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Use the following steps to remove the connector cover and measure the terminal voltage.
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1.Move the lock lever of the ABS-ECU connector A-01 as shown in the illustration, and then disconnect the ABS-ECU connector A-01.
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2.Connect special tool ABS check harness (MB991952) to measure the voltages between each check connector terminals and earth terminals 11 or 33.
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1.Measure the voltages between earth terminal (11) or (33) and each respective terminal.
2.The terminal layouts are shown in the illustrations below.
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Do not measure terminal voltage for approximately three seconds after the ignition switch is turned to the "ON" position. The ABS-ECU performs the initial check during that period.
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Terminal No.
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Check item
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Checking requirements
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Normal condition
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3
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Stop lamp switch input
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Stop lamp switch: "ON"
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System voltage
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Stop lamp switch: "OFF"
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Approximately 0 V
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6
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G-sensor (earth) <4WD>
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Always
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Approximately 0 V
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9
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G-sensor (input) <4WD>
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Ignition switch: "ON"
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Approximately 5 V
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12
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Solenoid valve power supply
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Ignition switch: "ON"
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System voltage
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22
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ABS warning lamp output
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Ignition switch: "ON" (When ABS warning lamp is ON.)
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2 V or less
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Ignition switch: "ON" (When ABS warning lamp is OFF.)
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System voltage
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25
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Brake warning lamp output
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Ignition switch: "ON" (When brake warning lamp is ON.)
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2 V or less
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Ignition switch: "ON" (When brake warning lamp is OFF.)
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System voltage
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29
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G-sensor (Output) <4WD>
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- Ignition switch: "ON"
- Vehicle on a level surface
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2.4 - 2.6 V
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32
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ABS-ECU power supply
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Ignition switch: "ON"
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System voltage
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Ignition switch: "START"
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Approximately 0 V
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34
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Motor power supply
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Ignition switch: "ON"
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System voltage
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1.Turn the ignition switch to the "LOCK" (OFF) position and disconnect the ABS-ECU connector A-01 before checking resistance and continuity.
2.Check the resistance and continuity between the terminals indicated in the table below.
3.The terminal layout is shown in the illustration.
ABS-ECU terminal No.
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Signal
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Normal condition
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1 to 2
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Wheel speed sensor (rear-right)
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0.9 - 1.3 kΩ
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4 to 5
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Wheel speed sensor (front-left)
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0.9 - 1.3 kΩ
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23 to 24
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Wheel speed sensor (rear-left)
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0.9 - 1.3 kΩ
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26 to 27
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Wheel speed sensor (front-right)
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0.9 - 1.3 kΩ
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11 to body earth
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Earth
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Continuity (Less than 2 Ω)
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33 to body earth
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Earth
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Continuity (Less than 2 Ω)
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