DaimlerChrysler Jeep Grand Cherokee 2002, Service Manual

Page: 190 / 284

Symptom:
P1270-INTAKE PORT SWIRL ACTUATOR OPEN CIRCUIT
When Monitored and Set Condition:
P1270-INTAKE PORT SWIRL ACTUATOR OPEN CIRCUIT
When Monitored: With the ignition on.
Set Condition: The ECM does not detect voltage on the Intake Port Swirl Actuator
Control circuit.
POSSIBLE CAUSES
INTERMITTENT CONDITION
ASD RELAY OUTPUT CIRCUIT OPEN
SWIRL SOLENOID CONTROL CIRCUIT SHORTED TO GROUND
SWIRL SOLENOID CONTROL CKT OPEN
SWIRL SOLENOID
ENGINE CONTROL MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, erase ECM DTCs.
With the DRBIII
t
, actuate the Swirl Solenoid.
Monitor the DRB for ECM DTCs.
Did this DTC set again?
All
Yes
→
Go To 2
No
→
Go To 6
2 Turn the ignition off.
Disconnect the Swirl Solenoid harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the ASD Relay Output circuit.
Does the test light illuminate brightly? All
Yes
→
Go To 3
No
→
Repair the ASD Relay Output circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
3 Turn the ignition off.
Disconnect the Swirl Solenoid harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the Swirl Solenoid Control circuit.
Is the resistance above 1000 ohms? All
Yes
→
Go To 4
No
→
Repair the Swirl Solenoid Control circuit for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
182
DRIVEABILITY - DIESEL
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