Diagnostic Instructions
DTC Descriptors
DTC P1640: Control Module Output A Circuit
DTC P1650: Control Module Output B Circuit
DTC P1660: Control Module Output C Circuit
Circuit/System Description
The output driver module (ODM) is a control chip inside of the powertrain control module (PCM). The PCM contains multiple ODMs. ODMs provide grounded output control of devices. Each ODM output has an internal feedback circuit that connects to the PCM microprocessor.
The PCM monitors voltage through the ignition 1 voltage circuit. Excessive voltage or current may cause damage to the PCM.
Conditions for Running the DTC
| • | The system voltage is between 9-11 volts. |
Conditions for Setting the DTC
| • | The PCM has detected a voltage greater than 26.5 volts. |
| • | Excessive current is detected on any circuit to the ODM. |
| • | The above conditions are present for 30 seconds. |
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp
(MIL) on the second consecutive ignition cycle that the diagnostic runs and
fails. |
| • | The control module records the operating conditions at the time
the diagnostic fails. The first time the diagnostic fails, the control module
stores this information in the Failure Records. If the diagnostic reports
a failure on the second consecutive ignition cycle, the control module
records the operating conditions at the time of the failure. The control
module writes the operating conditions to the Freeze Frame and updates
the Failure Records. |
Conditions for Clearing the DTC
| • | A current DTC Last Test Failed clears when the diagnostic runs
and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles,
if no failures are reported by this or any other non-emission related diagnostic. |
| • | Clear the DTC with a scan tool. |
Diagnostic Aids
A condition with the charging system may cause this DTC to set. Refer to
Charging System Test
.
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Electrical Information Reference
Scan Tool Reference
Scan Tool Data List
Circuit/System Verification
With the ignition ON, observe the Output Driver Status with a scan tool. All parameters should indicate OK or no fault present.
Circuit/System Testing
- Observe the scan tool for any other DTCs.
| ⇒ | If DTC P0560 is also set, refer to
DTC P0560
to repair the charging system. |
- Observe the Output Driver Status with a scan tool.
| ⇒ | If any parameter does NOT indicate OK, test for a short to voltage on the control circuit of the component that indicated a fault. |
| ⇒ | If all circuits test OK, replace the PCM. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Control Module References
for PCM replacement, programming, and setup
