Jeep Liberty KJ. Manual — part 655
Possible Causes
BATTERY CABLE HIGH RESISTANCE
BATTERY CABLES
CLUTCH INTERLOCK SWITCH
CLUTCH INTERLOCK SWITCH OUTPUT CIRCUIT
IGNITION SWITCH START OUTPUT CIRCUIT OPEN
MECHANICAL PROBLEM
OPEN FUSED BATTERY (+) CIRCUIT
OPEN IGNITION SWITCH START OUTPUT
P/N SWITCH
P/N SWITCH CIRCUIT OPEN
P/N SWITCH GROUND CIRCUIT OPEN
SKIM CODES PRESENT
STARTER MOTOR
STARTER RELAY
STARTER RELAY
STARTER RELAY GROUND CIRCUIT OPEN
STARTER RELAY OUTPUT CIRCUIT OPEN
Diagnostic Test
1.
BATTERY CABLES
Turn the ignition off.
NOTE: The battery must be fully charged before diagnosing a no crank condition.
Inspect the battery cables for corrosion, looseness or other problems.
Is there evidence of problems?
Yes
>> Repair as necessary.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Go To 2
2.
SKIM CODES PRESENT
Turn the ignition on.
With the scan tool, read the SKIM DTCs.
Does the scan tool display any SKIM DTCs?
Yes
>> Refer to symptom list for problems related to SKIM.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Go To 3
9 - 678
ENGINE DIESEL DIAG
KJ
3.
AUTOMATIC OR MANUAL TRANSMISSION
Is the vehicle equipped with an automatic transmission?
Yes
>> Go To 4
No
>> Go To 9
4.
CHECKING STARTER OPERATION
Turn the ignition off.
Remove the Starter Relay from the PDC.
WARNING: THE TRANSMISSION MUST BE IN PARK/NEUTRAL AND
THE PARK BRAKE MUST BE SET FOR THIS TEST.
WARNING: THE ENGINE MAY CRANK IN THE NEXT STEP. WHEN
THE ENGINE IS CRANKING, DO NOT STAND IN A DIRECT LINE
WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS,
BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
Momentarily jumper Starter Relay connector cavities 30 and 87 in the
PDC connector.
Did the engine crank?
Yes
>> Go To 5
No
>> Go To 14
5.
OPEN IGNITION SW START CIRCUIT
Place the transmission in Park or Neutral.
Remove the Starter Relay from the PDC.
Using a 12-volt test light connected to ground, check the Ignition Switch
Start Output circuit while turning the ignition switch to the START posi-
tion.
Does the test light illuminate with the ignition switch in the
START position?
Yes
>> Go To 6
No
>> Repair the Ignition Switch Start Output circuit between the
Starter Relay and the ECM for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
KJ
ENGINE DIESEL DIAG
9 - 679
6.
STARTER RELAY
Turn the ignition off.
Remove the Starter Relay from the PDC.
Install a substitute relay in place of the Starter Relay.
Attempt to start the engine.
Does the engine crank?
Yes
>> Replace the Starter Relay.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Go To 7
7.
TRS SWITCH
Use the scan tool to monitor the status of the Transmission Range Switch (TRS).
Shift the vehicle from park to neutral.
Does the TRS status change?
Yes
>> Go To 8
No
>> Replace the TRS in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
8.
TRS CIRCUIT OPEN/SHORT
Turn the ignition off.
Disconnect the TRS harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the (T41) TRS
sense circuit.
Does the test light illuminate brightly?
Yes
>> Repair the (T41) Switch Sense circuit between the (T41)
TRS Switch and the (cavity B17) ECM.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Repair the P/N Switch Ground circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
9 - 680
ENGINE DIESEL DIAG
KJ
9.
CHECKING STARTER OPERATION
Turn the ignition off.
Remove the Starter Relay from the PDC.
WARNING: THE TRANSMISSION MUST BE IN NEUTRAL AND THE
PARK BRAKE MUST BE SET FOR THIS TEST.
WARNING: THE ENGINE MAY CRANK IN THE NEXT STEP. WHEN
THE ENGINE IS CRANKING, DO NOT STAND IN A DIRECT LINE
WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS,
BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
Momentarily jumper Starter Relay connector cavities 30 and 87 in the
PDC connector.
Did the engine crank?
Yes
>> Go To 10
No
>> Go To 14
10.
OPEN IGNITION SW START CIRCUIT
Remove the Starter Relay from the PDC.
Using a 12-volt test light connected to ground, check the (Cavity 86)
Ignition Switch Start Output circuit while fully depressing the clutch
pedal and turning the ignition switch to the START position.
Does the test light illuminate with the ignition switch in the
START position?
Yes
>> Go To 11
No
>> Go To 12
11.
STARTER RELAY
Turn the ignition off.
Remove the Starter Relay from the PDC.
Install a substitute relay in place of the Starter Relay.
Attempt to start the engine.
Does the engine crank?
Yes
>> Replace the Starter Relay.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Repair the Starter Relay Ground Circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
KJ
ENGINE DIESEL DIAG
9 - 681
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст