Inspection Procedure 2

INSPECTION PROCEDURE 2: Power supply circuit.
INSPECTION PROCEDURE 3: Odometer and trip meter are not displayed.
INSPECTION PROCEDURE 4: No needle meters work.
INSPECTION PROCEDURE 5: When the ignition switch is turned to the ON position, the indicator and warning lights do not illuminate.














CIRCUIT OPERATION

The combination meter is energized by the battery through ignition switch (IG1).

TECHNICAL DESCRIPTION (COMMENT)

If the odometer and trip meter are not displayed or no needle meters work, power supply and ground system to the combination meter, or the combination meter itself may be defective.

POSSIBLE CAUSES

- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
- Malfunction of the combination meter

DIAGNOSIS

Required Special Tools:

- MB991223: Harness set
- MB992006: Extra Fine Probe

STEP 1. Check combination meter connector C-04 for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q. Is combination meter connector C-04 in good condition?

YES Go to Step 2.

NO Repair or replace the component(s). Harness Connector Inspection. The combination meter works normally.

STEP 2. Measure at combination meter connector C-04 in order to power supply circuit to combination meter (battery power supply).





(1)Disconnect combination meter connector C-04, and measure at the wiring harness side.





(2)Measure the voltage between terminal 10 and ground.

- The voltage should measure approximately 12 volts (battery positive voltage).

Q. Is the measured voltage approximately 12 volts (battery positive voltage)?

YES Go to Step 4.

NO Go to Step 3.

STEP 3. Check the wiring harness between combination meter connector C-04 (terminal 10) and the battery.

- Check the power supply line for open circuit and short circuit.





NOTE:
Also check intermediate connector C-24 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-24 is damaged, repair or replace. Harness Connector Inspection.

Q. Is the wiring harness between combination meter connector C-04 (terminal 10) and the battery in good condition?

YES Retest the system.

NO Repair the wiring harness. Check that the combination meter is normally.

STEP 4. Measure the voltage at combination meter connector C-04 in order to power supply circuit to combination meter (IG1 power supply).





(1)Disconnect combination meter connector C-04, and measure at the wiring harness side.
(2)Turn the ignition switch to "ON" position.





(3)Measure the voltage between terminal 11 and ground.

- The voltage should measure approximately 12 volts (battery positive voltage).

Q. Is the measured voltage approximately 12 volts (battery positive voltage)?

YES Go to Step 6.

NO Go to Step 5.

STEP 5. Check the wiring harness between combination meter connector C-04 (terminal 11) and the ignition switch (IG1).

- Check the power supply line for open circuit and short circuit.









NOTE:
Also check joint connector (2) C-01, junction block connector C-202 and C-215 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If inspecting joint connector (2) C-01 or junction block connector C-202 or C-215 is damaged, repair or replace. Harness Connector Inspection.

Q. Is the wiring harness between combination meter connector C-04 (terminal 11) and the ignition switch (IG1) in good condition?

YES Refer to ignition switch diagnosis Malfunction of the Ignition Switch Power Supply System.

NO Repair the wiring harness. Check that the combination meter is normally.

STEP 6. Measure the resistance at combination meter connector C-04 in order to the ground circuit to the combination meter.





(1)Disconnect combination meter connector C-04, and measure at the wiring harness side.





(2)Measure the resistance value between terminal 1 and ground.

- The resistance should be 2 ohms or less.

Q. Is the measured resistance 2 ohms or less?

YES Go to Step 8.

NO Go to Step 7.

STEP 7. Check the wiring harness between combination meter connector C-04 (terminal 1) and ground.

- Check the ground wire for open circuit.





Q. Is the wiring harness between combination meter connector C-04 (terminal 1) and ground in good condition?

YES Retest the system.

NO Repair the wiring harness. Check that the combination meter is normally.

STEP 8. Retest the system.

Q. Is the check result satisfactory?

YES The procedure is complete. (If no malfunctions are found in all steps, an intermittent malfunction is suspected. How to Cope With Intermittent Malfunctions).
NO Replace the combination meter.