Dodge Ram Truck 1500-2500-3500. Manual — part 1125

P2128-PPS 2 VOLTAGE TOO HIGH (CONTINUED)

2.

(K29) APPS NO. 2 SIGNAL CIRCUIT SHORTED TO (F856)APPS NO. 1 5-VOLT SUPPLY

Measure the resistance between the (K29) APPS No. 2 signal circuit in
the sensor harness connector and the (F856)APPS No. 2 5-volt supply
circuit in the sensor harness connector.

Is the resistance greater than 100 K ohms?

Yes

>> Go To 3

No

>> Repair the (K29) APPS No. 2 signal circuit shorted to the

(F856)5-volt supply circuit.

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

3.

(K29) APPS SIGNAL CIRCUIT SHORTED TO ANOTHER CIRCUIT

Measure the resistance between the APPS No. 2 signal circuit at the
ECM harness connector and all other circuits in the ECM harness con-
nector.

Is the resistance greater than 100 k ohms?

Yes

>> Go To 4

No

>> Repair the (K29) APPS No. 2 signal circuit shorted to

another circuit in the engine harness.

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

DR/DH

P2128-PPS 2 VOLTAGE TOO HIGH (CONTINUED)

4.

ECM

Reconnect the ECM harness connectors.

Reconnect the APPS harness connector.

While monitoring with the scan tool, disconnect the sensor connector.

Did a APPS No. 1 and APPS No. 2 voltage too low DTC set?

Yes

>> Go To 5

No

>> Replace and program the ECM in accordance with the Service Information.

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

5.

APPS

Reconnect the APPS harness connector.

Monitor the APPS No. 1 and APPS No. 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 voltage
from APPS 1 twice as much as from APPS2

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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P2146-BANK 1 (CYLINDERS 1-3) SHORTED HIGH OR LOW

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ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

DR/DH

P2146-BANK 1 (CYLINDERS 1-3) SHORTED HIGH OR 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:
While the engine is running.

•

Set Condition:
A circuit failure detected at cylinders 1,2, or 3 or any combination of cylinders 1,2, or 3.

Possible Causes

OTHER DTC’S

HIGH SIDE DRIVER CIRCUIT OPEN

LOW SIDE DRIVER CIRCUIT OPEN

HIGH SIDE DRIVER SHORTED TO LOW SIDE DRIVER

HIGH SIDE DRIVERS SHORTED LOW

LOW SIDE DRIVER CIRCUIT SHORTED OTHER LOW SIDE DRIVER CIRCUIT

LOW SIDE DRIVERS SHORTED LOW

HIGH SIDE DRIVER SHORTED TO VOLTAGE

LOW SIDE DRIVER SHORTED TO VOLTAGE

LOW SIDE DRIVER CIRCUIT SHORTED IN INJECTOR HARNESS

INJECTOR

INJECTOR HARNESS

INTERMITTENT CONDITION

ECM

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

Diagnostic Test

1.

OTHER DTC’S

With the scan tool, read DTCs.

Do you have any combination of DTC’s P0201, P0202, or P0203?

Yes

>> Repair other DTC’s first.

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

No

>> Go To 2

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

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