PCM INSPECTION [FN4A-EL]

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Note

•  The PCM terminal voltage can vary with conditions when measuring and changes due to age deterioration on the vehicle, causing false diagnosis. Therefore a comprehensive inspection of the input and output systems, and the PCM is necessary to determine where the malfunction occurs.

1.  Connect the voltmeter (-) lead to body GND.

2.  Measure the voltage at each terminal.

•  If any incorrect voltage is detected, inspect the related system(s), wiring harnesses and connector(s) referring to the “Inspection Item” column in the “PCM Terminal Voltage”.

PCM Terminal Voltage (Reference)

Note

•  Only the transaxle-related information is described.

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Terminal	Connected to	Test Condition	Voltage (V)	Inspection Item
2A	Shift solenoid B	(See Shift solenoid B.)		•  Shift solenoid B (See SOLENOID VALVE INSPECTION [FN4A-EL].) •  Related harness
2AB	TFT sensor	ATF temperature 20 °C	Approx. 3.3	•  TFT sensor (See TRANSAXLE FLUID TEMPERATURE (TFT) SENSOR INSPECTION [FN4A-EL].) •  Related harness
		ATF temperature 65 °C	Approx. 1.3
2AJ	Pressure control solenoid (+)	(See Pressure control solenoid (+).)		•  Pressure control solenoid (See SOLENOID VALVE INSPECTION [FN4A-EL].) •  Related harness
2AO	Pressure control solenoid (-)	(See Pressure control solenoid (-).)		•  Pressure control solenoid (See SOLENOID VALVE INSPECTION [FN4A-EL].) •  Related harness
2AR	Input/turbine speed sensor shield wire	Under any condition	Below 1.0	•  Related harness
2AT	Shift solenoid D	D position 1GR	Below 1.0	•  Shift solenoid D (See SOLENOID VALVE INSPECTION [FN4A-EL].) •  Related harness
		D position 2GR	Below 1.0
		D position 3GR	Below 1.0
		D position 4GR	B+
2AY	Shift solenoid E	TCC released	Below 1.0	•  Shift solenoid E (See SOLENOID VALVE INSPECTION [FN4A-EL].) •  Related harness
		TCC engaged	B+
2BA	Input/turbine speed sensor (-)	(See Input/turbine speed sensor.)		•  Input/turbine speed sensor (See INPUT/TURBINE SPEED SENSOR INSPECTION [FN4A-EL].) •  Related harness
2BB	TR switch, TFT sensor	Under any condition	Below 1.0	•  Related harness
2BF	Input/turbine speed sensor (+)	(See Input/turbine speed sensor.)		•  Input/turbine speed sensor (See INPUT/TURBINE SPEED SENSOR INSPECTION [FN4A-EL].) •  Related harness
2BG	TR switch	P position	4.3—4.8	•  TR switch (See TRANSAXLE RANGE (TR) SWITCH INSPECTION [FN4A-EL].) •  Related harness
		R position	3.8—4.2
		N position	3.0—3.5
		D position	2.2—2.7
		M position	2.2—2.7
2BI	Shift solenoid C	(See Shift solenoid C.)		•  Shift solenoid C (See SOLENOID VALVE INSPECTION [FN4A-EL].) •  Related harness
2BJ	Shift solenoid A	(See Shift solenoid A.)		•  Shift solenoid A (See SOLENOID VALVE INSPECTION [FN4A-EL].) •  Related harness

Input/Output Wave From (Reference)

Shift solenoid A

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•  PCM terminals

2BJ (+)—body GND (-)

•  Oscilloscope setting

5 V/DIV (Y), 5 ms/DIV (X), DC range

•  Test Condition

D position 4GR

Shift solenoid B

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•  PCM terminals

2A (+)—body GND (-)

•  Oscilloscope setting

5 V/DIV (Y), 5 ms/DIV (X), DC range

•  Test Condition

D position 1GR

Shift solenoid C

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•  PCM terminals

2BI (+)—body GND (-)

•  Oscilloscope setting

5 V/DIV (Y), 5 ms/DIV (X), DC range

•  Test Condition

D position 1GR

Pressure control solenoid (+)

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•  PCM terminals

2AJ (+)—body GND (-)

•  Oscilloscope setting

5 V/DIV (Y), 1 ms/DIV (X), DC range

•  Test Condition

The following conditions are met:

―  Ignition switch ON (engine off)

―  P position

―  Accelerator pedal fully depressed

Pressure control solenoid (-)

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•  PCM terminals

2AO (+)—body GND (-)

•  Oscilloscope setting

200 mV/DIV (Y), 1 ms/DIV (X), DC range

•  Test Condition

The following conditions are met:

―  Ignition switch ON (engine off)

―  P position

―  Accelerator pedal fully depressed

Input/turbine speed sensor

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•  PCM terminals

2BF (+)—2BA (-)

•  Oscilloscope setting

1 V/DIV (Y), 2 ms/DIV (X), DC range

•  Test Condition

Idle at P position after warm-up