Inspection Procedure 1
Speedometer does not work.Speedometer Circuit:
Connectors:
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
- 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-101.
1. Disconnect the combination meter connector C-101.
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-101 for damage.
Q: Is combination meter connector C-101 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-101 and ignition switch (IG1).
NOTE: After checking junction block connectors C-301 and C-308, check the wires. If junction block connectors C-301 and C-308 are damaged, repair or replace them. Refer to Harness Connector Inspection.
Q: Is the harness wires between combination meter connector C-101 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-102.
1. Disconnect the combination meter connector C-102.
2. Measure the resistance between terminal 34 and ground.
Q: Is the resistance value less than 2 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-102 for damage.
Q: Is combination meter connector C-102 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-102 and ground.
Q: Is the harness wire between combination meter connector C-102 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-102.
1. Disconnect the vehicle speed sensor connector B-109.
2. Disconnect the combination meter connector C-102.
3. Turn the ignition switch to "ON" position.
4. 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-102 for damage.
Q: Is combination meter connector C-102 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-102 and vehicle speed sensor connector B-109.
NOTE: After checking intermediate connector B-106
Q: Are the harness wires between combination meter connector C-102 and vehicle speed sensor connector B109 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 speed meter connector 5-109.
1. Disconnect the vehicle speed sensor connector B-109.
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-109 damage.
Q: Is vehicle speed sensor connector B-109 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-109 and ignition switch (IG1).
NOTE: After checking junction block connectors C-301 and C-308, joint connector B-106
Q: Are the harness wires between vehicle speed sensor connector C-08 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-109.
1. Disconnect the vehicle speed sensor connector B-109.
2. Measure the resistance between terminal 2 and ground.
Q: Is the resistance less than 2 ohms?
YES: Go to Step 18.
NO: Go to Step 16.
STEP 16. Check the vehicle speed sensor connector B-109 for damage.
Q: Is vehicle speed connector B-109 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-109 and ground.
Q: Is the harness wire between vehicle speed sensor connector B-109 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-109.
1. Disconnect the vehicle speed sensor connector B-109.
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-109, auto-cruise control-ECU connector C-21, ECM
Q: Are vehicle speed sensor connector B-109, auto-cruise control-ECU connector C-21 ECM
YES:
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-109 to auto-cruise control-ECU connector C-21, ECM
NOTE: After checking joint connector C-140 and intermediate connector C-25, check the wires. If joint connector C-140 and intermediate connector C-25 are damaged, repair or replace them. Refer to Harness Connector Inspection.
Q: Are the harness wires from vehicle speed sensor connector B-109 to auto-cruise control-ECU connector C-21, ECM
YES:
NO: Repair them. The speedometer should work normally.
STEP 21. Check each equipment.
Disconnect auto-cruise control-ECU connector C-21 and combination meter connector C-102 in that order one by one. Then check that MFI system DTC P0500 does not reset under any conditions.
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:
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 Trouble shooting/Inspection Service Points-How to Cope with Intermittent Malfunction.)
NO: Replace the speedometer