Subject: | Service Manual Update for Automatic Transaxle Oil Pump Output Test and/or Line Pressure Test |
Models: | 1991 - 1997 Saturns equipped with MP6/MP7 automatic transaxles |
When diagnosing a condition and instructed to perform a pressure test according to the service manual, perform the procedure on the following two pages.
Important: The following two tests, located in the service manuals, should never be used when a pressure test is required.
• | "Oil Pump Output Test," located in the 1995, 1996 and/or 1997 "Automatic Transaxle Service Manual." |
• | "Pressure Test in Drive at Idle," located within the "Line Pressure Test," of the "1991-1994 Automatic Transaxle Service Manual." |
Instead of using either of these two tests located in the service manuals, refer to the following tests contained within this bulletin.
Important: For delay to reverse or harsh reverse engagement conditions, it is important to have at least 1206 kPa (175 psi) in Park at 70°C (158°F) to ensure proper pressure regulator and pump operation.
• | With gauge connected and trans at operating temperature. |
• | With engine idling in Park, line pressure should be 400-600 kPa (58-72 psi) |
• | Remove line pressure fuse (7.5 amp TRS LP) UHJB |
• | With engine idling in P (Park), pressure should be 1206-1690 kPa (175 -245 psi) |
Notice: High value may be slightly lower if transaxle temperature is greater than 110°C (230°F) |
Important: With engine in Park, and the 7.5 amp TRS LP line pressure fuse removed, minimum pressure should be 1206 kPa (175 psi). This is a change from previously published service manual. |
Tighten
Tighten nut to 8 N·m (71 in -lbs)
Command Line Pressure | Gauge Readings Should be in this range | ||
kPa | psi | kPa | psi |
396 | 57 | 400-500 | 58-72 |
498 | 72 | 425-550 | 61-80 |
600 | 87 | 500-675 | 72-98 |
702 | 102 | 600-800 | 87-116 |
804 | 117 | 700-925 | 101-134 |
906 | 131 | 800-1050 | 116-152 |
1000 | 146 | 900-1175 | 130-170 |
1110 | 161 | 1000-1300 | 145-188 |
1212 | 175 | 1100-1400 | 159-203 |
1314 | 191 | 1200-1500 | 174-218 |
1416 | 205 | 1300-1650 | 188-240 |
1518 | 220 | 1500-1850 | 218-268 |