Toyota Corolla (2004+). Manual — part 47
DIAGNOSTICS
- ELECTRONIC CONTROLLED AUTOMATIC
05-405
TRANSAXLE [ECT] (April, 2003)
2
CHECK HARNESS AND CONNECTOR(TRANSMISSION WIRE - ECM)
(a) Connect the transmission connector to the transaxle.
E3
E4
E5
E6
(b) Disconnect the connector from the ECM.
(c)
Measure the resistance according to the value(s) in the
table below.
Standard:
Specified Condition
Tester Connection
20 _C (68 _F)
ECM:
E4 - 15 (S1) - Body ground
11 to 15 W
S1
C95812
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR (See page 01-30)
OK
REPLACE ECM (See page 10-11)
3
INSPECT SHIFT SOLENOID VALVE(S1)
(a) Remove the shift solenoid valve S1.
Shift Solenoid Valve S1:
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Specified Condition
Tester Connection
20 _C (68 _F)
Solenoid Connector (S1) - Solenoid
11 to 15 W
Body (S1)
(c)
Connect the positive (+) battery lead to the solenoid con-
nector terminal, and the negative (-) battery lead to the
solenoid body for checking the solenoid valve operation.
Standard:
The solenoid makes an operating noise.
(+)
(-)
G27629
NG REPLACE SHIFT SOLENOID VALVE(S1)
OK
REPAIR OR REPLACE TRANSMISSION WIRE (See page 40-27)
05-406
DIAGNOSTICS
- ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (April, 2003)
05DU8-01
DTC
P0976
SHIFT SOLENOID ”B” CONTROL CIRCUIT
LOW (SHIFT SOLENOID VALVE S2)
DTC
P0977
SHIFT SOLENOID ”B” CONTROL CIRCUIT
HIGH (SHIFT SOLENOID VALVE S2)
CIRCUIT DESCRIPTION
See page 05-402.
DTC No.
DTC Detection Condition
Trouble Area
F Short in shift solenoid valve S2 circuit
ECM detects short in solenoid valve S2 circuit 4 times when
P0976
F Shift solenoid valve S2
solenoid valve S2 is operated (1-trip detection logic)
F ECM
F Open in shift solenoid valve S2 circuit
ECM detects open in solenoid valve S2 circuit 4 times when
P0977
F Shift solenoid valve S2
solenoid valve S2 is not operated (1-trip detection logic)
F ECM
MONITOR DESCRIPTION
The ECM commands gearshift by turning the shift solenoid valves ”ON/OFF”. When there is an open or short
circuit in any shift solenoid valve circuit, the ECM detects the problem and the MIL comes on. Illuminating
the MIL, the ECM performs the fail-safe and turns the other shift solenoid valves in good condition ”ON/OFF”
(In case of an open or short circuit, the ECM stops sending current to the circuit.).
MONITOR STRATEGY
P0976
Shift solenoid ”B”/Range check (Low resistance)
Related DTCs
P0977
Shift solenoid ”B”/Range check (High resistance)
Required sensors/Components
Shift solenoid valve S2
Frequency of operation
Continuous
Duration
2 times or more
MIL operation
Immediate
Sequence of operation
None
TYPICAL ENABLING CONDITION
Specification
Item
Minimum
Maximum
The monitor will run whenever the follow-
See page 05-369
ing DTCs are not present.
Range check (Low resistance)
Solenoid
ON
Time after solenoid OFF to ON
More than 0.008 sec.
-
Range check (High resistance)
Solenoid
OFF
Time after solenoid ON to OFF
More than 0.008 sec.
-
DIAGNOSTICS
- ELECTRONIC CONTROLLED AUTOMATIC
05-407
TRANSAXLE [ECT] (April, 2003)
TYPICAL MALFUNCTION THRESHOLDS
Detection criteria
Threshold
Range check (Low resistance)
Number of solenoid ON/OFF change with intelligent power
MOS diagnosis signal failure
4 times (0.064 sec.)
(Fail at solenoid resistance
8 W)
Range check (High resistance)
Number of solenoid ON/OFF change with intelligent power
MOS diagnosis signal failure
4 times (0.064 sec.)
(Fail at solenoid resistance
100 kW)
COMPONENT OPERATING RANGE
Parameter
Standard value
Shift solenoid valve S2 resistance
11 to 15 W at 20_C (68_F)
WIRING DIAGRAM
See page 05-402.
INSPECTION PROCEDURE
1
INSPECT TRANSMISSION WIRE(S2)
(a) Disconnect the transmission wire connector from the
Transmission Wire Side:
(Connector Front View):
transaxle.
(b) Measure the resistance according to the value(s) in the
table below.
E1
3
2
1
Standard:
6
4
5
Specified Condition
Tester Connection
20 _C (68 _F)
6 - Body ground
11 to 15 W
S2
D25254
NG Go to step 3
OK
2
CHECK HARNESS AND CONNECTOR(TRANSMISSION WIRE - ECM)
(a) Connect the transmission connector to the transaxle.
E3
E4
E5
E6
(b) Disconnect the connector from the ECM.
(c)
Measure the resistance according to the value(s) in the
table below.
Standard:
Specified Condition
Tester Connection
20 _C (68 _F)
ECM:
E4 - 14 (S2) - Body ground
11 to 15 W
S2
C95812
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR (See page 01-30)
OK
REPLACE ECM (See page 10-11)
05-408
DIAGNOSTICS
- ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (April, 2003)
3
INSPECT SHIFT SOLENOID VALVE(S2)
(a) Remove the shift solenoid valve S2.
Shift Solenoid Valve S2:
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Specified Condition
Tester Connection
20 _C (68 _F)
Solenoid Connector (S2) - Solenoid
11 to 15 W
Body (S2)
(c)
Connect the positive (+) battery lead to the solenoid con-
nector terminal, and the negative (-) battery lead to the
solenoid body for checking the solenoid valve operation.
Standard:
The solenoid makes an operating noise.
(+)
(-)
G27630
NG REPLACE SHIFT SOLENOID VALVE(S2)
OK
REPAIR OR REPLACE TRANSMISSION WIRE (See page 40-27)
DIAGNOSTICS
- ELECTRONIC CONTROLLED AUTOMATIC
05-345
TRANSAXLE [ECT] (April, 2003)
ELECTRONIC CONTROLLED AUTOMATIC TRANSAXLE
[ECT] (Apr., 2003)
05C0T-05
PRECAUTION
NOTICE:
Perform the RESET MEMORY (AT initialization) when replacing the automatic transaxle assy, engine
assy or ECM (See page 05-371).
HINT:
Initialization can not be completed by only removing the battery.
DIAGNOSTICS
- ELECTRONIC CONTROLLED AUTOMATIC
05-371
TRANSAXLE [ECT] (April, 2003)
05DU2-01
INITIALIZATION
1.
RESET MEMORY
CAUTION:
Perform the RESET MEMORY (AT initialization) when replacing the automatic transaxle assy, engine
assy or ECM.
NOTICE:
Hand-held tester only
(a) Turn the ignition switch off.
(b) Connect the hand-held tester to the DLC3.
(c)
Turn the ignition switch to the ON position.
(d) Perform the reset memory procedure from the ENGINE menu.
CAUTION:
After performing the RESET MEMORY, be sure to perform the ROAD TEST described earlier.
Tester menu flow:
G23367
05-356
DIAGNOSTICS
- ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (April, 2003)
05DTT-01
ROAD TEST
1.
PROBLEM SYMPTOM CONFIRMATION
(a) Taking into consideration the results of the customer problem analysis, try to reproduce the symptoms
of the trouble. If the problem is that the transaxle does not shift up, shift down, or the shift point is too
high or too low conduct the following road test referring to the automatic shift schedule and simulate
the problem symptoms.
2.
PERFORM ROAD TEST
NOTICE:
Conduct the test at normal operating ATF temperature 50 to 80
°C (122 to 176 °F).
(a) D position test
Shift into the D position and fully depress the accelerator pedal and check the following points:
(1)
Check up-shift operation.
Check that 1 2, 2 3 and 3 O/D up-shift takes place, and that the shift points conform to
the automatic shift schedule (See page 03-35).
HINT:
O/D Gear Up-shift Prohibition Control
F
Coolant temp. is 55 °C (131 °F) or less and vehicle speed is 70 km/h (43 mph) or less.
O/D and 3rd Gear Lock-up Prohibition Control
F
Brake pedal is depressed.
F
Accelerator pedal is released.
F
Coolant temp. is 55 °C (131 °F) or less.
3rd Gear Lock-up Prohibition Control
F
O/D main switch off (O/D ON)
(2)
Check for shift shock and slip.
Check for shock and slip at the 1 2, 2 3 and 3 O/D up-shift.
(3)
Check for abnormal noises and vibration.
Run in D position lock-up or O/D gear and check for abnormal noises and vibration.
HINT:
The check for the cause of abnormal noises and vibration must be done very thoroughly as it could also be
sure to loss of balance in the differential, torque converter, etc.
(4)
Check kick-down operation.
Check that the possible kick-down vehicle speed limits for 2nd to 1st, 3rd to 2nd, O/D to 3rd kick-
downs conform to those indicated on the automatic shift schedule while driving through all gears
with the shift lever in the D position (See page 03-35).
(5)
Check for abnormal shock and slip at kick-down.
(6)
Check the lock-up mechanism.
F
Drive in D position O/D gear, at a steady speed (lock-up ON) of about 60 km/h (37 mph).
F
Lightly depress the accelerator pedal and check that the engine speed does not change
abruptly.
If there is a big jump in engine speed, there is no lock-up.
(b)
2 position test
Shift into the 2 position and fully depress the accelerator pedal and check the following points:
(1)
Check up-shift operation.
Check that the 1 2 up-shift takes place and that the shift point conforms to the automatic shift
schedule (See page 03-35).
HINT:
There is no O/D up-shift and lock-up in the 2 position.
DIAGNOSTICS
-
ELECTRONIC CONTROLLED AUTOMATIC
05-357
TRANSAXLE [ECT] (April, 2003)
(2)
Check engine braking.
While running in the 2 position and 2nd gear, release the accelerator pedal and check the engine
braking effect.
(3)
Check for abnormal noises during acceleration and deceleration, and for shock at up-shift and
down-shift.
(c)
L position test
Shift into the L position and fully depress the accelerator pedal and check the following points:
(1)
Check no up-shift.
While running in the L position, check that there is no up-shift to 2nd gear.
(2)
Check engine braking.
While running in the L position, release the accelerator pedal and check the engine braking ef-
fect.
(3)
Check for abnormal noises during acceleration and deceleration.
(d) R position test
Shift into the R position and fully depress the accelerator pedal and check for slipping.
CAUTION:
Before conducting this test ensure that the test area is free from people and obstruction.
(e) P position test
Stop the vehicle on a grade (more than 5°), shift into the P position and release the parking brake.
Check that the vehicle does not move.
05-374
DIAGNOSTICS
- ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (April, 2003)
0527M-18
PROBLEM SYMPTOMS TABLE
HINT:
If a normal code is displayed during the DTC check but the trouble still occurs, check the circuits for each
symptom in the order given in the charts on the following pages and proceed to the page given for trouble-
shooting.
The Matrix Chart is divided into 3 chapters.
_
If the manual ”Proceed to next circuit inspection shown on matrix chart” is given in the flow chart
for each circuit, proceed to the circuit with the next highest number in the table to continue the check.
_
If the trouble still occurs even though there are no abnormalities in any of the other circuits, then check
and replace the ECM.
CHAPTER 1: ELECTRONIC CIRCUIT MATRIX CHART
Symptom
Suspect Area
See page
No up-shift (A particular gear, from 1st to 3rd gear, is not up-
ECM
01-30
shifted)
1. O/D main switch circuit
05-417
2. Electronically controlled transmission communication
05-770
No up-shift (3rd O/D)
circuit *1
3. O/D cancel signal circuit *1
05-419
4. ECM
01-30
1. O/D main switch circuit
05-417
2. Electronically controlled transmission communication
05-770
No down-shift (O/D 3rd)
circuit *1
3. O/D cancel signal circuit *1
05-419
4. ECM
01-30
No down-shift (A particular gear, from 3rd to 1st gear, is not
ECM
01-30
down-shifted)
No lock-up or No lock-up off
ECM
01-30
Shift point too high or too low
ECM
01-30
1. O/D main switch circuit
05-417
2. Electronically controlled transmission communication
05-770
Up-shift to O/D from 3rd while O/D main switch is OFF
circuit *1
3. O/D cancel signal circuit *1
05-419
4. ECM
01-30
Up-shift to O/D from 3rd while engine is cold
ECM
01-30
Harsh engagement (N D)
ECM
01-30
Harsh engagement (Lock-up)
ECM
01-30
Harsh engagement (Any driving position)
ECM
01-30
Poor acceleration
ECM
01-30
Engine stalls when starting off or stopping
ECM
01-30
No kick-down
ECM
01-30
1. Park/neutral position switch circuit
05-379
Malfunction in shifting
2. ECM
01-30
*1: w/ Cruise control
DIAGNOSTICS
-
ELECTRONIC CONTROLLED AUTOMATIC
05-375
TRANSAXLE [ECT] (April, 2003)
Chapter 2: On-vehicle repair
(F : A245E/A246E automatic transaxle repair manual Pub. No. RM941U)
Symptom
Suspect Area
See page
Does not move in any forward ranges
Off-vehicle matrix chart
-
Does not move in reverse range
Off-vehicle matrix chart
-
1.
Manual valve
F
2.
Valve body assembly (Primary regulator valve)
F
Does not move in any range
3.
Valve body assembly (Manual valve)
F
4.
Off-vehicle matrix chart
-
No-up shift
1.
Valve body assembly (1 - 2 shift valve)
F
(1st 2nd)
2.
Off-vehicle matrix chart
-
No-up shift
1.
Valve body assembly (2 - 3 shift valve)
F
(2nd 3rd)
2.
Off-vehicle matrix chart
-
No-up shift
1.
Valve body assembly (3 - 4 shift valve)
F
(3rd O/D)
2.
Off-vehicle matrix chart
-
No-down shift
1.
Valve body assembly (3 - 4 shift valve)
F
(O/D 3rd)
2.
Off-vehicle matrix chart
-
No-down shift
1.
Valve body assembly (2 - 3 shift valve)
F
(3rd 2nd)
2.
Off-vehicle matrix chart
-
No-down shift
1.
Valve body assembly (1 - 2 shift valve)
F
(2nd 1st)
2.
Off-vehicle matrix chart
-
Harsh engagement
1.
Valve body assembly (C2 accumulator)
F
(N R)
2.
Off-vehicle matrix chart
-
Harsh engagement
1.
Valve body assembly (C1 accumulator)
F
(N D)
2.
Off-vehicle matrix chart
-
1.
Valve body assembly (C1 accumulator)
F
Harsh engagement
2.
Valve body assembly (Low coast modulator valve)
F
(N L)
3.
Off-vehicle matrix chart
-
1.
Valve body assembly (Accumulator control valve)
F
Harsh engagement
2.
Valve body assembly (B2 accumulator)
F
(1st 2nd ”D” range)
3.
Off-vehicle matrix chart
-
1.
Valve body assembly (B2 accumulator)
F
Harsh engagement
2.
Valve body assembly (Accumulator control valve)
F
(1st 2nd ”2” range)
3.
Valve body assembly (2nd coast modulator control)
F
4.
Off-vehicle matrix chart
-
Harsh engagement
Valve body assembly (Primary regulator valve)
F
(1st 2nd 3rd O/D)
1. Valve body assembly (C2 accumulator)
F
Harsh engagement
2. Valve body assembly (Accumulator control valve)
F
(2nd 3rd)
3. Off-vehicle matrix chart
-
1. Valve body assembly (Accumulator control valve)
F
Harsh engagement
2. Valve body assembly (C3 accumulator)
F
(3rd O/D)
3. Off-vehicle matrix chart
-
Harsh engagement
1. Valve body assembly (B4 accumulator)
F
(O/D 3rd)
2. Off-vehicle matrix chart
-
Harsh engagement
1. Valve body assembly (C2 accumulator)
F
(3rd 2nd)
2. Off-vehicle matrix chart
-
1. Valve body assembly (Primary regulator valve)
F
Slip (Forward & Reverse)
2. Oil strainer
40-23
3. Off-vehicle matrix chart
-
Slip (”R” range, 1st, 2nd, 3rd, O/D)
Off-vehicle matrix chart
-
05-376
DIAGNOSTICS
- ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (April, 2003)
Symptom
Suspect Area
See page
1. Valve body assembly (Low coast modulator valve)
F
No engine braking (1st ”L” range)
2. Off-vehicle matrix chart
-
1. Valve body assembly (2nd coast modulator valve)
F
No engine braking (2nd ”2” range)
2. Off-vehicle matrix chart
-
1. Valve body assembly (1 - 2 shift valve)
F
No kick down
2. Valve body assembly (2 - 3 shift valve)
F
3. Valve body assembly (3 - 4 shift valve)
F
1. Valve body assembly (Primary regulator valve)
F
Poor acceleration
2. Off-vehicle matrix chart
-
1. Valve body assembly (Lock-up relay valve)
F
No lock-up
2. Off-vehicle matrix chart
-
DIAGNOSTICS
-
ELECTRONIC CONTROLLED AUTOMATIC
05-377
TRANSAXLE [ECT] (April, 2003)
Chapter 3: Off-vehicle repair
(F : A245E/A246E automatic transaxle repair manual Pub. No. RM941U)
Symptom
Suspect Area
See page
Does not move in any forward ranges
Forward clutch (C1)
F
1. Direct clutch (C2)
F
Does not move in reverse range
2.
1st and reverse brake (B3)
F
3. U/D brake (B4)
F
1. Torque converter clutch
40-20
2. Oil pump
F
Does not move in any ranges
3. U/D one-way clutch (F3)
F
4. Front planetary gear
F
5. Rear planetary gear
F
No-up shift
1.
2nd brake (B2)
F
(1st 2nd)
2. No.1 one-way clutch (F1)
F
No-up shift
Direct clutch (C2)
F
(2nd 3rd)
No-up shift
U/D clutch (C3)
F
(3rd O/D)
No-down shift
1. U/D brake (B4)
F
(O/D 3rd)
2. U/D one-way clutch (F3)
F
No-down shift
No.1 one-way clutch (F1)
F
(3rd 2nd)
No-down shift
No.2 one-way clutch (F2)
F
(2nd 1st)
Harsh engagement
1. Direct clutch (C2)
F
(N R)
2.
1st and reverse brake (B3)
F
Harsh engagement
1. Forward clutch (C1)
F
(N D)
2. On-vehicle matrix chart
-
Harsh engagement
Forward clutch (C1)
F
(N L)
Harsh engagement
1.
2nd brake (B2)
F
(1st 2nd ”D” range)
2. No.1 one-way clutch (F1)
F
1.
2nd coast brake (B1)
F
Harsh engagement
2.
2nd brake (B2)
F
(1st 2nd ”2” range)
3. No.1 one-way clutch (F1)
F
Harsh engagement
Direct clutch (C2)
F
(2nd 3rd)
Harsh engagement
U/D clutch (C3)
F
(3rd O/D)
Harsh engagement
U/D brake (B4)
F
(O/D 3rd)
Harsh engagement
Direct clutch (C2)
F
(3rd 2nd)
1. Torque converter clutch
40-20
Slip (Forward & Reverse)
2. Oil pump
F
1. Direct clutch (C2)
F
Slip (”R” range)
2.
1st and reverse brake (B3)
F
1. Forward clutch (C1)
F
Slip (1st)
2. No.2 one-way clutch (F2)
F
3. U/D one-way clutch (F3)
F
05-378
DIAGNOSTICS
- ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (April, 2003)
Symptom
Suspect Area
See page
1. Forward clutch (C1)
F
2.
2nd brake (B2)
F
Slip (2nd)
3. No.1 one-way clutch (F1)
F
4. U/D one-way clutch (F3)
F
1. Forward clutch (C1)
F
Slip (3rd)
2. Direct clutch (C2)
F
3. U/D one-way clutch (F3)
F
1. Forward clutch (C1)
F
Slip (O/D)
2. Direct clutch (C2)
F
3. U/D clutch (C3)
F
No engine braking (1st ”L” range)
1st and reverse brake (B3)
F
No engine braking (2nd ”2” range)
2nd coast brake (B1)
F
1. Torque converter clutch
40-20
Poor acceleration
2. Forward clutch (C1)
F
No lock-up
Torque converter clutch
40-20
Engine stalls when starting off or stopping
Torque converter clutch
40-20
05-362
DIAGNOSTICS
- ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (April, 2003)
05DTX-01
TERMINALS OF ECM
E3
E4
E5
E6
C95801
Symbols (Terminals No.)
Wiring Color
Terminal Description
Condition
Specified Condition
IG switch ON and O/D OFF indica-
Below 3 V
tor light lights up
O/D OFF indicator light
ODLP (E5-7) - E1 (E4-7)
LG - BR
circuit
IG switch ON and O/D OFF indica-
10 to 14 V
tor light goes off
IG switch ON and shift lever L posi-
10 to 14 V
L shift position switch sig-
tion
L (E5-8) - E1 (E4-7)
LG-B - BR
nal
IG switch ON and shift lever except
Below 1 V
L position
IG switch ON and shift lever 2 posi-
10 to 14 V
tion
2 shift position switch sig-
2 (E5-9) - E1 (E4-7)
LG - BR
nal
IG switch ON and shift lever except
Below 1 V
2 position
IG switch ON and shift lever R posi-
10 to 14 V
R shift position switch sig-
tion
R (E5-11) - E1 (E4-7)
R-B - BR
nal
IG switch ON and shift lever except
Below 1 V
R position
IG switch ON and Brake pedal is
7.5 to 14 V
depressed
STP (E5-19) - E1 (E4-7)
G-W - BR
Stop lamp switch si
gnal
IG switch ON and Brake pedal is
Below 1.5 V
released
IG switch ON and rotate driving
SPD (E5-17) - E1 (E4-7)
V-W - BR
Speed signal
Pulse generation
wheel slowly
IG switch ON
10 to 14 V
ODMS (E5-29) - E1 (E4-7)
LG-B - BR
O/D main switch signal
IG switch ON and press continu-
Below 1 V
ously O/D main switch
IG switch ON and shift lever P and
Below 1 V
N position
NSW (E4-8) - E1 (E4-7)
R - BR
Park neutral switch signal
IG switch ON and shift lever except
10 to 14 V
P and N position
IG switch ON
Below 1 V
SL (E4-13) - E1 (E4-7)
L-W - BR
SL solenoid signal
Vehicle driving under lock-up range
10 to 14 V
IG switch ON
10 to 14 V
S1 (E4-15) - E1 (E4-7)
R-Y - BR
S1 solenoid signal
1st or 2nd gear
10 to 14 V
3rd or O/D gear
Below 1 V
IG switch ON
Below 1 V
S2 (E4-14) - E1 (E4-7)
L - BR
S2 solenoid signal
1st or O/D gear
Below 1 V
2nd or 3rd gear
10 to 14 V
DIAGNOSTICS
-
ELECTRONIC CONTROLLED AUTOMATIC
05-363
TRANSAXLE [ECT] (April, 2003)
SLT+ (E3-17) - SLT- (E3-16)
R-W - P
SLT solenoid signal
IG switch ON
10 to 14 V
OD1 (E5-18)*1 - E1 (E4-7)
R-Y*1 - BR
O/D cancel signal
IG switch ON
10 to 14 V
*1: w/ Cruise control
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