P0986

U250E AUTOMATIC TRANSMISSION / TRANSAXLE: AUTOMATIC TRANSAXLE SYSTEM: P0985,P0986: Shift Solenoid "E" Control Circuit Low (Shift Solenoid Valve SR)
P0986 - Shift Solenoid "E" Control Circuit High (Shift Solenoid Valve SR)

DESCRIPTION

Shifting from 1st to 5th is performed in combination with "ON" and "OFF" operation of the shift solenoid valves SL1, SL2, SL3, S4 and SR which are controlled by the ECM. If an open or short circuit occurs in either of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated smoothly (Fail safe function).





MONITOR DESCRIPTION

The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF". When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and stores the DTC. And the ECM performs the fail-safe function and turns the other normal shift solenoid valves "ON/OFF" (In case of an open or short circuit, the ECM stops sending current to the circuit.)

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MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

P0985: Range check (Low resistance):

P0985: Range check (Low resistance)::

P0986: Range check (High resistance):

P0986: Range check (High resistance)::

TYPICAL MALFUNCTION THRESHOLDS

P0985: Range check (Low resistance):

P0985: Range check (Low resistance)::

P0986: Range check (High resistance):

P0986: Range check (High resistance)::

COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Perform the universal trip to clear permanent DTCs .

PROCEDURE

1. INSPECT TRANSMISSION WIRE (SR)

(a) Disconnect the transmission wire connector from the transaxle.





(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- INSPECT SHIFT SOLENOID VALVE SR
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (TRANSMISSION - ECM)

(a) Connect the transmission connector to the transaxle.





(b) Disconnect the connector from the ECM.

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Removal

3. INSPECT SHIFT SOLENOID VALVE SR

(a) Remove the shift solenoid valve SR.





(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:





(c) Connect the positive (+) lead to the terminal of the solenoid connector, and the negative (-) lead to the solenoid body.

OK:

The solenoid makes an operating sound.

NG -- REPLACE SHIFT SOLENOID VALVE SR

OK -- REPAIR OR REPLACE TRANSMISSION WIRE