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Differential System: Inspection

WARNING: This page is about a different car, the 2007 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT 4 WHEEL DRIVE CONTROL SWITCH 
    1. Using an ohmmeter, measure the resistance between the terminals.
    4 WHEEL DRIVE CONTROL SWITCH

    Switch position Tester connection Specified condition
    H2 5 (2-4) - 4 (GND) Below 1 ohms
    H4 5 (2-4) -> 4 (GND) Below 1 ohms
    H4 5 (2-4) <- 4 (GND) 100 k ohms or higher
    Fig 1: Inspecting 4 Wheel Drive Control Switch
    G04369506Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If the result is not as specified, replace the four wheel drive control switch or bulb.

  2. INSPECT DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY 
    1. Measure the resistance between terminals 1 - 2.

      Standard resistance: 0.1 to 100 Ω 

    2. Measure the resistance between terminals 1 or 2 and the body ground.

      Standard resistance: 5 M Ω or more 

      If the result is not as specified, replace the differential vacuum actuator assembly.

    3. Apply the battery positive voltage between terminals 1 - 2, and check the actuator operation by sound, actuator status and resistance between terminals 3 - 4, 5 - 4 and 6 - 4.
    Fig 2: Inspecting Differential Vacuum Actuator Assembly
    G04369507Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY

    Battery voltage applied terminal 3 - 4 terminals resistance 5 - 4 terminals resistance 6 - 4 terminals resistance Actuator status
    1 (+) - 2 (-) Below 1 ohms Below 1 ohms 10 k ohms or higher Connected
    1 (-) - 2 (+) 10 k ohms or higher 10 k ohms or higher Below 1 ohms Disconnected
  3. INSPECT FOUR WHEEL DRIVE CONTROL ECU 
    1. Connect the wire harness side connector to the four wheel drive control ECU and inspect the wire harness side connector from the back side.
Fig 3: Inspecting Four Wheel Drive Control ECU
G04369508Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
FOUR WHEEL DRIVE CONTROL ECU

Terminals (Symbols) Conditions STD Voltage (V)
2 (TM1) - 1 (TM2)
  • Ignition switch ON
  • Differential lock switch in OFF position
  • Four wheel drive control switch H2 position -> H4 position
 10 to 14
1 (TM2) - 2 (TM1)
  • Ignition switch ON
  • Keep pressing differential lock switch for approx. 2 seconds to turn it ON
  • Four wheel drive control switch L4 position -> H4 position
 10 to 14
3 (DM1) - 4 (DM2)
  • Ignition switch ON
  • A.D.D. FREE -> LOCK
 10 to 14 or 0 to 14 pulse generation then less than 0.5
4 (DM2) - 3 (DM1)
  • Ignition switch ON
  • A.D.D. LOCK -> FREE
 10 to 14 or 0 to 14 pulse generation then less than 0.5
12 (GND) - Body ground Ignition switch OFF Below 1Ω
11 (IG) - 12 (GND) Ignition switch ON 10 to 14
18 (DL2) - 12 (GND)
  • Ignition switch ON
  • A.D.D. LOCK -> FREE
 1.5 or less -> 10 to 14
19 (DL1) - 12 (GND)
  • Ignition switch ON
  • A.D.D. FREE -> LOCK
 1.5 or less -> 10 to 14
25 (2-4) - 12 (GND)
  • Ignition switch ON
  • Four wheel drive control switch L4 position -> H2 position or H4 position
 10 to 14 -> 1.5 or less
26 (SPD) - 12 (GND) During driving Pulse generation
28 (IND3) - 12 (GND)
  • Ignition switch ON
  • Four wheel drive control switch H4 position --> L4 position
 10 to 14 --> 1.5 to 3.5
32 (LO) - 12 (GND)
  • Ignition switch ON
  • Four wheel drive control switch H4 position -> L4 position
 10 to 14 -> 1.5 or less
42 (ADD) - 12 (GND)
  • Ignition switch ON
  • A.D.D. FREE -> LOCK
 10 to 14 -> 1.5 or less
23 (L4) - 12 (GND)
  • Ignition switch ON
  • Four wheel drive control switch H2 position or H4 position -> L4 position
 10 to 14 -> 1.5 or less
38 (4WD) - 12 (GND)
  • Ignition switch ON
  • Four wheel drive control switch H2 position -> H4 position
 10 to 14 -> 1.5 or less
39 (TL3) - 12 (GND)
  • Ignition switch ON
  • Four wheel drive control switch H2 position -> L4 position
 10 to 14 -> 0.88 or less
40 (TL2) - 12 (GND)
  • Ignition switch ON
  • Four wheel drive control switch H2 position -> H4 position
 10 to 14 -> 0.88 or less
41 (TL1) - 12 (GND)
  • Ignition switch ON
  • Four wheel drive control switch H2 position -> H4 position or L4 position
 0.88 or less -> 10 to 14
45 (IND1) - 12 (GND)
  • Ignition switch ON
  • Four wheel drive control switch H2 position -> H4 position or L4 position
 10 to 14 -> 0 to 3.5
48 (N) - 12 (GND)
  • Ignition switch ON
  • Transmission shift lever other position -> N position
 1.5 or less -> 10 to 14
49 (MTN) - 12 (GND)
  • Ignition switch ON
  • Clutch start switch OFF position -> ON position
 10 to 14 -> 1.5 or less
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