Code No.P1564: Abnormal voltage at cruise control switch.
OPERATION
- When all switches are OFF: 4.7 - 5.0 volts.
- When the "ON/OFF" switch is ON: 0 - 0.5 volt .
- When the "CANCEL" switch is ON: 1.0 - 1.8 volts.
- When the "COAST/SET" switch is ON: 2.3 - 3.0 volts.
- When the "ACC/RES" switch is ON: 3.5 - 4.2 volts.
DIAGNOSIS CODE SET CONDITIONS
- If the cruise control switch is operated, this diagnosis code will be set when the engine-ECU terminal voltage is different from the standard value.
- Or, this code is set when the "COAST/SET" switch or "ACC/RES" switch is stuck to ON.
PROBABLE CAUSES
- Damaged harness or connector.
- Malfunction of the cruise control switch.
- Malfunction of the clock spring.
- Malfunction of the engine-ECU.
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STEP 1. Check the data list.
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Using M.U.T.-III, check the data list (Refer to  - data list reference table.)
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- Item 136: "ON/OFF" switch.
- Item 137: "CANCEL" switch.
- Item 138: "COAST/SET" switch.
- Item 139: "ACC/RES" switch.
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Q.
Is the check result normal?
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 Go to Step 20.
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 Go to Step 2.
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STEP 2. Measure the terminal voltage at cruise control switch connector D-301.
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(1)Remove the driver’s air bag module [Refer to GROUP 52B - Driver’s, Front Passenger’s Air Bag Module(s) and Clock Spring .]
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(2)Remove the cruise control switch from the steering wheel with the cruise control switch connector connected (Refer to .)
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(3)Connect the negative battery cable that was disconnected when the driver’s air bag module was removed.
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(4)Turn the ignition switch to the "ON" position.
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(5)Do not operate the cruise control switch.
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(6)Measure the terminal voltage between cruise control switch connector D-301 terminal No.4 and earth with cruise control switch connector D-301 connected.
OK: 4.7 - 5.0 V
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(7)Turn the ignition switch to the "LOCK" (OFF) position.
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(8)Install the cruise control switch to the steering wheel (Refer to .)
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Q.
Is diagnosis code No. P1564 set?
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Go to Step 10.
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Go to Step 3.
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STEP 3. Measure the terminal voltage at engine-ECU connector D-215.
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(1)Turn the ignition switch to the "ON" position.
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(2)Do not operate the cruise control switch.
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(3)Do not disconnect the engine-ECU connectors.
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(4)Measure the terminal voltage between engine-ECU connector D-215 terminal No.139 and earth with engine-ECU connector connected.
OK: 4.7 - 5.0 V
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(5)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is the check result normal?
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Go to Step 6.
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Go to Step 4.
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STEP 4. Connector check: D-215 engine-ECU connector.
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Q.
Is the check result normal?
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Go to Step 5.
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Repair or replace the damaged connector, and install the driver’s air bag module [Refer to GROUP 52B - Driver’s, Front Passenger’s Air Bag Module(s) and Clock Spring .] Then go to Step 21
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STEP 5. Check the harness for short circuit to earth between engine-ECU connector D-215 terminal No.139 and cruise control switch connector D-301 terminal No.4.
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(1)Disconnect engine-ECU connector D-215 and measure at the harness connector side.
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(2)Turn the ignition switch to the "LOCK" (OFF) position.
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(3)Measure the continuity between engine-ECU connector D-215 terminal No.139 and earth.
OK: open circuit
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(4)Connect engine-ECU connector D-215.
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Q.
Is the check result normal?
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Install the driver’s air bag module [Refer to GROUP 52B - Driver’s, Front Passenger’s Air Bag Module(s) and Clock Spring .] Then go to Step 19.
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Go to Step 6.
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STEP 6. Connectors check: D-301 cruise control switch connector, D-229 intermediate connector, D-302 and D-305 clock spring connectors.
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Q.
Is the check result normal?
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Go to Step 7.
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Repair or replace the damaged connector, and install the driver’s air bag module [Refer to GROUP 52B - Driver’s, Front Passenger’s Air Bag Module(s) and Clock Spring .] Then go to Step 21
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STEP 7. Check the harness wire between engine-ECU connector D-215 terminal No.139 and cruise control switch connector D-301 terminal No.4.
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Q.
Is the check result normal?
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Go to Step 8.
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Repair or replace the damaged harness wire, and install the driver’s air bag module [Refer to GROUP 52B - Driver’s, Front Passenger’s Air Bag Module(s) and Clock Spring .] Then go to Step 21
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STEP 8. Check the clock spring.
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Refer to GROUP 52B - Driver’s, Front Passenger’s Air Bag Module(s) and Clock Spring Inspection .
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Q.
Is the check result normal?
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Go to Step 9.
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Replace the clock spring and install the driver’s air bag module [Refer to GROUP 52B - Driver’s, Front Passenger’s Air Bag Module(s) and Clock Spring .] Then go to Step 21.
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STEP 9. Check the data list.
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Using M.U.T.-III, check the data list (Refer to - data list reference table.)
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- Item 136: "ON/OFF" switch.
- Item 137: "CANCEL" switch.
- Item 138: "COAST/SET" switch.
- Item 139: "ACC/RES" switch.
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Q.
Is the check result normal?
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It can be assumed that this malfunction is intermittent (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunctions .) Install the driver’s air bag module [Refer to GROUP 52B - Driver’s, Front Passenger’s Air Bag Module(s) and Clock Spring .]
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Return to Step 2.
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STEP 10. Measure the terminal voltage at cruise control switch connector D-301.
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(1)Remove the cruise control switch from the steering wheel with the cruise control switch connector connected (Refer to .)
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(2)Turn the ignition switch to the "ON" position.
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(3)Press the "ON/OFF" switch with cruise control switch connector D-301 connected, and measure the terminal voltage between cruise control switch connector D-301 terminal No.3 and earth.
OK: 0.5 V or less
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(4)Release the "ON/OFF" switch.
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(5)Turn the ignition switch to the "LOCK" (OFF) position.
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(6)Install the cruise control switch to the steering wheel (Refer to .)
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Q.
Is the check result normal?
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Go to Step 17.
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Go to Step 11.
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STEP 11. Measure the terminal voltage at engine-A/T-ECU connector D-215.
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(1)Turn the ignition switch to the "ON" position.
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(2)Do not disconnect the engine-ECU connectors.
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(3)Press the "ON/OFF" switch, and measure the terminal voltage between engine-ECU connector D-215 terminal No.154 and earth with engine-ECU connector connected.
OK: 0.5 V or less
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(4)Release the "ON/OFF" switch.
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(5)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is the check result normal?
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Go to Step 13.
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Go to Step 12.
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STEP 12. Connector check: D-215 engine-ECU connector.
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Q.
Is the check result normal?
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Install the driver’s air bag module [Refer to GROUP 52B - Driver’s, Front Passenger’s Air Bag Module(s) and Clock Spring .] Then go to Step 19.
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Repair or replace the damaged connector, and install the driver’s air bag module [Refer to GROUP 52B - Driver’s, Front Passenger’s Air Bag Module(s) and Clock Spring .] Then go to Step 21
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STEP 13. Connectors check: D-215 engine-ECU connector, D-229 intermediate connector, D-301 cruise control switch connector, D-302 and D-305 clock spring connectors.
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Q.
Is the check result normal?
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Go to Step 14.
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Repair or replace the damaged connector, and install the driver’s air bag module [Refer to GROUP 52B - Driver’s, Front Passenger’s Air Bag Module(s) and Clock Spring .] Then go to Step 21
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STEP 14. Check the harness wire between engine-ECU connector D-215 terminal No.154 and cruise control switch connector D-301 terminal No.3.
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Q.
Is the check result normal?
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Go to Step 15.
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Repair or replace the damaged harness wire, and install the driver’s air bag module [Refer to GROUP 52B - Driver’s, Front Passenger’s Air Bag Module(s) and Clock Spring .] Then go to Step 21
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STEP 15. Check the clock spring.
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Refer to GROUP 52B - Driver’s, Front Passenger’s Air Bag Module(s) and Clock Spring Inspection .
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Q.
Is the check result normal?
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Go to Step 16.
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Replace the clock spring and install the driver’s air bag module [Refer to GROUP 52B - Driver’s, Front Passenger’s Air Bag Module(s) and Clock Spring .] Then go to Step 21.
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STEP 16. Check the data list.
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Using M.U.T.-III, check the data list (Refer to - data list reference table.)
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- Item 136: "ON/OFF" switch.
- Item 137: "CANCEL" switch.
- Item 138: "COAST/SET" switch.
- Item 139: "ACC/RES" switch.
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Q.
Is the check result normal?
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It can be assumed that this malfunction is intermittent (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunctions .) Install the driver’s air bag module [Refer to GROUP 52B - Driver’s, Front Passenger’s Air Bag Module(s) and Clock Spring .]
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Return to Step 2.
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STEP 17. Connector check: D-301 cruise control switch connector.
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Q.
Is the check result normal?
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Go to Step 18.
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Repair or replace the damaged connector, and install the driver’s air bag module [Refer to GROUP 52B - Driver’s, Front Passenger’s Air Bag Module(s) and Clock Spring .] Then go to Step 21
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STEP 18. Check the cruise control switch.
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Refer to .
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Q.
Is the check result normal?
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Install the driver’s air bag module [Refer to GROUP 52B - Driver’s, Front Passenger’s Air Bag Module(s) and Clock Spring .] Then go to Step 19.
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Replace the cruise control switch (Refer to .) Install the driver’s air bag module [Refer to GROUP 52B - Driver’s, Front Passenger’s Air Bag Module(s) and Clock Spring .] Then go to Step 21.
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STEP 19. Check the data list.
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Using M.U.T.-III, check the data list (Refer to - data list reference table.)
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- Item 136: "ON/OFF" switch.
- Item 137: "CANCEL" switch.
- Item 138: "COAST/SET" switch.
- Item 139: "ACC/RES" switch.
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Q.
Is the check result normal?
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Go to Step 20.
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Replace the engine-ECU (Refer to GROUP 13B - Engine-ECU .) Then go to Step 21.
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STEP 20. Read the diagnosis code.
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(1)Disconnect the negative battery terminal, and erase the diagnosis code of the cruise control system.
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(2)Connect the negative battery terminal.
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(3)Turn the ignition switch to the "ON" position, and press the "ON/OFF" switch to turn the cruise control system to ON (turn ON the cruise control indicator lamp.)
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(4)After turning the cruise control system to ON, when 2 minutes or more has elapsed without operating the cruise control switches, read the diagnosis code of the cruise control system (Refer to .)
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Q.
Is diagnosis code No. P1564 set?
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Replace the engine-ECU (Refer to GROUP 13B - Engine-ECU .) Then go to Step 21.
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It can be assumed that this malfunction is intermittent (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunction .)
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STEP 21. Check the data list.
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Using M.U.T.-III, check the data list (Refer to - data list reference table.)
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- Item 136: "ON/OFF" switch.
- Item 137: "CANCEL" switch.
- Item 138: "COAST/SET" switch.
- Item 139: "ACC/RES" switch.
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Q.
Is the check result normal?
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Go to Step 22.
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Return to Step 2.
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STEP 22. Read the diagnosis code.
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(1)Disconnect the negative battery terminal, and erase the diagnosis code of the cruise control system.
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(2)Connect the negative battery terminal.
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(3)Turn the ignition switch to the "ON" position, and press the "ON/OFF" switch to turn the cruise control system to ON (turn ON the cruise control indicator lamp.)
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(4)After turning the cruise control system to ON, when 2 minutes or more has elapsed without operating the cruise control switches, read the diagnosis code of the cruise control system (Refer to .)
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Q.
Is diagnosis code No. P1564 set?
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Return to Step 1.
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The procedure is complete.
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