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TEST ACTION APPLICABILITY
7 Ignition Off.
At the CKP Sensor, backprobe the CKP Sensor Signal Circuit with the Oscilloscope's
voltage measurement lead.
Start the Engine and observe the CKP Sensor voltage pattern on the Oscilloscope.
Are any Crankshaft Position Sensor Signals missing?ENGINE - 3.3L V6
and/or ENGINE -
3.8L V6 and/or EN-
GINE - 3.3L V6
FFV
Ye s®Go To 8
No®Go To 11
8 Ignition Off.
Disconnect the CKP Sensor Connector.
Note: Check connectors - Clean/repair as necessary.
Inspect all Terminals.
Is any Terminal damaged, pushed out or miswired?ENGINE - 3.3L V6
and/or ENGINE -
3.8L V6 and/or EN-
GINE - 3.3L V6
FFV
Ye s®Repair Terminal(s) for damage, pushout or miswiring.
Perform Powertrain Verification Test VER-5A.
No®Go To 9
9 Ignition Off.
Disconnect the PCM.
Note: Check connectors - Clean/repair as necessary.
Inspect all Terminals.
Is any Terminal damaged, pushed out or miswired?ENGINE - 3.3L V6
and/or ENGINE -
3.8L V6 and/or EN-
GINE - 3.3L V6
FFV
Ye s®Repair Terminal(s) for damage, pushout or miswiring.
Perform Powertrain Verification Test VER-5A.
No®Go To 10
10 Ignition Off
Remove the Crankshaft Position (CKP) Sensor.
Inspect the Slots in the Flywheel for debris or damage.
Is the Flywheel damaged?ENGINE - 3.3L V6
and/or ENGINE -
3.8L V6 and/or EN-
GINE - 3.3L V6
FFV
Ye s®Repair or replace as necessary.
Perform Powertrain Verification Test VER-5A.
No®Replace the Crankshaft Position Sensor.
Perform Powertrain Verification Test VER-5A.
11 Start Engine.
At PCM, backprobe CKP Sensor Signal Circuit with Oscilloscope's voltage measure-
ment lead.
While observing the Oscilloscope pattern, wiggle CKP Sensor Circuit from Sensor to
PCM.
Were any CKP Sensor Signals missing when the wiggle test was conducted?ENGINE - 3.3L V6
and/or ENGINE -
3.8L V6 and/or EN-
GINE - 3.3L V6
FFV
Ye s®Note where wiggling the wires caused a missing CKP Sensor
signal. Repair Camshaft and Crankshaft Wire Harness as neces-
sary.
Perform Powertrain Verification Test VER-5A.
No®Test Complete.
193
DRIVEABILITY
P-1391 INTERMITTENT LOSS OF CMP OR CKP ÐContinued
ProCarManuals.com
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TEST ACTION APPLICABILITY
17 Ignition Off.
At the CKP Sensor, backprobe the CKP Sensor Signal Circuit with the Oscilloscope's
voltage measurement lead.
Start the Engine and observe the CKP Sensor voltage pattern on the Oscilloscope.
Are any Crankshaft Position Sensor Signals missing?ENGINE - 3.0L V6
Ye s®Go To 18
No®Go To 21
18 Ignition Off.
Disconnect the CKP Sensor Connector.
Note: Check connectors - Clean/repair as necessary.
Inspect all Terminals.
Is any Terminal damaged, pushed out or miswired?ENGINE - 3.0L V6
Ye s®Repair Terminal(s) for damage, pushout or miswiring.
Perform Powertrain Verification Test VER-5A.
No®Go To 19
19 Ignition Off.
Disconnect the PCM.
Note: Check connectors - Clean/repair as necessary.
Inspect all Terminals.
Is any Terminal damaged, pushed out or miswired?ENGINE - 3.0L V6
Ye s®Repair Terminal(s) for damage, pushout or miswiring.
Perform Powertrain Verification Test VER-5A.
No®Go To 20
20 Ignition Off.
Remove the Crankshaft Position (CKP) Sensor.
Inspect the Slots in the Flywheel for debris or damage.
Is the Flywheel damaged?ENGINE - 3.0L V6
Ye s®Repair or replace as necessary.
Perform Powertrain Verification Test VER-5A.
No®Replace the Crankshaft Position Sensor.
Perform Powertrain Verification Test VER-5A.
21 Start Engine.
At PCM, backprobe CKP Sensor Signal Circuit with Oscilloscope's voltage measure-
ment lead.
While observing the Oscilloscope pattern, wiggle CKP Sensor Circuit from Sensor to
PCM.
Were any CKP Sensor Signals missing when the wiggle test was conducted?ENGINE - 3.0L V6
Ye s®Note where wiggling the wires caused a missing CKP Sensor
signal. Repair Camshaft and Crankshaft Wire Harness as neces-
sary.
Perform Powertrain Verification Test VER-5A.
No®Test Complete.
195
DRIVEABILITY
P-1391 INTERMITTENT LOSS OF CMP OR CKP ÐContinued
ProCarManuals.com
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Symptom:
P-1698 NO CCD MESSAGES FROM TCM
When Monitored and Set Condition:
P-1698 NO CCD MESSAGES FROM TCM
When Monitored: With the engine running.
Set Condition: No CCD messages are received from the TCM for 10 seconds.
POSSIBLE CAUSES
DRB DOES NOT SHOW BUS OPERATIONAL
CCD WIRING HARNESS OBSERVABLE DEFECT
CCD BUS (+) CIRCUIT OPEN BETWEEN PCM AND TCM
CCD BUS (-) CIRCUIT OPEN BETWEEN PCM AND TCM
PCM DEFECTIVE (NO CCD MESSAGE)
TCM DEFECTIVE (NO CCD MESSAGE)
TEST ACTION APPLICABILITY
1 Ignition On
With the DRB, select9Transmission9.
Note: The CCD Bus test is automatic.
Does the DRB show9Bus Operational9?All
Ye s®Go To 2
No®Go to the appropriate symptom group for body diagnostics.
2 Ignition Off
With the DRB, select9Engine9module.
With the DRB erase trouble codes.
Raise all four wheels off the ground and properly support the vehicle.
Caution: Keep clear of rotating wheels in the next step.
Start the engine. Place the Shift Lever in Drive and allow the wheels to rotate for 1
minute.
Step on the brakes, put the Shift Lever back in Park.
With the DRB read Trouble Codes.
Does display show9No CCD Message from TCM9and the start run counter equal to
zero?All
Ye s®Go To 3
No®Go To 7
224
DRIVEABILITY
ProCarManuals.com
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TEST ACTION APPLICABILITY
3 Ignition Off
Check Transmission Fluid level and ensure it is clear of any debris.
Is the Transmission Fluid okay?TRANSMISSION -
AUTOMATIC
3-SPD, 31TH
Ye s®Go To 4
No®Repair as necessary.
Perform Powertrain Verification Test VER-5A.
4 Ignition Off
Disconnect the TCC Solenoid connector.
Note: Check connectors - Clean/repair as necessary.
Turn key on.
Use a Voltmeter in the following step.
Using a Voltmeter, measure the Fused Ignition Switch Output Circuit at Solenoid
Connector.
Is the voltage above 10.0 volts?TRANSMISSION -
AUTOMATIC
3-SPD, 31TH
Ye s®Go To 5
No®Repair the open Fused Ignition Switch Output Circuit.
Perform Powertrain Verification Test VER-5A.
5 Ignition Off
Disconnect the TCC Solenoid connector.
Note: Check connectors - Clean/repair as necessary.
With an Ohmmeter, measure across the Solenoid for resistance.
Was resistance between 30.0 and 50.0 ohms?TRANSMISSION -
AUTOMATIC
3-SPD, 31TH
Ye s®Go To 6
No®Replace TCC Solenoid.
Perform Powertrain Verification Test VER-5A.
6 Drive Vehicle
Maintain 50 MPH per DRB. Wait 10 seconds in lockup. Record Engine RPM.
Was engine RPM 2200 +/- 50 RPM?TRANSMISSION -
AUTOMATIC
3-SPD, 31TH
Ye s®Go To 7
No®Inspect Differential, Output Shaft, or Gear Box. Refer to service
instructions for proper diagnosis.
Perform Powertrain Verification Test VER-5A.
7 Ignition Off
Remove VSS.
Note: Check connectors - Clean/repair as necessary.
Inspect sensor and gear for damage, also improper wheel size.
Were any problems found?TRANSMISSION -
AUTOMATIC
3-SPD, 31TH
Ye s®Repair as necessary.
Perform Powertrain Verification Test VER-5A.
No®Test Complete.
303
TRANSMISSION
P-0740 TORQUE CONV CLUTCH, NO RPM DROP AT LOCKUP ÐContinued
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