKE HYDRAULIC TEST - PUMP AND MOTOR ASSY. TEST P: EBCM OPEN SWITCH INPUT TEST - VALVE BLOCK TEST W: INLET/OUTLET VALVE HYDRAULIC TEST - VALVE BLOCK TEST Y: ISOLATION VALVE CIRCUIT TEST - VALVE BLOCK 93 BUICK C/H TEST D: PMV CONTINUITY TEST - VALVE BLOCK TEST J: PUMP MOTOR CIRCUIT TEST - PUMP AND MOTOR ASSY. TEST M: BRAKE HYDRAULIC TEST - PUMP AND MOTOR ASSY. TEST P: EBCM/EBTCM OPEN SWITCH INPUT TEST - VALVE BLOCK TEST Z: ISOLATION VALVE CONTINUITY TEST - VALVE BLOCK TEST BB: INLET/OUTLET VALVE HYDRAULIC TEST - VALVE BLOCK 94 BUICK C/H TEST D: PMV CONTINUITY TEST - VALVE BLOCK TEST J: PUMP MOTOR CIRCUIT TEST - PUMP AND MOTOR ASSY. TEST L: BRAKE HYDRAULIC TEST - PUMP AND MOTOR ASSY. TEST P: EBCM OPEN SWITCH INPUT TEST - VALVE BLOCK TEST X: ISOLATION VALVE CONTINUITY TEST- VALVE BLOCK TEST Z: INLET/OUTLET VALVE HYDRAULIC TEST - VALVE BLOCK 95 BUICK C/H and G DTC 41, 42, 46, 51, 52, 55, 56 INLET/OUTLET VALVE CIRCUIT OPEN OR SHORTED - VAVLE BLOCK DTC 44.48 ISOLATION VALVE CIRCUIT OPEN OR SHORTED - VALVE BLOCK DTC 45 POWER INTERRUPTION FAULT - VALVE BLOCK DTC 61 PUMP MOTOR CIRCUIT TEST - PUMP AND MOTOR ASSY. DTC 62 LOW BRAKE PEDAL DURING ABS STOP - PUMP AND MOTOR ASSY. DTC 74 PMV PRESSURE SWITCH CIRCUIT OPEN OR SHORTED -VALVE BLOCK PMV SERVICABILITY - CADILLAC 91 CADILLAC DEVILLE/FLEETWOOD CHART E: INLET/OUTLET VALVE CIRCUIT TEST - VALVE BLOCK CHART F: PUMP MOTOR CIRCUIT TEST - PUMP AND MOTOR ASSY. CHART I: PUMP MOTOR FAULT DURING ABS STOP - PUMP AND MOTOR ASSY. CHART L: INLET/OUTLET VALVE HYDRAULIC. TEST - VALVE BLOCK 92-93 CADILLAC DEVILLE/FLEETWOOD/SIXTY SPECIAL CHART E: INLET/OUTLET VALVE CIRCUIT TEST - VALVE BLOCK CHART F: PUMP MOTOR CIRCUIT TEST - PUMP AND MOTOR ASSY. CHART I: PUMP MOTOR FAULT DURING ABS STOP - PUMP AND MOTOR ASSY. CHART L: INLET/OUTLET VALVE HYDRAULIC. TEST - VALVE BLOCK CHART O: ISOLATION VALVE CIRCUIT FAILURE - VALVE BLOCK CHART P: PMV PRESSURE SWITCH CIRCUIT FAILURE - VALVE BLOCK PMV SERVICEABILITY- OLDSMOBILE 91 OLDS H CHART A: INLET/OUTLET VALVE CIRCUIT TEST - VALVE BLOCK CHART F: PUMP MOTOR CIRCUIT TEST - PUMP AND MOTOR ASSY. CHART I: PUMP MOTOR FAULT DURING ABS STOP - PUMP AND MOTOR ASSY. CHART L: INLET/OUTLET VALVE HYDRAULIC. TEST - VALVE BLOCK 91 OLDS C CHART A: INLET/OUTLET VALVE CIRCUIT TEST - VALVE BLOCK CHART F: PUMP MOTOR CIRCUIT TEST - PUMP AND MOTOR ASSY. CHART I: PUMP MOTOR FAULT DURING ABS STOP - PUMP AND MOTOR ASSY. CHART L: INLET/OUTLET VALVE HYDRAULIC. TEST - VALVE BLOCK CHART O: ISOLATION VALVE CIRCUIT FAULT - VALVE BLOCK CHART P: PRESSURE SWITCH CIRCUIT FAULT - VALVE BLOCK 92 and 93 OLDS C/H CHART E: INLET/OUTLET VALVE CIRCUIT TEST - VALVE BLOCK CHART F: PUMP MOTOR CIRCUIT TEST - PUMP AND MOTOR CHART I: PUMP MOTOR FAULT DURING ABS STOP - PUMP AND MOTOR ASSY. CHART L: INLET/OUTLET VALVE HYDRAULIC. TEST - VALVE BLOCK CHART O: ISOLATION VALVE CIRCUIT FAILURE - VALVE BLOCK CHART P: PMV PRESSURE SWITCH CIRCUIT FAILURE - VALVE BLOCK 94 OLDS C/H, 95 OLDS C/H and G DTC 41, 42, 46, 51, 52, 55, 56 INLET/OUTLET VALVE CIRCUIT OPEN OR SHORTED - VALVE BLOCK DTC 44,48 ISOLATION VALVE CIRCUIT OPEN OR SHORTED - VALVE BLOCK DTC 45 POWER INTERRUPTION FAULT - VALVE BLOCK DTC 61 PUMP MOTOR CIRCUIT TEST - PUMP AND MOTOR ASSY. DTC 62 LOW BRAKE PEDAL DURING ABS STOP - PUMP AND MOTOR ASSY. DTC 74 PMV PRESSURE SWITCH CIRCUIT OPEN OR SHORTED - VALVE BLOCK PMV SERVICEABILITY - PONTIAC 91 PONTIAC H CHART A: INLET/OUTLET VALVE CIRCUIT TEST - VALVE BLOCK CHART F: PUMP MOTOR CIRCUIT TEST - PUMP AND MOTOR ASSY. CHART I: PUMP MOTOR FAULT DURING ABS STOP - PUMP AND MOTOR ASSY. CHART L: INLET/OUTLET VALVE HYDRAULIC. TEST - VALVE BLOCK 92 and 93 PONTIAC H CHART E: INLET/OUTLET VALVE CIRCUIT TEST - VALVE BLOCK CHART F: PUMP MOTOR CIRCUIT TEST - PUMP AND MOTOR ASSY. CHART I: PUMP MOTOR FAULT DURING ABS STOP - PUMP AND MOTOR ASSY. CHART L: INLET/OUTLET VALVE HYDRAULIC. TEST - VALVE BLOCK CHART O: ISOLATION VALVE CIRCUIT FAILURE - VALVE BLOCK CHART P: PMV PRESSURE SWITCH CIRCUIT FAILURE - VALVE BLOCK 94 and 95 PONTIAC H DTC 41, 42, 46, 51, 52, 55, 56 INLET/OUTLET VALVE CIRCUIT OPEN OR SHORTED - VALVE BLOCK DTC 44,48 ISOLATION VALVE CIRCUIT OPEN OR SHORTED - VALVE BLOCK DTC 45 POWER INTERRUPTION FAULT - VALVE RLOCK DTC 61 PUMP MOTOR CIRCUIT TEST - PUMP AND MOTOR ASSY. DTC 62 LOW BRAKE PEDAL DURING ABS STOP - PUMP AND MOTOR ASSY. DTC 74 PMV PRESSURE SWITCH CIRCUIT OPEN OR SHORTED -VALVE BLOCK Labor Operations See Fig 2