12a. Low Idle Stability (ICP Pressure): Purpose:
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The purpose of this test is to determine if idle stability or low power is caused by a stuck or dirty injection pressure regulator (IPR) or faulty ICP signal.
Low Idle Stability (ICP Pressure)
- Check at low idle and EOT above 70°C (158° F)
- Monitor the ICP and RPM PIDS with the scan tool.
| Parameter | Specification at 670 RPM | Measurement |
|---|---|---|
| ICP | 4.0 - 5.0 MPa ± 0.3 MPa (580-725 psi ±45 psi) | |
| Take reading before disconnecting ICP sensor. | ||
If engine RPM is unstable, disconnect the ICP sensor.
- ICP defaults to 6.0 MPa (870 psi) when disconnected.
- If RPM smooths out, the ICP sensor or circuit is suspect.
- If RPM is still unstable, connect the ICP sensor and go to step 12b.