i-350 L5-3.5L (2006)
Torque Converter Clutch Solenoid: Customer Interest
A/T - Harsh 1-2 Shift/MIL ON/DTC P0894 Set
TSB SB08-04-S001
Issue Date: FEBRUARY 2008
Malfunction Indicator Lamp (MIL) On, Diagnostic Trouble Code (DTC) P0894, Harsh 1-2 Shift With 4L60-E Auto Transmission
(This Bulletin Supersedes SB07-04-S001)
Affected Vehicles
2006 Isuzu Ascender
2006 Isuzu i-280/i-350 (TI)
Service Information
This bulletin is being revised to update Warranty Information.
Condition:
Some customers may comment on a harsh 1-2 shift with the MIL illuminated. Diagnosis with a scan tool may reveal a DTC P0894.
Possible Cause:
This condition may be caused by a leaking TCC enable solenoid. The TCC enable solenoid is part of the automatic transmission wiring harness.
Correction:
Test and if necessary replace TCC enable solenoid/harness, auto transmission wiring.
Service Procedure
Follow the diagnosis and repair procedure below for a DTC P0894.
1.
With a scan tool, verify the presence of DTC P0894.
2.
Remove the TCC Enable solenoid / automatic transmission wiring harness. Refer to Torque Converter Clutch Pulse Width Modulation (TCC
PWM) Solenoid, TCC Solenoid, and Wiring Harness in the Service Manual.
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Typically if the TCC enable solenoid is found to have a crack / fracture (2), it will be located parallel to the mold seam (1) as shown.
Tip
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Engineering investigation shows that TCC enable solenoids that are brown in color may exhibit the cracking / fracture condition.
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Engineering investigation shows that TCC enable solenoids that are off-white in color do not exhibit the cracking / fracture condition.
3.
Air check the TCC enable solenoid using the Kent Moore J 44246 Solenoid Testing Kit available though Kent Moore at (800) 345-2233.
