Inspection Procedure 5

Combination meter does network.

Part 1:

Part 2:

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

TECHNICAL DESCRIPTION (COMMENT)
The cause may be malfunction of the power and/or 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. Check combination meter connector C-01 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

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

YES: Go to Step 2.

NO: Repair or replace the damaged components). Refer to Harness Connector Inspection. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the ignition switch (IG1) should be normal.

STEP 2. Check the battery power supply circuit to the combination meter. Measure the voltage at combination meter connector C-01.




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




2. Measure the voltage between terminal 7 and ground.
- The voltage should equal 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-01 (terminal 7) and battery.

NOTE: Also check intermediate connector C-129 and joint connector C-05 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-129 or joint connector C-05 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is 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. Check the ignition switch (IG1) circuit to the combination meter. Measure the voltage at combination meter connector C-01.




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




3. Measure the voltage between terminal 9 and ground.
- The voltage should equal 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-01 (terminal 9) and ignition switch (IG1).

NOTE: Also check junction block connector C-211 and C-214 and joint connector C-23 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-211 or C-214 or joint connector C-23 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is 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 6. Check the ground circuit to the combination meter. Measure the resistance at combination meter connector C-01.




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




2. Measure the resistance value between terminal 1 and ground.
- The resistance should equal 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

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

NO: Go to Step 7.




STEP 7. Check the wiring harness between combination meter connector C-01 (terminals 1 and 2) and ground.

Q: Are the wiring harness between combination meter connector C-01 (terminals 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.