Symptom Chart

SYMPTOM CHART

Condition	Possible Sources	Action
Transmission overheating	Excessive vehicle or towing loads, severe vehicle use.	REFER to the vehicle specification information for load and GVW/GCW information. REFER to the Owner's Guide.
Incorrect fluid level.		CHECK and, if necessary, ADJUST the fluid to the correct level. REFER to AUTOMATIC TRANSMISSION - 4R100 or AUTOMATIC TRANSMISSION - 4R70W .
Fluid condition.		CHECK fluid condition. REFER to AUTOMATIC TRANSMISSION - 4R100 or AUTOMATIC TRANSMISSION - 4R70W .
Incorrect fluid type.		REFER to SPECIFICATIONS .
Transmission cooling system damaged, blocked, restricted or installed incorrectly.		CARRY OUT the transmission fluid cooler flow test. REFER to AUTOMATIC TRANSMISSION - 4R100 or AUTOMATIC TRANSMISSION - 4R70W .
Cooler bypass valve (CBV) assembly (4R100 only) damaged, blocked, restricted or installed incorrectly.		INSPECT for damage and restrictions. If necessary, REFER to COOLER BYPASS VALVE - 4R100 TRANSMISSION for removal and installation. REFER to AUTOMATIC TRANSMISSION - 4R100 for flushing and cleaning procedure.
System leaks.		REFER to AUTOMATIC TRANSMISSION - 4R100 or AUTOMATIC TRANSMISSION - 4R70W for leakage inspection procedures.
Engine overheating.		REFER to ENGINE COOLING .
Powertrain control system electrical inputs/outputs, vehicle wiring harnesses, powertrain control module (PCM), torque converter clutch (TCC) solenoid.		CARRY OUT on-board diagnostics. REFER to the SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV , and to AUTOMATIC TRANSMISSION - 4R100 or AUTOMATIC TRANSMISSION - 4R70W .
Internal transmission concerns.		REFER to AUTOMATIC TRANSMISSION - 4R100 or AUTOMATIC TRANSMISSION - 4R70W .
Fluid leak at transmission intank cooler	Transmission fluid coolerto-fluid cooler fitting.	REFER to the COMPONENT TEST .