Inspection Procedure 3
When the Selector Lever is Moved to "N" Range, Auto-cruise Control is not Cancelled.Park/neutral Position Switch Circuit Part 1:
Park/neutral Position Switch Circuit Part 2:
CIRCUIT OPERATION
This circuit transmits the "N" or "P" position signal of the park/neutral position switch to the auto-cruise control-ECU. When the park/neutral position switch is at the "N" or "P" position, auto-cruise control-ECU terminal number 13 will receives 0 volt.
TECHNICAL DESCRIPTION (COMMENT)
The cause is probably an open-circuit in the output signal circuit in "N" range.
TROUBLESHOOTING HINTS
- Malfunction of the park/neutral position switch.
- Damaged harness or connector.
- Malfunction of the auto-cruise control-ECU.
DIAGNOSIS
Required Special Tool:
- MB991223: Harness Set
STEP 1. Measure the output circuit voltage at park/neutral position switch connector B-21 (terminal 10) by backprobing.
1. Do not disconnect park/neutral position switch connector B-21.
2. Turn the ignition switch to the "ON" position.
3. Measure the voltage between terminal 10 and ground by backprobing.
- Voltage should measure battery positive voltage. (When select lever is in a position other than "N" range.)
- Voltage should measure 0.5 volts or less. (When select ever is in "N" range.)
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage within specifications?
YES: Check that the malfunction is eliminated. If the malfunction is not eliminated, replace the auto-cruise control-ECU. Then check that the malfunction is eliminated.
NO: Go to Step 2.
STEP 2. Check the park/neutral position switch connector B-21.
Q: Is the connector damaged?
YES: Repair or replace connector. Refer to Harness Connector Inspection. Then check that the malfunction is eliminated.
NO: Go to Step 3.
STEP 3. Check the circuit at the park/neutral position switch.
1. Disconnect the park/neutral position switch connector B-21.
2. Measure the continuity park/neutral position switch connector terminals.
Q: Is the continuity meet the table above?
YES: Go to Step 4.
NO: Replace the park/neutral position switch. Refer to Transaxle. Then check that the malfunction is eliminated.
STEP 4. Measure the output circuit voltage at auto-cruise control-ECU connector C-113 (terminal 13) by backprobing.
1. Do not disconnect auto-cruise control switch connector C-113.
2. Turn the ignition switch to the "ON" position.
3. Measure the voltage between terminal 13 and ground by backprobing.
- Voltage should measure battery positive voltage. (When select lever is in a position other than "N" range.)
- Voltage should measure 0.5 volts or less. (When select ever is in "N" range.)
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage within specifications?
YES: Check that the malfunction is eliminated. If the malfunction is not eliminated, replace the auto-cruise control-ECU. Then check that the malfunction is eliminated.
NO: Go to Step 5.
STEP 5. Check auto-cruise control-ECU connector C-113.
Q: Is the connector damaged?
YES: Repair or replace connector. Refer to Harness Connector Inspection. Then check that the malfunction is eliminated.
NO: Go to Step 6.
STEP 6. Check intermediate connector C-106.
Q: Is the connector damaged?
YES: Repair or replace connector. Refer to Harness Connector Inspection. Then check that the malfunction is eliminated.
NO: Go to Step 7.
STEP 7. Check the harness wire between park/neutral position switch connector B-21 (terminal 10) and auto-cruise control-ECU connector C-113 (terminal 13).
Q: Is any harness wire between park/neutral position switch connector B-21 (terminal 10) and auto-cruise control-ECU connector C-113 (terminal 13) damaged?
YES: Repair the harness wire and then check that the malfunction is eliminated.
NO: Check that the malfunction is eliminated. If the malfunction is not eliminated, replace the auto-cruise control-ECU. Then check that the malfunction is eliminated.