Part 1

Speedometer does not Work

Speedometer Circuit:

Connectors Part 1:

Connectors Part 2:

CIRCUIT OPERATION
- The ignition switch (IG1) circuit is the power source for the speedometer and vehicle speed sensor or output shaft speed sensor .
- The vehicle speed sensor or output shaft speed sensor are installed on the transaxle. Four pulses are generated with one turn of the vehicle speed sensor shaft. In case of M/T, these pulse signals are sent into the speedometer and in case of A/T, these pulse signals are sent into the PCM and 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) or powertrain control module (PCM) , auto-cruise control-ECU.

TROUBLESHOOTING HINTS
- Malfunction of the vehicle speed sensor or output shaft speed sensor
- Malfunction of the combination meter (printed- circuit board or speedometer and tachometer)
- Malfunction of the ECM or PCM
- Malfunction of the auto-cruise control-ECU
- Damaged harness wires or connectors

DIAGNOSIS

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

STEP 1. Check the speedometer.

CAUTION: To prevent damage to scan tool always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool.

1. Connect scan tool MB991502 to the data link connector.
2. Use scan tool MB991502 to enter a simulated vehicle speed.

Q: Does the speedometer correspond with the simulated vehicle speed?

YES: Go to step 2.

NO: Go to Step 4.

STEP 2. Check the vehicle speed sensor
1. Turn the ignition switch to "ON" position.
2. Read the MFI system diagnostic trouble code.

Q: Is MFI system DTC P0500 output?

YES:
- For M/T, Go to Step 13.
- For A/T, Go to Step 22.

NO: Go to Step 3.

STEP 3. Check the odometer and trip odometer operation.

Q: Do the odometer and trip odometer work correctly?

YES: Go to step 10.

NO: Go to Step 4.

STEP 4. Check the combination meter power supply circuit at the combination meter connector C-41.
1. Disconnect the combination meter connector C-41.
2. Turn the ignition switch to "ON" position.

3. Measure the voltage between terminal 52 and ground.

Q: Is the voltage 12 volts (battery positive voltage) between terminal 52 and ground?

YES: Go to step 7.

NO: Go to Step 5.

STEP 5. Check the combination meter connector C-41 for damage.

Q: Is combination meter connector C-41 in good condition?

YES: Go to step 6.

NO: Repair or replace it. Refer to Harness Connector Inspection. The speedometer should work normally.

STEP 6. Check the harness wires between combination meter connector C-41 and ignition switch (IG1).

NOTE: After checking junction block connectors C-111 and C-108, check the wires. If junction block connectors C-111 and C-108 are damaged, repair or replace them. Refer to Harness Connector Inspection.

Q: Is the harness wires between combination meter connector C-41 and ignition switch (IG1) in good condition?

YES: There is no action to be taken.

NO: Repair them. The speedometer should work normally.

STEP 7. Check the combination meter (speedometer) ground circuit at the combination meter connector C-42.
1. Disconnect the combination meter connector C-42.

2. Measure the resistance between terminal 34 and ground.

Q: Is the resistance value less than 2 ohm?

YES: Repair or replace the combination meter (printed circuit board or speedometer and tachometer). The speedometer should work normally.

NO: Go to Step 8.

STEP 8. Check the combination meter connector C-42 for damage.

Q: Is combination meter connector C-42 in good condition?

YES:Go to Step 9.

NO: Repair or replace it. Refer to Harness Connector Inspection. The speedometer should work normally.

STEP 9. Check the harness wire between combination meter connector C-42 and ground.

Q: Is the harness wire between combination meter connector C-42 and ground in good condition?

YES: There is no action to be taken.

NO: Repair it. The speedometer should work normally.

STEP 10. Check the combination meter vehicle speed sensor input signal circuit at the combination meter connector C-42.
1. Disconnect the vehicle speed sensor connector B-39 .
2. Disconnect the combination meter connector C-42.
3. Turn the ignition switch to "ON" position.

4. Measure the voltage between terminal 30 and ground.

Q: Is the voltage approximately 5 volts?

YES: Repair or replace the combination meter (printed - circuit board or speedometer and tachometer). The speedometer should work normally.

NO: Go to Step 11.

STEP 11. Check the combination meter connector C-42 for damage.

Q: Is combination meter connector C-42 in good condition?

YES: For M/T go to Step 12. For A/T go to Step 22.

NO: Repair or replace it. Refer to Harness Connector Inspection. The speedometer should work normally.

STEP 12. Check the harness wires between combination meter connector C-42 and vehicle speed sensor connector B-39 (M/T>.

NOTE: After checking intermediate connector B-36 , C-28, and joint connector C-77, check the wires. If intermediate connector C-28 and joint connector C-77 are damaged, repair or replace them. Refer to Harness Connector Inspection.

Q: Are the harness wires between combination meter connector C-42 and vehicle speed sensor connector B-39 in good condition?

YES: There is no action to be taken.

NO: Repair them. The speedometer should work normally.

STEP 13. Check the vehicle speed sensor power supply circuit at the vehicle speed meter connector B-39 .
1. Disconnect the vehicle speed sensor connector B-39
2. Turn the ignition switch to "ON" position.
3. Measure the voltage between terminal 1 and ground.

Q: Is the voltage approximately 12 volts (battery positive voltage)?

YES: Go to Step 16.

NO: Go to Step 14.

STEP 14. Check the vehicle speed sensor connector B-39 damage.

Q: Is vehicle speed sensor connector B-38 in good condition?

YES: Go to Step 15.

NO: Repair or replace it. Refer to Harness Connector Inspection. The speedometer should work normally.