A/T - Improper Operation Diagnostic Addition
ClassificationAT94-001a
Section
Automatic Transmission
Models
1991-93 G2O
Reference
TECHNICAL BULLETIN ITB94-OO4a
Date
November 29, 1994
1991-93 G2O (P10) IMPROPER OPERATION
OF F03A AUTOMATIC TRANSMISSION
NOTE:
This is a revised Technical Bulletin presenting additional diagnostic information. Please discard your original copy of ITB94-004 (AT94-001).
APPLIED MODELS
1991-93 G2O (P10) with F03A (4 speed A/T)
APPLIED C/M DATE
February 1993
SERVICE INFORMATION
This bulletin applies if a 1991-93 G2O exhibits one or more of the following symptoms:
^ Automatic transmission downshifts from 3rd gear to 2nd gear and will not upshift back to 3rd gear.
^ Automatic transmission will not upshift to 3rd gear on normal acceleration.
^ Automatic transmission will not upshift from 3rd gear to 4th gear. Shift shock from "N" to "D".
^ Automatic transmission slips, poor acceleration.
NOTE:
Automatic transmission operation is normal until engine reaches operating temperature of 95°C (180°F).
SERVICE PROCEDURE
Some of these symptoms may be caused by a burnt High Clutch or a sticking Control Valve Assembly. Debris from the burnt High Clutch may have gotten into the Control Valve Assembly, causing it to stick. The shape of the oil feed hole on the oil pump housing has been modified, allowing oil to enter more easily. This improves oil flow and lubrication, preventing a burnt High Clutch.
1. Replace the damaged High Clutch is an Assembly (refer to the appropriate Parts Microfiche for the correct part number with respect to vehicle production date).
2. When repairing the automatic transmission on a 1991-93 G2O (P10), the Control Valve Body should be cleaned and thoroughly inspected for wear on individual valves and Control Valve body bores. If wear is noted, repair or replace as necessary.
3. Applied Unit [Oil Pump Housing] Countermeasure (C/M) Production Date: If the vehicle was produced before February 1, 1993, replace the Oil Pump Housing with C/M part. After February 1, 1993 production, do not replace the Oil Pump Housing. (Figure 1)
4. If a substantial amount of debris is found in the Oil Pick Up Strainer during repair, replace the Oil Cooler/Radiator.
NOTE:
If the Oil Cooler is a FIN type, it is not serviceable. Refer to Technical Bulletin 1TB91.054 (AT91-003) for further details, if necessary.
PARTS INFORMATION
DESCRIPTION PART # QUANTITY
Housing, Oil Pump 31341-31X00 1
WARRANTY INFORMATION
Please reference the "JC-Automatic Transaxle" section on the current Warranty Flat Rate Manual" and utilize the appropriate OP Code/PNC/Symptom/Diagnosis/FRT combinations indicated by the repairs performed.