DESCRIPTION
Detection Item |
Symptoms |
Trouble Area |
---|---|---|
Certification ECU Communication Stop Mode |
Either condition is met:
|
|
HINT:
For vehicles with a smart key system only.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
PROCEDURE
1. |
DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL |
(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire or branch wire.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable
is reconnected (See page ).
|
2. |
CHECK FOR OPEN IN CAN BUS WIRE (CERTIFICATION ECU BRANCH WIRE) |
(a) Disconnect the F79 certification ECU connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
F79-9 (CANH) - F79-10 (CANL) |
Ignition switch off |
54 to 69 Ω |
*a |
Rear view of wire harness connector (to Certification ECU) |
NG | ![]() |
REPAIR OR REPLACE CERTIFICATION ECU BRANCH WIRE OR CONNECTOR (CANH, CANL) |
|
3. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - BATTERY AND BODY GROUND) |
(a) Connect the cable to the negative (-) battery terminal. NOTICE: When disconnecting the cable, some systems need to be initialized after
the cable is reconnected (See page |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F79-15 (E) - Body ground |
Always |
Below 1 Ω |
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
F79-1 (+B) - Body ground |
Always |
11 to 14 V |
F79-16 (IG) - Body ground |
Ignition switch ON |
11 to 14 V |
F79-17 (CUTB) - Body ground |
Always |
11 to 14 V |
*a |
Rear view of wire harness connector (to Certification ECU) |
OK | ![]() |
REPLACE CERTIFICATION ECU |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1) (P0748)
DESCRIPTION
Shifting from 1st to 5th is performed in combination with the ON and OFF operation
of the shift solenoid valves SL1, SL2, S1, S2 and SR, which are controlled by the
ECM. If an open or short circuit occurs in one of the shift solenoid valves, t ...
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT GARAGE DOOR OPENER
(a) Press each switch and check that the red LED turns on. If one or
more of the switches does not turn on the LED, confirm normal operation
of the fuse and wire harness. If th ...