P1863

LOCK-UP SOLENOID VALVE, SOLENOID LOCK-UP (SL), SHORTED TO GROUND (P1862) OR OPEN CIRCUIT SHORTED TO BATTERY POSITIVE (B+) (P1863)





Fault Symptom.
P1862: Lock-up function does not engage.
P1863: Lock-up function does not engage correctly.

Conditions.
P1862: Short-circuit to ground when the solenoid is activated. The solenoid is activated it the car is driven in gear position D in 3rd or 4th gear with the lock-up function initiated.
P1863: Short-circuit to battery positive (B+) or open circuit when the solenoid is not activated. The solenoid is not activated if the car is driven in gear position D or 3 in 1st or 2nd gear.

Diagnostic Help.
^ Solenoid SL can be activated by the ISAT scan tool as follows:
Select "ACTIVATE".
Select "SOLENOID LOCK-UP".
The solenoid will be activated for 30 seconds at a frequency of 1 Hz. Listen for the clicking sound.

^ Without using the ISAT scan tool, solenoid SL can be activated as follows:
Turn the ignition switch to the ON position.
Move the selector lever to position D.
When WINTER mode is selected, the solenoid goes ON (operates) and when WINTER mode is disengaged the solenoid goes OFF (releases). Listen for the clicking sound.





Procedure.
1. Check the resistance of the solenoid valve Unplug connector H16-3 (16-pin connector located behind the battery). Take a resistance reading across pin 10 of the male connector and a good grounding point on the transmission.
The reading obtained should be 10-20 ohms.

Is the resistance OK?

YES: Proceed to point 3.
NO: Continue with point 2.

2. Check the resistance of the solenoid valve (contd.)

Remove the valve housing cover and the solenoid lead. Check the resistance of the lead between pin 10 of male connector H16-3 and the solenoid.
The resistance should be less than 0.5 ohms.

Is the resistance OK?

YES: Carry out a visual check of the solenoid's electrical connection for moisture and corrosion. If any probable cause of the fault can be seen it should be rectified, otherwise the solenoid should be changed. Then proceed to point 5.
NO: Repair or replace the wiring (including connectors) between connector H16-3 and the solenoid. Then proceed to point 5.





3. Check The Wiring connected to the transmission control module

Check the continuity of the lead between pin 10 of connector H16-3 and pin 19 of the transmission control module's connector. Remember to check for slide-out of connector pins and sockets.

Is the wiring OK?

YES: Continue with point 4.
NO: Rectify the fault and proceed to point 5.

4. Check the transmission control module output
- Plug in the transmission control module.
- Connect a test lamp to pin 10 of female connector H16-3 and battery negative (B-).
- Connect the ISAT scan tool.
- Turn the ignition switch to the ON position.
- Select "ACTIVATE".
- Select "SOLENOID LOCK-UP". The test lamp should flash for 30 seconds.

Does the test lamp flash?

YES: Check the solenoid and its electrical connection for moisture and corrosion. If there is no probable cause of the fault, the solenoid should be changed. Then continue with point 5.
NO: Continue with point 5.




5. Final check

Clear the diagnostic trouble code, drive the car on test at varying engine loads and speeds for 5 minutes and obtain readouts of any diagnostic trouble bodes that are generated.

Has the diagnostic trouble code recurred?

YES: Continue as described under "Before Changing A Control Module". Before Changing A Control Module
NO: The remedial action taken was correct.