DESCRIPTION
The ECM constantly generates a 5 V power source voltage from the battery voltage supplied to the +B, +B2, +B3, +B4 (BATT) terminals to operate the microprocessor. The ECM also provides this power to the sensors through the VC output circuit.
When the VC circuit has a short circuit, the microprocessor in the ECM and sensors that are supplied power through the VC circuit are deactivated because power is not supplied from the VC circuit. When the system is in this condition, it will not start.
WIRING DIAGRAM
For the circuit diagram of the ECM power source refer to the ECM power source circuit.
VC Output Circuit
CAUTION / NOTICE / HINT
Note
Check the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
CHECK CONNECTION BETWEEN GTS AND ECM
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
| B |
|
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here |
| A |
|
CHECK EFI-B NO. 1 FUSE VOLTAGE
Turn the engine switch on (IG).
| *A | for LHD | *B | for RHD |
| *1 | No. 1 Engine Room Relay Block and Junction Block Assembly | *2 | EFI-B NO. 1 Fuse |
Measure the voltage according to the value(s) in the table below.
| Standard Voltage | ||||||
|---|---|---|---|---|---|---|
|
Tech Tips
Check the fuse with it installed to the No. 1 engine room relay block and junction block assembly.
If the result is not as specified, since current is not flowing to the +B terminals of the ECM, the system may not be started.
| Result | |||
|---|---|---|---|
|
| NG |
|
GO TO ECM POWER SOURCE CIRCUIT Click here |
| OK |
|
CHECK CONNECTION BETWEEN GTS AND ECM (THROTTLE POSITION SENSOR (BANK 1))
Disconnect the throttle body with motor assembly (bank 1) connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
Tech Tips
When cleaning or replacing one throttle body with motor assembly, clean the other throttle body with motor assembly.
Perform "Inspection After Repair" after replacing the throttle body with motor assembly.
| B |
|
REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY (BANK 1) Click here |
| A |
|
CHECK CONNECTION BETWEEN GTS AND ECM (THROTTLE POSITION SENSOR (BANK 2))
Disconnect the throttle body with motor assembly (bank 2) connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
Tech Tips
When cleaning or replacing one throttle body with motor assembly, clean the other throttle body with motor assembly.
Perform "Inspection After Repair" after replacing the throttle body with motor assembly.
Click here
| B |
|
REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY (BANK 2) Click here |
| A |
|
CHECK COMMUNICATION BETWEEN GTS AND ECM (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT OF BANK 1))
Disconnect the camshaft position sensor (for intake camshaft of bank 1) connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
| B |
|
REPLACE CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT OF BANK 1) Click here |
| A |
|
CHECK COMMUNICATION BETWEEN GTS AND ECM (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT OF BANK 2))
Disconnect the camshaft position sensor (for intake camshaft of bank 2) connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
| B |
|
REPLACE CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT OF BANK 2) Click here |
| A |
|
CHECK COMMUNICATION BETWEEN GTS AND ECM (CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT OF BANK 1))
Disconnect the camshaft position sensor (for exhaust camshaft of bank 1) connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
| B |
|
REPLACE CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT OF BANK 1) Click here |
| A |
|
CHECK COMMUNICATION BETWEEN GTS AND ECM (CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT OF BANK 2))
Disconnect the camshaft position sensor (for exhaust camshaft of bank 2) connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
| B |
|
REPLACE CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT OF BANK 2) Click here |
| A |
|
CHECK COMMUNICATION BETWEEN GTS AND ECM (FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE))
Disconnect the fuel pressure sensor (for high pressure side) connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
Tech Tips
Perform "Inspection After Repair" after replacing the fuel pressure sensor (for high pressure side).
| B |
|
REPLACE FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE) Click here |
| A |
|
CHECK COMMUNICATION BETWEEN GTS AND ECM (NO. 2 FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE))
Disconnect the No. 2 fuel pressure sensor (for low pressure side) connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
Tech Tips
Perform "Inspection After Repair" after replacing the No. 2 fuel pressure sensor (for low pressure side).
| B |
|
REPLACE NO. 2 FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE) Click here |
| A |
|
CHECK COMMUNICATION BETWEEN GTS AND ECM (NO. 2 TURBO PRESSURE SENSOR (BANK 1))
Disconnect the No. 2 turbo pressure sensor (bank 1) connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
| B |
|
REPLACE NO. 2 TURBO PRESSURE SENSOR (BANK 1) Click here |
| A |
|
CHECK COMMUNICATION BETWEEN GTS AND ECM (NO. 2 TURBO PRESSURE SENSOR (BANK 2))
Disconnect the No. 2 turbo pressure sensor (bank 2) connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
| B |
|
REPLACE NO. 2 TURBO PRESSURE SENSOR (BANK 2) Click here |
| A |
|
CHECK COMMUNICATION BETWEEN GTS AND ECM (VACUUM SENSOR ASSEMBLY (BANK 1))
Disconnect the vacuum sensor assembly (bank 1) connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
| B |
|
REPLACE VACUUM SENSOR ASSEMBLY (BANK 1) Click here |
| A |
|
CHECK COMMUNICATION BETWEEN GTS AND ECM (VACUUM SENSOR ASSEMBLY (BANK 2))
Disconnect the vacuum sensor assembly (bank 2) connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
| B |
|
REPLACE VACUUM SENSOR ASSEMBLY (BANK 2) Click here |
| A |
|
CHECK COMMUNICATION BETWEEN GTS AND ECM (NO. 1 TURBO PRESSURE SENSOR (BANK 1))
Disconnect the No. 1 turbo pressure sensor (bank 1) connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
| B |
|
REPLACE NO. 1 TURBO PRESSURE SENSOR (BANK 1) Click here |
| A |
|
CHECK COMMUNICATION BETWEEN GTS AND ECM (NO. 1 TURBO PRESSURE SENSOR (BANK 2))
Disconnect the No. 1 turbo pressure sensor (bank 2) connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
| B |
|
REPLACE NO. 1 TURBO PRESSURE SENSOR (BANK 2) Click here |
| A |
|
CHECK COMMUNICATION BETWEEN GTS AND ECM (WASTE GATE VALVE POSITION SENSOR (BANK 1))
Disconnect the waste gate valve actuator assembly (bank 1) connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
Tech Tips
Perform "Inspection After Repair" after replacing the turbocharger sub-assembly.
| B |
|
REPLACE WASTE GATE VALVE ACTUATOR ASSEMBLY (TURBOCHARGER SUB-ASSEMBLY) (BANK 1) Click here |
| A |
|
CHECK COMMUNICATION BETWEEN GTS AND ECM (WASTE GATE VALVE POSITION SENSOR (BANK 2))
Disconnect the waste gate valve actuator assembly (bank 2) connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
Tech Tips
Perform "Inspection After Repair" after replacing the turbocharger sub-assembly.
| B |
|
REPLACE WASTE GATE VALVE ACTUATOR ASSEMBLY (TURBOCHARGER SUB-ASSEMBLY) (BANK 2) Click here |
| A |
|
CHECK COMMUNICATION BETWEEN GTS AND ECM (BALL VALVE POSITION SENSOR)
Disconnect the water control valve connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
| B |
|
REPLACE WATER CONTROL VALVE Click here |
| A |
|
CHECK COMMUNICATION BETWEEN GTS AND ECM (MASS AIR FLOW METER SUB-ASSEMBLY (BANK 1))
Disconnect the mass air flow meter sub-assembly (bank 1) connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
Tech Tips
Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.
| B |
|
REPLACE MASS AIR FLOW METER SUB-ASSEMBLY (BANK 1) Click here |
| A |
|
CHECK COMMUNICATION BETWEEN GTS AND ECM (MASS AIR FLOW METER SUB-ASSEMBLY (BANK 2))
Disconnect the mass air flow meter sub-assembly (bank 2) connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
Tech Tips
Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.
| B |
|
REPLACE MASS AIR FLOW METER SUB-ASSEMBLY (BANK 2) Click here |
| A |
|
CHECK COMMUNICATION BETWEEN GTS AND ECM (CRANKSHAFT POSITION SENSOR)
Disconnect the crankshaft position sensor connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
| B |
|
REPLACE CRANKSHAFT POSITION SENSOR Click here |
| A |
|
CHECK COMMUNICATION BETWEEN GTS AND ECM (ACCELERATOR PEDAL POSITION SENSOR)
Disconnect the accelerator pedal sensor assembly connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
| B |
|
REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY Click here |
| A |
|
CHECK CONNECTION BETWEEN GTS AND ECM (NO. 3 TURBO PRESSURE SENSOR)
Disconnect the No. 3 turbo pressure sensor connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||||
|---|---|---|---|---|---|---|---|---|
|
| B |
|
CHECK COMMUNICATION BETWEEN GTS AND ECM (DIFFERENTIAL PRESSURE SENSOR (BANK 1)) Click here |
| C |
|
REPLACE NO. 3 TURBO PRESSURE SENSOR Click here |
| A |
|
CHECK HARNESS AND CONNECTOR
Disconnect the throttle body with motor assembly (bank 1) connector.
Disconnect the throttle body with motor assembly (bank 2) connector.
Disconnect the camshaft position sensor (for intake camshaft of bank 1) connector.
Disconnect the camshaft position sensor (for intake camshaft of bank 2) connector.
Disconnect the camshaft position sensor (for exhaust camshaft of bank 1) connector.
Disconnect the camshaft position sensor (for exhaust camshaft of bank 2) connector.
Disconnect the fuel pressure sensor (for high pressure side) connector.
Disconnect the No. 2 fuel pressure sensor (for low pressure side) connector.
Disconnect the vacuum sensor assembly (bank 1) connector.
Disconnect the vacuum sensor assembly (bank 2) connector.
Disconnect the No. 1 turbo pressure sensor (bank 1) connector.
Disconnect the No. 1 turbo pressure sensor (bank 2) connector.
Disconnect the No. 2 turbo pressure sensor (bank 1) connector.
Disconnect the No. 2 turbo pressure sensor (bank 2) connector.
Disconnect the waste gate valve actuator assembly (bank 1) connector.
Disconnect the waste gate valve actuator assembly (bank 2) connector.
Disconnect the water control valve connector.
Disconnect the mass air flow meter sub-assembly (bank 1) connector.
Disconnect the mass air flow meter sub-assembly (bank 2) connector.
Disconnect the crankshaft position sensor connector.
Disconnect the accelerator pedal sensor assembly connector.
Disconnect the No. 3 turbo pressure sensor connector.
Disconnect the ECM connectors.
Remove the EFI-MAIN NO. 1 relay and EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and junction block assembly.
Remove the EFI-MAIN NO. 2 relay from the No. 2 luggage room relay block and junction block assembly.
Tech Tips
Remove the EFI-MAIN NO. 2 and EFI-MAIN NO. 3 relays connected between the checked terminals as the coil inside the relay influences the measurement value.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
| Result | |||
|---|---|---|---|
|
| OK |
|
REPLACE ECM Click here |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
CHECK COMMUNICATION BETWEEN GTS AND ECM (DIFFERENTIAL PRESSURE SENSOR (BANK 1))
Disconnect the differential pressure sensor (bank 1) connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
| B |
|
REPLACE DIFFERENTIAL PRESSURE SENSOR (BANK 1) Click here |
| A |
|
CHECK COMMUNICATION BETWEEN GTS AND ECM (DIFFERENTIAL PRESSURE SENSOR (BANK 2))
Disconnect the differential pressure sensor (bank 2) connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
| B |
|
REPLACE DIFFERENTIAL PRESSURE SENSOR (BANK 2) Click here |
| A |
|
CHECK COMMUNICATION BETWEEN GTS AND ECM (OIL PRESSURE SENSOR)
Disconnect the oil pressure sender gauge assembly connector.
Turn the engine switch on (IG).
Turn the GTS on.
Check the communication between the GTS and ECM.
Tech Tips
It can be checked using the "Engine" item of the Data List.
| Result | ||||||
|---|---|---|---|---|---|---|
|
| B |
|
REPLACE OIL PRESSURE SENDER GAUGE ASSEMBLY Click here |
| A |
|
CHECK HARNESS AND CONNECTOR
Disconnect the throttle body with motor assembly (bank 1) connector.
Disconnect the throttle body with motor assembly (bank 2) connector.
Disconnect the camshaft position sensor (for intake camshaft of bank 1) connector.
Disconnect the camshaft position sensor (for intake camshaft of bank 2) connector.
Disconnect the camshaft position sensor (for exhaust camshaft of bank 1) connector.
Disconnect the camshaft position sensor (for exhaust camshaft of bank 2) connector.
Disconnect the fuel pressure sensor (for high pressure side) connector.
Disconnect the No. 2 fuel pressure sensor (for low pressure side) connector.
Disconnect the vacuum sensor assembly (bank 1) connector.
Disconnect the vacuum sensor assembly (bank 2) connector.
Disconnect the No. 1 turbo pressure sensor (bank 1) connector.
Disconnect the No. 1 turbo pressure sensor (bank 2) connector.
Disconnect the No. 2 turbo pressure sensor (bank 1) connector.
Disconnect the No. 2 turbo pressure sensor (bank 2) connector.
Disconnect the waste gate valve actuator assembly (bank 1) connector.
Disconnect the waste gate valve actuator assembly (bank 2) connector.
Disconnect the water control valve connector.
Disconnect the mass air flow meter sub-assembly (bank 1) connector.
Disconnect the mass air flow meter sub-assembly (bank 2) connector.
Disconnect the crankshaft position sensor connector.
Disconnect the accelerator pedal sensor assembly connector.
Disconnect the No. 3 turbo pressure sensor connector.
Disconnect the canister pump module connector.
Disconnect the differential pressure sensor (bank 1) connector.
Disconnect the differential pressure sensor (bank 2) connector.
Disconnect the oil pressure sender gauge assembly connector.
Disconnect the ECM connectors.
Remove the EFI-MAIN NO. 1 relay and EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and junction block assembly.
Remove the EFI-MAIN NO. 2 relay from the No. 2 luggage room relay block and junction block assembly.
Tech Tips
Remove the EFI-MAIN NO. 2 and EFI-MAIN NO. 3 relays connected between the checked terminals as the coil inside the relay influences the measurement value.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
| Result | |||
|---|---|---|---|
|
| OK |
|
REPLACE ECM Click here |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |