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

Automatic Transmission Pinpoint Test 12: Shift Concerns: Timing Early / Late (Some / All): Notes

NOTE:

To diagnose specific shift-timing concerns, see the appropriate shift test.

Soft/Slipping Shift 1-2,

See AUTOMATIC TRANSMISSION PINPOINT TEST 22: SHIFT CONCERNS: SOFT / SLIPPING 1-2 ONLY (AUTOMATIC) , .

Soft/Slipping Shift 2-3,

See AUTOMATIC TRANSMISSION PINPOINT TEST 23: SHIFT CONCERNS: SOFT / SLIPPING 2- 3 ONLY (AUTOMATIC) , .

Soft/Slipping Shift 3-4,

See AUTOMATIC TRANSMISSION PINPOINT TEST 24: SHIFT CONCERNS: SOFT / SLIPPING 3-4 ONLY (AUTOMATIC) , .

Soft/Slipping Shift 4-3,

See AUTOMATIC TRANSMISSION PINPOINT TEST 25: SHIFT CONCERNS: SOFT / SLIPPING 4-3 DOWNSHIFTS , .

AUTOMATIC TRANSMISSION PINPOINT TEST 12 CHART - SHIFT CONCERNS (TIMING EARLY / LATE (SOME / ALL))

PINPOINT TEST 12		SHIFT CONCERNS: TIMING EARLY / LATE (SOME / ALL)
STEP	INSPECTION		ACTION
1	ELECTRICAL CONCERNS AND POWERTRAIN CONTROL SYSTEM PROBLEMS Perform shift point test. Run on-board diagnostics. See ON - BOARD DIAGNOSTIC TESTS , Does the following problem exist? No power to PCM, keep alive memory (KAM) erased from PCM. Faulty electrical inputs/outputs, vehicle wiring harnesses, internal transmission wiring harness, PCM, TP, TFT, EPC, VSS, SS1, SS2, RPM. DTC(s) in memory.	Yes	Inspect PCM power relay. Repair as required. Restore memory by performing drive cycle test. See DRIVE CYCLES , . See ON - BOARD DIAGNOSTIC TESTS , . See SHIFT SOLENOIDS SS1, SS2, SS3, SS4 AND TORQUE CONVERTER CLUTCH (TCC) SOLENOID 5R44E AND 5R55E ONLY , . See TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR 5R44E AND 5R55E ONLY , . See ELECTRONIC PRESSURE CONTROL (EPC) SOLENOID 5R44E AND 5R55E ONLY , . Repair as required, clear codes, road test and rerun on-board diagnostics.
1		No	Go to step 2.
2	POWER/ENGINE PERFORMANCE Does the following problem exist? Poor vehicle performance.	Yes	See AUTOMATIC TRANSMISSION PINPOINT TEST 36: OTHER CONCERNS: POOR VEHICLE PERFORMANCE , . See AUTOMATIC TRANSMISSION PINPOINT TEST 37: OTHER CONCERNS: POOR VEHICLE PERFORMANCE / WRONG GEAR RATIO IN D, 2ND AND 1ST POSITIONS , .
2		No	Go to step 3.
3	OTHER Do any of the following problems exist? Tire size change. Axle ratio change. Speedometer gear change.	Yes	See the specifications decal on door panel and verify that vehicle has original equipment. Changes in tire size or axle ratio affect shift timing.
3		No	Go to step 4.
4	FLUID Does the following problem exist? Improper level.	Yes	Adjust to proper level.
4	FLUID Does the following problem exist? Improper level.	No	Go to step 5.
5	IMPROPER PRESSURES Does the following problem exist? Improper band/clutch application pressures, line pressure low (late shifts).	Yes	Check line pressure at tap. Perform line pressure and stall speed tests. See AUTOMATIC TRANSMISSION SPECIAL TESTING PROCEDURE , and the line pressure chart for specifications.
5		No	Go to step 6.
6	CONTROL VALVE BODY Do any of the following problems exist? Screws not tightened to specification. Gasket damaged, off location. Separator plate damaged. SS1, SS2, SS3, EPC, solenoid stuck, damaged, O-ring damaged or out of bore. Verify correct solenoid and control spool operation.	Yes	Tighten screws to specification. Inspect and replace gasket. Inspect for damage. Repair as required. Repair or replace as necessary.
6		No	Go to SYMPTOM TROUBLESHOOTING CHART - AUTOMATIC TRANSMISSION , .