TROUBLE DIAGNOSES — Diagnostic Procedure 5
AT-50flowchartAutomatic Transmission (A/T) diagnostic procedure. Applies to A/T equipped 1989 Nissan 200SX (S13).
Diagnostic Procedure 5
IMPORTANT
SYMPTOM: There is large shock when changing from "N" to "R" range.
Diagnostic Procedure 5 Flowchart
1
Does self-diagnosis show damage to throttle sensor, line pressure solenoid or fluid temperature sensor circuit?
Yes
Check damaged circuit. — Refer to "Self-diagnosis".
No
2
Check throttle sensor. — Refer to section EF & EC.
N.G.
Repair or replace throttle sensor.
O.K.
3
Check line pressure at idle with selector lever in "D" range. — Refer to "PRESSURE TESTING".
N.G.
1. Remove control valve assembly. — Refer to "ON-VEHICLE SERVICE".
1. Remove control valve assembly. — Refer to "ON-VEHICLE SERVICE".
2. Check the following items.
• Valves to control line pressure (Pressure regulator valve, modifier valve, pilot valve and pilot filter)
• Line pressure solenoid
O.K.
4
Check again.
N.G.
1. Perform A/T control unit input/output signal inspection.
1. Perform A/T control unit input/output signal inspection.
2. If N.G., recheck A/T control unit pin terminals for damage or connection of A/T control unit harness connector.
O.K.
INSPECTION END
Component LocationFig. fig1
Self-diagnosis indicator showing O/D OFF lamp flash pattern for throttle sensor circuit, fluid temperature sensor circuit, and line pressure solenoid circuit
SAT758B
1O/D OFF(top-left)
2Throttle sensor circuit(top-center)
3Fluid temperature sensor circuit(top-right)
4Line pressure solenoid circuit(right)
5Light(right)
6Shade(right)
7Self-diagnosis start(left)
Throttle sensor and fluid temperature sensor circuit to A/T control unit
Components (6)
Throttle sensorFluid temperature sensorE.C.U.A/T control unitDropping resistorLine pressure solenoid
Component LocationFig. fig3
Location of throttle sensor and throttle valve switch on engine throttle body
SAT909B
1Throttle sensor and throttle valve switch(top-center)
See also
Self-diagnosis · PRESSURE TESTING · ON-VEHICLE SERVICE