Inspection Procedure 5

Combination meter does not Work.

Combination Meter Power Supply Circuit:

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

TECHNICAL DESCRIPTION (COMMENT)
The cause is thought to be malfunction of the power, ground circuitry of the 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-102 in order to check the battery circuit of power supply system to the combination meter.




1. Disconnect combination meter connector C-102, and measure at the wiring harness side.




2. Measure the voltage between terminal 31 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-102 for damage.

Q: Is combination meter connector C-102 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 harnesses between combination meter connector C-102 (terminal 31) and the battery.

NOTE: Also check intermediate connector C-209. If intermediate connectors C-209 are damaged, repair or replace the connector as described in Harness Connector Inspection.




Q: Are the wiring harnesses between combination meter connector C-102 (terminal 31) and the battery in good condition?

YES: There is no action to be taken.
NO: Repair the wiring harness(es). Check to see that all meters operate.

STEP 4. Measure at combination meter connector C-101 in order to check the battery circuit of power supply system to the combination meter.




1. Disconnect combination meter connector C-101, and measure at the wiring harness side.
2. Turn the ignition switch to ON position.




3. Measure the voltage between terminal 12 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-101 for damage.

Q: Is combination meter connector C-101 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 harnesses between combination meter connector C-1O1 (terminal 12) and ignition switch (IG1).

NOTE: Also check junction connectors C-308 and C-311. If junction connectors C-308 or C-311 are damaged, repair or replace the connector as described in Harness Connector Inspection.




Q: Are the wiring harness between combination meter connector C-101 (terminal 12) and ignition switch (IG1) in good condition?

YES: There is no action to be taken.
NO: Repair the wiring harness(es). Check to see that all meters operate.

STEP 7. Measure at combination meter connector C-101 and C-102 in order to check the ground circuit to the combination meter.




1. Disconnect combination meter connector C-101 and C-102, and measure at the wiring harness side.




2. Measure the resistance between combination meter connector C-101 terminal 22 and ground.
- The measured value should be 2 ohms or less.




3. Measure the resistance between combination meter connector C-102 terminal 48 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-101 and C- 102 for damage.

Q: Are combination meter connector C-101 and C-102 in good condition?

YES: Go to Step 9.
NO: Repair or replace the connector(s). Refer to Harness Connector Inspection. Check to see that all meters operate.




STEP 9. Check the wiring harness between combination meter connector C-101(terminal 22), C-102 (terminal 48) and ground.

Q: Is the wiring harness between combination meter connector. C-101 (terminal 22), C-102 (terminal 48) 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.