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DI-174
DIAGNOSTICS - AUTOMATIC TRANSAXLE
DI6UM-02
DTC P0753, P0758 Shift Solenoid A/B Electrical Malfunc-
tion (Shift Solenoid Valve No.1/No.2)
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).
SHIFT SOLENOID VALVE SHIFT SOLENOID VALVE BOTH SHIFT SOLENOID
NORMAL NO. 1 MALFUNCTIONING NO. 2 MALFUNCTIONING VALVES MALFUNCTIONING
Range
Solenoid valve Solenoid valve Solenoid valve Gear when shift selector is
Gear Gear Gear manually operated
No. 1 No. 2 No. 1 No. 2 No. 1 No. 2
ON ON 1st X OFF 3rd ON X 2nd 3rd
ON OFF 2nd X OFF 3rd ON X 2nd 3rd
D
OFF OFF 3rd X OFF 3rd OFF X 3rd 3rd
OFF ON O/D X ON O/D OFF X 3rd 3rd
ON ON 1st X OFF 3rd ON X 2nd 3rd
2 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
L
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. DTC Detecting Condition Trouble Area
The ECM checks for an open or short circuit in the shift sole-
noid 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
S Open or short in shift solenoid valve No. 1/No. 2 circuit
P0753 (b) disappears.
S Shift solenoid valve No. 1/No. 2
P0758 After that, if the ECM detects condition (a) or (b) once, it starts
S ECM
lighting up MIL again.
(a) Solenoid resistance is 8 or less (short circuit) when the
solenoid is energized.
(b) Solenoid resistance is 100 k 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 send-
ing 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 3
W-G
E1 E5 S1
W
Shift Solenoid
Valve No. 2 10 9
W-R
E1 E5 S2
B
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.
S1 OK:
S2 Resistance: 11 - 15 at 20 ◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo