Chart 5
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- Unique Idle Concern: Slow Return to Idle, Fast Idle
Carry out the following preliminary checks:
- PCM system check.
- Accelerator pedal for binding, broken return spring, stuck condition (floor mats).
- External fuel source.
- Engine not reaching normal operating temperature.
- Power take-off (PTO), auxiliary idle control, and charge protect devices disengaged.
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TESTS - 6.0L DIESEL unless noted) |
|---|---|
| Check Accelerator Pedal | REPAIR if needed. |
| Check Crankcase Oil Level | If overfilled, DRAIN the crankcase to the correct level. DETERMINE cause of overfill. |
| Check Engine Oil | If there is coolant or fuel contamination in the engine oil, REPAIR as necessary. |
| Check For Fuel Contamination | CARRY OUT the SUFFICIENT CLEAN FUEL Test. |
| Check Parameter Identification (PIDS) | GO to DIAGNOSTIC METHODS PARAMETER IDENTIFICATION (PID) . SELECT Parameter Identification (PID). WARM engine to normal operating temperature. SELECT the engine oil temperature (EOT) PID. If EOT value is less than 38°C (100°F), INSTALL a new EOT sensor. |
| Check Turbocharger Ducting | REMOVE the turbocharger inlet air duct. INSPECT for debris/contamination. |
| Check EGR Operation | CARRY OUT the EXHAUST GAS RECIRCULATION (EGR) POSITION Test. |
| Check for Biased ICP Sensor | GO to Pinpoint Test Q . |