Dodge Ram Truck 1500-2500-3500. Manual - part 1840

TRANSFER CASE SELECTOR SWITCH ERROR (CONTINUED)

(K977) MODE SELECT CIRCUIT OPEN

Turn the ignition off to the lock position.

Disconnect the Transfer Case Control Module C1 harness connector.

Disconnect the Transfer Case Selector Switch harness connector.

NOTE: Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the (K977) Mode Select circuit from the
Transfer Case Control Module harness connector to the Transfer Case
Selector Switch harness connector.

Is the resistance above 5.0 ohms?

Yes

>> Repair the (K977) Mode Select circuit for an open.

Perform TRANSFER CASE VERIFICATION TEST. (Refer
to 21 - TRANSMISSION/TRANSAXLE/TRANSFER CASE
- DIAGNOSIS AND TESTING)

>> Go To 3

(K977) MODE SELECT CIRCUIT SHORT TO GROUND

Measure the resistance between ground and the (K977) Mode Select
circuit.

Is the resistance below 5.0 ohms?

Yes

>> Repair the (K977) Mode Select circuit for a short to

ground.

Perform TRANSFER CASE VERIFICATION TEST. (Refer
to 21 - TRANSMISSION/TRANSAXLE/TRANSFER CASE
- DIAGNOSIS AND TESTING)

>> Go To 4

21 - 1292

TRANSFER CASE - ELECTRICAL DIAGNOSTICS (ETC)

DR/DH

TRANSFER CASE SELECTOR SWITCH ERROR (CONTINUED)

(K977) MODE SELECT CIRCUIT SHORT TO VOLTAGE

Ignition on, engine not running.

Measure the voltage of the (K977) Mode Select circuit.

Is the voltage above 0.5 volt?

Yes

>> Repair the (K977) Mode Select circuit for a short to volt-

age.

Perform TRANSFER CASE VERIFICATION TEST. (Refer
to 21 - TRANSMISSION/TRANSAXLE/TRANSFER CASE
- DIAGNOSIS AND TESTING)

>> Go To 5

(T322) 5 VOLT SELECTOR SWITCH SUPPLY CIRCUIT OPEN

Turn the ignition off to the lock position.

Disconnect the Transfer Case Control Module C2 harness connector.

Measure the resistance of the (T322) 5 Volt Selector Switch Supply
circuit from the Transfer Case Control Module C2 harness connector
to the Transfer Case Selector Switch harness connector.

Is the resistance above 5.0 ohms?

Yes

>> Repair the (T322) 5 Volt Selector Switch Supply circuit for

an open.

Perform TRANSFER CASE VERIFICATION TEST. (Refer
to 21 - TRANSMISSION/TRANSAXLE/TRANSFER CASE
- DIAGNOSIS AND TESTING)

>> Go To 6

DR/DH

TRANSFER CASE - ELECTRICAL DIAGNOSTICS (ETC)

21 - 1293

TRANSFER CASE SELECTOR SWITCH ERROR (CONTINUED)

TRANSFER CASE SELECTOR SWITCH

Connect the Transfer Case Select Switch harness connector.

Measure the resistance between the (T322) 5 Volt Selector Switch
Supply circuit in the Transfer Case Control Module C2 harness con-
nector and the (K977) Mode Select circuit in the Transfer Case Control
Module C1 harness connector.

Is the resistance between 200 ohms and 15.5k ohms in all
Selector Switch ranges?

Yes

>> Go To 7

>> Replace the Transfer Case Selector Switch in accordance

with the Service Information.

Perform TRANSFER CASE VERIFICATION TEST. (Refer
to 21 - TRANSMISSION/TRANSAXLE/TRANSFER CASE
- DIAGNOSIS AND TESTING)

TRANSFER CASE CONTROL MODULE

Using the wiring diagram as a guide, inspect the wiring and connectors relative to this DTC. Inspect all power and
ground circuits. Repair as necessary.

If there are no other possible causes remaining, view repair.

Repair

Replace the Transfer Case Control Module in accordance with the Service Information.

Perform TRANSFER CASE VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/
TRANSFER CASE - DIAGNOSIS AND TESTING)

INTERMITTENT WIRING AND CONNECTORS

The conditions necessary to set this DTC are not present at this time.

Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.

Wiggle test the wiring harness and connectors while checking for shorted and open circuits.

Using the DRBIII

, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

Were there any problems found?