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Inspection of TCM and Its Circuits: Inspection

WARNING: This page is about a different car, the 2006 Suzuki XL-7. However, it is still accessible from the selected car via links, so may be relevant.
  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: Identifying TCM, Connectors & Body Ground
    G04722568Courtesy of SUZUKI OF AMERICA CORP.
    Fig 2: Identifying TCM Coupler Terminal Arrangement
    G04722569Courtesy of SUZUKI OF AMERICA CORP.
CONNECTOR E228 REFERENCE

Connector: E228
Terminal Number Wire Color Circuit Normal Voltage Condition
1 WHT Power source for back-up 10 - 14 V 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 ↑ ↓ 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 ↑ ↓ 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 ↑ ↓ 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 V ↑ ↓ 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
CONNECTOR E229 REFERENCE

Connector: E229
Terminal Number Wire Color Circuit Normal Voltage Condition
1 BLU CAN communication line (Low) 2.5 - 3.6 V ↑ ↓ 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 ↑ ↓ 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 V ↑ ↓ 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

    REFERENCE WAVEFORM NO.1

    Measurement terminal CH1: E228-11 to E228-20
    Oscilloscope setting CH1: 5 V/DIV
    TIME: 2 ms/DIV
    Measurement condition
    • Ignition switch turned ON
    • Selector lever at "P" range
    Fig 3: Identifying Reference Waveform No.1
    G04722570Courtesy of SUZUKI OF AMERICA CORP.
  2. Reference waveform No.2

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

    REFERENCE WAVEFORM NO.2

    Measurement terminal CH1: E228-12 to E228-20
    Oscilloscope setting CH1: 5 V/DIV
    TIME: 2 ms/DIV
    Measurement condition
    • Ignition switch turned ON
    • Selector lever at "P" range
    Fig 4: Identifying Reference Waveform No.2
    G04722571Courtesy of SUZUKI OF AMERICA CORP.
  3. Reference waveform No.3

    Input shaft speed sensor signal at engine idling

    REFERENCE WAVEFORM NO.3

    Measurement terminal CH1: E228-17 to E228-20
    Oscilloscope setting CH1: 5 V/DIV
    TIME: 2 ms/DIV
    Measurement condition
    • After warmed up to normal operating temperature
    • Engine at idling speed (700 r/min.)
    Fig 5: Identifying Reference Waveform No.3
    G04722572Courtesy of SUZUKI OF AMERICA CORP.
  4. Reference waveform No.4

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

    REFERENCE WAVEFORM NO.4

    Measurement terminal CH1: E228-17 to E228-20
    Oscilloscope setting CH1: 5 V/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 6: Identifying Reference Waveform No.4
    G04722573Courtesy of SUZUKI OF AMERICA CORP.
  5. Reference waveform No.5

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

    REFERENCE WAVEFORM NO.5

    Measurement terminal CH1: E228-21 to E228-20
    Oscilloscope setting CH1: 5 V/DIV
    TIME: 2 ms/DIV
    Measurement condition
    • Ignition switch turned ON
    • Selector lever at "P" range
    Fig 7: Identifying Reference Waveform No.5
    G04722574Courtesy of SUZUKI OF AMERICA CORP.
  6. Reference waveform No.6

    TCC solenoid valve signal at ignition switch ON position

    REFERENCE WAVEFORM NO.6

    Measurement terminal CH1: E228-21 to E228-20
    Oscilloscope setting CH1: 5 V/DIV
    TIME: 2 ms/DIV
    Measurement condition
    • Ignition switch turned ON
    • Selector lever at "P" range
    Fig 8: Identifying Reference Waveform No.6
    G04722575Courtesy of SUZUKI OF AMERICA CORP.
  7. Reference waveform No.7

    CAN communication line signal at engine idling

    REFERENCE WAVEFORM 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 μs/DIV
    Measurement condition
    • After warmed up to normal operating temperature
    • Engine at idling speed (700 r/min.)
    Fig 9: Identifying Reference Waveform No.7
    G04722576Courtesy of SUZUKI OF AMERICA CORP.
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