Chrysler Crossfire. Manual — part 754
(P0778) SOLENOID SUPPLY VOLTAGE
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NAG1 - ELECTRICAL DIAGNOSTICS
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(P0778) SOLENOID SUPPLY VOLTAGE (CONTINUED)
When Monitored and Set Condition
•
When Monitored: When the solenoid is active or not active and no undervoltage condition exists.
•
Set Condition: If voltage is present when the output is off or the measured supply voltage and measured bat-
tery voltage differ by 3.6 volts.
POSSIBLE CAUSES
SOLENOID SUPPLY CIRCUIT SHORT TO ANOTHER CIRCUIT
SOLENOID SUPPLY VOLTAGE CIRCUIT SHORT TO GROUND
SOLENOID
TRANSMISSION CONTROL MODULE
For a complete Transmission Control Module Circuit Diagram, (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTO-
MATIC - NAG1 - SCHEMATICS AND DIAGRAMS).
Diagnostic Test
1.
PRE-DIAGNOSTIC CHECK OUT
Note: Low fluid level can be the cause of many transmission
problems. If the fluid level is low, locate and repair the leak then
check and adjust the fluid level in accordance with the Service
Information.
Note: Always perform diagnostics with a fully charged battery to
avoid false symptoms.
With the DRB III
T
, read Engine DTCs. Check and repair all engine
DTCs prior to performing transmission symptom diagnostics.
With the DRB III
T
, read and record all Transmission DTCs.
Note: Check connectors - Clean/repair as necessary. Poor pin to
terminal connections can set DTCs.
Using the wiring diagram/schematic as a guide, inspect the wiring and
connectors. Repair as necessary.
Most DTCs set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run.
Note: Check for any Technical Service Bulletins that may apply.
Perform this procedure prior to Symptom diagnosis.
Continue
Go To 2
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(P0778) SOLENOID SUPPLY VOLTAGE (CONTINUED)
2.
CHECK FOR CURRENT DTC
Note: If the TCM detects and stores a DTC, the TCM also stores
the engine/vehicle operating conditions under which the DTC was
set. Some of these conditions are displayed on the DRB III
T
at the
same time the DTC is displayed.
Note: Before erasing stored DTCs, record these conditions.
Attempting to duplicate these conditions may assist when check-
ing for an active DTC.
Turn the ignition on.
With the DRB III
T
, erase Transmission DTCs.
Note: It maybe necessary to road test the vehicle for this DTC to
set.
With the DRB III
T
, read Transmission DTCs.
Did this DTC set again?
Yes
>> Go To 3
No
>> Go To 6
3.
SOLENOID SUPPLY CIRCUIT SHORT TO ANOTHER CIRCUIT
Turn the ignition off.
Disconnect the Transmission Control Module C2 harness connector.
Disconnect the Transmission Solenoid Assembly harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between the Solenoid Supply Voltage circuit
and all other circuits in the Transmission Solenoid Assembly harness
connector.
Is the resistance above 100 kohms for all measurements?
Yes
>> Go To 4
No
>> Repair the Solenoid Supply Voltage circuit for a short to
another circuit.
Perform NAG1 TRANSMISSION VERIFICATION TEST.
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(P0778) SOLENOID SUPPLY VOLTAGE (CONTINUED)
4.
SOLENOID SUPPLY CIRCUIT SHORT TO GROUND
With the ignition off.
Measure the resistance between ground and the Solenoid Supply Volt-
age circuit at the Transmission Solenoid Assembly harness connector.
Is the resistance above 100 kohms?
Yes
>> Go To 5
No
>> Repair the Solenoid Supply Voltage circuit for a short to
ground.
Perform NAG1 TRANSMISSION VERIFICATION TEST.
5.
SOLENOID ASSEMBLY SHORT TO GROUND
With the ignition off.
Reconnect the Transmission Solenoid Assembly harness connector.
Measure the resistance between ground and all Solenoid Control cir-
cuits at the Transmission Control Module C2 harness connector.
Is the resistance above 100 kohms?
Yes
>> Replace the Transmission Control Module. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
TRANSMISSION CONTROL MODULE - REMOVAL).
Perform NAG1 TRANSMISSION VERIFICATION TEST.
No
>> Replace the Solenoid that is shorted to ground. (Refer to
21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1/
ELECTROHYDRAULIC UNIT - REMOVAL).
Perform NAG1 TRANSMISSION VERIFICATION TEST.
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