Inspection Procedure 5

INSPECTION PROCEDURE 5: Combination meter does not work.

Part 1:

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 Tool:
- MB991223: Harness Set

STEP 1. Measure at combination meter connector C-04 by backprobing in order to check the battery circuit of power supply system to the combination meter.




1. Measure at combination meter connector C-04 without disconnecting the connector.




2. Measure the voltage between terminal 35 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-04 for damage.

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

YES: Go to Step 3.

NO: Repair or replace the connector. Check to see that all meters operate.










STEP 3. Check the wiring harness between combination meter connector C-04 (terminal 35) and battery.

NOTE: Also check intermediate connector C-116 and joint connector 3. C-02. If intermediate connectors C-116 or joint connector 3. C-02 are damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Are the wiring harness between combination meter connector C-04 (terminal 35) 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-04 by backprobing in order to check the battery circuit of power supply system to the combination meter.




1. Measure at combination meter connector C-04 without disconnecting the connector.
2. Turn the ignition switch to "ON" position.




3. Measure the voltage between terminal 42 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-04 for damage.

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

YES: Go to Step 6.

NO: Repair or replace the connector. Check to see that all meters operate.







STEP 6. Check the wiring harness between combination meter connector C-04 (terminal 42) and ignition switch (IG1).

NOTE: Also check junction block connectors C-203 and C-205. If junction block connectors C-203 or C-205 are damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Are the wiring harness between combination meter connector C-04 (terminal 42) 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-04 by backprobing in order to check the ground circuit to the combination meter.




1. Measure at combination meter connector C-04 without disconnecting the connector.




2. Measure the resistance between terminal 40 and ground.
- The measured value should be 2 ohms or less.
3. Measure the resistance between terminal 41 and ground.
- The measured value should be 2 ohms 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-04 for damage.

Q: Is combination meter connector C-04 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 combination meter connector C-04 (terminal 40 and 41) and ground.

Q: Are the wiring harness between combination meter connector C-04 (terminal 40 and 41) 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.