Subaru Crosstrek Service Manual: Dtc p0890 tcm power relay sense circuit low

Subaru Crosstrek Service Manual / Continuously variable transmission (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p0890 tcm power relay sense circuit low

CONTINUOUSLY VARIABLE TRANSMISSION (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P0890 TCM POWER RELAY SENSE CIRCUIT LOW

DTC detecting condition:

Immediately at fault recognition

Trouble symptom:

Gear is not changed.

CAUTION:

• After diagnosis, perform Clear Memory Mode for ECM. Clear Memory Mode">

• Use the check board when measuring the TCM terminal voltage and resistance.

Wiring diagram:

CVT control system CVT Control System">

STEP	CHECK	YES	NO

1.CHECK HARNESS.

1) Disconnect the TCM connector.

2) Remove the self shut relay.

3) Measure the resistance between TCM connector and relay holder.

Connector & terminal

(B54) No. 25 — (B220) No. 16:

(B54) No. 8 — (B220) No. 15:

(B54) No. 24 — (B220) No. 15:

(B54) No. 40 — (B220) No. 15:

Is the resistance less than 1 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0890 TCM POWER RELAY SENSE CIRCUIT LOW">Go to Step 2.

Repair the open circuit of harness.

2.CHECK HARNESS.

Measure the resistance between TCM connector and chassis ground.

Connector & terminal

(B54) No. 25 — Chassis ground:

(B54) No. 8 — Chassis ground:

(B54) No. 24 — Chassis ground:

(B54) No. 40 — Chassis ground:

Is the resistance 1 M? or more?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0890 TCM POWER RELAY SENSE CIRCUIT LOW">Go to Step 3.

Repair the short circuit of harness.

3.CHECK RELAY POWER SUPPLY.

Measure the voltage between relay holder and chassis ground.

Connector & terminal

(B220) No. 14 (+) — Chassis ground (−):

(B220) No. 17 (+) — Chassis ground (−):

Is the voltage 11 — 13 V or more?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0890 TCM POWER RELAY SENSE CIRCUIT LOW">Go to Step 4.

Repair the open or short circuit of harness.

4.CHECK SELF SHUT RELAY.

Measure the resistance between self shut relay terminals.

Terminals

No. 16 — No. 17:

Is the resistance 110 — 140 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0890 TCM POWER RELAY SENSE CIRCUIT LOW">Go to Step 5.

Replace the self shut relay.

5.CHECK SELF SHUT RELAY.

Measure the resistance between self shut relay terminals.

Terminals

No. 14 — No. 15:

Is the resistance 1 M? or more?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0890 TCM POWER RELAY SENSE CIRCUIT LOW">Go to Step 6.

Replace the self shut relay.

6.CHECK INPUT SIGNAL FOR TCM.

1) Connect the TCM connector.

2) Install the self shut relay.

3) Read the data of «Control module voltage» using Subaru Select Monitor.

Is the «Control module voltage» 10 V or more?

Current condition is normal. Check for poor contact in connectors or harnesses, and repair the defective part.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0890 TCM POWER RELAY SENSE CIRCUIT LOW">Go to Step 7.

7.CHECK SELF SHUT RELAY.

1) Turn the ignition switch to OFF.

2) Replace the self shut relay.

3) Perform the Clear Memory Mode. Clear Memory Mode">

4) Read the DTC.

Is DTC P0890 displayed?

Replace the TCM. Transmission Control Module (TCM)">

The original self shut relay is defective.

1. OUTLINE OF DIAGNOSIS

• Detect the malfunction of transmission fluid pressure solenoid drive power supply relay circuit.

• Judge as NG if the transmission fluid pressure solenoid drive power supply voltage is lower than the predetermined value.

2. EXECUTION CONDITION

Secondary Parameters	Execution condition
12 V battery system voltage	≥ 9 V
Ignition state	Run or Crank

3. DIAGNOSTIC METHOD

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

Malfunction Criteria	Threshold Value
Measured TCM input voltage which is supplied from 12 V battery system through the TCM Power Relay	< 2 V

Time Needed for Diagnosis: 0.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

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