Page 3752 of 5267
P1756-GOV PRESS NOT EQUAL TO TARGET @ 35 - 40 PSI (DIESEL)
For a complete wiring diagramRefer to Section 8W
Page 3759 of 5267
P1757-GOV PRESS ABOVE 3 PSI IN GEAR WITH 0 MPH (DIESEL)
For a complete wiring diagramRefer to Section 8W
Page 3765 of 5267
P1762-GOV PRESS SENSOR OFFSET VOLTS TOO LOW OR HIGH (DIESEL)
For a complete wiring diagramRefer to Section 8W
Page 3770 of 5267
P2769-TRANSMISSION TCC CONTROL CIRCUIT LOW
For a complete wiring diagramRefer to Section 8W
Page 3777 of 5267
P2770-TRANSMISSION TCC CONTROL CIRCUIT HIGH (DIESEL)
For a complete wiring diagramRefer to Section 8W
Page 3782 of 5267
*TOW /HAUL OVERDRIVE OFF SWITCH (DIESEL)
For a complete wiring diagramRefer to Section 8W
Page 3786 of 5267

PRE-DIAGNOSTIC CHECKOUT (DIESEL)
For a complete wiring diagramRefer to Section 8W
1.PRE-DIAGNOSTIC CHECKOUT
NOTE: Always perform diagnostics with a fully charged battery to avoid false symptoms.
NOTE: Low fluid level can be the cause of many transmission problems. If thefluid level is low locate and
repair the leak then check and adjust the fluid level per the Service Information.
With the scan tool, read engine DTC’s. Check and repair all engine DTCs prior to performing transmission symptom
diagnostics.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Repair as necessary.
Verify the flash level of the Engine Control Module. Some problems are corrected by software upgrades.
Check for any Service Information Tune-ups or Technical Service Bulletins that may apply.
Did any of the above checks or procedures correct the symptom?
Ye s>>
Repair is complete.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 48RE - STANDARD PROCEDURE)
No>>
Refer to the Transmission category and perform the appropriate symptom(s).
Page 3787 of 5267

page page
AUTOMATIC TRANSMISSION - 48RE - SERVICE
INFORMATION
DESCRIPTION ............................. 1268
OPERATION ............................... 1271
DIAGNOSIS AND TESTING
AUTOMATIC TRANSMISSION .............. 1277
PRELIMINARY ............................ 1277
ROAD TESTING .......................... 1277
HYDRAULIC PRESSURE TEST . ........... 1278
AIR TESTING TRANSMISSION CLUTCH
AND BAND OPERATION................... 1281
CONVERTER HOUSING FLUID LEAK ...... 1282
DIAGNOSIS CHARTS ..................... 1283
STANDARD PROCEDURE - ALUMINUM
THREAD REPAIR ......................... 1293
REMOVAL ................................. 1294
DISASSEMBLY ............................. 1298
CLEANING ................................. 1306
INSPECTION ............................... 1306
ASSEMBLY . ............................... 1307
INSTALLATION ............................. 1317
SCHEMATICS AND DIAGRAMS
HYDRAULIC SCHEMATICS ................ 1322
SPECIFICATIONS
TRANSMISSION .......................... 1336
SPECIAL TOOLS
RE TRANSMISSION ...................... 1339
ACCUMULATOR
DESCRIPTION ............................. 1341
OPERATION ............................... 1342
INSPECTION ............................... 1342
BANDS
DESCRIPTION ............................. 1343
OPERATION ............................... 1343
ADJUSTMENTS
ADJUSTMENT - BANDS ................... 1344
SYSTEM-BRAKE TRANSMISSION SHIFT
INTERLOCK
DESCRIPTION ............................. 1345
OPERATION ............................... 1345
DIAGNOSIS AND TESTING - BRAKE
TRANSMISSION SHIFT INTERLOCK ........ 1345
ADJUSTMENTS - BRAKE TRANSMISSION
SHIFT INTERLOCK ....................... 1345
GOVERNOR-ELECTRONIC
DESCRIPTION ............................. 1347
OPERATION ............................... 1348
REMOVAL ................................. 1349
INSTALLATION ............................. 1350SEAL-EXTENSION HOUSING
REMOVAL ................................. 1352
INSTALLATION ............................. 1352
FLUID AND FILTER
DIAGNOSIS AND TESTING
EFFECTS OF INCORRECT FLUID LEVEL . . . 1353
CAUSES OF BURNT FLUID ............... 1353
FLUID CONTAMINATION .................. 1353
STANDARD PROCEDURE
FLUID LEVEL CHECK ..................... 1353
FLUID AND FILTER REPLACEMENT ....... 1355
TRANSMISSION FILL ..................... 1357
CLUTCH-FRONT
DESCRIPTION ............................. 1358
OPERATION ............................... 1358
DISASSEMBLY . ............................ 1359
INSPECTION............................... 1360
ASSEMBLY................................ 1360
SERVO-FRONT
DESCRIPTION ............................. 1363
OPERATION ............................... 1363
DISASSEMBLY . ............................ 1364
CLEANING ................................. 1364
INSPECTION ............................... 1365
ASSEMBLY................................ 1365
CABLE-GEARSHIFT
DIAGNOSIS AND TESTING - GEARSHIFT
CABLE ................................... 1366
REMOVAL ................................. 1366
INSTALLATION ............................. 1367
ADJUSTMENTS - GEARSHIFT CABLE ........ 1368
PUMP-OIL
DESCRIPTION ............................. 1369
OPERATION ............................... 1369
DISASSEMBLY ............................. 1370
CLEANING ................................. 1371
INSPECTION ............................... 1371
ASSEMBLY................................ 1373
BEARING-OUTPUT SHAFT FRONT
REMOVAL ................................. 1375
INSTALLATION ............................. 1375
BEARING-OUTPUT SHAFT REAR
REMOVAL ................................. 1376
INSTALLATION ............................. 1376
CLUTCH-OVERDRIVE
DESCRIPTION ............................. 1377
OPERATION ............................... 1377
UNIT-OVERDRIVE
REMOVAL ................................. 1378
DISASSEMBLY ............................. 1379