CHECK AT ENGINE-ECU TERMINAL



 1.Connect a needle-nosed wire probe to a voltmeter probe.
2.Insert the needle-nosed wire probe into each of the engine-ECU connector terminals from the wire side, and measure the voltage while referring to the check chart.
note
  1. Make the voltage measurement with the engine-ECU connector connected.
  2. You may find it convenient to pull out the engine-ECU to make it easier to reach the connector terminals.
  3. The checks can be carried out off the order given in the chart.
caution Short-circuiting the positive (+) probe between a connector terminal and earth could damage the vehicle wiring, the sensor, engine-ECU or all of them. Be careful to prevent this!
3.If voltmeter shows any division from standard value, check the corresponding switch, sensor, actuator and related electrical wiring, then repair or replace.
4.After repair or replacement, recheck with the voltmeter to confirm that the repair has corrected the problem.


Terminal No.
 Terminal code
 Check item
 Check condition
 Normal condition
94
 CNTS
 Cruise control switches power supply
 Ignition switch: "ON"
 All switches: Released.
 4.7 - 5.0 V
Speed limiter ON/OFF switch: Pressed
 0 - 0.5 V
Cruise control ON/OFF switch: Pressed.
 0.9 - 1.7 V
CANCEL switch: Pressed.
 1.9 - 2.7 V
SET - switch: Pressed.
 2.9 - 3.6 V
RES + switch: Pressed.
 3.8 - 4.5 V
121
 BRK
 Stop lamp switch (brake switch)
 Ignition switch: "ON"
 Depress the brake pedal.
 System voltage
Release the brake pedal.
 1V or less
128
 CLT1
 Clutch switch
Ignition switch: "ON"
 Release the clutch pedal.
 1 V or less
Depress the clutch pedal.
 10 V or more