P1857, P1858
Symptom: CHECK GEARBOX warning lamp on.
TCM in Limp-Home mode.
Solenoid 2-3. Short to Ground.
Solenoid 2-3. Open Circuit / Short to B+.
Fault symptoms
CHECK GEARBOX warning lamp on.
TCM in Limp-Home mode.
Conditions
P1857: Short circuit to ground.
P1858: Short circuit or open circuit to B+
Diagnostic help
The status of the 2-3 shift solenoid (S2) can be ascertained with the diagnostics instrument.
Select "
Data Display / Output Control (New)"
Select "
Solenoid 2-3 (S2)"
The 2-3 shift solenoid (S2) should be activated (ON) in 1st and 2nd gears when the car is being driven and not activated (OFF) in the other gears.
The 2-3 shift solenoid (S2) can be activated with the diagnostics instrument.
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Activate “
Solenoid 2-3”
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Diagnostic procedure
1 Check the control module output to solenoid 2-3 (S2).
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Unplug connector H16-3 by the battery tray.
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Connect a test lamp between pin 9 in the female connector and a good grounding point.
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Connect a diagnostic tool.
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Turn the ignition to the ON position.
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Activate “
Solenoid 2-3”.
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The lamp should light up.
All OK?
Continue with step 2.
Rectify the relevant lead and continue with step 4, final check.
2 Check the wiring harness from the 16-pin connector to the grommet in the gearbox.
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Turn the ignition key to the OFF position
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Inspect for external damage to the wiring harness.
Is there any external damage?
Rectify the damage and continue with step 4, final check.
Continue with step 3.
3 Check the lead between the 16-pin connector and Solenoid S2.
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Plug in connector H16-3 by the battery tray.
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Remove the cover on the valve housing.
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Unplug the connector for solenoid 2-3 (S2).
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Connect a test lamp between the connector pin and a good grounding point.
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Connect a diagnostic tool.
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Turn the ignition to the ON position.
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Activate “
Solenoid 2-3”.
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The lamp should go on.
All OK?
Change solenoid 2-3 (S2) and continue with step 4, final check.
Rectify the lead between the connector for solenoid 2-3 (S2) and pin 9 in the 16-pin connector and continue with step 4, final check.
4 Final check
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Clear all diagnostic trouble codes in the system.
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Perform a driving cycle:
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Drive the car at varying loads and engine speeds for 5 minutes.
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Evaluate the driving cycle:
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Make sure the trouble code has not recurred.
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Has the trouble code recurred?
Continue with “
Diagnostic procedure before replacing control module
"
The steps taken to rectify the fault were correct.
