Pinpoint Test E : DTC P065B: Notes
Diagnostic Overview
Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Service Information for more information.
Refer to Charging System , for schematic and connector information.
Normal Operation and Fault Conditions
With the engine running, the PCM monitors and expects to receive a valid generator monitor (GENMON) signal with a duty cycle greater than 5% and less than 98%. The PCM also monitors the state of the generator command (GENCMD) signal line to make sure it is not stuck high or stuck low. A DTC sets if the GENMON or GENCMD signal fluctuates between out-of-valid range, stuck high, stuck low, or some combination and normal the generator defaults to a steady voltage of 13.5 volts and the PCM sends a request to the IPC to illuminate the charging system warning indicator lamp.
Visual Inspection and Diagnostic Pre-checks
Before diagnosing or repairing the charging system inspect the following items:
- Fusible links
- Wiring, terminals or connectors
- High current BJB for loose or corroded connections
- Radial arm adapter
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P065B | Generator Control Circuit Range/Performance | The PCM sets this DTC if the input frequency was continuously less than 80 Hz or more than 200 Hz. Additionally, if the signal shows a faulted condition that is happening in a fluctuating manner, the PCM tracks the fluctuations between faulted and normal conditions. This DTC can also set if the fluctuations occur frequently within a short amount of time. |
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Radial arm adapter
- Generator
- PCM