Diagnostic Test
WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
- ACTIVE DTC
- Turn the ignition on.
- With the scan tool, erase DTCs.
- Turn the ignition off for 75 seconds.
- Start the engine and let idle for up to five minutes.
- With the scan tool, read DTCs.
Did the DTC reset?
Yes
- Go To 2.
No
- Perform the INTERMITTENT CONDITION - 6.7L diagnostic procedure. Refer to INTERMITTENT CONDITION - 6.7L .
- CHECK THE (K20) GENERATOR FIELD CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
- CHECK THE GENERATOR FOR A SHORT TO VOLTAGE
- Disconnect the Generator field harness connector.
- Turn the ignition on.
- Measure the voltage on the (K20) Generator Field Control circuit at the Generator harness connector.
Is there any voltage present?
Yes
- Repair the (K20) Generator Field Control circuit for a short to voltage.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
No
- Replace the Generator in accordance with the service information.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
- CHECK THE (K20) GENERATOR FIELD CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE
- Disconnect the Generator field harness connector.
- Measure the resistance of the (K20) Generator Field Control circuit between the Generator harness connector and the PCM C1 harness connector.
Is the resistance below 5.0 Ohms?
Yes
- Replace the Powertrain Control Module in accordance with the service information.
- Perform the POWERTRAIN VERIFICATION TEST TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
No
- Repair the (K20) Generator Field Control circuit for an open or high resistance.
- Perform the POWERTRAIN VERIFICATION TEST TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .