910103-0525 Tohatsu BOLT

The following background information is related to this procedure:Suction Control Valve (SCV) for the High-Pressure Fuel PumpThe high-pressure fuel pump is equipped with a suction control valve. The suction control valve precisely controls the amount of fuel that enters the high-pressure fuel pump.The amount of fuel that is required is calculated by the software that is contained in the ECM. The solenoid in the suction control valve is controlled by a PWM signal from the ECM.
Illustration 1 g03840648
Schematic for the suction control valve solenoid
Illustration 2 g03841114
Typical example of the high-pressure fuel pump
(1) Solenoid for the Suction Control Valve (SCV)
Illustration 3 g03841117
Connector for the SCV solenoid
(1) Signal
(2) Return
Table 2
Troubleshooting Test Steps Values Results
1. Inspect Electrical Connectors and Wiring
A. Thoroughly inspect the terminal connections on the P1/J1 ECM connector and the SCV solenoid. Refer to Troubleshooting, "Electrical Connectors - Inspect".
B. Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the active diagnostic code.
C. Perform a 45 N (10 lb) pull test on each of the wires in the solenoid connectors that are associated with the active diagnostic code.
D. Check the harness for corrosion, abrasion, and pinch points from the solenoids to the ECM.
Loose connection or damaged wire
Result: There is a fault in a connector or the wiring.
Repair: Repair any faulty connectors or replace the wiring harness. Ensure that all the seals are properly in place and ensure that the connectors are correctly coupled.
Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.
Result: All connectors, pins, and sockets are correctly coupled and/or inserted. The harness is free of corrosion, abrasion, and pinch points.
Proceed to Test Step 2.
2. Check for Active Diagnostic Codes
A. Turn the keyswitch to the OFF position.
B. Connect the electronic service tool to the diagnostic connector.
C. Turn the keyswitch to the ON position. Wait at least 20 seconds for activation of the diagnostic codes.
D. Verify if any of the diagnostic codes that are listed in Table 1 are active.
E. Turn the keyswitch to the OFF position.
Diagnostic codes
Result: No diagnostic codes are active.
Return the unit to service.
Result: A 1347-X diagnostic code is active.
Proceed to Test Step 3.
3. Check the SCV Solenoid
A. Turn the keyswitch to the OFF position.
B. Disconnect the connector for the SCV solenoid.
C. Measure the resistance between pins 1 and 2 on the SCV solenoid.
D. Reconnect the connector to the SCV solenoid.
2.0 Ohms to 4.0 Ohms
Result: The measured resistance is outside the range of 2.0 Ohms to 4.0 Ohms.
Repair: Install a replacement high-pressure fuel pump.
Turn the keyswitch to the ON position. Use the electronic service tool to check for active diagnostic codes. Wait at least 30 seconds in order for the codes to be displayed.
Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.
Result: The measured resistance is within the range of 2.0 Ohms to 4.0 Ohms.
Proceed to Test Step 4.
4. Check the Wiring for an Open Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the SCV solenoid harness connector.
C. Disconnect the engine interface connector.
D. Disconnect the P1 connector from the ECM.
E. Check the resistance between the following pins:
Pin 1 on the SCV solenoid harness connector and pin 35 on the solenoid side of the engine interface connector.
Pin 2 on the SCV solenoid harness connector and pin 34 on the solenoid side of the engine interface connector.
Pin 35 on the ECM side of the engine interface connector and P1:20.
Pin 34 on the ECM side of the engine interface connector and P1:7.
B. Reconnect the SCV solenoid harness connector.
G. Reconnect the engine interface connector.
H. Reconnect the P1 connector to the ECM.
Less than 2.0 Ohms
Result: One of the measured resistances is greater than 2.0 Ohms. There is a fault in the engine wiring harness.
Repair: Repair the engine wiring harness or replace the engine wiring harness.
Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.
Result: All measured resistances are less than 2.0 Ohms.
Proceed to Test Step 5.
5. Check the Wiring for a Short Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the SCV solenoid harness connector.
C. Disconnect the engine interface connector.
D. Disconnect the P1 connector from the ECM.
E. Check the resistance between t