Solenoid and Solenoid Driver

Figure 3-16: Fuel Solenoid Driver Replacement:

Fuel Solenoid and Solenoid Driver

The solenoid and driver provide the fuel injection metering to the individual injectors. The driver receives the PCM command and transmits it to the solenoid which controls the actual injection process.

The solenoid driver also returns a pulse width signal back to the PCM. This signal informs the PCM that injection has taken place. The pulse width signal time is in milliseconds.

A fault in either component will cause an injection pulse width.

Fuel Solenoid Driver Replacement

Removal
1. Drain the engine coolant and remove the upper radiator hose from the thermostat housing.
2. Remove the left intake manifold runner to gain access to the Fuel Solenoid Driver (on the left side of the injection pump).
3. Scribe a reference mark on the engine front cover and the injection pump housing to assist in correctly locating the Injection Pump during reassembly.
4. Loosen the Injection Pump retaining nuts approximately 1/2 turn, using Injection Pump Timing Wrench J 41711 (do not remove the nuts).
5. Rotate the Injection Pump toward the passenger side of the vehicle until it stops, using Injection Pump Adjusting tool J-33042, and re-tighten the top Injection Pump retaining nut.
6. Disconnect the wiring connector at the Fuel Solenoid Driver (Figure 3-16).
7. Loosen the four Fuel Solenoid Driver mounting screws until they are free of the injection pump housing, using a T 15 Torx bit.
8. Remove the mounting screws, Fuel Solenoid Driver and the heat transfer pad from the Injection Pump. Discard the heat transfer pad and the mounting screws.
9. Remove the calibrating resistor (Figure 3-17) from the Fuel Solenoid Driver using special pliers (Klein D319B or Stanadyne 30858).

CAUTION:
- The Calibrating Resistor is specific to the injection pump. Do not damage the resistor. The calibrating resistor identification number is located on the front of the Calibrating Resistor (Figure 3-17).
- If the Calibrating Resistor is damaged or lost, the Injection Pump must be removed for replacement or taken to a Stanadyne dealer for calibration. If the Calibrating Resistor is missing a DTC P1218 will set.

Figure 3-17: Calibrating Resister Transfer:

Installation
1. Install the calibrating resistor in the new Fuel Solenoid Driver using the special pliers (Figure 3-17).
2. Place the new heat transfer pad on the side of the Fuel Solenoid Driver and insert the mounting screws through the driver and the pad.
3. Align the Fuel Solenoid Driver mounting screws with the holes in the pump housing and tighten to 23 lb-in (2.75 N.m).

CAUTION:
- Do not install the Fuel Solenoid Driver without the heat transfer pad. Do not reuse a heat transfer pad. Use a new heat transfer pad only. The heat transfer pad is required to prevent overheating and rapid failure of the Fuel Solenoid Driver.
- Do not overtighten the Fuel Solenoid Driver mounting screws. Damage to the Fuel Solenoid Driver will result.

4. Connect the Fuel Solenoid Driver wiring harness connector.
5. Loosen the upper Injection Pump retaining nut approximately 1/2 turn (do not remove the nut).
6. Rotate the Injection Pump back to it s original position, using the reference marks made previously and tighten the Injection Pump retaining nuts.
7. Install the intake manifold runner.
8. Connect the upper radiator hose to the thermostat housing and fill the coolant system.
9. Perform the Injection Timing Adjustment Procedure.