Toyota Camry Manual page 299

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DTC P1765 Shift Solenoid Valve SLN Circuit (For

Accumulator Back Pressure Modulation)

CIRCUIT DESCRIPTION

The shift solenoid valve SLN controls the hydraulic pressure acting

on the accumulator control valve when gears are shifted and per–

forms smooth gear shifting.

The ECM determines optimum operating pressure according to the

signals from the throttle position sensor, vehicle speed sensor and

direct clutch speed sensor and controls the volume of current flow

to the solenoid valve.

The amount of current to the solenoid is controlled by the (*) duty

ratio of ECM output signals, causing a momentary change to the

hydraulic pressure acting on the clutches during gear shifting.

When the duty ratio is high, the hydraulic pressure acting on the

clutches is low.

(*) Duty Ratio

The duty ratio is the ratio of the period of continuity in one cycle.

For example, if A is the period of continuity in one cycle, and B is the period of non–continuity, then

Duty Ratio = A

Diagnostic Trouble Code Detecting Condition

After the engine is warmed up, the current flow

to the shift solenoid valve SLN is 0.2A or less for

at least 1 sec. under condition ay or b).

(2 trip detection logic)

aj Engine speed: 500 rpm or more

b) Park/neutral position switch: ON

(P or N position)

< Reference >

Waveform between terminals SLN–

and E 1 when engine is idling.

AUTOMATIC TRANSAXLE

TROUBLESHOOTING

Trouble Area

Open or short in shift solenoid valve SLN

Shift solenoid valve SLN.

Waveform between terminals SLN–

and E 1 during shift change.