Inspection Procedure 1
Speedometer Does Not WorkSpeedometer Circuit:
Connectors:
Connectors C-101, C-104:
CIRCUIT OPERATION
- The ignition switch (IG1) 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)
TROUBLESHOOTING HINTS
- Malfunction of the vehicle speed sensor
- Malfunction of the combination meter (printed-circuit board or speedometer and tachometer)
- Malfunction of the ECM
- Malfunction of the auto-cruise control-ECU
- Damaged harness wires or connectors
DIAGNOSIS
Required Special Tools:
- MB991223: Harness Set
- MB991502: Scan Tool (MUT-II)
CAUTION: To prevent damage to scan tool always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool.
STEP 1. Check the vehicle speed sensor.
1. Connect scan tool MB991502 to the data link connector.
2. Turn the ignition switch to "ON" position.
3. Read the MFI system diagnostic trouble code.
Q: Is MFI system DTC P0500 output?
YES: Go to Step 12.
NO: Go to Step 2.
STEP 2. Check the odometer and trip odometer operation.
Q: Do the odometer and trip odometer work correctly?
YES: Go to Step 9.
NO: Go to Step 3.
STEP 3. 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 6.
NO: Go to Step 4.
STEP 4. Check the combination meter connector C-41 for damage.
Q: Is combination meter connector C-41 in good condition?
YES: Go to Step 5.
NO: Repair or replace it. Refer to Harness Connector Inspection. The speedometer should work normally.
STEP 5. Check the harness wires between combination meter connector C-41 and ignition switch (IG1).
NOTE: After checking junction block connectors C-101 and C-104, check the wires. If junction block connectors C-101 and C-104 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 6. 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 two ohm?
YES: Repair or repair the combination meter (printed-circuit board or speedometer and tachometer). The speedometer should work normally.
NO: Go to Step 7.
STEP 7. Check the combination meter connector C-42 for damage.
Q: Is combination meter connector C-42 in good condition?
YES: Go to Step 8.
NO: Repair or replace it. Refer to Harness Connector Inspection. The speedometer should work normally.
STEP 8. 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 9. Check the combination meter vehicle speed sensor Input signal circuit at the combination meter connector C-42.
1. Disconnect the combination meter connector C-42 and measure at the harness side.
2. Turn the ignition switch to "ON" position.
3. Measure the voltage between terminal 29 and ground.
Q: Is the voltage approximately 5 volts?
YES: Repair or repair the combination meter (printed-circuit board or speedometer and tachometer). The speedometer should work normally.
NO: Go to Step 10.
STEP 10. Check the combination meter connector C-42 for damage.
Q: Is combination meter connector C-42 in good condition?
YES: Go to Step 11.
NO: Repair or replace it. Refer to Harness Connector Inspection. The speedometer should work normally.
STEP 11. Check the harness wires between combination meter connector C-42 and vehicle speed sensor connector B-39.
NOTE: After checking Intermediate connector C-28, B-36
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 12. Check the vehicle speed sensor power supply circuit at the vehicle speedometer 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 15.
NO: Go to Step 13.
STEP 13. Check the vehicle speed sensor connector B-39 for damage.
Q: Is vehicle speed sensor connector B-39 In good condition?
YES: Go to Step 14.
NO: Repair or replace it. Refer to Harness Connector Inspection. The speedometer should work normally.
STEP 14. Check the harness wires between vehicle speed sensor connector B-39 and ignition switch (IG1).
NOTE: After checking junction block connectors C-101 and C-104, joint connector C-78 and intermediate connector C-28, B-36
Q: Are the harness wires between vehicle speed sensor connector 6-39 and Ignition switch (IG1) in good condition?
YES: There is no action to be taken.
NO: Repair them. The speedometer should work normally.
STEP 15. Check the vehicle speed sensor ground circuit at the vehicle speed sensor connector B-39.
1. Disconnect the vehicle speed sensor connector B-39.
2. Measure the resistance between terminal 2 and ground.
Q: Is the resistance less than two ohm?
YES: Go to Step 18.
NO: Go to Step 16.
STEP 16. Check the vehicle speed sensor connector B-49 for damage.
Q: Is vehicle speed connector B-39 in good condition?
YES: Go to Step 17.
NO: Repair or replace it. Refer to Harness Connector Inspection. The speedometer should work normally.
STEP 17. Check the harness wire between vehicle speed sensor connector B-39 and ground.
NOTE: After checking intermediate connector B-36
Q: Is the harness wire between vehicle speed sensor connector B-39 and ground in good condition?
YES: There is no action to be taken.
NO: Repair it. The speedometer should work normally.
STEP 18. Check the vehicle speed sensor signal circuit at the vehicle speed sensor connector B-39.
1. Disconnect the vehicle speed sensor connector B-39.
2. Turn the ignition switch to "ON"
3. Measure the voltage between terminal 3 and ground.
Q: Is the voltage approximately 9 volts or more?
More than approximately 9 volts: Replace the vehicle speed sensor. The speedometer should work normally.
Approximately 9 volts: Go to Step 19.
STEP 19. Check the vehicle speed sensor connector B-39, multi-center display connector C-09, auto-cruise control-ECU connector C-20
Q: Are vehicle speed sensor connector B-39, multi-center display connector C-09, auto-cruise control-ECU connector C-20
YES: Go to Step 20.
NO: Repair or replace them. Refer to Harness Connector Inspection. The speedometer should work normally.
STEP 20. Check the harness wires from vehicle speed sensor connector B-39, multi-center display connector C-09, auto-cruise control-ECU connector C-20
NOTE: After checking joint connector C-77 and intermediate connector C-28, check the wires. If joint connector C-77 and intermediate connector C-28 are damaged, repair or replace them. Refer to Harness Connector Inspection.
Q: Are the harness wires from vehicle speed sensor connector B-39, multi-center display connector C-09, auto-cruise control-ECU connector C-20
YES: Go to Step 21.
NO: Repair them. The speedometer should work normally.
STEP 21. Check each equipment Disconnect multi-center display connector C-09, auto-cruise control-ECU connector C-20
CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
1. Connect scan tool to the data link connector.
2. Turn the ignition switch to "ON" position.
3. Read the MFI system diagnostic trouble code.
Q: Does MFI system DTC P0500 reset when one of auto-cruise control-ECU or combination meter, ECM
YES: Go to Step 22.
NO: Replace the auto-cruise control-ECU, combination meter or ECM
STEP 22. Recheck for malfunction.
Q: Is a malfunction eliminated?
YES: This diagnosis is complete. (If no malfunctions are not found in all steps, an intermittent malfunction is suspected. Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction)
NO: Replace the speedometer.