[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. Disconnect the speed alarm-ECU connector C-39 and measure the voltage at speed alarm-ECU connector C-39 component side. Measure the voltage between terminal 1 and earth. 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. Disconnect the speed alarm-ECU connector C-39 and measure the resistance at speed alarm-ECU connector C-39. Measure the resistance between terminal 8 and earth. 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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