Jeep Liberty KJ. Manual — part 656
12.
CLUTCH INTERLOCK SWITCH
Turn the ignition off.
Remove the Starter Relay from the PDC.
Disconnect the Clutch Interlock Switch harness connector.
Connect a jumper wire across the Clutch Interlock Switch harness con-
nector.
Using a 12-volt test light connected to ground, check the Ignition Switch
Start Output circuit at the Starter Relay connector in the PDC and turn-
ing the ignition switch to the Start position.
Does the test light illuminate with the ignition switch in the
Start position?
Yes
>> Replace the Clutch Interlock Switch.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Go To 13
13.
CLUTCH INTERLOCK SWITCH OUTPUT CIRCUIT OPEN
Turn the ignition off.
Disconnect the Clutch Interlock Switch harness connector.
Remove the Starter Relay from the PDC.
Measure the resistance of the Clutch Interlock Switch Output circuit
between the PDC and the Clutch Interlock Switch harness connector.
Is the resistance below 10.0 ohms?
Yes
>> Repair the Ignition Switch Start Output circuit to the Clutch
Interlock Switch.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Repair the Clutch Interlock Switch Output circuit for an
open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
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KJ
14.
OPEN FUSED BATTERY (+) CIRCUIT
Remove the Starter Relay from the PDC.
Using a 12-volt test light connected to ground, check the (cavity 30)
Fused B+ circuit in the Starter Relay connector in the PDC.
Is the test light on?
Yes
>> Go To 15
No
>> Repair the Fused B(+) circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
15.
STARTER RELAY OUTPUT CIRCUIT OPEN
Turn the ignition off.
Remove the Starter Relay from the PDC.
Disconnect the Starter Relay Output wire from the Starter Solenoid.
Connect the Starter Relay Output wire (at the Starter) to ground.
Using a 12-volt test light connected to 12-volts, check the Starter Relay
Output circuit at the Starter Relay connector in the PDC.
Does the test light illuminate brightly?
Yes
>> Go To 16
No
>> Repair the Starter Relay Output circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
16.
BATTERY CABLE HIGH RESISTANCE
Using the Service Information, check the battery cables for high resistance.
Did either battery cable have a voltage drop greater than 0.2 volts?
Yes
>> Replace the battery cable(s).
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Go To 17
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ENGINE DIESEL DIAG
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17.
MECHANICAL PROBLEM
Turn the ignition off.
Attempt to manually rotate the crankshaft 360°.
Is the crankshaft able to rotate 360°?
Yes
>> Replace the Starter Motor.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Repair the engine mechanical problem.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
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*LACK OF ENGINE POWER
For a complete wiring diagram Refer to Section 8W
Possible Causes
AIR IN FUEL SYSTEM
BOOST CONTROL VACUUM SUPPLY
CHECK FOR ECM DTCS
CHECKING ECM POWER AND GROUNDS
CHECKING FOR AIR LEAKS
CHECKING THE FUEL DELIVERY SYSTEM
SCAN TOOL TESTS
ENGINE DRIVE BELT/CHAIN
FUEL INJECTOR(S)
FUEL PRESSURE SOLENOID
FUEL PRESSURE SOLENOID
FUEL PUMP
FUEL SYSTEM CONTAMINATION
FUEL SYSTEM LEAK
TURBOCHARGER
Diagnostic Test
1.
CHECKING FOR ECM DTCS
WARNING: HIGH-PRESSURE FUEL LINES DELIVER DIESEL FUEL UNDER EXTREME PRESSURE FROM THE
INJECTION PUMP TO THE FUEL INJECTORS. THIS MAY BE AS HIGH AS 23,200 PSI (1600 BAR). USE
EXTREME CAUTION WHEN INSPECTING FOR HIGH-PRESSURE FUEL LEAKS.
WARNING: FUEL UNDER THIS AMOUNT OF PRESSURE CAN PENETRATE SKIN CAUSING PERSONAL
INJURY OR DEATH. INSPECT FOR HIGH-PRESSURE FUEL LEAKS WITH A SHEET OF CARDBOARD. WEAR
SAFETY GOGGLES AND ADEQUATE PROTECTIVE CLOTHING WHEN SERVICING FUEL SYSTEM.
Turn the ignition on.
With the scan tool, read the ECM DTCs.
Are there any DTCs present?
Yes
>> Refer to symptom list for problems related to this DTC.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Go To 2
2.
CHECKING BOOST PRESSURE
NOTE: This test requires two people. One person to test drive the vehicle while a technician observes the
scan tool readings
With the scan tool, read and compare the Boost Pressure (PSI) with the Boost Pressure Desired/Setpoint (PSI)
while test driving the vehicle under various load conditions such as idle, hard acceleration, cruise and deceleration.
NOTE: The Boost Pressure reading should directionally follow (trail) the Boost Pressure Desired/Setpoint
reading.
Does the Boost Pressure reading follow the Boost Pressure Desired/Setpoint reading?
Yes
>> Go To 3
No
>> Go To 15
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ENGINE DIESEL DIAG
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