Driveability - Diesel - Non-Dtc-Based Diagnostics: Other Jeep Liberty II

CHECKING THE ENGINE MECHANICAL SYSTEMS

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CHECKING THE EGR SYSTEM

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ENGINE CRANKS BUT WILL NOT START

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ENGINE WILL NOT CRANK

For complete wiring diagrams, refer to SYSTEM WIRING DIAGRAMS .

Scheme 55

Scheme 56

Scheme 57

Scheme 58

Scheme 59

Scheme 60

1. BATTERY CABLES NOTE: The battery must be fully charged before diagnosing a no crank condition. Turn the ignition off. Inspect the battery cables for corrosion, looseness or other problems. Is there evidence of problems? Yes Repair as necessary. Perform the ECM VERIFICATION TEST. Refer to «DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure»(ref-350096-S37095296402009121400000) . No Go to step 2
2. 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. Refer to «DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure»(ref-350096-S37095296402009121400000) . No Go to step 3
3. TIPM CAN BUS CODES PRESENT With the scan tool, read the TIPM DTCs. NOTE: If there are CAN BUS related problems the TIPM will not supply power to the Starter Relay coil. Does the scan tool display any CAN Bus related DTCs in the TIPM? Yes Refer to «DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Diagnosis and Testing»(ref-350093-S06268540512009121400000) for problems related to CAN Bus communication. Perform the ECM VERIFICATION TEST. Refer to «DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure»(ref-350096-S37095296402009121400000) . No Go to step 4
4. CHECKING STARTER OPERATION Turn the ignition off. Remove the Starter Relay from the TIPM. 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 TIPM connector. Did the engine crank? Yes Go to step 5 No Go to step 10
5. STARTER RELAY Install a known good 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. Refer to «DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure»(ref-350096-S37095296402009121400000) . No Go to step 6
6. CHECK POWER AND GROUNDS See «Non-DTC Diagnostics/Driveability - Diesel - Diagnosis and Testing»(ref-350101-S38901574232009121400000) and perform the CHECKING THE ECM POWER AND GROUND test. Were any problem found with the ECM powers and grounds? Yes Repair as necessary. Perform the ECM VERIFICATION TEST. Refer to «DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure»(ref-350096-S37095296402009121400000) . No Go to step 7
7. STARTER COIL DRIVE CIRCUIT (INTERNAL TIPM) Turn the ignition off. Remove the Starter Relay from the TIPM. Using a 12-volt test light connected to ground, check the Starter Coil Driver circuit in the Starter Relay connector while turning the ignition switch to the START position. Does the test light illuminate with the ignition switch in the START position? Yes Go to step 8 No Check the TIPM ignition supply circuits and fuses. If TIPM fuses and ignition supply circuits are OK, replace the TIPM. Perform the ECM VERIFICATION TEST. Refer to «DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure»(ref-350096-S37095296402009121400000) .
8. (T752) STARTER RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the ECM harness connectors. Remove the ASD Relay from the TIPM. Using a jumper wire, connect ASD Relay connector cavities 30 and 87 in the TIPM. Turn the ignition on. Measure the voltage of the (T752) Starter Relay Control circuit. Is the voltage above 1.0 volt? Yes Repair the (T752) Starter Relay Control circuit for a short to voltage. Perform the ECM VERIFICATION TEST. Refer to «DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure»(ref-350096-S37095296402009121400000) . No Go to step 9
9. (T752) Starter Relay Control Circuit Open Turn The Ignition Off. Remove The Jumper Wire And Install The ASD Relay. Measure The Resistance Of The (T752) Starter Relay Control Circuit Between The ECM Harness Connector And The Starter Relay Connector In The TIPM. Is The Resistance Below 10.0 Ohms? Yes Replace The Engine Control Module In Accordance With The Service Information. Perform The ECM VERIFICATION TEST. Refer To «DTC-Based Diagnostics/Module, Engine Control (ECM) - Standard Procedure»(ref-350096-S37095296402009121400000) . No Repair The (T752) Starter Relay Control Circuit For An Open.
10. FUSED B(+) CIRCUIT OPEN Using a 12-volt test light connected to ground, check the Fused B(+) circuit in the Starter Relay connector in the TIPM. Is the test light on? Yes Go to step 11 No Repair the Fused B(+) circuit for an open. Perform the ECM VERIFICATION TEST. Refer to «DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure»(ref-350096-S37095296402009121400000) .
11. (T750) STARTER RELAY OUTPUT CIRCUIT OPEN Disconnect the (T750) Starter Relay Output wire from the Starter Solenoid. Connect the (T750) Starter Relay Output wire (at the Starter) to ground. Using a 12-volt test light connected to 12-volts, check the (T750) Starter Relay Output circuit at the Starter Relay connector in the TIPM. Does the test light illuminate brightly? Yes Go to step 12 No Repair the (T750) Starter Relay Output circuit for an open. Perform the ECM VERIFICATION TEST. Refer to «DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure»(ref-350096-S37095296402009121400000) .
12. 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. Refer to «DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure»(ref-350096-S37095296402009121400000) . No Repair the engine mechanical problem. Perform the ECM VERIFICATION TEST. Refer to «DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure»(ref-350096-S37095296402009121400000) .

LACK OF ENGINE POWER

For complete wiring diagrams, refer to SYSTEM WIRING DIAGRAMS .