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Inspection of TCM and Its Circuits: Inspection

  1. Remove TCM (1) from vehicle referring to "TRANSMISSION CONTROL MODULE (TCM) REMOVAL AND INSTALLATION  ".
  2. Connect TCM connectors (2) to TCM.
  3. Check voltage at each terminal of connectors connected.
NOTE: As each terminal voltage is affected by battery voltage, confirm that it is 11 V or more when ignition switch is ON.
Fig 1: Checking TCM Connector Terminals Voltage
G04099826Courtesy of SUZUKI OF AMERICA CORP.
TCM CONNECTOR TERMINALS VOLTAGE SPECIFICATION (CONNECTOR 228)

Connector: E228
Terminal Number Wire Color Circuit Normal Voltage Condition
1 WHT Power source for back-up 10 - 14V Constantly
2 - - - -
3 GRN/RED Shift solenoid valve-A 0 - 1 V Ignition switch ON
4 ORN/GRN Transmission range sensor ("D" range) 8 - 14 V Ignition switch ON, selector lever at "P" range
0 - 1 V Ignition switch ON, selector lever at other than "P" range
5 BLU/GRN Input shaft speed sensor (-) 2 - 3 V Ignition switch ON, engine at stop
6 ORN Output shaft speed sensor (-) 2 - 3 V Ignition switch ON, engine at stop
7 WHT/BLU Pressure control solenoid valve-C (-) 0.6 - 1.0 V Ignition switch ON
8 BLK/WHT Power source 10 - 14 V Ignition switch ON
9 BLK/WHT Power source 10 - 14 V Ignition switch ON
10 BLK/BLU Shift solenoid valve-E 9 - 14 V Ignition switch ON
11 RED/BLK Pressure control solenoid valve-C (+) 0 - 0.6 V
Min.
Max.
10 - 14 V (Reference waveform No.1)		 Ignition switch ON (Output signal is duty pulse.)
12 BRN/WHT Pressure control solenoid valve-A (+) 0 - 0.6 V
Min.
Max.
10 - 14 V (Reference waveform No.2)		 Ignition switch ON (Output signal is duty pulse.)
13 - - - -
14 GRN/ORN Transmission range sensor ("3" range) 8 - 14 V Ignition switch ON, selector lever at "3" range
0 - 1 V Ignition switch ON, selector lever at other than "3" range
15 ORN/BLU Transmission range sensor ("N" range) 8 - 14 V Ignition switch ON, selector lever at "N" range
0 - 1 V Ignition switch ON, selector lever at other than "N" range
16 RED Transmission range sensor ("R" range) 8 - 14 V Ignition switch ON, selector lever at "R" range
0 - 1 V Ignition switch ON, selector lever at other than "R" range
17 BLU/YEL Input shaft speed sensor (+) 2 - 3 V Ignition switch turned ON, engine stops.
(Reference waveform No.3) While engine running. (Output signal is waveform. Waveform frequency varies depending on input shaft speed. (24 pulses are generated par 1 input shaft revolution.))
18 WHT Output shaft speed sensor (+) 2 - 3 V Ignition switch turned ON, engine stops.
(Reference waveform No.4) Vehicle running. (Output signal is waveform. Waveform frequency varies depending on output shaft speed. (18 pulses are generated par 1 output shaft revolution.))
19 PPL TCC solenoid valve (-) 0.6 - 1.0 V Ignition switch ON
20 BLK/ORN Ground 0 - 1 V Ignition switch ON
21 BLK/ORN Pressure control solenoid valve-B (+) 0 - 0.6 V
Min.
Max.
10 - 14 V (Reference waveform No.5)		 Engine running at idling (Output signal is duty pulse.)
22 GRN Shift solenoid valve-A 9 - 14 V Ignition switch ON
23 GRN/YEL TCC solenoid valve (+) 0 - 0.6
Min.
Max.
10 - 14 V (Reference waveform No.6)		 Ignition switch ON (Output signal is duty pulse.)
24 GRN/BLU Transmission range sensor ("L" range) 8 - 14 V Ignition switch ON, selector lever at "L" range
0 - 1 V Ignition switch ON, selector lever at other than "L" range
25 YEL/GRN Transmission range sensor ("D" range) 8 - 14 V Ignition switch ON, selector lever at "D" range
0 - 1 V Ignition switch ON, selector lever at other than "D" range
26 ORN Transmission fluid temperature sensor A (-) 0 - 1 V Ignition switch ON
27 YEL/BLK Transmission fluid temperature sensor A (+) 2.9 - 3.1 V Ignition switch ON, fluid temperature is 20 °C (68 °F)
0.7 - 0.9 V Ignition switch ON, fluid temperature is 80 °C (176 °F)
28 BRN/RED Pressure control solenoid valve-A (-) 0.6 - 1.0 V Ignition switch ON
TCM CONNECTOR TERMINALS VOLTAGE SPECIFICATION (CONNECTOR 229)

Connector: E229
Terminal Number Wire Color Circuit Normal Voltage Condition
1 BLU CAN communication line (Low) 2.5 - 3.6 V
Min.
Max.
1.6 - 2.5 V (Reference waveform No.7)		 Engine running at idling with after warming up. (CAN communication signal is pulse. Pulse signal frequency varies depending on engine condition.)
2 RED CAN communication line (High) 2.5 - 3.6 V
Min.
Max.
1.6 - 2.5 V (Reference waveform No.7)		 Engine running at idling with after warming up. (CAN communication signal is pulse. Pulse signal frequency varies depending on engine condition.)
3 - - - -
4 - - - -
5 BLU/YEL Transmission fluid temperature sensor B (+) 2.9 - 3.1 V Ignition switch ON, fluid temperature is 20 °C (68 °F)
0.7 - 0.9 V Ignition switch ON, fluid temperature is 80 °C (176 °F)
6 GRY Transmission fluid temperature sensor B (-) 0 - 1 V Ignition switch ON
7 YEL Data link connector 8 - 14 V Ignition switch ON
8 - - - -
9 WHT/BLK "O/D OFF" light 0 - 1 V Ignition switch ON (lamp turned ON)
8 - 14 V Ignition switch ON (lamp turned OFF)
10 BLU/YEL VSS signal (2WD model only) 0 - 0.6
Min.
Max.
10 - 14 V		 Vehicle running. (Sensor signal is pulse. Pulse frequency varies depending on vehicle speed. (2572 pulses are generated par 60 km/h, 37.5 mile/h.))
11 - - - -
12 PPL/YEL Diagnosis switch 8 - 14 V Ignition switch ON
13 ORN/BLU Power mode switch 0 - 1 V Power mode switch ON
8 - 14 V Power mode switch OFF
14 BLU/RED Pressure control solenoid valve-B (-) 0.6 - 1.0 V Ignition switch ON
15 YEL/RED O/D OFF switch 0 - 1 V O/D OFF switch pressed
8 - 14 V O/D OFF switch released
16 - - - -
17 - - - -
18 ORN/WHT 4WD low switch 0 - 1 V 4WD low switch ON
8 - 14 V 4WD low switch OFF
19 - - - -
20 BLK/ORN Ground 0 - 1 V Ignition switch ON
  1. Reference waveform No.1

    Pressure control solenoid valve-C signal at ignition switch ON position

    WAVEFORM REFERENCE (NO 1)

    Measurement terminal CH1: E228-11 to E228-20
    Oscilloscope setting CH1: 5V/DIV TIME: 2 ms/DIV
    Measurement condition
    • Ignition switch turned ON
    • Selector lever at "P" range
    Fig 2: Reference Waveform Graph (No 1)
    G04099827Courtesy of SUZUKI OF AMERICA CORP.
  2. Reference waveform No.2

    Pressure control solenoid valve-A signal at ignition switch ON position

    WAVEFORM REFERENCE (NO 2)

    Measurement terminal CH1: E228-12 to E228-20
    Oscilloscope setting CH1: 5V/DIV TIME: 2 ms/DIV
    Measurement condition
    • Ignition switch turned ON
    • Selector lever at "P" range
    Fig 3: Reference Waveform Graph (No 2)
    G04099828Courtesy of SUZUKI OF AMERICA CORP.
  3. Reference waveform No.3

    Input shaft speed sensor signal at engine idling

    WAVEFORM REFERENCE (NO 3)

    Measurement terminal CH1: E228-17 to E228-20
    Oscilloscope setting CH1: 5V/DIV TIME: 2 ms/DIV
    Measurement condition
    • After warmed up to normal operating temperature
    • Engine at idling speed (700 r/min.)
    Fig 4: Reference Waveform Graph (No 3)
    G04099829Courtesy of SUZUKI OF AMERICA CORP.
  4. Reference waveform No.4

    Output shaft speed sensor signal at vehicle speed 20km/h, 12.5mile/h

    WAVEFORM REFERENCE (NO 4)

    Measurement terminal CH1: E228-17 to E228-20
    Oscilloscope setting CH1: 5V/DIV TIME: 2 ms/DIV
    Measurement condition
    • After warmed up to normal operating temperature
    • Vehicle speed at 20 km/h, 12.5 mile/h
    Fig 5: Reference Waveform Graph (No 4)
    G04099830Courtesy of SUZUKI OF AMERICA CORP.
  5. Reference waveform No.5

    Pressure control solenoid valve-B signal at ignition switch ON position

    WAVEFORM REFERENCE (NO 5)

    Measurement terminal CHI: E228-21 to E228-20
    Oscilloscope setting CH1: 5V/DIV TIME: 2 ms/DIV
    Measurement condition
    • Ignition switch turned ON
    • Selector lever at "P" range
    Fig 6: Reference Waveform Graph (No 5)
    G04099831Courtesy of SUZUKI OF AMERICA CORP.
  6. Reference waveform No.6

    TCC solenoid valve signal at ignition switch ON position

    WAVEFORM REFERENCE (NO 6)

    Measurement terminal CH1: E228-21 to E228-20
    Oscilloscope setting CH1: 5V/DIV TIME: 2 ms/DIV
    Measurement condition
    • Ignition switch turned ON
    • Selector lever at "P" range
    Fig 7: Reference Waveform Graph (No 6)
    G04099832Courtesy of SUZUKI OF AMERICA CORP.
  7. Reference waveform No.7

    CAN communication line signal at engine idling

WAVEFORM REFERENCE (NO 7)

Measurement terminal CH1: E229-1 to E228-20, CH2: E229-2 to E228-20
Oscilloscope setting CH1: 1 V/DIV, CH2: 1 V/DIV TIME: 100 micro s/DIV
Measurement condition
  • After warmed up to normal operating temperature
  • Engine at idling speed (700 r/min.)
Fig 8: Reference Waveform Graph (No 7)
G04099833Courtesy of SUZUKI OF AMERICA CORP.
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