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
- The vehicle speed sensor may be defective
- The ETACS-ECU may be defective
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tools:
- MB991223: Test Harness Set
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicles communication interface (V.C.I.)
- 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 loose, corroded or damaged terminals, or terminals pushed back in the connector.

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 damaged component(s). 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, C-28, joint connector C-77 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connectors B-36, C-28 or joint connector C-77 are damaged, repair or replace the damaged component(s) 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: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. 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.