DESCRIPTION
When the ignition switch is turned to ON, voltage from the ECM's MREL terminal is applied to the EFI MAIN relay. This causes the contacts of the EFI MAIN relay to close, which supplies power to terminal +B of the TCM.
WIRING DIAGRAM
PROCEDURE
1. |
CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND) |
(a) Turn the ignition switch off. |
|
(b) Disconnect the TCM connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
B40-8 (E1) - Body ground |
Always |
Below 1 Ω |
*1 |
Front view of wire harness connector (to TCM) |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
2. |
INSPECT ECU TERMINAL VOLTAGE (+B TERMINAL) |
(a) Disconnect the TCM connectors. |
|
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
B40-18 (+B) - Body ground |
Ignition switch ON |
11 to 14 V |
*1 |
Front view of wire harness connector (to TCM) |
OK | ![]() |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
3. |
CHECK HARNESS AND CONNECTOR (TCM - ENGINE ROOM JUNCTION BLOCK ASSEMBLY) |
(a) Turn the ignition switch off.
(b) Disconnect the TCM connector.
(c) Remove the engine room junction block assembly from the engine room relay block.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
Tester Connection |
Condition |
Specified Condition |
---|---|---|
B40-18 (+B) - 1F-18 (+B) |
Always |
Below 1 Ω |
Standard Resistance (Check for Short):
Tester Connection |
Condition |
Specified Condition |
---|---|---|
B40-18 (+B) or 1F-18 (+B) - Body ground |
Always |
10 kΩ or higher |
*1 |
Engine Room Junction Block Assembly |
*2 |
Front view of wire harness connector (to Engine Room Junction Block Assembly) |
*3 |
Front view of wire harness connector (to TCM) |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY |
(a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
OK | ![]() |
GO TO ECM POWER SOURCE CIRCUIT (ENGINE CONTROL SYSTEM / SFI SYSTEM) |
NG | ![]() |
REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY |
System Diagram
SYSTEM DIAGRAM
Communication Table
Transmitting ECU (Transmitter)
Receiving ECU (Receiver)
Signal
Line
Main body ECU
(Driver side junction block assembly)
Power Back Door ECU
(P ...
Certification Ecu
Components
COMPONENTS
ILLUSTRATION
Removal
REMOVAL
PROCEDURE
1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-)
battery terminal to disable the SRS system.
N ...
Dtc Check / Clear
DTC CHECK / CLEAR
1. CHECK DTC
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / (desired system) / Trouble Codes.
(e) Check for DTCs.
2. CLEAR DTC
( ...