Dodge Ram Truck 1500-2500-3500. Manual — part 1115

P0698-ACCELERATOR PEDAL POSITION SENSOR (APPS) SUPPLY VOLTAGE TOO
LOW

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ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

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P0698-ACCELERATOR PEDAL POSITION SENSOR (APPS) SUPPLY VOLTAGE TOO LOW (CONTINUED)

For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS)

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
With engine running.

•

Set Condition:
Low voltage detected at the APPS supply circuit or low voltage detected at the APPS 1 5–volt supply.

Possible Causes

(F855) APPS 5-VOLT SUPPLY OPEN

APPS HIGH RESISTANCE

(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO (K922) RETURN CIRCUIT

(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO BATTERY NEGATIVE

ECM

INTERMITTENT CONDITION

(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO OTHER CIRCUITS

APPS

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)

1.

(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO BATTERY NEGATIVE

Turn the ignition off.

Disconnect the ECM harness connectors.

Disconnect the APPS harness connector.

Check connectors - Clean/repair as necessary.

Measure the resistance of the APPS 1 (F855) 5-volt supply circuit
between the sensor harness connector and battery negative

Is the resistance greater than 100 k ohms?

Yes

>> Go To 2

No

>> Repair the (F855) 5-volt supply circuit shorted to battery

negative.

Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

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P0698-ACCELERATOR PEDAL POSITION SENSOR (APPS) SUPPLY VOLTAGE TOO LOW (CONTINUED)

2.

(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO OTHER CIRCUITS

Measure the resistance between the (F855) APPS 1 5-volt supply cir-
cuit at the ECM harness connector and all other circuits in the ECM
connector.

Is the resistance greater than 100k ohms?

Yes

>> Go To 3

No

>> Repair the APPS #1 (F855) 5-volt supply circuit shorted to

other circuits.

Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)

3.

INTERNAL ECM

Reconnect the ECM harness connectors.

Turn ignition on, engine off.

While monitoring with the scan tool, connect a jumper wire between
the (K23) APPS 1 signal circuit at the sensor harness connector and
the (F855) APPS 1 supply circuit at the sensor harness connector.

NOTE: With the APPS disconnected it is normal to have a APPS 1
and APPS 2 low voltage DTC set.

Did a APPS 1 voltage too high DTC set?

Yes

>> Go To 4

No

>> Replace and program the ECM in accordance with the

Service Information.

Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)

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ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

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P0698-ACCELERATOR PEDAL POSITION SENSOR (APPS) SUPPLY VOLTAGE TOO LOW (CONTINUED)

4.

APPS

Reconnect the APPS harness connector.

Ignition on, engine not running.

Monitor the APPS 1 and APPS 2 voltage with the scan tool while depressing the throttle pedal.

Is the voltage transition shown on the scan tool smooth while depressing the throttle and is the volt
swing smooth?

Yes

>> Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure). (Refer to 9 - ENGINE -

DIAGNOSIS AND TESTING)

No

>> Replace the APPS.

Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

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