Dodge Ram Truck 1500-2500-3500. Manual — part 1105

P0581-HIGH VOLTAGE DETECTED AT THE SPEED CONTROL SWITCH (CONTINUED)

9.

S/C SWITCH GROUND CIRCUIT OPEN ECM TO CLOCKSPRING

Measure the resistance of the S/C Switch Sensor Ground Circuit
between the ECM harness connector to the clockspring harness con-
nector.

Is the resistance below 5.0 ohms?

Yes

>> 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)

No

>> Repair open ground circuit from ECM to clockspring.

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

9 - 1342

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

DR/DH

P0602-CHECKSUM ERROR

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 ignition is on.

•

Set Condition:
A deviation between the ECM memory and a stored calibration.

Possible Causes

FLASH ECM

ECM

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

Diagnostic Test

1.

FLASH ECM

Using the scan tool, reflash the ECM with the proper calibration for the particular truck.

Is the flash successful?

Yes

>> Repair complete.

No

>> Go To 2

2.

ECM

With the scan tool, read DTCs.

Did P0602 set after the reflash?

Yes

>> Replace the ECM.

No

>> Test Complete.

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

9 - 1343

P0604-ECM SOFTWARE ERROR

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 key is on.

•

Set Condition:
Internal ECM software error.

Possible Causes

REFLASH ECM

ECM

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

Diagnostic Test

1.

REFLASH ECM

Using the scan tool, reflash the module with latest calibration

Was the flash successful?

Yes

>> Go To 2

No

>> Replace the ECM.

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

2.

ECM

Run the engine for one minute and shut off.

With the scan tool, read DTCs.

Did P0604 set?

Yes

>> Replace the ECM.

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

No

>> Test Complete.

9 - 1344

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

DR/DH

P0606-ECM HARDWARE ERROR

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

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
With the key on or engine running.

•

Set Condition:
ECM had detected internal failures.

Possible Causes

ECM

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

Diagnostic Test

1.

ECM

Turn the ignition on.

NOTE: This DTC is caused by an internal Engine Control Module failure. Repairs are not possible to the
ECM.
With the scan tool, erase DTCs.

Is the DTC still set?

Yes

>> 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)

No

>> Test Complete.

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

9 - 1345