Dodge Ram Truck 1500-2500-3500. Manual — part 1731

P0869-GOVERNOR PRESSURE SENSOR VOLTS TOO LOW (DIESEL) (CONTINUED)

5.

CHECK THE TRANSMISSION SOLENOID ASSEMBLY

Reconnect the Transmission Solenoid Assembly harness connector.

Remove the Transmission Oil Pan per the Service Information. (Refer
to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 48RE/FLUID -
STANDARD PROCEDURE)

Disconnect the Governor Pressure/Transmission Temperature Sensor
connector (inside transmission).

Measure the resistance between the (T38) Governor Pressure Sensor
Signal circuit and all other circuits in the ECM C1 and C2 harness
connectors.

Is the resistance below 100k ohms between the (T38) Governor
Pressure Sensor Signal circuit any other circuits in the ECM C2
harness connector?

Yes

>> Replace the Transmission Solenoid Assembly per the Ser-

vice Information.

Perform RE TRANSMISSION VERIFICATION TEST VER -
1 (DIESEL). (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - 48RE - STANDARD PROCEDURE)

No

>> Go To 6

6.

CHECK THE GOVERNOR PRESSURE SENSOR SENSOR

Turn the ignition on.

With the scan tool, erase DTCs.

Connect a jumper wire between the (T38) Governor Pressure Sensor
Signal circuit and the (F856) 5-volt Supply circuit in the Governor
Pressure Sensor connector.

With the scan tool, read DTCs.

Did the DTC P0868 set?

Yes

>> Inspect the Governor Pressure Sensor wiring for damage.

If no problems are found, replace the Governor Pressure
Sensor per the Service Information.

Perform RE TRANSMISSION VERIFICATION TEST VER -
1 (DIESEL). (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - 48RE - STANDARD PROCEDURE)

No

>> Using the schematics as a guide, check the Engine Control Module (ECM) pins, terminals, and connec-

tors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground cir-
cuits. If no problems are found, replace and program the ECM per the Service Information. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES/ENGINE CONTROL MODULE - REMOVAL)

Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 48RE - STANDARD PROCEDURE)

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AUTOMATIC TRANSMISSION - 48RE - DIESEL - ELECTRICAL DIAGNOSTICS

DR/DH

P0869-GOVERNOR PRESSURE SENSOR VOLTS TOO LOW (DIESEL) (CONTINUED)

7.

INTERMITTENT WIRING AND CONNECTORS

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

Use the Freeze Frame Data to help duplicate the conditions in which the DTC originally set. Pay particular attention
to the DTC set conditions, such as, VSS, MAP, ECT, and Load

Using the schematics as a guide, visually inspect the related wiring harness. Look for any chafed, pierced, pinched,
or partially broken wires.

Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.

Wiggle the wiring and connectors while checking for any possible open or shorted circuits.

Check for any Service Information Tune-ups or Technical Service Bulletins that may apply.

Were there any problems found?

Yes

>> Repair as necessary.

Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 48RE - STANDARD PROCEDURE)

No

>> Test Complete.

DR/DH

AUTOMATIC TRANSMISSION - 48RE - DIESEL - ELECTRICAL DIAGNOSTICS

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P0882-TRANS 12 VOLT SUPPLY RELAY CONTROL CIRCUIT LOW (DIESEL)

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AUTOMATIC TRANSMISSION - 48RE - DIESEL - ELECTRICAL DIAGNOSTICS

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P0882-TRANS 12 VOLT SUPPLY RELAY CONTROL CIRCUIT LOW (DIESEL) (CONTINUED)

For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 48RE - SCHE-
MATICS AND DIAGRAMS)

For a complete wiring diagramRefer to Section 8W

Theory of Operation

The Transmission Control Relay supplies power to the TCC, Overdrive, and Governor Pressure Solenoids when in
normal operating mode. The Transmission Control Relay Control circuit is constantly monitored by the ECM. If the
expected state of the Transmission Control Relay Control circuit is different then the expected state, a correspond-
ing DTC will set and the ECM will de-energize the Transmission Control Relay and place the transmission in Limp-
in.

•

When Monitored:
Continuously with the Ignition on.

•

Set Condition:
This DTC will set if the ECM monitored voltage of the Transmission Control Relay Control circuit is different
than the expected voltage for the period 3.0 seconds.

Possible Causes

FUSED B(+) CIRCUIT OPEN

(T515) TRANSMISSION CONTROL RELAY CONTROL CIRCUIT OPEN

FUSED B(+) CIRCUIT SHORT TO GROUND

(T515) TRANSMISSION CONTROL RELAY CONTROL CIRCUIT SHORT TO GROUND

(T515) TRANSMISSION CONTROL RELAY CONTROL CIRCUIT SHORT TO ANOTHER CIRCUIT

TRANSMISSION CONTROL RELAY

ENGINE CONTROL MODULE

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - 48RE - STANDARD PROCEDURE)

1.

CHECK IF THE DTC IS CURRENT

Ignition on, engine not running.

With the scan tool, read Engine DTCs.

Record the Freeze Frame data for the reported DTC.

With the scan tool, erase DTCs.

Turn the ignition off to the lock position.

Using the Freeze Frame data recorded earlier, try to duplicate the conditions in which the DTC originally set.

NOTE: It may be necessary to road test the vehicle to duplicate the original set conditions.
With the scan tool, read Engine DTCs.

Did the DTC reset?

Yes

>> Go To 2

No

>> Go To 10

DR/DH

AUTOMATIC TRANSMISSION - 48RE - DIESEL - ELECTRICAL DIAGNOSTICS

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