23A-DTC P0970 PRIMARY PRESSURE SOLENOID MALFUNCTION

DTC P0970: Malfunction of the Primary Pressure Solenoid Valve (low input)

DIAGNOSTIC FUNCTION

If a predetermined current does not flow into the primary pressure solenoid valve (short to ground), the TCM will determine the system is defective.

DESCRIPTIONS OF MONITOR METHODS

The solenoid valve drive circuit remains short to ground for 0.48 seconds.

MONITOR EXECUTION

Voltage of battery: 10 volts or more.

MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)

Not applicable

Sensor (The sensor below is determined to be normal)

Not applicable

LOGIC FLOW CHARTS (Monitor Sequence)

DTC SET CONDITIONS

Check Conditions

Voltage of battery: 10 volts or more.

Judgment Criteria

Primary pressure solenoid valve actual current: 1.78 A or more (0.5 seconds).

OBD-II DRIVE CYCLE PATTERN

Ignition switch: ON (start the engine and keep it for 5 seconds or more).

PROBABLE CAUSES

Malfunction of the valve body assembly (Faulty primary pressure solenoid valve)
Damaged wiring harness and connectors
Malfunction of TCM

DIAGNOSIS

Required Special Tools

MB992006: Extra fine probe

STEP 1. Check for short to ground in PRLS line between the CVT assembly connector and the TCM connector.

Is the check result normal?

Go to Step 2

Repair the connector(s) or the wiring harness.

STEP 2. Primary pressure solenoid valve check.

Refer to

Is the check result normal?

Go to Step 4

Go to Step 3

STEP 3. Check for short to ground in power supply line between the CVT assembly connector and the valve body harness connector (primary pressure solenoid valve line).

Refer to

Is the check result normal?

Replace the valve body assembly (Refer to

Replace the valve body harness (Refer to

STEP 4. Symptom recheck after erasing diagnostic trouble code.

Is the diagnostic trouble code set?

Replace the TCM.

Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunctions