P0653-SENSOR REFERENCE VOLTAGE 2 CIRCUIT HIGH
For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
The primary 5-Volt Supply circuit supplies the Camshaft Position Sensor (CMP), Camshaft Position Sensor 2, MAP Sensor, and Accelerator Pedal Position (APP) Sensor 2. For self protection, if the 5-Volt Supply circuit is shorted to ground or if one of the sensors is internally shorted, the Powertrain Control Module (PCM) will turn off the 5-Volt Supply circuit until the next ignition cycle.
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When Monitored:
Ignition on.
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Set Condition:
When the Powertrain Control Module (PCM) recognizes the Secondary 5-Volt Supply circuit voltage is too high. One Trip Fault. ETC light is flashing.
Possible Causes |
|---|
| (F856) 5-VOLT SUPPLY SHORTED TO VOLTAGE |
| (K854) 5-VOLT SUPPLY SHORTED TO VOLTAGE |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC)
| NOTE: | Improperly installed aftermarket accessories can cause this DTC to set. Check for any improperly installed aftermarket accessories before continuing with this test. |
| 1. | Turn the ignition on for at least 60 seconds. |
| 2. | With a scan tool, read the active DTCs. |
Is the DTC Active at this time?
Yes
- Go To 2
No
- Perform the INTERMITTENT CONDITION diagnostic procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
2. (F856) 5-VOLT SUPPLY SHORTED TO VOLTAGE
 |
| 1. | Turn the ignition off. |
| 2. | Disconnect all the Sensors that share the (F856) 5-Volt Supply circuit. |
| 3. | Disconnect the APP Sensor harness connector. |
| 4. | Ignition on, engine not running. |
| 5. | Measure the voltage on the (F856) 5-Volt Supply circuit at the CMP Sensor harness connector. |
Is the voltage reading above 5.2 Volts?
Yes
- Repair the short to voltage in the (F856) 5-Volt Supply circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
-
Go To 3
3. (K854) 5-VOLT SUPPLY SHORTED TO VOLTAGE
 |
| 1. | Measure the voltage at the (K854) 5-Volt Supply circuit at the APP Sensor harness connector. |
Is the voltage reading above 5.2 Volts?
Yes
- Repair the short to voltage in the (K854) 5-Volt Supply circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
-
Go To 4
4. POWERTRAIN CONTROL MODULE (PCM)
| 1. | Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensors and the Powertrain Control Module (PCM). |
| 2. | Look for any chafed, pierced, pinched, or partially broken wires. |
| 3. | Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related Sensor and Powertrain Control Module connectors. |
| 4. | Perform any Technical Service Bulletins that may apply. |
Were there any problems found?
Yes
- Repair as necessary.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
- Replace and program the Powertrain Control Module in accordance with the service information.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).