Toyota Corolla Cross: Lost Communication with ECM/PCM "A" Missing Message (U010087)

DESCRIPTION

The TCM communicates with the ECM via CAN communication.

If a problem occurs in this communication, the TCM stores this DTC.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

CONFIRMATION DRIVING PATTERN

HINT:

• After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
• When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure.

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1. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
2. Turn the ignition switch off and wait for 3 minutes or more.
3. Turn the ignition switch to ON and turn the GTS on.
4. Wait for 3 seconds or more with the ignition switch to ON. [*1]

   HINT:

   [*1]: Normal judgment procedure.

   The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

5. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
6. Input the DTC: U010087.
7. Check the DTC judgment result.

   GTS Display	Description
   NORMAL	DTC judgment completed System normal
   ABNORMAL	DTC judgment completed System abnormal
   INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
   N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

   HINT:

   • If the judgment result shows NORMAL, the system is normal.
   • If the judgment result shows ABNORMAL, the system has a malfunction.
   • If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

• Perform the universal trip to clear permanent DTCs.

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• Perform registration and/or initialization when parts related to the continuously variable transaxle system are replaced.

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• Check that no DTCs are stored after performing initialization.

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• Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

(a) Disconnect the C80 TCM connector.

(b) Turn the ignition switch to ON.

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

Standard Voltage:

(d) Turn the ignition switch off.

(e) Connect the C80 TCM connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE OF TCM)

OK

(a) Disconnect the A47 ECM connector.

(b) Disconnect the C80 TCM connector.

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

Standard Resistance:

(d) Connect the C80 TCM connector.

(e) Connect the A47 ECM connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - TCM)

OK

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NEXT

for Registration: Click here

for Initialization: Click here

NEXT

(a) Clear the DTCs.

(b) Turn the ignition switch off and wait for at least 30 seconds.

(c) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(d) Enter the following menus:

(e) Read the DTCs.

A

END

B

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NEXT

PERFORM INITIALIZATION

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