DTC 11

Auto-crusie Vaccum Pump Drive System Circuit:

Connector C-20:

CIRCUIT OPERATION
This circuit activates the vacuum pump used to accelerate/decelerate, set, and cancel the vehicle speed.
The auto-cruise control-ECU controls the control valve, release valve, and motor by turning the transistor in the ECU on and off.

DTC SET CONDITIONS
Any drive signal for the release valve, control valve or motor is not input to the auto-cruise control-ECU.

TROUBLESHOOTING HINTS
The most likely causes for this code to be set are:
- Malfunction of the auto-cruise vacuum pump.
- Damaged harness and connector.
- Malfunction of the auto-cruise control-ECU.

DIAGNOSIS




STEP 1. Check the auto-cruise vacuum pump.
1. Disconnect the vacuum hose from the auto-cruise vacuum pump and connect a vacuum gauge to the vacuum pump.
2. Disconnect the vacuum pump connector.
3. Check the auto-cruise vacuum pump and valves according to the following procedure:
1. Connect the positive battery terminal to auto-cruise vacuum pump connector terminal 1, and the negative battery terminal to terminals 2, 3, and 4. The vacuum gauge should read 27 kPa (8.0 in Hg) or more.
2. The vacuum should be maintained when terminal 4 is disconnected from the negative battery terminal while terminals 1, 2, and 3 remain connected. Then the vacuum gauge should read 0 kPa (0 in Hg) when terminal 2 is disconnected from the negative battery terminal while terminals 1, and 3 remain connected.
3. The vacuum should be maintained when terminal 4 is disconnected from the negative battery terminal while terminals 1, 2, and 3 remain connected. Then the vacuum gauge should read 0 kPa (0 in Hg) when terminal 3 is disconnected from the negative battery terminal while terminals 1, and 2 remain connected.

If all of the above values are satisfied, go to Step 2.
If any of the above values are not satisfied, replace the auto-cruise vacuum pump. Check that diagnostic trouble code 11 is not output.







STEP 2. Check harness connectors C-20 at the auto-cruise control-ECU and A-01 at the auto-cruise control vacuum pump for damage.
If the harness connectors are damaged, repair or replace. Refer to Harness Connector Inspection. Check that diagnostic trouble code 11 is not output.
If the harness connectors are in good condition, go to Step 3.







STEP 3. Check the harness wires between
connectors C-20 at the auto-cruise control-ECU and A-01 at the auto-cruise control vacuum pump.
If any harness wires between auto-cruise control-ECU connector C-20 and auto-cruise vacuum pump connector A-01 are damaged, repair them. Refer to Harness Connector Inspection. Check that diagnostic trouble code 11 is not output.
If the harness wires are in good condition, replace the auto-cruise control-ECU. Check that diagnostic trouble code 11 is not output.






NOTE: After checking intermediate connector C-94, inspect the harness. If intermediate connector C-94 is damaged, repair or replace it. Refer to Harness Connector Inspection. Check that diagnostic trouble code ills not output.