2. Gear. Solenoid valve. No. 1. No. 2. Gear. Gear when shift selector is ... Manual shifting as shown in the above table must be done (In the case of a short circuit, the ECM stops send- ... Repair or replace the harness or connector (See.Missing:
CIRCUIT DESCRIPTION Shifting from 1st to O/D is performed in combination with ON and OFF of the shift solenoid valve No. 1 and No. 2 controlled by ECM. If an open or short circuit occurs in either of the solenoid valves, the ECM controls the remaining normal solenoid valve to allow the vehicle to be operated smoothly (Fail safe function). NORMAL Range
D
2
L
Solenoid valve No. 1 No. 2 ON ON
Gear 1st
SHIFT SOLENOID VALVE NO. 1 MALFUNCTIONING
SHIFT SOLENOID VALVE NO. 2 MALFUNCTIONING
Solenoid valve No. 1 No. 2 OFF X
Solenoid valve No. 1 No. 2 X ON
ON
OFF
2nd
X
OFF
OFF OFF
OFF
3rd
X
ON
O/D
ON
ON
1st
Gear 3rd
BOTH SHIFT SOLENOID VALVES MALFUNCTIONING
Gear
Gear when shift selector is manually operated
2nd
3rd
X
2nd
3rd
X
3rd
3rd
X
3rd
3rd
ON
X
2nd
3rd
3rd
ON
OFF
3rd
OFF
X
ON
O/D
OFF
X
OFF
3rd
ON
OFF
2nd
X
OFF
3rd
ON
X
2nd
3rd
OFF
OFF
3rd
X
OFF
3rd
OFF
X
3rd
3rd
ON
ON
1st
X
OFF
3rd
ON
X
2nd
3rd
ON
OFF
2nd
X
OFF
3rd
ON
X
2nd
3rd
X: Malfunctions
HINT: Check the sift solenoid valve No. 1 when DTC P0753 is output and check the shift solenoid valve No. 2 when DTC P0758 is output. DTC No.
P0753 P0758
DTC Detecting Condition The ECM checks for an open or short circuit in the shift solenoid valve No. 1/No. 2 circuit when it changes. The ECM records DTC P0753 or P0758 if condition (a) or (b) is detected once, but it does not blink the MIL After ECM detects condition (a) or (b) continuously 2 times or more in 1-trip, it causes the MIL to light up until condition (a) or (b) disappears. After that, if the ECM detects condition (a) or (b) once, it starts lighting up MIL again.
Trouble Area
Open or short in shift solenoid valve No. 1/No. 2 circuit Shift solenoid valve No. 1/No. 2 ECM
(a) Solenoid resistance is 8 Ω or less (short circuit) when the solenoid is energized. (b) Solenoid resistance is 100 kΩ or more (open circuit) when the solenoid is not energized.
Fail safe function: If either of the solenoid valve circuits develops an open or short, the ECM turns the other solenoid valve ON and OFF to shift to the gear positions shown in the table above. The ECM also turns the shift solenoid valve ST OFF at the same time. If both solenoids malfunction, hydraulic control cannot be performed electronically and must be done manually. Manual shifting as shown in the above table must be done (In the case of a short circuit, the ECM stops sending current to the short circuited solenoid).
2002 ECHO (RM884U)
Author:
Date:
344
DI-175 DIAGNOSTICS
-
AUTOMATIC TRANSAXLE
WIRING DIAGRAM
Transaxle
ECM
Shift Solenoid Valve No. 1
5 E1
W
Shift Solenoid Valve No. 2 10 E1 B
W-G
3 E5 S1
W-R
9 E5 S2
D07912
INSPECTION PROCEDURE 1
Measure resistance between terminal S1 or S2 of ECM and body ground. PREPARATION: Disconnect the connector from ECM. CHECK: Measure resistance between terminal S1 or S2 of ECM and body ground. OK: Resistance: 11 - 15 Ω at 20 °C (68 °F)
S1 S2 D05640
OK
Check and replace the ECM (See page IN-29 ).
NG
2002 ECHO (RM884U)
Author:
Date:
345
DI-176 DIAGNOSTICS
2
-
AUTOMATIC TRANSAXLE
Measure harness and connector between ECM and automatic transmission solenoid connector. PREPARATION: Disconnect the solenoid connector from the automatic transaxle. CHECK: Measure the harness and connector between terminal S1 or S2 of ECM and terminal S1 or S2 of solenoid connector. OK: Resistance: 0 Ω
S1
S1
S2
S2 D08439
NG
Repair or replace the harness or connector (See page IN-29 ).
OK
3
Check connection of the connectors.
NG
Connect the connectors correctly.
OK
2002 ECHO (RM884U)
Author:
Date:
346
DI-177 DIAGNOSTICS
4
-
AUTOMATIC TRANSAXLE
Check shift solenoid valve No. 1 or No. 2.
No. 1
PREPARATION: (a) Jack up the vehicle. (b) Remove the oil pan. (c) Disconnect the solenoid connector. (d) Remove the shift solenoid valve No. 1 or No. 2. CHECK: Measure resistance between solenoid connector and body ground. OK: Resistance: 11 - 15 Ω at 20 °C (68 °F)
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