7A2-6 DIAGNOSIS (JR405E)
BASIC TROUBLE SHOOTING
Transmission fluid pressure together with clutch and brake friction and other important transmission functions are
controlled by electrical signal from the Transmission Control Module (TCM).
Random diagnosis can produce inaccurate and misleading indications. It is important that diagnosing procedure be
carried out systematically.
Carefully follow the sequence outlined below to diagnose automatic transmission assembly.
Verify Customer Complain
Preliminary Check
(Visual Check/Test Drive)
Compare to Same Model
(If Available)
Check Service Bulletin
DTC Check
(Self-diagnosis/Tech 2)
Go to Symptom Diagnosis
Stall Test
Line Pressure Test
Transmission Overhaul
Repair & Verify Fix
Transmission Overhaul
Transmission Overhaul
Go to DTC Chart
Go to Intermittent Diagnosis NG
Follow the instructions
NG
No Instruction
NG
OK
NO DTC
Not Solved
OK
OK
Follow the Bulletin
(Once Clear Memory) Restored
Not Stored
Use Service Programming
System (SPS)
Not Solved
7A3-2 ON-VEHICLE SERVICE (JR405E)
DESCRIPTION
Before performing on-vehicle service on the automatic
transmission, check that the engine idling speed and
general engine condition are normal.
AUTOMATIC TRANSMISSION FLUID (ATF)
Inspect
Remove the transmission dipstick to check the condition
of the ATF.
Clean the dipstick and look for gum or varnish.
Gum or varnish indicate scorching of the clutch band
and other parts.
The transmission control module, the transmission unit,
and the vehicle must be carefully checked if gum or
varnish is present.
ATF LEVEL
Inspect
Hot Level
1. Warm up the engine and the transmission by driving
the vehicle on the road so that the temperature
reaches around 80C (176F).
Do not turn the engine off.
2. Park the vehicle on a level surface.
3. Apply the parking brake firmly.
4. Let the engine run at idle.
Move the select lever slowly through all the gea
r
ranges.
Stop in each gear range just long enough for the
transmission to engage.
5. Return the select lever to either “P” or “N”.
C07RW009
6. Remove the ATF level dipstick.
7. Wipe the dipstick clean with a paper towel.
8. Reinsert the dipstick and wait several seconds.
9. Remove the dipstick.
The ATF level should be inside the “H” range on the
dipstick.
242R300001
If the ATF level is below the “H” range, ATF must be
added.
