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 Descriptors
DTC P0698: 5-Volt Reference 3 Circuit Low VoltageDTC P0699: 5-Volt Reference 3 Circuit High Voltage
Diagnostic Fault Information
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
APP Sensor 1 - 5-Volt Reference | P0107, P0698, P2122, P2564 | P2138 | P2122 | P0106, P0699, P2123, P2227, P02565 | -- |
MAP Sensor - 5-Volt Reference | P0107, P0698, P2564 | P0101 | P0107 | P0106, P0401, P0699, P003A, P2565 | -- |
TC Vane Position Sensor - 5-Volt Reference | P0107, P0698, P2564 | P2563 | P2564 | P0106, P0401, P0699, P2565 | -- |
EGR Valve - 5-Volt Reference | P0107, P0698, P2564 | P046C | P0405 | P0106, P0401, P0699, P2565 | -- |
Circuit/System Description
These 5-volt reference circuits are independent of each other outside the engine control module (ECM), but are bussed together inside the ECM. Therefore, a circuit condition on one sensor 5-volt reference circuit may affect the other sensor 5-volt reference circuits. The ECM monitors the voltage on the 5-volt reference circuit.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | Diagnostics run continuously. |
Conditions for Setting the DTC
P0698
| • | The ECM detects the 5-volt reference 3 circuit voltage is less than 4.7 volts. |
| • | The above condition is present for 2 seconds. |
P0699
| • | The ECM detects the 5-volt reference 3 circuit voltage is more than 5.2 volts. |
| • | The above condition is present for 2 seconds. |
Action Taken When the DTC Sets
DTCs P0698 and P0699 are Type A DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0698 and P0699 are Type A DTCs.
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Engine starts and runs.
Circuit/System Testing
Important: Additional DTCs will set when disconnecting the components.
- Ignition OFF, disconnect the harness connector of all appropriate sensors for the applicable DTC.
- Ignition ON, measure for 4.8-5.2 volts between one of the 5-volt reference circuits and ground.
- Connect each component associated with the 5-volt reference circuit, one at a time, while monitoring the voltage. The voltage should not change more than 1 volt.
Important: A short to voltage on the signal circuit of certain components may cause this DTC to set.
| ⇒ | If the voltage is less than the specified range, test for a short to ground on all the 5-volt reference circuits. If all circuits test normal, replace the ECM. |
| ⇒ | If the voltage is greater than the specified range, test for a short to voltage on all the 5-volt reference circuits. If all circuits test normal, replace the ECM. |
| ⇒ | If the voltage display increases greater than the specified value when a component is connected, test the signal circuit for a short to voltage. If all circuits test normal, replace the ECM. |
| ⇒ | If the voltage display decreases more than the specified value when a component is connected, replace the component. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
