DTC P1518: Starter Switch Circuit Low: Notes

WARNING: This page is about a different variant/trim than selected.

1. -

DTC detecting condition:

Detected when three consecutive driving cycles with fault occur.

Trouble symptom:

Auto Start Stop does not operate.

Wiring diagram:

Auto Start Stop Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>AUTO START STOP .

G13228211

Courtesy of SUBARU OF AMERICA, INC.

CAUTION:

Use the check board when measuring the TCM terminal voltage and resistance.
After servicing or replacing faulty parts, perform the last step of the basic diagnostic procedure. Ref. to AUTO START STOP (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

CHECK DATA MONITOR .
Read the data of [Starter Switch] using Subaru Select Monitor. Ref. to AUTO START STOP (DIAGNOSTICS)>DATA MONITOR .

Is [OFF] displayed in [Starter Switch]?

Yes: Go to 2.

No: The circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
CHECK INPUT VOLTAGE OF TCM .
1. Turn the ignition switch to OFF.
2. Disconnect the TCM connector.
3. Start the engine.
4. Measure the voltage between TCM connector and chassis ground.
  Connector and terminal
  
  (T10) No. 45 (+) - Chassis ground (-):
Is the voltage less than 1 V?

Yes: Check the following item and repair if necessary.
- Model with push button start
  Repair the open circuit of harness between keyless access control module and TCM connector.
- Model without push button start
  Open harness between ignition switch and TCM connector
  
  Poor contact inside the ignition switch
No: Check for poor contact of TCM connector. Replace the TCM if no fault is found. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 CROSSTREK)>TRANSMISSION CONTROL MODULE (TCM) .