Isuzu KB P190. Manual - part 964
Automatic Transmission – 4L60E – Electrical Diagnosis
Page 7C2–70
Step Action
Yes
No
3
1
Inspect the shift solenoid/hydraulic circuit for the following
conditions:
•
Debris or chips in the AFL oil passage.
•
Debris or chips restricting oil flow in passage #29 of the
case or through the spacer plate gasket into the valve
body.
•
A cracked 2-3 shift solenoid.
•
A 2-3 shift valve which is stuck or hung up in the valve
body bore.
•
A 2-3 shuttle valve which is stuck or hung up in its bore.
•
Damaged seals on the shift solenoid valves. Perform the
shift solenoid leak test, refer to 7C3 Automatic
Transmission – 4L60E – Hydraulic and Mechanical
Diagnosis.
2
Clean and inspect the related valves, bores and the valve body
for debris or contamination.
Did you find and correct the condition?
Go to Step 4
—
4
Perform the following procedure to verify the repair:
1
On Tech 2 select:
Diagnostic Trouble Codes / Clear Engine & Transmission
DTCs
2
Follow the instructions on Tech 2 and clear any DTCs.
3
Drive the vehicle in D4 range under the following conditions,
only if traffic and road conditions permit:
•
Hold the throttle at 40%, and
•
Accelerate to 64 km/h.
4
On Tech 2 select:
Diagnostic Trouble Codes / Read DTC Information.
Has DTC P0756 set?
Go to Step 2
Go to Step 5
5
On Tech 2 select:
Diagnostic Trouble Codes / Read DTC Information.
Does Tech 2 display any DTCs you have not diagnosed?
Refer to
4.8 Diagnostic
Trouble Code List
System OK
When all diagnosis and repairs are completed, check the system for correct operation.
4.23 DTC P0757 – 2-3 Shift Solenoid Valve
Performance – No Third or Fourth Gear
DTC Description
This diagnostic procedure supports DTC P0757 2-3 Shift Solenoid (SS) Valve Performance – No Third or Fourth Gear.
Circuit Description
The 2-3 shift solenoid (SS) valve controls the fluid flow acting on the 2-3 shift valves. The 2-3 SS valve is a normally-
open exhaust valve that is used with the 1-2 SS valve to allow four different shifting combinations.
When the transmission control module (TCM) detects a 1-2-2-1 shift pattern, then DTC P0757 sets. DTC P0757 is a
type A DTC.
Refer to 2
Wiring Diagrams and Connector Chart to aid in diagnosis.