HH75 Check Operation of EGR Check Solenoid Valve

HH75 CHECK OPERATION OF EGR CHECK SOLENOID VALVE


- Key off.
- Breakout box installed, PCM connected.
- Disconnect the vacuum line from the EGR Check solenoid to the intake manifold vacuum reservoir at the EGR Check solenoid.
- Install vacuum pump at the input port of the EGR Check solenoid, apply 27 to 33 kPa (5 to 10 in. Hg) of vacuum.
- Disconnect the vacuum line from the EGR Check solenoid to the EGR Barometric Pressure sensor at the EGR Barometric Pressure sensor. Inspect vacuum line for damage, service as necessary.
- Install a vacuum gauge at the unattached end of the vacuum line.
- Key on.
- Jumper Test Pin 98 (EGRC) to ground at the breakout box and observe the vacuum gauge. Remove jumper.
- Apply 27 to 33 kPa (8 to 10 in. Hg) of vacuum to the EGR Check solenoid once again.
- Again, jumper Test Pin 98 (EGRC) to ground at the breakout box and observe the vacuum gauge. Remove jumper.
- key off.






Was a vacuum signal indicated at any time by the vacuum gauge?