Inspection Procedure P-11

ETACS-ECU does not Receive a Signal from the Vehicle Speed Sensor.

Vehicle Speed Sensor Input Circuit Part 1:

Vehicle Speed Sensor Input Circuit Part 2:

CIRCUIT OPERATION
The ETACS-ECU controls the windshield intermittent wiper interval according to the vehicle speed sensor signal.

TECHNICAL DESCRIPTION (COMMENT)
If the signal is not normal, the wiper interval, which is described in "CIRCUIT OPERATION", will not be changed correctly. If the signal is not normal, the vehicle speed sensor or the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS
- Malfunction of the vehicle speed sensor
- Malfunction of the ETACS-ECU
- Damaged harness wipes or connectors

DIAGNOSIS

Required Special Tools:
- MB991223: Test Harness Set
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicles communication interface
- MB991827: MUT-III USB cable
- MB991911: MUT-III Main harness B

STEP 1. Check that the combination meter (speedometer) works normally.

Q: Does the combination meter (speedometer) work normally?

YES: Go to Step 2.

NO: Refer to Inspection Procedure O-8 "ETACS-ECU does not receive a signal from the windshield mist switch."













STEP 2. Check ETACS-ECU connector C-118 and vehicle speed sensor connector B-39 for damage.

Q: Are ETACS-ECU connector C-118 and vehicles speed sensor connector B-39 in good condition?

YES: Go to Step 3.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. If the wiper interval can be adjusted normally, it indicates that the windshield intermittent wiper interval adjusting knob should send a signal to the ECU.




























STEP 3. Check the wiring harness between ETACS-ECU connector C-118 (terminal 63) and vehicle speed sensor connector B-39 (terminal 3).

NOTE: Also check intermediate connectors B-36 and C-28 and joint connector C-77. If intermediate connectors B-36 and C-28 or joint connector C-77 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between ETACS-ECU connector C-118 (terminal 63) and vehicle speed sensor connector B-39 (terminal 3) in good condition?

YES: Replace the ETACS-ECU. If the wiper interval can be adjusted normally, it indicates that the windshield intermittent wiper interval adjusting knob should send a signal to the ECU.

NO: Repair the wiring harness. If the wiper interval can be adjusted normally, it indicates that the windshield intermittent wiper interval adjusting knob should send a signal to the ECU.