Chrysler Town, Dodge Caravan. Manual — part 1169
TEST
ACTION
APPLICABILITY
5
Turn the ignition off.
Disconnect all the Glow Plug harness connectors.
Remove the Glow Plug Relay.
Measure the resistance between ground and the Glow Plug Relay Output circuit.
Is the resistance above 1000 ohms?
All
Yes
→ Go To 6
No
→ Repair the Glow Plug Relay Output circuit for a short to ground.
Inspect the fuse or fuselink and replace as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
6
Turn the ignition off.
Disconnect all the Glow Plug harness connectors.
Remove the Glow Plug Relay.
Connect a jumper wire across Glow Plug Relay connector cavities 30 and 87.
Using a 12-volt test light connected to ground, check the Glow Plug Relay Output
circuit at each Glow Plug harness connector.
Is the test light on at each Glow Plug harness connector?
All
Yes
→ Go To 7
No
→ Repair the Glow Plug Relay Output circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
7
Refer to the Service Information and perform the Glow Plug Test.
Are all Glow Plugs operating properly?
All
Yes
→ Go To 8
No
→ Replace the Glow Plug(s) as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
8
If there are no possible causes remaining, view repair.
All
Repair
Replace the Glow Plug Relay.
Perform ROAD TEST VERIFICATION - VER-2.
219
DRIVEABILITY - DIESEL
*CHECKING THE GLOW PLUG OPERATION —
Continued
Symptom:
*CHECKING THE LIFT PUMP MOTOR OPERATION
POSSIBLE CAUSES
LIFT PUMP OUTPUT TEST
FUSED B+ CIRCUIT OPEN
FUEL LIFT PUMP RELAY
LIFT PUMP RELAY OUTPUT CIRCUIT SHORTED TO VOLTAGE
LIFT PUMP RELAY OUTPUT CIRCUIT SHORTED TO GROUND
LIFT PUMP RELAY OUTPUT CIRCUIT OPEN
LIFT PUMP GROUND CIRCUIT OPEN
LIFT PUMP MOTOR
TEST
ACTION
APPLICABILITY
1
NOTE: If any Fuel Lift Pump DTCs are present, diagnose the DTCs first.
Turn the ignition on.
With the DRB, actuate the Lift Pump Relay.
Gain access to the Lift Pump Motor to determine if it is cycling on and off.
Does the Lift Pump Motor cycle on and off?
All
Yes
→ Go To 2
No
→ Go To 3
2
NOTE: The Lift Pump fuel output must be sufficient to prime the Injector
Pump.
Refer to the Service Information to test the Lift Pump pressure and volume output.
Did the Lift Pump pass the Lift Pump pressure and volume test?
All
Yes
→ Test Complete.
No
→ Repair as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
3
NOTE: If the Lift Pump Relay fuse is open, refer to the system schematics
for all circuits that are powered by the Lift Pump Relay fuse to determine
the cause of the blown fuse.
Remove the Lift Pump Relay from the IPM.
Using a 12-volt test light connected to ground, probe the Fused B+ circuit in the Lift
Pump Relay connector in the IPM.
Does the test light illuminate brightly?
All
Yes
→ Go To 4
No
→ Repair the Fused B+ (Fuse) circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
220
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Install a substitute relay in place of the Lift Pump Relay.
Turn the ignition on.
With the DRB, actuate the Lift Pump Relay.
Does the Lift Pump Motor cycle on and off?
All
Yes
→ Replace the Fuel Lift Pump Relay.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the Lift Pump Motor harness connector.
Remove the Lift Pump Relay.
Turn the ignition on.
Measure the voltage on the Lift Pump Relay Output circuit.
Is the voltage above 1.0 volt?
All
Yes
→ Repair the Lift Pump Relay Output circuit for a short to voltage.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Go To 6
6
Turn the ignition off.
Disconnect the Lift Pump Motor harness connector.
Remove the Lift Pump Relay.
Measure the resistance between ground and the Lift Pump Relay Output circuit.
Is the resistance above 100 kohms?
All
Yes
→ Go To 7
No
→ Repair the Lift Pump Relay Output circuit for a short to ground.
Inspect the fuse and replace as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
7
Turn the ignition off.
Disconnect the Lift Pump Motor harness connector.
Remove the Lift Pump Relay.
Connect a jumper wire across Lift Pump Relay connector cavities 30 and 87.
Using a 12-volt test light connected to ground, check the Lift Pump Relay Output
circuit in the Lift Pump Motor harness connector.
Is the test light illuminated brightly?
All
Yes
→ Go To 8
No
→ Repair the Lift Pump Relay Output circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
8
Turn the ignition off.
Disconnect the Lift Pump Motor harness connector.
Using a 12-volt test light connected to 12-volts, check the Lift Pump Ground circuit.
Is the test light illuminated brightly?
All
Yes
→ Go To 9
No
→ Repair the Lift Pump Ground circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
221
DRIVEABILITY - DIESEL
*CHECKING THE LIFT PUMP MOTOR OPERATION —
Continued
TEST
ACTION
APPLICABILITY
9
If there are no possible causes remaining, view repair.
All
Repair
Replace the Lift Pump Motor in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
222
DRIVEABILITY - DIESEL
*CHECKING THE LIFT PUMP MOTOR OPERATION —
Continued
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