Honda Civic manuals

Subaru Legacy Service Manual: Dtc c1521 motor relay

DTC DETECTING CONDITION:

A fault is detected if the pump motor supply voltage becomes significantly low when the pump motor is not driven.

TROUBLE SYMPTOM:

ABS does not operate sometimes.

VDC does not operate.

Hill hold does not function.

EyeSight does not operate. (Models with EyeSight)

WIRING DIAGRAM:

Vehicle dynamics control system Vehicle Dynamics Control System

STEPCHECKYESNO

1.CHECK VDCCM&H/U INPUT VOLTAGE.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from the VDCCM&H/U.

3) Turn the ignition switch to ON.

4) Measure the voltage between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 5 (+) — Chassis ground (−):

(B310) No. 33 (+) — Chassis ground (−):

Is the voltage 10 — 15 V-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1521 MOTOR RELAY

Repair the VDCCM&H/U power supply circuit.

2.CHECK VDCCM&H/U INPUT VOLTAGE.

Calculate the voltage difference measured in step 1.

A: (B310) No. 5 (+) — Chassis ground (−):

B: (B310) No. 33 (+) — Chassis ground (−):

Is the voltage difference between A and B 2 V or more-

Repair the power supply circuit.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1521 MOTOR RELAY

3.CHECK INSTALLATION OF VDCCM&H/U GROUND.

Is the VDCCM&H/U ground terminal installation bolt installed correctly-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1521 MOTOR RELAY

Install the VDCCM&H/U ground terminal installation bolt correctly.

4.CHECK VDCCM&H/U GROUND CIRCUIT (CHECK FOR OPEN CIRCUIT).

1) Turn the ignition switch to OFF.

2) Measure the resistance between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 46 — Chassis ground:

Is the resistance less than 10 --

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1521 MOTOR RELAY

Repair the VDCCM&H/U ground harness.

5.CHECK VDCCM&H/U MOTOR RELAY.

Measure the resistance between VDCCM&H/U terminals.

Terminals

No. 33 — No. 46:

Is the resistance 1 M- or more-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1521 MOTOR RELAY

Replace the VDCCM&H/U. VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

6.CHECK POOR CONTACT OF CONNECTORS.

Turn the ignition switch to OFF.

Is there poor contact of connector between generator, battery and VDCCM&H/U-

Repair the connector.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1521 MOTOR RELAY

7.CHECK VDCCM&H/U.

1) Connect all connectors.

2) Perform the Clear Memory Mode. Clear Memory Mode

3) Perform the Inspection Mode. Inspection Mode

4) Read the DTC. Read Diagnostic Trouble Code (DTC)

Is the same DTC displayed-

Replace the VDCCM&H/U. VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1521 MOTOR RELAY

8.CHECK DETECTION OF OTHER DTCS FOR VDC.

Read Diagnostic Trouble Code (DTC)

Is any other DTC displayed-

Perform the diagnosis according to DTC. List of Diagnostic Trouble Code (DTC)

Currently, it is normal. There may have been a poor contact in the harness and connector or a temporarily noise interference.

NOTE:

Though the ABS warning light, and the VDC warning light & VDC indicator light may remain lit at this point, this is normal. Drive the vehicle at 40 km/h (25 MPH) or more in order to turn off the ABS warning light, and the VDC warning light & VDC indicator light. Be sure to drive the vehicle and check that the warning light goes off.

Dtc u0155 lost communication with instrument panel cluster (ipc) control module
NOTE:Refer to “LAN SYSTEM (DIAGNOSTICS)” for diagnostic procedure. Basic Diagnostic Procedure ...

Dtc c1511 valve relay
DTC DETECTING CONDITION:A fault is detected if valve relay drive voltage failure is detected.TROUBLE SYMPTOM:• ABS does not operate.• EBD does not operate.• VDC does not operate.&bul ...

Other materials:

Inspection
1. UNIT INSPECTIONCheck the following items, and if there is anything out of standard value, it is considered to be damaged. If so, replace it with a new part.• Measure the whole length of the column assembly - steering.Standard: Overall length LTilt (measure at the neutral position) and teles ...

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