Dodge Ram Truck 1500-2500-3500. Manual — part 1816

TRANSFER CASE - ELECTRICAL DIAGNOSTICS (ETC)

TABLE OF CONTENTS

page

page

TRANSFER CASE - ELECTRICAL

DIAGNOSTICS (ETC)
DIAGNOSIS AND TESTING

TRANSFER CASE VERIFICATION TEST

VER 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1197

12 VOLT OVER VOLTAGE

. . . . . . . . . . . . . 1198

12 VOLT UNDER VOLTAGE

. . . . . . . . . . . . 1200

2WD/AWD INDICATOR OPEN

. . . . . . . . . . 1204

2WD/AWD INDICATOR SHORTED

. . . . . . . 1208

4WD HI INDICATOR OPEN

. . . . . . . . . . . . 1212

4WD HI INDICATOR SHORT TO GROUND

. 1216

4WD LO INDICATOR OPEN

. . . . . . . . . . . . 1220

4WD LO INDICATOR SHORT TO

GROUND . . . . . . . . . . . . . . . . . . . . . . . . . . 1224

5 VOLT OVER VOLTAGE

. . . . . . . . . . . . . . 1228

5 VOLT UNDER VOLTAGE

. . . . . . . . . . . . . 1234

INTERNAL ERROR

. . . . . . . . . . . . . . . . . . 1240

MISSING BRAKE INPUT

. . . . . . . . . . . . . . 1241

MISSING ENGINE RPM INPUT

. . . . . . . . . 1244

MISSING IGNITION MESSAGE

. . . . . . . . . 1247

MISSING LAMP DIMMING MESSAGE

. . . . 1250

MISSING SPEED DIFFERENCE

MESSAGE . . . . . . . . . . . . . . . . . . . . . . . . . 1253

MISSING TRANSFER CASE TYPE

. . . . . . . 1256

MISSING TRANSMISSION POSITION

INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1259

MISSING TRANSMISSION TYPE

. . . . . . . . 1262

MISSING VEHICLE SPEED INPUT

. . . . . . . 1265

NEUTRAL INDICATOR OPEN

. . . . . . . . . . . 1268

NEUTRAL INDICATOR SHORT TO

GROUND . . . . . . . . . . . . . . . . . . . . . . . . . . 1273

SELECTOR SWITCH/TRANSFER CASE—

MISMATCH . . . . . . . . . . . . . . . . . . . . . . . . . 1278

TRANSFER CASE MODE SENSOR

ERROR . . . . . . . . . . . . . . . . . . . . . . . . . . . 1284

TRANSFER CASE SELECTOR SWITCH

ERROR . . . . . . . . . . . . . . . . . . . . . . . . . . . 1290

TRANSFER CASE - ELECTRICAL DIAGNOSTICS (ETC)

DIAGNOSIS AND TESTING

21 - 1196

TRANSFER CASE - ELECTRICAL DIAGNOSTICS (ETC)

DR/DH

TRANSFER CASE VERIFICATION TEST VER 1

Diagnostic Test

1.

TRANSFER CASE VERIFICATION TEST— VER 1

Disconnect all jumper wires and reconnect all previously disconnected components and connectors.

With the scan tool, clear all DTCs.

Make sure that all accessories are turned off and that the battery is fully charged.

Using the appropriate Service Information as a guide, test drive the vehicle in each Transfer Case range and verify
proper operation in each range.

With the scan tool, read DTCs in the Transfer Case Control Module.

Are there any DTCs present?

Yes

>> Return to the symptom list and perform the appropriate diagnostic test.

No

>> Repair is complete.

DR/DH

TRANSFER CASE - ELECTRICAL DIAGNOSTICS (ETC)

21 - 1197

12 VOLT OVER VOLTAGE

21 - 1198

TRANSFER CASE - ELECTRICAL DIAGNOSTICS (ETC)

DR/DH

12 VOLT OVER VOLTAGE (CONTINUED)

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
Continuously with the ignition on.

•

Set Condition:
The Transfer Case Control Module detects the Fused B+ voltage rises above 16.0 volts for 2 seconds.

Possible Causes

CHARGING SYSTEM DTCS PRESENT

TRANSFER CASE CONTROL MODULE

1.

CHARGING SYSTEM DTCS PRESENT

With the DRBIII

T

, read Engine DTCs.

Are there any Charging System related DTCs present?

Yes

>> Refer to the symptom list and perform the appropriate diagnostic procedure(s) as necessary.

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

No

>> Go To 2

2.

TRANSFER CASE CONTROL MODULE

Using the schematics as a guide, inspect the wiring and connectors. Pay particular attention to all power and ground
circuits. Repair as necessary.

If there are no Charging System related DTCs or other possible causes remaining, view repair.

Repair

Replace the Transfer Case Control Module.

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

DR/DH

TRANSFER CASE - ELECTRICAL DIAGNOSTICS (ETC)

21 - 1199