Inspection Procedure 2: Speedometer does not Work (Other Meters Work).


















COMMENTS ON TROUBLE SYMPTOM
If only the speedometer does not operate, the engine ECU system, the combination meter, the wiring harness or its connector may be defective. Furthermore, incorrect level of fuel is shown on the gauge, because the display unit can not learn the fuel gauge.

PROBABLE CAUSES

  • Damaged harness wires and connectors
  • Malfunction of vehicle speed sensor
  • Malfunction of combination meter

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-16 vehicle speed sensor connector.

Q. Is C-16 vehicle speed sensor connector in good condition?
Go to Step 2.
Repair or replace the damage component(s).

STEP 2. Check the vehicle speed sensor.
Check the vehicle speed sensor (Refer to ).

Q. Is the check result normal?
Go to Step 3.
Replace the vehicle speed sensor.

STEP 3. Resistance measurement at C-16 vehicle speed sensor connector.
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the resistance between C-16 vehicle speed sensor connector terminal No.2 and body earth
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?
Go to Step 5.
Go to Step 4.

STEP 4. Check the wiring harness between C-16 vehicle speed sensor connector terminal No.2 and body earth.

  • Check the earth wires for open circuit.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Repair the wiring harness.

STEP 5. Voltage measurement at C-16 vehicle speed sensor connector.
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Turn the ignition switch to the ON position.
(3)Measure the voltage between terminal 1 and body earth
OK: System voltage

Q. Is the check result normal?
Go to Step 7.
Go to Step 6.

STEP 6. Check the wiring harness between C-16 vehicle speed sensor connector terminal No.1 and the ignition switch (IG1).
note Prior to the wiring harness inspection, check junction block connectors D-403, D-405 and intermediate connector D-228, and repair if necessary.

  • Check the power supply line to the ignition switch (IG1) for open circuit.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Repair the wiring harness.

STEP 7. Connector check: D-04 combination meter connector

Q. Is the check result normal?
Go to Step 8.
Repair the defective connector.

STEP 8. Check the wiring harness between D-04 combination meter connector terminal No.15 and C-16 vehicle speed sensor connector terminal No.3.
note Prior to the wiring harness inspection, check intermediate connector D-228, and repair if necessary.

  • Check the input line for open circuit.

Q. Is the check result normal?
Go to Step 9.
Repair the wiring harness.

STEP 9. Retest the system.

Q. Is the speedometer normal?
The procedure is complete. (If no malfunctions are found in all steps, an intermittent malfunction is suspected. Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace the combination meter assembly.