[54A] CHASSIS ELECTRICAL - - SPEED ALARM <Vehicles for GCC> - SYMPTOM PROCEDURES - INSPECTION PROCEDURE 1: The speedometer does not sound when the vehicle speed is 125 km/h or more.PRINT PAGE / INDEX / PRIOR / NEXT
SYMPTOM PROCEDURES
INSPECTION PROCEDURE 1: The speedometer does not sound when the vehicle speed is 125 km/h or more.
TECHNICAL DESCRIPTION (COMMENT)
The cause is thought to be malfunction of the power, earth circuitry or speed alarm-ECU.
TROUBLESHOOTING HINTS
  • Malfunction of the speed alarm-ECU
  • Damaged wiring harness or connectors
DIAGNOSIS PROCEDURE
STEP 1. Check the speed meter.
Q: IS the check result normal?
YES:  Go to Step 2.
NO:  Diagnose the speedometer.Refer to .
STEP 2. Measure the voltage at speed alarm-ECU connector C-39 in order to check the battery circuit of power supply system to the speed alarm-ECU.
  1. Disconnect the speed alarm-ECU connector C-39 and measure the voltage at speed alarm-ECU connector C-39 component side.
  1. Measure the voltage between terminal 1 and earth.
    2. OK: Battery positive voltage
Q: IS the check result normal?
YES:  Go to Step 5.
NO:  Go to Step 3.
STEP 3. Connector check: Speed alarm-ECU connector C-39.
Q: Is speed alarm-ECU connector C-39 in good condition?
YES:  Go to Step 4.
NO:  Repair or replace the connector. Check to see that all meters operate.
STEP 4. Check the wiring harness between speed alarm-ECU connector C-39 (terminal 1) and ignition switch (IG1).
NOTE: Prior to the wiring harness inspection, check junction connectors C-202 and C-203, and repair if necessary.
Q: Are the wiring harness between speed alarm-ECU connector C-39 (terminal 1) and ignition switch (IG1) in good condition?
YES:  There is no action to be taken.
NO:  Repair or replace the wiring harness. Check to see that all meters operate.
STEP 5. Measure the resistance at speed alarm-ECU connector C-39 to check the earth circuit to the speed alarm-ECU.
  1. Disconnect the speed alarm-ECU connector C-39 and measure the resistance at speed alarm-ECU connector C-39.
  1. Measure the resistance between terminal 8 and earth.
    2. OK: 2 ohms or less
Q: Is the check result normal?
YES:  Go to Step 8.
NO:  Go to Step 6.
STEP 6. Connector check: Speed alarm-ECU connector C-39.
Q: Is speed alarm-ECU connector C-39 in good condition?
YES:  Go to Step 7.
NO:  Repair or replace the connector. Check to see that all meters operate.
STEP 7. Check the wiring harness between speed alarm-ECU connector C-39 (terminal 8) and earth.
Q: Are the wiring harness between speed alarm-ECU connector C-39 (terminal 8) and earth in good condition?
YES:  This procedure is complete.
NO:  Repair or replace the wiring harness. Check to see that all meters operate.
STEP 8. Connector check: Engine-A/T-ECU connector C-136.
Q: Is Engine-A/T-ECU connector C-136 in good condition?
YES:  Go to Step 9.
NO:  Repair or replace the connector. Check to see that all meters operate.
STEP 9. Check the wiring harness between speed alarm-ECU connector C-39 (terminal 4) and Engine-A/T-ECU connector C-136 (terminal 80).
NOTE: Prior to the wiring harness inspection, check junction connectors C-02, intermediate connector C-105, and repair if necessary.
Q: Are the wiring harness between speed alarm-ECU connector C-39 (terminal 4) and Engine-A/T-ECU connector C-136 (terminal 79) in good condition?
YES:  Replace the speed alarm-ECU.
NO:  Repair or replace the wiring harness. Check to see that all meters operate.
[54A] CHASSIS ELECTRICAL - - SPEED ALARM <Vehicles for GCC> - SYMPTOM PROCEDURES - INSPECTION PROCEDURE 1: The speedometer does not sound when the vehicle speed is 125 km/h or more.PRINT PAGE / INDEX / PRIOR / NEXT
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