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Inspection Of TCM And Its Circuits: Notes

WARNING: This page is about a different car, the 2006 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.

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

CAUTION: TCM cannot be checked by itself, it is strictly prohibited to connect voltmeter or ohmmeter to TCM with connector disconnected from it.
  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 if necessary.
    Fig 1: Checking Voltage At Terminal Of TCM Connectors
    G04808563Courtesy of SUZUKI OF AMERICA CORP.

    Terminal arrangement of TCM coupler (Viewed from harness side)

    Fig 2: Identifying TCM Coupler Terminal Arrangement
    G04808564Courtesy of SUZUKI OF AMERICA CORP.

Connector "E92"

TERMINALS REFERENCE CHART

Terminal number Wire color Circuit Normal Voltage Condition
1 BLK/ORN Ground 0 - 1V 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-A (+) *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 opening condition.)
6 BLK/WHT Power source 10 - 14 V Ignition switch ON
7 WHT CAN communication line (active low signal) *1.6 - 2.8 V
(Reference Waveform No. 3  )		 Engine running at specified idling speed.
(CAN communication signal is pulse. Pulse signal frequency varies depending on engine condition.)
8 - - - -
9 LT GRN/RED Pressure control solenoid valve-B (-) 0.6 - 1.0 V Ignition switch ON
10 GRY Transmission fluid temperature sensor-B (-) 0 - 1 V Ignition switch ON
11 YEL/BLK Transmission fluid temperature sensor-A (+) 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/RED Shift solenoid valve-E 0 - 1 V Ignition switch ON
15 GRN/RED Shift solenoid valve-B 0 - 1 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 (active high signal) *2.5 - 3.8 V
(Reference Waveform No. 3  )		 Engine running at specified idling speed.
(CAN communication signal is pulse. Pulse signal frequency varies depending on engine condition.)
18 - - - -
19 BRN/BLU Pressure control solenoid valve-C (--) 0.6 - 1.0 V Ignition switch ON
20 GRY/BLU Transmission fluid temperature sensor-B (+) Ignition switch ON, fluid temperature is 20°C (68°F) Ignition switch ON, fluid temperature is 20°C (68°F)
Ignition switch ON, fluid temperature is 100°C (212°F) Ignition switch ON, fluid temperature is 100°C (212°F)
21 LT GRN Pressure control solenoid valve-C (+) *0 - 0.6 V
↑↓
10 - 14 V
(Reference Waveform No. 4  )		 Ignition switch ON, select lever in "P" range (Output signal is duty pulse.)
22 LT GRN/BLK 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.)
23 BLK/ORN Ground 0 - 1 V Ignition switch ON
24 WHT Power source for back-up 10 - 14 V Constantly

Connector "E93"

TERMINALS REFERENCE CHART

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 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 (+) 2 - 3 V Ignition switch turned ON, engine stops.
*(Reference Waveform No. 6  ) 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 (+) 2 - 3 V Ignition switch turned ON, engine stops.
*(Reference Waveform No. 7  ) While engine running.
Output signal is waveform. Waveform frequency varies depending on input 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 "R" range
0 - 1 V Ignition switch ON, selector lever at other than "R" 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 "4" position switch (+) 2.4 - 4.3 V Ignition switch ON, select lever in "P", "N" or "D" range
8 - 14 V Ignition switch ON, select lever in "R", "3", "2" or "L" range
10 - - - -
11 - - - -
12 - - - -
13 - - - -
14 ORN Output shaft speed sensor (-) 2 - 3 V Ignition switch ON, vehicle 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, select lever at "L" range
0 - 1 V Ignition switch ON, select lever at other than "L" range
19 GRN/ORN Transmission range sensor ("3" range) 8 - 14 V Ignition switch ON, select lever at "2" range
0 - 1 V Ignition switch ON, select lever at other than "2" range
20 PNK/GRN Transmission range sensor ("P" range) 8 - 14 V Ignition switch ON, select lever at "P" range
0 - 1 V Ignition switch ON, select lever at other than "P" range
21 YEL/BLK "4" position switch (-) 0 - 1 V Ignition switch ON
22 - - - -
23 PPL/WHT Data link connector 8 - 14 V Ignition switch ON
24 - - - -
25 - - - -
26 - - - -
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