Dodge Ram Truck 1500-2500-3500. Manual — part 1824

5 VOLT OVER VOLTAGE

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TRANSFER CASE - ELECTRICAL DIAGNOSTICS (ETC)

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5 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 that the 5 Volt Supply circuit voltage goes above 6.0 volts for 2
seconds.

Possible Causes

INTERMITTENT 5 VOLT OVER VOLTAGE

CHARGING SYSTEM DTCS PRESENT

5 VOLT SUPPLY CIRCUIT(S) SHORTED TO VOLTAGE

(T322) 5 VOLT SELECTOR SWITCH SUPPLY CIRCUIT SHORTED TO (T315) SHIFT MOTOR CONTROL A
CIRCUIT

(T322) 5 VOLT SELECTOR SWITCH SUPPLY CIRCUIT SHORTED TO (T316) SHIFT MOTOR CONTROL B
CIRCUIT

(T313) 5 VOLT MODE SENSOR SUPPLY CIRCUIT SHORTED TO (T315) SHIFT MOTOR CONTROL A CIRCUIT

(T313) 5 VOLT MODE SENSOR SUPPLY CIRCUIT SHORTED TO (T316) SHIFT MOTOR CONTROL B CIRCUIT

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.

No

>> Go To 2

2.

5 VOLT OVER VOLTAGE DTC PRESENT

With the DRBIII

T

, read Transfer Case DTCs. Record all DTC information.

With the DRBIII

T

, erase Transfer Case DTCs.

Start the engine and cycle the Transfer Case Selector Switch through all positions.

With the DRBIII

T

, read Transfer Case DTCs.

Does the DRBIII

T

display 5 VOLT OVER VOLTAGE?

Yes

>> Go To 3

No

>> Go To 9

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TRANSFER CASE - ELECTRICAL DIAGNOSTICS (ETC)

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5 VOLT OVER VOLTAGE (CONTINUED)

3.

5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

Turn the ignition off to the lock position.

Disconnect the Shift Motor/Mode Sensor C2 harness connector.

Disconnect the Transfer Case Selector Switch harness connector.

Disconnect the Transfer Case Control Module C2 harness connector.

NOTE: Check connectors - Clean/repair as necessary.
Turn the ignition on.

Measure the voltage of the (T322) 5 Volt Selector Switch Supply circuit
in the Transfer Case Selector Switch harness connector.

Measure the voltage of the (T313) 5 Volt Mode Sensor Supply circuit
in the Shift Motor/Mode Sensor C2 harness connector.

Is there any voltage present in the 5 Volt Supply circuit at either
connector?

Yes

>> Repair the 5 Volt Supply circuit(s) for a short to voltage.

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

No

>> Go To 4

4.

(T322) 5 VOLT SELECTOR SWITCH SUPPLY CIRCUIT SHORTED TO (T315) SHIFT MOTOR CONTROL A
CIRCUIT

Turn the ignition off to the lock position.

Disconnect the Shift Motor/Mode Sensor C1 harness connector.

NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance between the (T322) 5 Volt Selector Switch
Supply circuit in the Transfer Case Selector Switch harness connector
and the (T315) Shift Motor Control A circuit in the Shift Motor/Mode
Sensor C1 harness connector.

Is the resistance below 5.0 ohms between the 5 Volt Supply cir-
cuit and the Shift Motor Control circuit?

Yes

>> Repair the 5 Volt Supply circuit for short to the Shift Motor

Control circuit.

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

No

>> Go To 5

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TRANSFER CASE - ELECTRICAL DIAGNOSTICS (ETC)

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5 VOLT OVER VOLTAGE (CONTINUED)

5.

(T322) 5 VOLT SELECTOR SWITCH SUPPLY CIRCUIT SHORTED TO (T316) SHIFT MOTOR CONTROL B
CIRCUIT

Measure the resistance between the (T322) 5 Volt Selector Switch
Supply circuit in the Transfer Case Selector Switch harness connector
and the (T316) Shift Motor Control B circuit in the Shift Motor/Mode
Sensor C1 harness connector.

Is the resistance below 5.0 ohms between the 5 Volt Supply cir-
cuit and the Shift Motor Control circuit?

Yes

>> Repair the 5 Volt Supply circuit for short to the Shift Motor

Control circuit.

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

No

>> Go To 6

DR/DH

TRANSFER CASE - ELECTRICAL DIAGNOSTICS (ETC)

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