Page 4011 of 4284

TEST ACTION APPLICABILITY
3 Turn the ignition off.
Disconnect the Leak Detection Pump harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the Ignition Switch Output
circuit in the LDP harness connector.
Does the test light illuminate brightly?All
Ye s®Go To 4
No®Repair the Fused Ignition Switch Output circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 6.
4 Turn the ignition off.
Disconnect the Leak Detection Pump harness connector.
Disconnect the Powertrain Control Module harness connector.
Measure the resistance of the LDP Solenoid Control circuit in the LDP harness
connector to ground.
Is the resistance below 5.0 Ohms?All
Ye s®Repair the LDP Solenoid Control circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 6.
No®Go To 5
5 Turn the ignition off.
Disconnect the Leak Detection Pump harness connector.
Disconnect the Powertrain Control Module harness connector.
Measure the resistance of the LDP Solenoid Control circuit between the LDP
Solenoid harness connector and the PCM harness connector.
Is the resistance below 5.0 Ohms?All
Ye s®Go To 6
No®Repair the LDP Solenoid Control circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 6.
6 If there are no possible causes remaining, view repair. All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 6.
7 At this time, the conditions required to set the DTC are not present.
Note: Use the Freeze Frame Data to help you duplicate the conditions that
set the DTC. Pay particular attention to the DTC set conditions, such as,
VSS, MAP, ECT, and Load.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wire harness connectors. Look for broken,
bent, pushed out, or corroded terminals.
Note: Refer to any Technical Service Bulletins (TSB's) that may apply.
Perform a wiggle test of the LDP wiring while the circuit is actuated with the DRB.
Listen for the LDP to quit actuating. Also watch for the Good Trip Counter to change
to 0.
Were any problems found?All
Ye s®Repair wiring harness/connectors as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 6.
No®Test Complete.
217
DRIVEABILITY - GAS
P1495-LEAK DETECTION PUMP SOLENOID CIRCUIT ÐContinued
Page 4021 of 4284
Symptom:
*CHECKING FUEL DELIVERY
POSSIBLE CAUSES
FUEL PUMP RELAY
FUEL PRESSURE OUT OF SPECS
RESTRICTED FUEL SUPPLY LINE
FUEL PUMP INLET STRAINER PLUGGED
FUEL PUMP MODULE
FUEL PUMP CAPACITY (VOLUME) OUT OF SPECS
FUEL PUMP RELAY FUSED B+ CIRCUIT
FUEL PUMP RELAY OUTPUT CIRCUIT OPEN
FUEL PUMP GROUND CIRCUIT OPEN/HIGH RESISTANCE
IPM FUSE & RELAY CENTER
FUEL PUMP MODULE
TEST ACTION APPLICABILITY
1NOTE: Inspect the Fuel Pump Relay fuse located in the IPM. If the Fuel
Pump Relay fuse is open, repair the cause of the open first before continu-
ing. Inspect the Fuel Pump Relay Output circuit for a short to ground for
the cause of the open fuse.
Turn the ignition on.
With the DRBIIIt, actuate the ASD Fuel System test.
Note: It may be necessary to use a mechanics stethoscope in the next step.
Listen for fuel pump operation at the fuel tank.
Does the Fuel Pump operate?All
Ye s®Go To 2
No®Go To 6
Caution: Stop All Actuations.
227
DRIVEABILITY - GAS
Page 4024 of 4284

TEST ACTION APPLICABILITY
9 Turn the ignition off.
Remove the Fuel Pump Relay from the IPM.
With a 12 volt test light connected to ground, probe the Fuel Pump Relay Fused B+
circuit at the IPM.
Does the test light illuminate?All
Ye s®Go To 10
No®Check for an open Fuel Pump fuse, repair cause of open. If OK,
replace the IPM Fuse & Relay Center.
Perform POWERTRAIN VERIFICATION TEST VER-1.
10 Turn the ignition off.
Disconnect the Fuel Pump Module harness connector.
Disconnect the IPM C8 harness connector.
Measure the resistance of the Fuel Pump Relay Output circuit from between the IPM
harness connector and the Fuel Pump Module harness connector.
Is the resistance below 5.0 ohms?All
Ye s®Go To 11
No®Repair the Fuel Pump Relay Output circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER-1.
11NOTE: Ensure all IPM harness connectors are connected.
Turn the ignition off.
Disconnect the Fuel Pump Module harness connector.
Remove the Fuel Pump Relay from the IPM.
Measure the resistance of the Fuel Pump Relay Output circuit between the IPM and
the Fuel Pump Module harness connector.
Is the resistance below 5.0 ohms?All
Ye s®Replace the Fuel Pump Relay.
Perform POWERTRAIN VERIFICATION TEST VER-1.
No®Replace the IPM Fused & Relay Center.
Perform POWERTRAIN VERIFICATION TEST VER-1.
230
DRIVEABILITY - GAS
*CHECKING FUEL DELIVERY ÐContinued
Page 4028 of 4284

Symptom:
*CHECKING PCM POWER AND GROUND CIRCUITS
POSSIBLE CAUSES
PCM FUSED B+ CIRCUIT
PCM FUSED IGNITION SWITCH OUTPUT CIRCUIT
PCM GROUND CIRCUITS
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Disconnect the PCM harness connector.
Using a 12-volt test light connected to ground, probe the PCM Fused B+ circuit in the
PCM harness connector.
Does the test light illuminate brightly?All
Ye s®Go To 2
No®Repair the Fused B+ circuit.
Perform POWERTRAIN VERIFICATION TEST VER-1.
2 Turn the ignition off.
Disconnect the PCM harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the PCM Fused Ignition Switch
Output circuit in the PCM harness connector.
Does the test light illuminate brightly?All
Ye s®Go To 3
No®Repair the Ignition Switch Output circuit
Perform POWERTRAIN VERIFICATION TEST VER-1.
3 Turn the ignition off.
Disconnect the PCM harness connector.
Using a 12-volt test light connected to battery voltage, probe the PCM ground circuits
in the PCM harness connector.
Does the test light illuminate brightly?All
Ye s®Test Complete.
No®Repair the PCM ground circuits.
Perform POWERTRAIN VERIFICATION TEST VER-1.
234
DRIVEABILITY - GAS
Page 4029 of 4284

Symptom:
*CHECKING RADIATOR FAN RELAY OUTPUT
POSSIBLE CAUSES
RADIATOR FAN RELAY OPERATION
GROUND CIRCUIT OPEN
RADIATOR FAN RELAY OUTPUT CIRCUIT
RADIATOR FAN ASSENBLY
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Disconnect the Radiator Fan Relay harness connector.
Using a jumper wire, momentarily jumper the Fuse B+ circuit and Radiator Fan
Relay Output circuit in the Radiator Fan Relay harness connector.
Are both Fans operating?All
Ye s®The Radiator Fan System operating properly at this time.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No®Go To 2
2 Turn the ignition off.
Disconnect the Radiator Fan harness connector.
Measure both Ground circuit in the Radiator Fan Motor harness connectors to
ground.
Is the resistance below 5.0 ohms?All
Ye s®Go To 3
No®Repair the Ground circuit(s) for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
3 Turn the ignition off.
Disconnect the Radiator Fan Relay harness connector.
Disconnect both Radiator Fan Motor harness connectors.
Using a jumper wire, jumper the Fused B+ circuit and the Radiator Fan Output
circuit in the Radiator Fan Relay harness connector.
Measure the voltage in both Radiator Fan Motor harness connectors.
Is the voltage above 10 volts?All
Ye s®Replace the Radiator Fan Assembly.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No®Repair the Radiator Fan Relay Output circuit(s) for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
235
DRIVEABILITY - GAS
Page 4030 of 4284

Symptom:
*CHECKING THE A/C RELAY OUTPUT
POSSIBLE CAUSES
A/C CLUTCH RELAY OPERATION
GROUND CIRCUIT OPEN
A/C CLUTCH
FUSED B+ CIRCUIT
A/C CLUTCH OUTPUT CIRCUIT
IPM FUSE & RELAY CENTER
A/C CLUTCH RELAY
TEST ACTION APPLICABILITY
1NOTE: Ensure that the refrigerant system is properly charged. Refer to the
appropriate Service Information.
Turn the ignition on.
With the DRBIIIt, actuate the A/C Clutch Relay.
Is the A/C Clutch actuating?All
Ye s®The A/C Clutch System operating properly at this time.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No®Go To 2
2 Turn the ignition off.
Disconnect the A/C Clutch harness connector.
Measure the Ground circuit in the A/C Clutch harness connector to ground.
Is the resistance below 5.0 ohms?All
Ye s®Go To 3
No®Repair the Ground circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
3 Disconnect the A/C Clutch harness connector.
Turn the ignition on.
With the DRBIIIt, actuate the A/C Clutch Relay.
Measure the voltage of the A/C Clutch Relay Output circuit in the A/C Clutch harness
connector.
Is the voltage above 11.0 volts?All
Ye s®Replace the A/C Clutch.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No®Go To 4
236
DRIVEABILITY - GAS
Page 4031 of 4284

TEST ACTION APPLICABILITY
4 Turn the ignition off.
Remove the A/C Clutch Relay from the IPM.
Using a 12-volt test light connected to ground, probe the Fused B+ circuit in the IPM.
Does the test light illuminate brightly?All
Ye s®Go To 5
No®Check for an open A/C Clutch fuse, repair the cause of the open
fuse. If OK, replace the IPM Fuse & Relay Center.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
5 Turn the ignition off.
Disconnect the IPM C3 harness connector.
Disconnect the A/C Clutch harness connector.
Measure the resistance of the A/C Clutch Relay Output circuit between the IPM
harness connector and the A/C Clutch harness connector.
Is the resistance below 5.0 ohms?All
Ye s®Go To 6
No®Repair the A/C Clutch Relay Output circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
6NOTE: Ensure all IPM harness connectors are connected.
Turn the ignition off.
Disconnect the A/C Clutch harness connector.
Remove the A/C Clutch Relay from the IPM.
Measure the resistance of the A/C Clutch Relay Output circuit between the IPM and
the A/C Clutch harness connector.
Is the resistance below 5.0 ohms?All
Ye s®Replace the A/C Clutch Relay.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No®Replace the IPM Fused & Relay Center.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
237
DRIVEABILITY - GAS
*CHECKING THE A/C RELAY OUTPUT ÐContinued
Page 4033 of 4284

Symptom:
P0645-A/C CLUTCH RELAY CKT
When Monitored and Set Condition:
P0645-A/C CLUTCH RELAY CKT
When Monitored: With the ignition on. Battery voltage greater than 10 volts. A/C Switch
on.
Set Condition: An open or shorted condition is detected in the A/C clutch relay control
circuit.
POSSIBLE CAUSES
A/C CLUTCH RELAY INTERMITTENT OPERATION
INTERMITTENT CONDITION
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
INTELLIGENT POWER MODULE
A/C CLUTCH RELAY
IPM FUSE & RELAY CENTER
A/C CLUTCH RELAY CONTROL CKT OPEN
A/C CLUTCH RELAY CONTROL CIRCUIT SHORT TO GROUND
PCM
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, actuate the A/C Clutch Relay.
Is the A/C Clutch Relay operating?All
Ye s®Go To 2
No®Go To 4
2 Turn the ignition on.
With the DRBIIIt, actuate the A/C Clutch Relay.
Wiggle the wiring harness from the A/C Clutch Relay to the PCM while the relay is
actuating.
Did the A/C Clutch Relay stop when wiggling the wiring harness?All
Ye s®Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No®Go To 3
239
HEATING & A/C