Page 1388 of 5267
P1282-FUEL PUMP/SYSTEM RELAY CONTROL CIRCUIT
For a complete wiring diagramRefer to Section 8W.
Page 1391 of 5267
P1294-TARGET IDLE NOT REACHED
For a complete wiring diagramRefer to Section 8W.
Page 1394 of 5267
P1296-NO 5-VOLTS TO MAP SENSOR
For a complete wiring diagramRefer to Section 8W.
Page 1398 of 5267
P1297-NO CHANGE IN MAP FROM START TO RUN
For a complete wiring diagramRefer to Section 8W.
Page 1403 of 5267
P1388-AUTO SHUTDOWN RELAY CONTROL CIRCUIT
For a complete wiring diagramRefer to Section 8W.
Page 1406 of 5267
P1389-NO ASD RELAY OUTPUT VOLTAGE AT PCM
For a complete wiring diagramRefer to Section 8W.
Page 1409 of 5267
P1391-INTERMITTENT LOSS OF CMP OR CKP
For a complete wiring diagramRefer to Section 8W.
Page 1412 of 5267
7.CKP WIRE HARNESS INSPECTION
Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.
Ensure the Crankshaft Position Sensor and the Camshaft Position Sensor are properly installed and the mounting
bolt(s) are torqued to specification.
Refer to any TSB that may apply.
Were any of the above conditions present?
Ye s>>
Repair as necessary
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No>>
Go To 8
8.TONE WHEEL/FLEX PLATE INSPECTION
Remove the Crankshaft Position Sensor.
Inspect the Tone Wheel/Flex Plate slots for damage, foreign material, or excessive movement.
Were any problems found?
Ye s>>
Repair or replace the Tone Wheel/Flex Plate as necessary.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No>>
Go To 9
9.CRANKSHAFT POSITION SENSOR
If there are no possible causes remaining, view repair.
Repair
Replace the Crankshaft Position Sensor.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
10.CHECKING CKP SIGNAL WITH LAB SCOPE
NOTE: The conditions that set this DTC are not present at this time. The following test may help in identi-
fying the intermittent condition.
Turn the ignition off.
With the scan tool as a Dual Channel Lab Scope and the Miller special tool #6801, backprobe the (K24) CKP Signal
circuit in the PCM harness connector and CKP harness connector.
WARNING: When the engine is operating, do not stand in a direct line with thefan. Do not put your hand
near the pulleys, belts, or fan. Do not wear loose clothing.
Start the engine.
Carefully wiggle the related wire harness and gently tap on the CKP sensor.
Compare the Channel 1 reading to the Channel 2 reading on the lab scope screen.
Both of the readings should be the same.
Were any of the above conditions present?
Ye s>>
Repair the wiring or connector concern.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No>>
Te s t C o m p l e t e .
