P0698-SENSOR REFERENCE VOLTAGE 3 CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W
Possible Causes
|
INTERMITTENT DTC
|
CRANKSHAFT POSITION SENSOR
|
ACCELERATOR PEDAL POSITION SENSOR
|
5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
|
ENGINE CONTROL MODULE
|
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
Theory of Operation
The ECM contains 3 internal 5–Volt Sensor Supply sources. Each 5–Volt Supply source is split into parallel circuits to provide 5 volts to multiple sensors. Sensor Supply 2 provides
5 volts to the Crankshaft Position Sensor and the Accelerator Pedal Position Sensor 1.
Diagnostic Test
1.
CHECK FOR ACTIVE DTC
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Turn the ignition off for 10 seconds.
Turn the ignition on.
With the scan tool, View DTCs.
Is the status Active for this DTC?
Yes
No
2.
CRANKSHAFT POSITION SENSOR SHORTED TO GROUND
Turn the ignition off.
Disconnect the Crankshaft Position Sensor harness connector.
Turn the ignition on.
Measure the voltage of the (K853) Crankshaft Position Sensor 5 Volt Supply circuit at the Crankshaft Position Sensor harness connector.
Is the voltage above 4.6 volts?
Yes
No
3.
ACCELERATOR PEDAL POSITION SENSOR 1 SHORTED TO GROUND
Turn the ignition off.
Disconnect the Accelerator Pedal Position Sensor harness connector.
Turn the ignition on.
Measure the voltage of the (K855) Accelerator Pedal Position Sensor 1 5 Volt Supply circuit at the Accelerator Pedal Position Sensor harness connector.
Is the voltage above 4.6 volts?
Yes
No
4.
5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the (K853) Crankshaft Position Sensor 5 Volt Supply circuit
at the Crankshaft Position Sensor harness connector.
Measure the resistance between ground and the (F855) Accelerator Pedal Position Sensor 1 5 Volt Supply circuit at the Accelerator Pedal Position Sensor harness connector.
Is the resistance above 1000 ohms for each circuit?
Yes
No
5.
ENGINE CONTROL MODULE (ECM)
Turn the ignition off.
Inspect the (K853) Crankshaft Position Sensor 5 Volt Supply circuit between the Crankshaft Position Sensor harness connector and the ECM harness connector.
Inspect the (F855) Accelerator Pedal Position Sensor 1 5 Volt Supply circuit between the Accelerator Pedal Position Sensor harness connector and the ECM harness connector.
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Refer to any Technical Service Bulletins that may apply.
Were any problems found?
Yes
No