DESCRIPTION
1. w/o Smart Key System
When the engine is cranked, the starter relay drive signal output from the ignition switch is input into the STA terminal of the ECM, and the NE signal generated by the crankshaft position sensor is also input into the NE+ terminal. When the ECM interprets that the engine is cranked, it turns transistor Tr1 in the ECM internal circuit on. The current flows to the C/OPN (Circuit Opening) relay when Tr1 is turned on. Then, the fuel pump operates.
While the NE signal is input into the ECM when the engine is running, the ECM turns Tr1 on continuously.
2. w/ Smart Key System
When the engine is cranked, the starter relay drive signal output from the STAR terminal of the power management control ECU is input into the STA terminal of the ECM, and the NE signal generated by the crankshaft position sensor is also input into the NE+ terminal. When the ECM interprets that the engine is cranked, it turns transistor Tr1 in the ECM internal circuit on. The current flows to the C/OPN (Circuit Opening) relay when Tr1 is turned on. Then, the fuel pump operates.
While the NE signal is input into the ECM when the engine is running, the ECM turns Tr1 on continuously.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
1. |
PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVE THE FUEL PUMP SPEED CONTROL) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON and turn the Techstream on.
(c) Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump / Speed.
(d) Check whether the fuel pump operating sound occurs when performing the Active Test on the Techstream.
OK:
Fuel pump operating sound occurs.
OK | ![]() |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
2. |
INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY (C/OPN RELAY) |
(a) Inspect the C/OPN relay (See page ).
NG | ![]() |
REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY |
|
3. |
CHECK HARNESS AND CONNECTOR (C/OPN RELAY - ECM) |
(a) Disconnect the ECM connector.
(b) Remove the engine room junction block assembly from the engine room relay block.
(c) Disconnect the engine room junction block assembly connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
Tester Connection |
Condition |
Specified Condition |
---|---|---|
1F-3 - A49-8 (FC) |
Always |
Below 1 Ω |
Standard Resistance (Check for Short):
Tester Connection |
Condition |
Specified Condition |
---|---|---|
1F-3 or A49-8 (FC) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR (C/OPN RELAY - ECM) |
|
4. |
INSPECT ENGINE ROOM RELAY BLOCK (IG2 RELAY - C/OPN RELAY) |
(a) Remove the IG2 relay from the engine room relay block.
(b) Remove the engine room junction block assembly from the engine room relay block.
(c) Disconnect the engine room junction block assembly connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
Tester Connection |
Condition |
Specified Condition |
---|---|---|
1F-2 - 5 (IG2 relay terminal) |
Always |
Below 1 Ω |
Standard Resistance (Check for Short):
Tester Connection |
Condition |
Specified Condition |
---|---|---|
1F-2 or 5 (IG2 relay terminal) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 RELAY - C/OPN RELAY) |
|
5. |
CHECK HARNESS AND CONNECTOR (C/OPN RELAY - FUEL PUMP) |
(a) Remove the engine room junction block assembly from the engine room relay block.
(b) Disconnect the engine room junction block assembly connector.
(c) Disconnect the fuel pump connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
Tester Connection |
Condition |
Specified Condition |
---|---|---|
1F-10 - L12-4 |
Always |
Below 1 Ω |
Standard Resistance (Check for Short):
Tester Connection |
Condition |
Specified Condition |
---|---|---|
1F-10 or L12-4 - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR (C/OPN RELAY - FUEL PUMP) |
|
6. |
CHECK HARNESS AND CONNECTOR (FUEL PUMP - BODY GROUND) |
(a) Disconnect the fuel pump connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
L12-5 - Body ground |
Always |
Below 1 Ω |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL PUMP - BODY GROUND) |
|
7. |
INSPECT FUEL PUMP |
(a) Inspect the fuel pump (See page ).
HINT:
Perform "Inspection After Repair" after replacing the fuel pump (See page
).
OK | ![]() |
REPLACE ECM |
NG | ![]() |
REPLACE FUEL PUMP |
Removal
REMOVAL
PROCEDURE
1. REMOVE UPPER CONSOLE PANEL SUB-ASSEMBLY (w/o Seat Heater System)
2. REMOVE UPPER CONSOLE PANEL SUB-ASSEMBLY (w/ Seat Heater System)
3. REMOVE NO. 2 CONSOLE BOX CARPET
4. REMOVE CONSOLE BOX ASSEMBLY
5. REMOVE AIR CONDITION ...
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
Use the table below to help determine the cause of problem symptoms.
If multiple suspected areas are listed, the potential causes of the symptoms
are listed in order of probability in the "Suspected Area" column ...
Operation Check
OPERATION CHECK
1. AUTOMATIC LIGHT CONTROL SYSTEM OPERATION CHECK
(a) Turn the ignition switch to ON.
(b) Turn the light control switch to the AUTO position.
(c) Cover the automatic light control sensor.
(d) Check that the taillights and low beam headligh ...