1. Speedometer Does Not Work

CIRCUIT OPERATION
- The ignition switch circuit is the power source for the speedometer and vehicle speed sensor.
- The vehicle speed sensor is installed on the transaxle. Four pulses are generated with one turn of the vehicle speed sensor shaft. These pulse signals are sent into the speedometer. The speedometer calculates the pulse signals, and operates the indicator. At the same time, the travel distance is calculated.

TECHNICAL DESCRIPTION (COMMENT)
The cause may be a faulty vehicle speed sensor circuit system or a faulty speedometer. Vehicle speed sensor is also used by the engine control module (ECM) and transaxle control module (TCM).

TROUBLESHOOTING HINTS
- Malfunction of the vehicle speed sensor
- Malfunction of the speedometer
- Damaged harness wires or connectors

DIAGNOSIS
Required Special Tools:
MB991223: Harness Set
MB991502: Scan Tool (MUT-II)

CAUTION: To prevent damage to scan tool MB991502, make sure that the ignition switch is "OFF" before connecting or disconnecting the scan tool.




STEP 1. Is DTC 24 output?
1. Connect Scan Tool MB991502 to the data link connector.
2. Read the MFI diagnostic trouble code.
If DTC 24 is displayed, go to Step 2.
If DTC 24 is not displayed, go to Step 10.




STEP 2. Check the vehicle speed sensor
1. Remove the vehicle speed sensor. Connect a resistor (3 - 10 K ohms) as shown in the illustration.
2. Turn the shaft of the vehicle speed sensor and check that there is voltage between terminals 2 and 3 (one turn = four pulse).
If there is voltage, go to Step 3.
If there is no voltage, replace the vehicle speed sensor.




STEP 3. Check the vehicle speed sensor power source circuit.
1. Disconnect the vehicle speed sensor connector (C-35 or C-36 ) and measure voltage at the harness side.
2. Turn the ignition switch to "ON" position.
3. Measure voltage between terminal number 1 and ground.
- Voltage should be approximately 12 volts (battery positive voltage).
If battery voltage is present, check that the malfunction is eliminated.
If no battery voltage, go to Step 4.

STEP 4. Check vehicle speed sensor connector C-35 or C-36 for damage.
It harness connector C-35 or C-36 is damaged, repair or replace it.
Refer to Harness Connector Inspection. If harness connector C-35 or C-36 is in good condition, go to Step 5.

STEP 5. Check the harness wires between the ignition switch and vehicles speed sensor connector C-35 or C-36 .
If the harness wires between the ignition switch and vehicle speed sensor connector C-35 or C-36 are damaged, replace them. Check that the malfunction is eliminated.
If the harness Wires are in good condition, go to Step 6.

NOTE: After inspecting intermediate connector C-17, junction block connectors C-73 and C-74, inspect the wires. If intermediate connector C-17, junction block connectors C-73 and C-74 are damaged, repair or replace them. Refer to Harness Connector Inspection.

STEP 6. Check the input signal from the vehicle speed sensor
1. Disconnect the vehicle speed sensor connector (C-35 or C-36) and measure voltage at the harness side.
2. Turn the ignition switch to "ON" position.
3. Measure voltage between terminal number 3 and ground.
- Voltage should be approximately 4.5 volts.
If approximately 4.5 volts, check that the malfunction is eliminated.
If not approximately 4.5 volts, go to Step 7.

STEP 7. Check the harness wires between combination meter connector C-30 and vehicle speed sensor connector C-35 or C-36 .
If the harness wires between combination meter connector C-30 and vehicle speed sensor connector C-35 or C-36 are damaged, replace them. Check that the malfunction is eliminated.
If the harness wires are in good condition, go to Step 8.

NOTE: After inspecting intermediate connector C-17 and jumper connector C-56, inspect the wires. If intermediate connector C-17 and jumper connector C-56 are damaged, repair or replace them. Refer to Harness Connector Inspection.

STEP 8. Check the vehicle speed sensor ground circuit.
1. Disconnect vehicle speed sensor connector C-35 or C-36 and measure at the harness side.
2. Measure continuity between terminal number 2 and body ground.
- There should be continuity (0 ohm).
If there is continuity, check that the malfunction is eliminated. If there is no continuity, repair the harness wires.

STEP 9. Check the harness wires between vehicle speed sensor connector C-35 or C-36 and body ground.
If the harness wires between vehicle speed sensor connector C-35 or C-36 and body ground are damaged, repair them. Check that the malfunction is eliminated.
If the harness wires are in good condition, go to Step 10.

STEP 10. Check the power supply circuit from the battery to the combination meter.
1. Remove the combination meter.
2. Measure at the harness side of combination meter connector C-30.
3. Measure voltage between terminal number 1 and ground.
- Voltage should be approximately 12 volts (battery positive voltages).
If approximately 12 volts, go to Step 13.
If not approximately 12 volts, go to Step 11.

STEP 11. Check harness connector C-30 at the combination connector for damage.
If harness connector C-30 is damaged, repair or replace it.
Refer to Harness Connector Inspection. If harness connector C-30 is in good condition, go to Step 12.

STEP 12. Check the harness wires between combination meter connector C-30 and battery.
If the harness wires between combination meter connector C-30 and the battery are damaged, repair them.
Check that the malfunction is eliminated.
If the harness wires are in good condition, go to Step 13.

NOTE: After inspecting intermediate connector C-66, junction block connectors C-84, C-78 and joint connector C-57, inspect the wires. If intermediate connector C-66, junction block connectors C-84, C-78 and joint connector C-57 are damaged, repair or replace them. Refer to Harness Connector Inspection.

STEP 13. 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-29.
3. Measure voltage between C-29 number 29 and ground.
- Voltage should be approximately 12 volts (battery positive voltage).
If approximately 12 volts, check that the malfunction is eliminated.
If not approximately 12 volts, go to Step 14.

STEP 14. Check harness connector C-29 at the combination meter for damage.
If harness connector C-29 is damaged, repair or replace it.
Refer to Harness Connector Inspection. If harness connector C-29 is in good condition, check that the malfunction is eliminated.

STEP 15. Check the harness wires between combination meter connector C-29 and ignition switch (IG1).
If the harness wires between combination meter connector C-29 and ignition switch (IG1) are damaged, repair them.
Check that the malfunction is eliminated.
If the harness wires are in good condition, go to Step 16.

NOTE: After inspecting junction block connectors C-73 and C-78, inspect the wires. If junction block connectors C-73 and C-78 are damaged, repair or replace them. Refer to Harness Connector Inspection.

STEP 16. Check the combination meter ground circuit.
1. Remove the combination meter.
2. Measure at the harness side of combination meter connector C-29.
3. Measure continuity between C-29 number 30 and body ground.
- There should be continuity (0 ohm).
If there is continuity, check for damage to the connector or wiring harness. Repair or replace as necessary. Then verify the malfunction is eliminated.
If there is no continuity, go to Step 17.

STEP 17. Check the harness wires between combination meter connector C-29 and body ground.
If the harness wires between combination meter connector C-29 and ignition switch (IG1) are damaged, repair them.
Then go to Step 18.
If the harness wires are in good condition, replace the speedometer. Check that the malfunction is eliminated.

STEP 18. Check symptoms.
Confirm that the speedometer needle works normally.