Inspection Procedure 6

INSPECTION PROCEDURE 6: Combination meter does not work.

Combination Meter Power Supply Circuit Part 1:

Combination Meter Power Supply Circuit Part 2:

CIRCUIT OPERATION
The combination meter is powered by the ignition switch (IG1) and battery.

TECHNICAL DESCRIPTION (COMMENT)
The cause is thought to be malfunction of the power, ground circuitry or combination meter.

TROUBLESHOOTING HINTS
- Malfunction of the combination meter (printed-circuit board or speedometer and tachometer)
- Damaged wiring harness or connectors

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set

STEP 1. Measure at combination meter connector C-01 in order to check the battery circuit of power supply system to the combination meter.




1. Disconnect combination meter connector C-01, and measure at the wiring harness side.




2. Measure the voltage between terminal 7 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).

Q:Does the measured voltage correspond with this range?

YES: Go to Step 4.

NO: Go to Step 2.




STEP 2. Check combination meter connector C-01 for damage.

Q:Is combination meter connector C-01 in good condition?

YES: Go to Step 3.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check to see that all meters operate.










STEP 3. Check the wiring harness between combination meter connector C-01 (terminal 7) and battery.

NOTE: Also check intermediate connector C-129 and joint connector (1) C-05. If intermediate connectors C-129 or joint connector (1) C-05 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q:Are the wiring harness between combination meter connector C-01 (terminal 7) and battery in good condition?

YES: There is no action to be taken.

NO: Repair the wiring harness. Check to see that all meters operate.

STEP 4. Measure at combination meter connector C-01 in order to check the battery circuit of power supply system to the combination meter.




1. Disconnect combination meter connector C-01, and measure at the wiring harness side.
2. Turn the ignition switch to "ON" position.




3. Measure the voltage between terminal 9 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).

Q:Does the measured voltage correspond with this range?

YES: Go to Step 7.

NO: Go to Step 5.




STEP 5. Check combination meter connector C-01 for damage.

Q:Is combination meter connector C-01 in good condition?

YES: Go to Step 6.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check to see that all meters operate.










STEP 6. Check the wiring harness between combination meter connector C-01 (terminal 9) and ignition switch (IG1).

NOTE: Also check junction block connectors C-211, C-214 and joint connector (5) C-21. If junction block connectors C-211, C-214 or joint connector (5) C-21 are damaged, repair or replace the connector as described in Harness Connector Inspection.

Q:Are the wiring harness between combination meter connector C-01 (terminal 9) and ignition switch (IG1) in good condition?

YES: There is no action to be taken.

NO: Repair the wiring harness. Check to see that all meters operate.

STEP 7. Measure at combination meter connector C-01 in order to check the ground circuit to the combination meter.




1. Disconnect combination meter connector C-01, and measure at the wiring harness side.




2. Measure the resistance between terminal 1 and ground.
- The measured value should be 2 ohm or less.
3. Measure the resistance between terminal 2 and ground.
- The measured value should be 2 ohm or less.

Q:Does the measured voltage correspond with this range?

YES: Repair the combination meter. Check to see that all meters operate.

NO: Go to Step 8.




STEP 8. Check combination meter connector C-01 for damage.

Q:Is combination meter connector C-01 in good condition?

YES: Go to Step 9.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check to see that all meters operate.




STEP 9. Check the wiring harness between combination meter connector C-01 (terminal 1 and 2) and ground.

Q:Are the wiring harness between combination meter connector C-01 (terminal 1 and 2) and ground in good condition?

YES: There is no action to be taken.

NO: Repair the wiring harness. Check to see that all meters operate.