Procedure 2 - Tachometer Inoperative

Tachometer Circuit:

Connectors:

CIRCUIT OPERATION
- The tachometer power is supplied from the ignition switch circuit.
- For vehicles with 3.0L engine and 3.5L engine, the tachometer detects the ignition signal controlled by the engine control module and indicates the engine rpm.

TECHNICAL DESCRIPTION (COMMENT)
The ignition signal may not be input from the engine, or there may be a malfunction in the power supply or ground circuit.

TROUBLESHOOTING HINTS
- Malfunction of the tachometer
- Damaged harness wire or connector

DIAGNOSIS
STEP 1. Check the input signal from the ignition switch.
1. Remove the combination meter.




2. Measure on the harness side of combination meter connector C-05.
3. Start the engine and let it run at idle.
4. Measure the voltage between terminal number 14 and body ground.

- Voltage should be approximately 5 volts.

If approximately 5 volts, check that the malfunction is eliminated.

If not approximately 5 volts, go to Step 2.




STEP 2. Check harness connector C-05 at the combination meter connector for damage.
If harness connector C-05 is damaged, repair or replace it. Refer to Harness Connector Inspection.

If harness connector C-05 is in good condition, go to Step 3.




STEP 3. Check harness connector C-11 at the joint connector for damage.
If harness connector C-71 is damaged, repair or replace it. Refer to Harness Connector Inspection.

If harness connector C-71 is in good condition, go to Step 4.




STEP 4. Check the harness wires between combination meter connector C-05 and joint connector C-71.
If the harness wires between combination meter connector C-05 and joint connector (4) are damaged, repair them. Check that the malfunction is eliminated.

If the harness wires are in good condition, go to Step 5.









NOTE: After inspecting intermediate connector C-16, inspect the wire. If intermediate connector C-16 is damaged, repair or replace it. Refer to Harness Connector Inspection.

STEP 5. Check the power supply from the ignition switch to the combination meter.
1. Remove the combination meter.
2. Measure at the harness side of combination meter connector C-04.




3. Voltage should be about 12 volts (battery positive voltage).

If about 12 volts, check that the malfunction is eliminated.

If not about 12 volts, go to Step 6




STEP 6. Check harness connector C-04 at combination meter for damage.
If harness connector C-04 is damaged, repair or replace it. Refer to Harness Connector Inspection.

If harness connector C-04 is in good condition, go to Step 7.




STEP 7. Check the harness wires between combination meter connector C-04 and the ignition switch (IG1).
If the harness wires between combination meter connector C-04 and the ignition switch (IG1) are damaged, repair them.Check that the malfunction is eliminated.

If the harness wires are in good condition, go to Step 8.









NOTE: After inspecting junction block connectors D-06, D-08, inspect the wire. If junction block connectors D-06, D-08 are damaged,
repair or replace them. Refer to Harness Connector Inspection.

STEP 8. Check the combination meter ground circuit.
1. Remove the combination meter.
2. Measure at the harness side of combination meter connector C-05.




3. Measure the continuity between terminal number 13 and body ground.
- There should be continuity (0 ohm).

If continuity, check that the malfunction is eliminated.

If no continuity, go to Step 9.




STEP 9. Check the harness wires between combination meter connector C-05 and body ground.
If the harness wires between combination meter connector C-05 and body ground are damaged, repair them. Check that the malfunction is eliminated.

If the harness wires are in good condition, replace the speedometer. Check that the malfunction is eliminated.