Electrical repair

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A/T SYMPTOM DIAGNOSIS PROCEDURE 1

Condition	Possible Cause	Action
No up-shift (fixed gear position)	Battery voltage abnormality	Inspect charging system referring to GENERATOR TEST (UNDERCHARGED BATTERY CHECK)or GENERATOR TEST (OVERCHARGED BATTERY CHECK) .
	Input shaft speed sensor circuit faulty	Inspect circuit for open, short and intermittent. If NG, repair .
	Output shaft speed sensor circuit faulty	Inspect circuit for open, short and intermittent. If NG, repair .
	Pressure control solenoid valve circuit faulty	Inspect circuit for open, short and intermittent. If NG, repair .
	Shift solenoid valve-A (No. 1) circuit faulty	Inspect circuit for open, short and intermittent. If NG, repair .
	Shift solenoid valve-B (No. 2) circuit faulty	Inspect circuit for open, short and intermittent. If NG, repair .
	Engine torque signal circuit faulty	Inspect circuit for open, short and intermittent. If NG, repair .
	Engine speed signal circuit faulty	Inspect circuit for open, short and intermittent. If NG, repair .
	Throttle position signal circuit faulty	Inspect circuit for open, short and intermittent. If NG, repair .
	TCM	Substitute a known-good TCM and recheck .
	ECM	Substitute a known-good ECM and recheck .
Poor 1 --> 2 shift	Transmission range sensor circuit faulty	Inspect circuit for open, short and intermittent. If NG, repair .
	TCM	Substitute a known-good TCM and recheck .
	ECM	Substitute a known-good ECM and recheck .
Poor 2 --> 3 shift	Transmission range sensor circuit faulty	Inspect circuit for open, short and intermittent. If NG, repair .
	TCM	Substitute a known-good TCM and recheck .
	ECM	Substitute a known-good ECM and recheck .
Poor 3 --> O/D shift	Transmission range sensor circuit faulty	Inspect circuit for open, short and intermittent. If NG, repair .
	Engine coolant temperature sensor signal circuit faulty	Inspect circuit for open, short and intermittent. If NG, repair .
	Engine coolant temperature sensor circuit faulty	Inspect circuit for open, short and intermittent referring to ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION . If NG, repair .
	O/D off switch circuit faulty	Refer to NO GEAR SHIFT TO O/D .
	TCM	Substitute a known-good TCM and recheck .
	ECM	Substitute a known-good ECM and recheck .
Incorrect gear shift point	Throttle position sensor circuit faulty	Inspect circuit for open, short and intermittent referring to THROTTLE POSITION (TP) SENSOR ON-VEHICLE INSPECTION . If NG, repair .
	TCM	Substitute a known-good TCM and recheck .
	ECM	Substitute a known-good ECM and recheck .
Non operate TCC (lock-up) system	TCC solenoid valve circuit faulty	Inspect circuit for open, short and intermittent. If NG, repair .
	Transmission range sensor circuit faulty	Inspect circuit for open, short and intermittent. If NG, repair .
	Transmission fluid temperature sensor circuit faulty	Inspect circuit for open, short and intermittent. If NG, repair .
	Throttle position sensor circuit faulty	Inspect circuit for open, short and intermittent referring to THROTTLE POSITION (TP) SENSOR ON-VEHICLE INSPECTION . If NG, repair .
	Engine coolant temperature sensor circuit faulty	Inspect circuit for open, short and intermittent referring to ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION . If NG, repair .
	Brake light switch circuit faulty	Refer to NO LOCK-UP OCCURS .
	Cruise control module	Inspect cruise control module referring to CRUISE CONTROL MODULE AND ITS CIRCUIT INSPECTION .
	TCM	Substitute a known-good TCM and recheck .
	ECM	Substitute a known-good ECM and recheck .
Higher or lower stall speed	Pressure control solenoid valve circuit faulty	Inspect circuit for open, short and intermittent. If NG, repair .
Higher or lower stall speed	TCM	Substitute a known-good TCM and recheck .
Excessive "N"-->"D" or "N"-->"R" time lag	Pressure control solenoid valve circuit faulty	Inspect circuit for open, short and intermittent. If NG, repair .
Excessive "N"-->"D" or "N"-->"R" time lag	TCM	Substitute a known-good TCM and recheck .
Higher or lower line pressure	Pressure control solenoid valve circuit faulty	Inspect circuit for open, short and intermittent. If NG, repair .
Higher or lower line pressure	TCM	Substitute a known-good TCM and recheck .