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
1A
Input/turbine speed sensor shield wire
Under any condition
Below 1.0
•  Related harness
1D
Shift solenoid A
(See Shift solenoid A.)
•  Shift solenoid A
•  Related harness
1H
Shift solenoid B
(See Shift solenoid B.)
•  Shift solenoid B
•  Related harness
1J
Down switch
Selector lever down-shift position
Below 1.0
•  Down switch
•  Related harness
Except selector lever down-shift position
B+
1K
Shift solenoid D
D range 1GR
Below 1.0
•  Shift solenoid D
•  Related harness
D range 2GR
Below 1.0
D range 3GR
Below 1.0
D range 4GR
B+
1L
Shift solenoid C
(See Shift solenoid C.)
•  Shift solenoid C
•  Related harness
1M
Up switch
Selector lever up-shift position
Below 1.0
•  Up switch
•  Related harness
Except selector lever up-shift position
B+
1N
M range switch
M range
Below 1.0
•  M range switch
•  Related harness
Except M range
B+
1O
Shift solenoid E
TCC released
Below 1.0
•  Shift solenoid E
•  Related harness
TCC engaged
B+
1P
Pressure control solenoid (+)
(See Pressure control solenoid (+).)
•  Pressure control solenoid
•  Related harness
1R
Input/turbine speed sensor (+)
(See Input/turbine speed sensor.)
•  Input/turbine speed sensor
•  Related harness
1T
Pressure control solenoid (-)
(See Pressure control solenoid (-).)
•  Pressure control solenoid
•  Related harness
1V
Input/turbine speed sensor (-)
(See Input/turbine speed sensor.)
•  Input/turbine speed sensor
•  Related harness
1AG
TR switch, TFT sensor
Under any condition
Below 1.0
•  Related harness
1AH
TFT sensor
ATF temperature 20 °C
Approx. 3.3
•  TFT sensor
•  Related harness
ATF temperature 65 °C
Approx. 1.3
1AS
TR switch
P position
4.3—4.8
•  TR switch
•  Related harness
R position
3.8—4.2
N position
3.0—3.5
D range
2.2—2.7
M range
2.2—2.7
1AX
VSS
(See VSS.)
•  VSS
•  Related harness


Input/Output Wave From (Reference)


Shift solenoid A

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•  PCM terminals
1D (+)—body GND (-)
•  Oscilloscope setting
5 V/DIV (Y), 5 ms/DIV (X), DC range
•  Test Condition
D range 4GR


Shift solenoid B

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•  PCM terminals
1H (+)—body GND (-)
•  Oscilloscope setting
5 V/DIV (Y), 5 ms/DIV (X), DC range
•  Test Condition
D range 1GR


Shift solenoid C

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•  PCM terminals
1L (+)—body GND (-)
•  Oscilloscope setting
5 V/DIV (Y), 5 ms/DIV (X), DC range
•  Test Condition
D range 1GR


Pressure control solenoid (+)

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•  PCM terminals
1P (+)—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
1T (+)—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
1R (+)—1V (-)
•  Oscilloscope setting
1 V/DIV (Y), 2 ms/DIV (X), DC range
•  Test Condition
Idle at P position after warm-up


VSS

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•  PCM terminals
1AX (+)—body GND (-)
•  Oscilloscope setting
1 V/DIV (Y), 2.5 ms/DIV (X), DC range
•  Test Condition
Vehicle speed at 30 km/h {19 mph}.