Dodge Dakota (ND). Manual - part 949

P0871-OD PRESSURE SWITCH RATIONALITY (CONTINUED)

(T9) OD PRESSURE SWITCH SENSE CIRCUIT OPEN

Turn the ignition off to the lock position.

Disconnect the PCM C4 harness connector.

Disconnect the Transmission Solenoid/Pressure Switch Assembly har-
ness connector.

NOTE: Check connectors - Clean/repair as necessary.

CAUTION: Do not probe the PCM harness connectors. Probing
the PCM harness connectors will damage the PCM terminals
resulting in poor terminal to pin connection. Install Miller Special
Tool #8815 to perform diagnosis.
Measure the resistance of the (T9) OD Pressure Switch Sense circuit
from the appropriate terminal of special tool #8815 to the Transmission
Solenoid/Pressure Switch Assembly harness connector.

Is the resistance above 5.0 ohms?

Yes

>> Repair the (T9) OD Pressure Switch Sense circuit for an

open.

Perform 42RLE TRANSMISSION VERIFICATION TEST -
VER 1.

>> Go To 6

(T9) OD PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND

Measure the resistance between ground and the (T9) OD Pressure
Switch Sense circuit.

Is the resistance below 5.0 ohms?

Yes

>> Repair the (T9) OD Pressure Switch Sense circuit for a

short to ground.

Perform 42RLE TRANSMISSION VERIFICATION TEST -
VER 1.

>> Go To 7

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AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS

P0871-OD PRESSURE SWITCH RATIONALITY (CONTINUED)

(T9) OD PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE

Remove the Transmission Control Relay.

NOTE: Check connectors - Clean/repair as necessary.
Connect a jumper wire between the (A104) Fused B+ circuit and (T16)
Transmission Control Relay Output circuit.

Ignition on, engine not running.

Measure the voltage of the (T9) OD Pressure Switch Sense circuit.

Is the voltage above 0.5 volts?

Yes

>> Repair the (T9) OD Pressure Switch Sense circuit for a

short to voltage.

Perform 42RLE TRANSMISSION VERIFICATION TEST -
VER 1.

>> Go To 9

OD PRESSURE SWITCH

If there are no possible causes remaining, view repair.

Repair

Replace the Transmission Solenoid/Pressure Switch Assembly per the Service Information.

Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1.

POWERTRAIN CONTROL MODULE

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

If there are no possible causes remaining, view repair.

Repair

Replace the Powertrain Control Module per the Service Information. With the scan tool perform QUICK
LEARN.

Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1.

AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS

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P0871-OD PRESSURE SWITCH RATIONALITY (CONTINUED)

10.

INTERMITTENT WIRING AND CONNECTORS

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

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

Wiggle the wires while checking for shorted and open circuits.

With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set.

Were there any problems found?

Yes

>> Repair as necessary.

Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1.

>> Test Complete.

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AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS

P0884-POWER UP AT SPEED

For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - SCHE-
MATICS AND DIAGRAMS)

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
One time after each controller reset. Note: the Transmission Control Module is integrated with Powertrain Con-
trol Module. The Transmission Control Module has separate powers and grounds specifically to its portion of
the PCM.

•

Set Condition:
This DTC will set if the PCM powers up and senses the vehicle in a valid forward gear (no PRNDL DTCs) with
a output speed above 800 RPM, approximately 32Km/h or 20 MPH.

Possible Causes

INTERMITTENT POWER AND GROUND CIRCUITS

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - 42RLE - DIAGNOSIS AND TESTING).

Theory of Operation

If a vehicle loses power to the PCM, the vehicle will go to the 2nd gear mode since there is no power available to
control the transmission solenoids. However if power is restored, the PCM will power-up and normal operation will
be restored. This DTC identifies that power to the PCM was restored when the gear selector was in a

Drive

posi-

tion while the vehicle was moving at speeds above 32 Km/h (20 MPH). If a customer shifts to Neutral and cycles
the ignition key and quickly shifts to

Drive

while moving before the PCM comes out of its START ROUTINE, the

DTC can be set. Therefore it is critical that this DTC diagnosis repair procedure should only be used if the vehicle
is experiencing intermittent 2nd gear operation and subsequently a return to normal operation during normal driving.
The transmission will not be placed in Limp-in. This is an informational DTC to be used when attempting to diag-
nose an intermittent 2nd gear operation and subsequent return to normal transmission operation.

Diagnostic Test

CHECK THE POWER AND GROUND CIRCUITS

This DTC is set when the PCM is initialized while the vehicle is moving in a valid forward gear. This is usually
caused by a momentary loss of power to the Transmission portion of the PCM.

NOTE: Due to the integration of the Powertrain and Transmission Control Modules, the transmission part of
the PCM has its own specific power and ground circuits.
Check all of the Fused B+, Fused Ignition Switch Output, and Ground circuits related to the PCM for an intermittent
open or short to ground.

Perform a wiggle test on all wiring and connectors pertaining to the PCM while looking for shorted or open circuits.

With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set.

If there are no possible causes remaining, view repair.

Repair

Repair as necessary.

Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1.

AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS

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