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Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 1885
DIAGNOSIS 7A2-156
TCM VOLTAGE CHECK
TCM voltage check is done to check for transmission and TCM
problems which cannot be detected by self-diagnosis.
Additionally, it severs as a back-up check for self-diagnosis.
Measure the voltage drop and make a continuity test for each of
sensors, solenoids and switches.
If the voltage is within the specified range and continuity exists,
that particular area of the TCM and transmission assembly is
normal.
If voltage deviation or lack of continuity is discovered, disconnect
the applicable parts and check of them individually.
Inspection Tool
Use a circuit tester and an oscilloscope to measure voltage and
circuit continuity.
Insert the test probes from the connector wiring side. TCM
terminals are extremely small.
Wrap a piece of thin wire around the probe of tester.
This will make measurement easier.
TCM Pin Assignment
Connect to White Connector Connect to Grey Connector
No.
Wire
Color
Pin Name
Input /
Output
Connected to
Measurement
Item
Measurement
Condition
Standard
Inspection
Point at
Trouble
A1
RED
V BATT (Battery Back-up Power
Supply)
Input
Battery Voltage
-
Battery
voltage
Related
harness
At P range
Battery
voltage
Related
harness
A2
YEL/
VIO
P Range Switch
Input
Inhibitor switch
Voltage
At other than
P range
Less than 2V
Inhibitor
switch
At brake
stepped
Battery
voltage
Related
harness
A3
RED Brake
Switch
Input
Brake
switch
Voltage
At brake no
stepped
Less than 2V Brake switch
At lamp OFF
Battery
voltage
Related
harness
A4
PNK/
WHT
3rd Start Indicator Lamp
Output 3rd start lamp
Voltage
At lamp ON
Less than 2V Lamp
A5
GRN
K-line signal (Tech 2 serial
communication)
Input/
Output
Tech 2
-
-
-
Related
harness
A6
- -
- -
-
-
-
-