Inspection Procedure 35: Clutch Switch (B) System <Vehicles with AS&G system>

OPERATION

The battery voltage is applied to the clutch switch (B) (terminal No. 1) from the ignition switch (terminal No. 2).
The ON/OFF signal is inputted to the engine-ECU (terminal No. 101) from the clutch switch (B) output terminal (terminal No. 6).

FUNCTION

Detect the clutch pedal status, which must be input into the engine ECU. When the clutch pedal is fully depressed, the clutch switch (B) is turned ON. This allows the engine-ECU to detect the clutch pedal is fully depressed.

PROBABLE CAUSES

Failed clutch switch (B)
Open or shorted clutch switch (B) circuit, harness damage, or connector damage
Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list

Refer to Data List Reference Table .

Item 154: Clutch switch (B)

Q. Is the check result normal?

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

	Go to Step 2 .

STEP 2. Connector check: B-28 clutch switch (B) connector

Q. Is the check result normal?

Go to Step 3 .

Repair or replace the connector.

STEP 3. Check clutch switch (B) itself

Check clutch switch (B) itself (Refer to GROUP 21A - Clutch Pedal - Inspection ).

Q. Is the check result normal?

	Go to Step 4 .

	Replace the clutch switch (B).

STEP 4. Perform voltage measurement at B-28 clutch switch (B) connector.

Disconnect connector, and measure at harness side.
Ignition switch: ON
Voltage between terminal No. 1 and earth.

OK: System voltage

Q. Is the check result normal?

Go to Step 6 .

STEP 5. Connector check: B-240 ignition switch connector

Q. Is the check result normal?

Check power supply line for open/short circuit.

Repair or replace the connector.

STEP 6. Connector check: A-09 engine-ECU connector

Q. Is the check result normal?

Go to Step 7 .

Repair or replace the connector.

STEP 7. Perform voltage measurement at A-09 engine-ECU connector.

Disconnect connector, and measure at harness side.
Ignition switch: ON
Voltage between terminal No. 101 and earth.

OK:
System voltage (clutch pedal: fully depressed)
1 V or less (clutch pedal: released)

Q. Is the check result normal?

Go to Step 8 .

Check output line for open/short circuit

STEP 8. Check harness between B-28 (terminal No. 6) clutch switch (B) connector and A-09 (terminal No. 101) engine-ECU connector.

Check output line for damage.

Q. Is the check result normal?

Go to Step 9 .

Repair the damaged harness wire.

STEP 9. Connector check: B-240 ignition switch connector

Q. Is the check result normal?

Go to Step 10 .

Repair or replace the connector.

STEP 10. Check harness between B-240 (terminal No. 2) ignition switch connector and B-28 (terminal No. 1) clutch switch (B) connector.

note

Before checking harness, check intermediate connectors B-210 and B-289, and repair if necessary.

Check power supply line for damage.

Q. Is the check result normal?

Go to Step 11 .

Repair the damaged harness wire.

STEP 11. M.U.T.-III diagnosis code

Reconfirmation of diagnosis code.

Q. Is the diagnosis code set?

	Replace the engine-ECU then perform the variant coding (Refer to GROUP 00 - Precautions Before Service - How to Perform Variant Coding ).

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).