DTC 18 (5) Spill Control Circuit Malfunction
DESCRIPTION
The ECM operates the spill control valve to control the fuel injection volume. The spill control valve is mounted on the injection pump. The spill control valve's solenoid valve opens and closes the injection pressure release port. During fuel injection, the spill control valve is on (closed). The ECM determines the basic fuel injection amount based on the engine speed and accelerator pedal position. Then the ECM uses several other correctional factors to determine the final fuel injection amount. After fuel injection has begun, the ECM ensures the final fuel injection amount by performing the following: 1) by counting the number of NE signals, and 2) by turning the spill control valve from on (closed) to off (open) (injection pressure release port is open).
| DTC No. | DTC Detection Condition | Trouble Area |
| 18 (5) | Open or short in the spill control valve circuit at 500 rpm or more. | Open or short in spill control valve circuit
Spill control valve
ECM
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WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.INSPECT SPILL CONTROL VALVE |
Inspect the spill control valve (See page ).
| | REPLACE INJECTION PUMP ASSEMBLY
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| 2.CHECK ECM (SPV+ VOLTAGE) |
Disconnect the spill control valve connector.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| C101-12 (SPV+) - C101-14 (E1) | Ignition switch ON | 11 to 14 V |
Text in Illustration| *a | Component with harness connected
(ECM) |
Reconnect the spill control valve connector.
| 3.CHECK ECM (SPV- VOLTAGE) |
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| C101-25 (SPV-) - C101-14 (E1) | Ignition switch ON | 11 to 14 V |
While idling, check the waveform with an oscilloscope connected between the specified terminals of the ECM connector.
- OK:
| Tester Connection | Condition | Specified Condition |
| C101-25 (SPV-) - C101-14 (E1) | Idling | Correct waveform is as shown |
Text in Illustration| *a | Component with harness connected
(ECM) |
| *b | SPV- signal waveform |
| OK | |
| |
| CHECK FOR INTERMITTENT PROBLEMS
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| 4.CHECK HARNESS AND CONNECTOR (ECM - SPILL CONTROL VALVE) |
Disconnect the spill control valve connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Open):
| Tester Connection | Condition | Specified Condition |
| C106-2 - C101-12 (SPV+) | Always | Below 1 Ω |
| C106-1 - C101-25 (SPV-) | Always | Below 1 Ω |
- Standard Resistance (Check for Short):
| Tester Connection | Condition | Specified Condition |
| C106-2 or C101-12 (SPV+) - Body ground | Always | 10 kΩ or higher |
| C106-1 or C101-25 (SPV-) - Body ground | Always | 10 kΩ or higher |
Reconnect the spill control valve connector.
Reconnect the ECM connector.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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