P0500

DTC P0500: Vehicle Speed Signal Malfunction

TECHNICAL DESCRIPTION

- The ECM receives the vehicle speed signal from the ASC-ECU by the CAN bus line.

DESCRIPTIONS OF MONITOR METHODS

When the signal not available as the vehicle speed information send from ASC-ECU, a malfunction is determined to have occurred.

MONITOR EXECUTION

Continuous

MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)

- Not applicable
Sensor (The sensor below is determined to be normal)

- Mass airflow sensor

DTC SET CONDITIONS (Entry Conditions and Malfunction Thresholds)

Logic Flow Chart






Check Conditions

- 2 seconds or more have passed since the engine starting sequence was completed.
- Battery positive voltage is between 10 and 16.5 volts.
Judgement Criterion

- Vehicle speed information from ASC-ECU is fail for 2 seconds.

FAIL-SAFE AND BACKUP FUNCTION

- None

OBD-II DRIVE CYCLE PATTERN

None

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are: )

- Wheel speed sensor of ASC system failed.
- ASC-ECU failed.
- ECM failed.

DIAGNOSIS

Required Special Tools:

- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991910: Main Harness A

STEP 1. Using scan tool MB991958, read the diagnostic trouble code (DTC).





CAUTION:
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK"
(OFF) position before connecting or disconnecting scan tool MB991958.

(1)Connect scan tool MB991958 to the data link connector.
(2)Turn the ignition switch to the "ON" position.
(3)Set scan tool MB991958, read the ASC-DTC.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the ASC-DTC set?

YES Active Stability Control System (ASC).

NO Go to Step 2.

STEP 2. Check the speedometer.

Q. Is the indication of speedometer normal?

YES Go to Step 3.
NO Replace the ASC-ECU.
STEP 3. Using scan tool MB991958, read the diagnostic trouble code
(DTC).

(1)Turn the ignition switch to the "ON" position.

(2)After the DTC has been deleted, read the DTC again.

(3)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is DTC P0500 set?

YES Replace the ECM (Refer to, Removal and Installation Removal and Replacement).
NO It can be assumed that this malfunction is intermittent. How to Cope With Intermittent Malfunctions.