Inspection Procedure O-14
The speed sensor.Signal Is not sent to the ETACS-ECU.Speed Sensor Input Circuit:
Connectors:
CIRCUIT OPERATION
The ETACS-ECU operates various functions according to the input signal from the speed sensor.
TECHNICAL DESCRIPTION (COMMENT)
The speed sensor input signal is used to operate the following device or system:
- Door ajar tone alarm function
- Rolling lock function
- Windshield intermittent wiper
If the signal fails these device or system will not work normally.
TROUBLESHOOTING HINTS
- Malfunction of the speed sensor
- Malfunction of the ETACS-ECU
- Damaged harness wires or connectors
DIAGNOSIS
Required Special Tools:
- MB991223: Test Harness Set
- MB991502: Scan Tool (MUT-II)
- MB991529: Diagnostic Trouble Code Check Harness
STEP 1. Check the speedometer operation.
Q: Does the speedometer work normally?
YES: Go to Step 2.
NO: Solve the problem first. Refer to Combination Meter.
STEP 2. Check the speed sensor connector B-109 and ETACS-ECU connector C-313 for damage.
Q: Are hazard warning light switch connector B-109 and ETACS-ECU connector C-313 in good condition?
YES: Go to Step 3.
NO: Repair or replace them. Refer to Harness Connector Inspection. The speed sensor input signal should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.
STEP 3. Check the harness wires between speed sensor connector B-109 and ETACS-ECU connector C-313.
NOTE: After checking intermediate connectors B-106
Q: Are the harness wire between speed sensor connector B-109 and ETACS-ECU connector C-313 in good condition?
YES: Replace the ETACS-ECU. The speed sensor input signal should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.
NO: Repair it. The speed sensor input signal should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.