Toyota Avalon (XX50): Lost Communication with TCM Missing Message (U010187). Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message (U015587). VC Output Circuit

Lost Communication with TCM Missing Message (U010187)

MONITOR DESCRIPTION

The engine control unit and the transmission control unit are located inside the ECM. The engine control unit intercommunicates with the transmission control via CAN communication.

If there is a problem in this communication, the ECM store this DTC.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

CONFIRMATION DRIVING PATTERN

HINT:

• After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

  Click here

• When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

  Click here

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
5. Turn the engine switch off and wait for at least 30 seconds.
6. Turn the engine switch on (IG).
7. Turn the Techstream on.
8. Wait 5 seconds or more [A].
9. Enter the following menus: Powertrain / Engine / Trouble Codes [B].
10. Read the DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
12. Input the DTC: U010187.
13. Check the DTC judgment result.

    Techstream 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

    HINT:

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system has a malfunction.
    • If the judgment result is INCOMPLETE, perform steps [A] through [B] again.
    • [A] to [B]: Normal judgment procedure.

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

    • When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

CAUTION / NOTICE / HINT

HINT:

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: System Select / Health Check.

(e) Read the DTCs.

HINT:

If any DTCs other than U010187 are output, troubleshoot those DTCs first.

A

REPLACE ECM

B

GO TO DTC CHART

Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message (U015587)

DESCRIPTION

The ECM and combination meter assembly send and receive signals via CAN communication.

If a communication error occurs between the ECM and combination meter assembly, the ECM illuminates the MIL and stores this DTC.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

CONFIRMATION DRIVING PATTERN

HINT:

• After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

  Click here

• When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

  Click here

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
5. Turn the engine switch off and wait for at least 30 seconds.
6. Turn the engine switch on (IG).
7. Turn the Techstream on.
8. Wait 5 seconds or more [A].
9. Enter the following menus: Powertrain / Engine / Trouble Codes [B].
10. Read the DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
12. Input the DTC: U015587.
13. Check the DTC judgment result.

    Techstream 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

    HINT:

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system has a malfunction.
    • If the judgment result is INCOMPLETE, perform steps [A] through [B] again.
    • [A] to [B]: Normal judgment procedure.

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

    • When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

CAUTION / NOTICE / HINT

HINT:

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

(a) Refer to the CAN Communication System.

Click here

NEXT

END

VC Output Circuit

DESCRIPTION

The ECM constantly generates a 5 V power source voltage from the battery voltage supplied to the +B, +B2 (BATT) terminals to operate the microprocessor. The ECM also provides this power to the sensors through the VC output circuit.

When the VC circuit has a short circuit, the microprocessor in the ECM and sensors that are supplied power through the VC circuit are deactivated because power is not supplied from the VC circuit. When the system is in this condition, it will not start.

WIRING DIAGRAM

• For the circuit diagram of the ECM power source refer to the ECM power source circuit.

  Click here

• VC Output Circuit

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Check the communication between the Techstream and ECM.

HINT:

It can be checked using the "Engine" item of the Data List.

B

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

A

(a) Turn the engine switch on (IG).

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

Standard Voltage:

HINT:

• Check the fuse with it installed to the No. 1 engine room relay block and No. 1 junction block assembly.
• If the result is not as specified, since current is not flowing to the +B and +B2 terminals of the ECM, the system may not be started.

NG

GO TO ECM POWER SOURCE CIRCUIT

OK

(a) Disconnect the throttle body with motor assembly connector.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Check the communication between the Techstream and ECM.

HINT:

It can be checked using the "Engine" item of the Data List.

HINT:

Perform "Inspection After Repair" after replacing the throttle body with motor assembly.

Click here

B

REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY

A

(a) Disconnect the accelerator pedal sensor assembly connector.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Check the communication between the Techstream and ECM.

HINT:

It can be checked using the "Engine" item of the Data List.

B

REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY

A

(a) Disconnect the crankshaft position sensor connector.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Check the communication between the Techstream and ECM.

HINT:

It can be checked using the "Engine" item of the Data List.

B

REPLACE CRANKSHAFT POSITION SENSOR

A

(a) Disconnect the VVT sensor (for intake camshaft of bank 1) connector.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Check the communication between the Techstream and ECM.

HINT:

It can be checked using the "Engine" item of the Data List.

B

REPLACE VVT SENSOR (FOR INTAKE CAMSHAFT OF BANK 1)

A

(a) Disconnect the VVT sensor (for intake camshaft of bank 2) connector.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Check the communication between the Techstream and ECM.

HINT:

It can be checked using the "Engine" item of the Data List.

B

REPLACE VVT SENSOR (FOR INTAKE CAMSHAFT OF BANK 2)

A

(a) Disconnect the VVT sensor (for exhaust camshaft of bank 1) connector.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Check the communication between the Techstream and ECM.

HINT:

It can be checked using the "Engine" item of the Data List.

B

REPLACE VVT SENSOR (FOR EXHAUST CAMSHAFT OF BANK 1)

A

(a) Disconnect the VVT sensor (for exhaust camshaft of bank 2) connector.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Check the communication between the Techstream and ECM.

HINT:

It can be checked using the "Engine" item of the Data List.

B

REPLACE VVT SENSOR (FOR EXHAUST CAMSHAFT OF BANK 2)

A

(a) Disconnect the fuel pressure sensor (for high pressure side) connector.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Check the communication between the Techstream and ECM.

HINT:

It can be checked using the "Engine" item of the Data List.

HINT:

Perform "Inspection After Repair" after replacing the fuel pressure sensor (for high pressure side).

Click here

B

REPLACE FUEL DELIVERY PIPE WITH SENSOR ASSEMBLY LH (FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE))

A

(a) Disconnect the fuel pressure sensor (for low pressure side) connector.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Check the communication between the Techstream and ECM.

HINT:

It can be checked using the "Engine" item of the Data List.

HINT:

Perform "Inspection After Repair" after replacing the fuel pressure sensor (for low pressure side).

Click here

B

REPLACE FUEL DELIVERY PIPE RH (FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE))

A

(a) Disconnect the mass air flow meter sub-assembly connector.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Check the communication between the Techstream and ECM.

HINT:

It can be checked using the "Engine" item of the Data List.

B

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

A

(a) Disconnect the canister pump module connector.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Check the communication between the Techstream and ECM.

HINT:

It can be checked using the "Engine" item of the Data List.

B

REPLACE CANISTER PUMP MODULE

A

(a) Disconnect the throttle body with motor assembly connector.

(b) Disconnect the accelerator pedal sensor assembly connector.

(c) Disconnect the crankshaft position sensor connector.

(d) Disconnect the VVT sensor (for intake camshaft of bank 1) connector.

(e) Disconnect the VVT sensor (for intake camshaft of bank 2) connector.

(f) Disconnect the VVT sensor (for exhaust camshaft of bank 1) connector.

(g) Disconnect the VVT sensor (for exhaust camshaft of bank 2) connector.

(h) Disconnect the fuel pressure sensor (for high pressure side) connector.

(i) Disconnect the fuel pressure sensor (for low pressure side) connector.

(j) Disconnect the mass air flow meter sub-assembly connector.

(k) Disconnect the ECM connectors.

(l) Disconnect the canister pump module connector.

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

Standard Resistance:

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

HINT:

Remove the EFI-MAIN NO. 2 and EFI-MAIN NO. 3 relays connected between the checked terminals as the coil inside the relay influences the measurement value.

Standard Resistance:

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR