DaimlerChrysler Jeep Grand Cherokee 2002, Service Manual

Page: 248 / 284

TEST ACTION APPLICABILITY
9 Using a 12-volt test light connected to ground, check the Ignition Switch Start
Output circuit at ECM C1 harness connector cavity 22 while turning the ignition
switch to the START position.
Does the test light illuminate with the ignition switch in the START position? All
Yes
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform NO START VERIFICATION - VER-1.
No
→
Repair the Ignition Switch Start Output circuit at the ECM
harness connector for an open.
Perform NO START VERIFICATION - VER-1.
10 Remove the Starter Relay from the PDC.
Using a 12-volt test light connected to ground, check the Fused B+ circuit in the
Starter Relay connector in the PDC.
Is the test light on? All
Yes
→
Go To 11
No
→
Repair the Fused B(+) circuit for an open.
Perform NO START VERIFICATION - VER-1.
11 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? All
Yes
→
Go To 12
No
→
Repair the Starter Relay Output circuit for an open.
Perform NO START VERIFICATION - VER-1.
12 Using the Service Information, check the battery cables for high resistance.
Did either battery cable have a voltage drop greater than 0.2 volts? All
Yes
→
Replace the battery cable(s).
Perform NO START VERIFICATION - VER-1.
No
→
Go To 13
13 Turn the ignition off.
Attempt to manually rotate the crankshaft 360°.
Is the crankshaft able to rotate 360°? All
Yes
→
Replace the Starter Motor.
Perform NO START VERIFICATION - VER-1.
No
→
Repair the engine mechanical problem.
Perform NO START VERIFICATION - VER-1.
240
DRIVEABILITY - DIESEL
*ENGINE WILL NOT CRANK —
Continued
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