INSPECTION PROCEDURE 5: Combination meter does not work.: 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 component(s). 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.
- Disconnect combination meter connector C-01 and measure the voltage available at the wiring harness side of the connector.
- 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.
- Disconnect combination meter connector C-01 and measure the voltage available at the wiring harness side of the connector.
- Turn the ignition switch to the "ON" position.
- 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.
- Disconnect combination meter connector C-01 and measure the resistance available at the wiring harness side of the connector.
- 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.