•
When Monitored:
Continuously
•
Set Condition:
This DTC is set when the Transmission Control Relay output circuit voltage at the Powertrain Control Module
is less than 3 volts when the PCM is energizing the relay. 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 cir-
cuits.
Possible Causes
(A104) FUSED B(+) CIRCUIT OPEN
(T16) TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT OPEN
(T15) TRANSMISSION CONTROL RELAY CONTROL CIRCUIT OPEN
(Z915) TRANSMISSION CONTROL RELAY GROUND CIRCUIT OPEN
(T15) TRANSMISSION CONTROL RELAY CONTROL CIRCUIT SHORT TO GROUND
(T16) TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT SHORT TO GROUND
TRANSMISSION CONTROL RELAY
TRANSMISSION SOLENOID/PRESSURE SWITCH ASSEMBLY
POWERTRAIN CONTROL MODULE
Always perform the 42RLE Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 -
TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)
Theory of Operation
The transmission control relay is used to supply power to the solenoid pack when the transmission is in normal
operating mode. When the relay is off, no power is supplied to the solenoid pack and the transmission is in Limp-in
mode. The relay output is fed back to the PCM. It is referred to as the Trans Relay Output circuit or switched
battery. After a controller reset (ignition key turned to the run position or after cranking engine), the controller ener-
gizes the relay. Prior to this, the PCM verifies that the contacts are open by checking for no voltage at the trans-
mission control relay outputs (switched battery) terminals. After the relay is energized, the PCM monitors the
terminals to verify that the voltage is greater than 3 volts. The MIL illuminates and the transmission will be placed
in Limp-in.
Diagnostic Test
1.
CHECK TO SEE IF DTC P0882 IS CURRENT
With the scan tool, view DTCs.
Is the status Active for this DTC or is the STARTS SINCE SET counter equal to 0?
Yes
>> Go To 2
No
>> Go To 10
21 - 172
AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS
KJ