Dodge Ram Truck 1500-2500-3500. Manual — part 1106

P0607-ECM INTERNAL FAILURE

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.

Is the DTC P0606 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.

9 - 1346

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

DR/DH

P0622-GENERATOR FIELD NOT SWITCHING PROPERLY

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

9 - 1347

P0622-GENERATOR FIELD NOT SWITCHING PROPERLY (CONTINUED)

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

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
When the ignition is on.

•

Set Condition:
The feedback signal does not match the commanded signal for the voltage regulator.

Possible Causes

GENERATOR

OPEN DRIVER CIRCUIT

GEN SOURCE SHORTED TO BATTERY NEGATIVE

(K20) FIELD DRIVER CIRCUIT SHORTED TO VOLTAGE

GEN SOURCE OPEN

ECM

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

Diagnostic Test

1.

GENERATOR

Turn the ignition off.

Disconnect the Generator field harness connector.

Check connectors - Clean/repair as necessary.

Measure the resistance between the generator field terminals.

Is the resistance between .5 and 15 Ohms?

Yes

>> Go To 2

No

>> Replace the Generator.

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

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ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

DR/DH

P0622-GENERATOR FIELD NOT SWITCHING PROPERLY (CONTINUED)

2.

OPEN DRIVER CIRCUIT

Disconnect the ECM harness connectors.

Check connectors - Clean/repair as necessary.

Measure the resistance of the generator driver wire between the gen-
erator harness connector and the ECM harness connector.

Is the resistance less than 10 ohms.

Yes

>> Go To 3

No

>> Repair the open driver circuit.

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

3.

GENERATOR FIELD CIRCUIT OPEN

Measure the resistance of the generator field return circuit between
the generator harness connector and battery negative.

Is the resistance less than 10 ohms.

No

>> Repair the Generator field return shorted to Battery nega-

tive.

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

Yes

>> Go To 4

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

9 - 1349