Chrysler Crossfire. Manual — part 739
(P0715) N2 INPUT SPEED SENSOR CIRCUIT (CONTINUED)
10.
CHECKING N2 INPUT SPEED SENSOR W/ LAB SCOPE
With the ignition off.
Reconnect the TCM C2 harness connector.
Reconnect the Transmission Solenoid Assembly harness connector.
With the DRB III
T
/PEP Module being used as a Dual Channel Lab
Scope with Special Tool #6801, backprobe N2 Input Speed Sensor
Signal circuit using Channel 1 at the TCM C2 harness connector.
WARNING: PROPERLY SUPPORT VEHICLE.
Raise all drive wheels off the ground.
Start the engine.
WARNING: BE SURE TO KEEP HANDS AND FEET CLEAR OF
ROTATING WHEELS.
Place gear selector in drive and increase vehicle speed to engage 2nd
gear.
Compare the scope pattern on the DRB III
T
with a typical 5 volt
square wave pattern.
Does the scope pattern match a typical 5 volt square wave signal scope pattern?
Yes
>> Replace the Transmission Control Module. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MOD-
ULES/TRANSMISSION CONTROL MODULE - REMOVAL).
Perform NAG1 TRANSMISSION VERIFICATION TEST.
No
>> Replace the N2 Input Speed Sensor. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC -
NAG1/ELECTROHYDRAULIC UNIT - REMOVAL).
Perform NAG1 TRANSMISSION VERIFICATION TEST.
11.
INTERMITTENT WIRING AND CONNECTORS
The condition that caused this DTC to set is currently not present. Inspect the related wiring harness for a possible
intermittent condition.
Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
Wiggle the wires while checking for shorts and open circuits.
Note: Check for any Technical Service Bulletins that may apply.
Were any problems found?
Yes
>> Repair as necessary.
Perform NAG1 TRANSMISSION VERIFICATION TEST.
No
>> Test Complete.
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NAG1 - ELECTRICAL DIAGNOSTICS
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(P0715) N3 INPUT SPEED SENSOR CIRCUIT
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NAG1 - ELECTRICAL DIAGNOSTICS
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(P0715) N3 INPUT SPEED SENSOR CIRCUIT (CONTINUED)
When Monitored and Set Condition
•
When Monitored: Engine speed greater than 450 RPM, no engine speed DTCs, no TCM undervoltage system
operation, no output speed sensor DTCs (signal from the ABS system), all wheel speeds above 250 RPM
(signal from the ABS system), no rear wheel speed DTCs (signal from the ABS system), and no wheel slip
detected (signal from the ABS system), no shifting operation, detected gear is 3rd or 4th and the detected gear
is the actual vehicle gear.
•
Set Condition: If the N3 input speed sensor signal is equal to 0 RPM, short signal circuit to ground, shorted to
battery, an open input speed sensor, a faulty input speed sensor, or an open sensor supply circuit.
POSSIBLE CAUSES
SENSOR SUPPLY VOLTAGE CIRCUIT OPEN
N3 INPUT SPEED SENSOR SIGNAL CIRCUIT OPEN
N3 INPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO GROUND
N3 SPEED SENSOR SIGNAL CIRCUIT SHORT TO ANOTHER CIRCUIT
SENSOR GROUND CIRCUIT OPEN
SENSOR GROUND CIRCUIT SHORT TO GROUND
SENSOR GROUND CIRCUIT SHORT TO ANOTHER CIRCUIT
N3 INPUT SPEED SENSOR
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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NAG1 - ELECTRICAL DIAGNOSTICS
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(P0715) N3 INPUT SPEED SENSOR CIRCUIT (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 11
3.
SENSOR SUPPLY VOLTAGE CIRCUIT OPEN
Turn the ignition off.
Disconnect the TCM C2 harness connector.
Disconnect the Transmission Solenoid Assembly harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the Sensor Supply Voltage circuit from the
TCM C2 harness connector to the Transmission Solenoid Assembly
harness connector.
Is the resistance below 5.0 ohms?
Yes
>>
Go To 4
No
>> Repair the Sensor Supply Voltage circuit for an open.
Perform NAG1 TRANSMISSION VERIFICATION TEST.
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NAG1 - ELECTRICAL DIAGNOSTICS
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