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Inspection of TCM and Its Circuits: Notes

TCM and its circuits can be checked at TCM wiring connectors by measuring voltage, pulse signal and resistance.

NOTE: If you connect a voltmeter or an ohmmeter directly to the TCM terminals by removing the TCM connectors, you can damage the TCM.
Never connect a voltmeter or an ohmmeter directly to any terminal on the TCM by disconnecting the TCM connectors.
  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 and/or pulse signal at each terminal of connectors connected using voltmeter (3) and oscilloscope (4).
    NOTE:
    • As each terminal voltage is affected by battery voltage, confirm that it is 11 V or more when ignition switch is ON.
    • Voltage with asterisk (*) cannot be measured by voltmeter because it is pulse signal. Check it with oscilloscope.
    Fig 1: Checking Voltage And/Or Pulse Signal At TCM Connector Terminals
    G08898852Courtesy of SUZUKI OF AMERICA CORP.
    Fig 2: TCM Connector Terminals Arrangement
    G08898853Courtesy of SUZUKI OF AMERICA CORP.
CONNECTOR "E92"

Terminal Wire color Circuit Standard voltage Condition
1 BLK/ORN Ground 0 - 1 V Ignition switch ON
2 BRN/RED Pressure control solenoid valve (-) 0.6 - 1.0 V Ignition switch ON
3 PPL/WHT TCC pressure control solenoid valve (-) 0.6 - 1.0 V Ignition switch ON
4 YEL/RED Pressure control solenoid valve (+) *0 - 0.6 V
↑↓
10 - 14 V
(Reference Waveform No. 1 )		 Engine running at idling.
(Output signal is duty pulse. Duty ratio varies depending on throttle valve opening.)
5 GRN/YEL TCC pressure control solenoid valve (+) *0 - 0.6 V
↑↓
10 - 14 V
(Reference Waveform No. 2 )		 Engine running at idling.
(Output signal is duty pulse. Duty ratio varies depending on torque converter clutch operating condition.)
6 BLK/WHT Power source 10 - 14 V Ignition switch ON
7 WHT CAN communication line (Low) *2.5 - 3.6 V
↑↓
1.6 - 2.5 V
(Reference Waveform No. 3 )		 Engine running at idling with after warming up. (CAN communication signal is pulse. Pulse signal frequency varies depending on engine condition.))
8 - - - -
9 LT GRN/RED No internal connection
10 - - - -
11 YEL/BLK Transmission fluid temperature sensor (+) 2.9 - 3.1 V Ignition switch ON, fluid temperature is 20 °C (68 °F)
0.3 - 0.5 V Ignition switch ON, fluid temperature is 100 °C (212 °F)
12 ORN Transmission fluid temperature sensor (-) 0 - 1 V Ignition switch ON
13 - - - -
14 GRN/BLK No internal connection
15 GRN/RED Shift solenoid valve-B 9 - 14 V Ignition switch ON, select lever in "P" range
16 GRN Shift solenoid valve-A 9 - 14 V Ignition switch ON, select lever in "P" range
17 RED CAN communication line (High) *2.5 - 3.6 V
↑↓
1.6 - 2.5 V
(Reference Waveform No. 3 )		 Engine running at idling with after warming up. (CAN communication signal is pulse. Pulse signal frequency varies depending on engine condition.)
18 - - - -
19 BRN/BLU No internal connection
20 - - - -
21 LT GRN No internal connection
22 LT GRN/BLK No internal connection
23 BLK/ORN Ground 0 - 1 V Ignition switch ON
24 WHT Power source for back-up 10 - 14 V Constantly
CONNECTOR "E93"

Terminal Wire color Circuit Standard voltage Condition
1 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
2 - - - -
3 - - - -
4 PNK/WHT 4L/N switch (if equipped) 8 - 14 V Ignition switch ON, transfer position in 4H
0 - 1 V Ignition switch OFF, transfer position in 4L and N
5 WHT Output shaft speed sensor (+) 0 - 1 V Ignition switch ON, engine stops
*
(Reference Waveform No. 4 )		 While engine running.
(Output signal is waveform. Waveform frequency varies depending on output shaft speed. (18 pulses are generated par 1 input shaft revolution.))
6 BLU Input shaft speed sensor (+) 0 - 1 V Ignition switch ON, engine stops.
*
(Reference Waveform No. 5 )		 While engine running.
(Output signal is waveform. Waveform frequency varies depending on output shaft speed. (24 pulses are generated par 1 input shaft revolution.))
7 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
8 PNK/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
9 YEL/RED 3 position switch (+) 2.4 - 4.3 V Ignition switch ON, select lever in "P", "R", "N" or "D" range
0.8 - 2.4 V Ignition switch ON, select lever in "3", "2" or "L" range
10 - - - -
11 - - - -
12 - - - -
13 - - - -
14 ORN Output shaft speed sensor (-) 2 - 3 V Ignition switch ON, engine at stop
15 - - - -
16 PNK Input shaft speed sensor (-) 2 - 3 V Ignition switch ON, engine at stop
17 - - - -
18 GRN/WHT 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
19 GRN/ORN Transmission range sensor ("2" range) 8 - 14 V Ignition switch ON, selector lever at "2" range
0 - 1 V Ignition switch ON, selector lever at other than "2" range
20 PNK/GRN Transmission range sensor ("P" 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
21 YEL/BLK 3 position switch (-) 0 - 1 V Ignition switch ON
22 - - - -
23 - - - -
24 - - - -
25 - - - -
26 - - - -
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