TSRM/MK4 Supra/Repair Manual
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p.191

BE/Body Electrical Systems — Inspection Procedure, page 192

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p.193
Inspection Procedure — MK4 Supra Body Electrical Systems, page 192
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Page text (OCR transcript)
BE–192
BODY ELECTRICAL SYSTEM – CRUISE CONTROL SYSTEM

INSPECTION PROCEDURE

1    Check operation of starter.

C    Check that the starter operates normally and that the engine starts.

OK                              NG    Proceed to engine troubleshooting (See page
                                       EG–381 or EG–487.)

2    Input signal check.

                                P    (1)  See input signal check on page BE–169.
        Shifiting into               (2)  Check the indicator light when shifting into ex–
        except D range                    cept D position.
 ON
                                OK   The indicator light goes off when shifting into except D
 OFF                                  range.

NG                              OK    Proceed to next circuit inspection shown on matrix
                                       chart (See page BE–170).

3    Check voltage between terminal D of ECU connector and body ground.

    ON                          P    Remove ECU with connectors still connected.

                                C    (1)  Turn ignition switch ON.
                                     (2)  Measure voltage between terminal D of ECU
                                          connector and body ground, when shifting into P,
                                          N position and other positions.

    V                           OK
                                     Shift Position              Voltage
              D                      D range                    10 – 14 V
                                     Other ranges               Below 1 V
BE3840
NO8768

NG                              OK    Proceed to next circuit inspection shown on matrix
                                       chart (See page BE–170).

4    Check for open in harness and connector between ECU and ST fuse
     (See page IN–30).

OK                              NG    Repair or replace harness or connector.

Check and replace ECU.