ECD SYSTEM, Diagnostic DTC:P0704

DTC Code DTC Name
P0704 Clutch Switch Input Circuit Malfunction

DESCRIPTION

The exhaust retarder switch assembly is mounted on the clutch pedal. The switch is turned off when the clutch pedal is depressed, and transmits a signal to the ECM.

P0704
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Accelerate and decelerate the vehicle while keeping the vehicle speed within the range of 0 km/h (0 mph) to 80 km/h (50 mph).

No exhaust retarder switch assembly signals sent to ECM despite gears being shifted.

(1 trip detection logic)

  • Open in exhaust retarder switch assembly circuit

  • Exhaust retarder switch assembly

  • ECM

Tech Tips

If the vehicle is driven with the foot of the driver resting on the clutch pedal, this DTC may be stored.

WIRING DIAGRAM

A01CIK5E02

INSPECTION PROCEDURE

Note

When replacing the ECM, the new ECM needs registration Click here and initialization Click here.

Tech Tips

When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the intelligent tester. Then after installing the new ECM, perform all of the initializations and registrations using the "Learning Values Write" function and following the instructions shown on the tester display.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (CLUTCH SWITCH)


    1. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the tester on.

    5. Enter the following menus: Powertrain / Engine and ECT / Data List / Clutch Switch.

    6. Read the value.

      OK
      Clutch Pedal Display
      Released OFF
      Depressed ON

    NG

    INSPECT EXHAUST RETARDER SWITCH ASSEMBLY Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  2. INSPECT EXHAUST RETARDER SWITCH ASSEMBLY


    1. Inspect the exhaust retarder switch assembly Click here.


    NG

    REPLACE EXHAUST RETARDER SWITCH ASSEMBLY Click here

    OK

  3. CHECK ECM (CLSW VOLTAGE)


    1. Turn the ignition switch to ON.

    2. A01CHEOE68
      Text in Illustration
      *a

      Component with harness connected

      (ECM)

      Measure the voltage according to the value(s) in the table below.

      Standard Volt
      Tester Connection Condition Specified Condition
      E39-21 (CLSW) - E38-1 (E1) Clutch pedal released 18 to 27 V
      Clutch pedal depressed 0 to 2 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here