Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC P0801: Reverse Lockout Solenoid Control CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ Circuit to Reverse Lockout Solenoid | P0801 | P0801 | -- | -- |
Reverse Lockout Solenoid Control Circuit | P0801 | P0801 | P0801 | -- |
Typical Scan Tool Data
Display Parameters | Normal Range | Short to Ground | Open/High Resistance | Short to Voltage |
|---|---|---|---|---|
Operating Conditions: Engine Running. Parameter Normal Range: ON or OFF. | ||||
Reverse Inhibit Solenoid Command | ON/OFF | OFF | OFF | OFF |
Circuit/System Description
Battery Voltage (B+) is supplied directly to the reverse lockout solenoid. The engine control module (ECM) controls the reverse lockout solenoid by grounding the control circuit via an internal switch called a low side driver. The low side driver has a fault line which monitors the control circuit. When the ECM commands the reverse lockout solenoid ON, the voltage should be low, near zero volts. When the ECM commands the reverse lockout solenoid OFF, the voltage should be high, near battery voltage.
Conditions for Running the DTC
| • | The engine is running. |
| • | The vehicle speed is less than 3 km/h (2 mph). |
Conditions for Setting the DTC
| • | The ECM detects that the commanded state of the driver and the actual state of the control circuit does not match. |
| • | The condition exists for 2 seconds. |
Action Taken When the DTC Sets
P0801 is a Type C DTC.
Conditions for Clearing the DTC
P0801 is a Type C DTC.
Diagnostic Aids
| • | The battery must be fully charged and pass a battery test. Refer to Battery Inspection/Test. |
| • | The reverse lockout solenoid is referred to as the reverse inhibit solenoid on the scan tool. |
Reference Information
Schematic Reference
Manual Transmission Schematics
Connector End View Reference
Manual Transmission Connector End Views
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
- Engine running, the reverse lockout solenoid parameter should display OFF.
- Road test the vehicle at 16 km/h (10 mph). The reverse lockout solenoid parameter should display ON.
- Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Circuit/System Testing
- Ignition OFF, disconnect the reverse lockout solenoid harness connector.
- Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal B and ground.
- Verify that a test lamp does not illuminate between the B+ circuit terminal B and the control circuit terminal A.
- Connect a test lamp between terminal A and terminal B on the reverse lockout solenoid harness connector.
- Command the reverse lockout solenoid ON with a scan tool. The test lamp should illuminate.
- If all circuits test normal, replace the reverse lockout solenoid.
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the circuit protection fuse is open, then replace the reverse lockout solenoid. |
| ⇒ | If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM. |
| ⇒ | If the test lamp does not illuminate, test the reverse lockout solenoid control circuit for an open/high resistance. If the circuit tests normal replace the ECM. |
Repair Verification
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
